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HomeMy WebLinkAboutSW8140906_Historical File_20171030Energy, Mineral & Land Resources ENVIRONMENTAL QUALITY October 30, 2017 State of NC through the NC Dept. of Public Safety, NC National Guard Attn: LTC Rodney Newton 1636 Gold Star Drive Raleigh, NC 27607 Subject: State Stormwater Management Permit No. SW8 140906 National Guard Readiness Center Redevelopment with Sand Filters Project New Hanover County Dear LTC Newton: ROY COOPER Governor MICHAEL S. REGAN Secretary TRACY DAVIS Director The Wilmington Regional Office received a complete, State Stormwater Management Permit Application for the subject project on August 29, 2017. Staff review of the plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000 effective January 1, 2017. We are forwarding modified Permit No. SW8 140906 dated October 30, 2017, for the construction, operation and maintenance of the stormwater control measures (SCMs), built -upon areas, as well as the stormwater collection system and/or vegetated conveyance system associated with the subject project. Please add the enclosed plan sheets to the currently permitted set. This permit shall be effective from the date of issuance until October 14, 2022 and shall be subject to the conditions and limitations as specified therein, and does not supersede any other agency permit that may be required. Please pay special attention to the permit conditions regarding the operation and maintenance of the SCMs, stormwater collection system, and/or vegetated conveyances; the limitation of built -upon area; modification of the project; the procedures for changing ownership of and/or transferring the permit; and the need to renew the permit. Please also pay attention to the permit conditions that requires the recordation of deed restrictions and protective covenants, easements, and the maintenance agreement, which must all be provided along with certification upon completion of the project. Failure to comply with these requirements will result in future compliance problems. The following modifications are included and covered by this permit: 1. October 14, 2014 Permit: This permit covered redevelopment of a portion of the 40.856ac project area. It permitted one infiltration basin. 2. August 1, 2017 Permit: a. Summary: Circumstances have required that the 2014 design be reconfigured. The modified permit will redevelop the area previously -permitted in 2014 and it will redevelop additional area, but the project area will remain 40.856ac. The project uses two sand filters for stormwater treatment. The two sand filters as well as additional area are located inside the drainage area for a dry pond. The dry pond does not receive impervious area treatment credit because .it is not a primary SCM per 15A NCAC 02H .1002(46). It provides peak flow detention as required by 15A NCAC 02H .1003(5). State of North Carolina I Environmental Quality I Energy. Mineral and Land Resources Wilmington Regional Office 1 127 Cardinal Drive Extension I Wgmington, NC 28405 910 796 7215 State Stormwater P rniit No. SW8 140906 Page 2 of 2 Redevelopment: This project. meets the two redevelopment requirements: i. Net Increase. in Impervious Area is Treated: As summarized in Section I(1) and in Table 1 of Attachment B, the project treats the net increase in impervious area as required by 15A NCAC.: 02H .I003(3)(d). ii. Equal or Better Storrnwater Control: In the 1988 pre-existing condition, stormwater was conveyed offsite via a series of pipes and channels without treatment. The system to be constructed collects a significant portion of that water for treatment. Other areas have also been disconnected so that water from impervious surfaces sheet flows over vegetated areas. 3. October 30, 2017 Permit: A fence has been added to previously -approved fencing to fully fence - in the facility. The fence posts have a negligible amount of concrete for structural support, but there has been no impact on the impervious area previously -permitted. The fence is exempted from State Stormwater permitting. See Permit Section I(10). If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing by filing a written petition with the Office of Administrative Hearings (OAH). The written petition must conform to Chapter 150B of the North Carolina General Statutes and must be filed with the OAH within thirty (30) days of receipt of this permit. You should contact the OAH with all questions regarding the filing fee (if a filing fee is required) and/or the details of the filing process at 6714 Mail Service Center, Raleigh, NC 27699-6714, or via telephone at 919-431-3000, or visit their website at www.NCOAH.com. Unless such demands are made this permit shall be final and binding. If you have any questions, or need additional information concerning this matter, please contact Kelly Johnson in the Wilmington Regional Office, at (910) 796-7215. Sincer ly, ,,,Tracy Davis, P.E., Director Division of Energy, Mineral and Land Resources Enclosures: Attachment A —Designer's Certification Form Attachment B — Built -Upon Area Allocation GDS/kpj: %StormwaterTermits & Projects12017\140906 HD12017 10 permit 140906 cc: i., e !'ill: - nnnvonn Inspector, New Hanover County But Building Inspections NCDOT District Engineer mg Wilmington Regional Office Stormwater File State of North Carolina I Environmental Quality I Energy. Mineral and Land Resources Wilmington Regional Office 1127 Cardinal Drive Extension I Wilmington, NC Z8405 910 796 7215 State Stormwater Management Permit No. SW8 140906 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF ENERGY, MINERAL AND LAND RESOURCES STATE STORIVI'IiV'ATER MANAGEMENT PERMIT REDEVELOPMENT WITH SAND FILTERS PROJECT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO State of NC through the NC Dept. of Public Safety, NC National Guard National Guard Readiness Center 2414 Infantry Road, Wilmington, New Hanover County FOR THE construction, operation and maintenance of two (2) sand filters ("stormwater control measures" or "SCMs") which have been permitted as primary SCMs per 15A NCAC 02H .1002(37). The project also contains a dry pond which is permitted as a secondary SCM, which is for hydraulic benefits and not total suspended solids removal per. 1002(46) and .1003(5). This permit is issued in compliance with the provisions of Title 15A NCAC 2H .1000 effective January 1, 2017 (the "stormwater rules") and the approved stormwater management plans, application, supplement(s), specifications, and other supporting data (the "approved plans and specifications") as attached and/or on file with and approved by the Division of Energy, Mineral and Land Resources (the "Division" or "DEMLR") and considered an enforceable part of this permit. This permit shall be effective from the date of issuance until October 14, 2022 and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS This permit is effective only with respect to the management and volume of stormwater described in the approved plans and specifications. The maximum amount of built -upon area (BUA) allowed for the entire project is summarized in Attachment B, Tables 1 and 2. The total allocated impervious area is 267,530 square feet to be constructed on the site. The dry pond does not receive impervious area treatment credit because it is not a primary SCM per 15A NCAC 02H .1002(46). The dry pond provides peak flow detention as required by 15A NCAC 02H .1003(5). As shown in Attachment B Table 2, the dry pond is able to accommodate an additional 54,450 square feet of future impervious area via a future permit modification (if the 54,450 square feet is also treated by a primary SCM). Therefore, the total impervious area is 321,980 square feet (which is equal to the 267,530 square feet allocated plus the potential 54,450 square feet of future impervious.) Additionally, there was 181,038sf of impervious area in place prior to 1988 as demonstrated on the permitted plans an in Attachment B Table 1. Since the total allocated impervious area for the project is 267,530sf the project must treat at least (267,530sf-181,038sf=) 86,492sf of impervious area. As shown in Attachment B Table 1, the project provides two sand filters which treat 63,162sf and 61,855sf (total= 125,01 7sf). Therefore, this project meets the 15A NCAC 02H .1003(3)(d) requirement. Page 1 of 5 State Stormwater Management Permit No. SW8 140906 2. The drainage areas for the on -site stormwater systems will be limited to the amounts of built - upon area indicated in this permit and the approved plans and specifications. The runoff from all built -upon area within the permitted drainage areas of this project must be directed into the permitted stormwater control measures. The stormwater control measures labeled Sand Filter 1 and Sand Filter 2 have been designed using the runoff treatment method to handle the runoff from 63,162 and 61,855 square feet of built -upon area, respectively. This permit does not provide any allocation of built -upon area for future development in the drainage area of either sand filter 3. A 50-foot wide vegetative setback must be provided and maintained adjacent to all surface waters, measured horizontally from the normal pool elevation of impounded structures, from the top of bank of each side of streams or rivers, and from the mean high waterline of tidal waters, perpendicular to the shoreline in accordance with the stormwater rules and the approved plans and specifications. 4. The stormwater control measure(s) is(are) permitted based on the design criteria presented in the sealed, signed and dated supplement and as shown in the approved plans and specifications. These stormwater control measures must be provided and maintained at the design condition. The approved supplement is incorporated by reference into this permit. 5. The peak flow from the 10-year storm event shall not cause erosion downslope of the stormwater outlet discharge point. 6. The sand filter shall be maintained in a manner that results in a drawdown of at least two inches per hour at that sand surface. 7. The fence posts permitted on October 30, 2017 have a negligible amount of concrete for structural support, but there has been no impact on the impervious area previously -permitted. The fence is exempted from State Stormwater permitting. II. SCHEDULE OF COMPLIANCE The project shall be constructed in accordance with the conditions of this permit and the approved plans and specifications. 2. The on -site stormwater system shall be entirely constructed, vegetated, and operational prior to the construction of any development, per the approved plans and specifications. 3. During construction, erosion shall be kept to a minimum and any eroded areas of the on -site stormwater system will be repaired immediately. If the stormwater system is used as an Erosion Control device, it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility. 4. All stormwater control measures, stormwater collection systems vegetated conveyance systems, and/or maintenance accesses must be located in public rights -of -way, dedicated common areas that extend to the nearest public right-of-way, and/or permanent recorded easements that extend to the nearest public right-of-way for the purpose of inspection, operation, maintenance, and repair. 5. The permittee shall at all times provide and perform the operation and maintenance necessary, as listed in the signed Operation and Maintenance Agreement, to assure that all components of the permitted on -site stormwater system functions at the approved design condition. The approved Operation and Maintenance Agreement is incorporated by reference into this permit and must be followed in its entirety and maintenance must occur at the scheduled intervals. 6. The operation and maintenance agreement must be recorded with the Office of the Register of Deeds. 7. Records of maintenance activities must be kept and made available upon request to authorized personnel of the Division. The records will indicate the date, activity, name of person performing the work and what actions were taken. Page 2 of 5 State Stormwater Management Permit No. SW8 140906 8. The final plats for the project must be recorded with the Office of the Register of Deeds. The recorded plat must reference the Operation and Maintenance Agreement and must also show all public rights -of -way, dedicated common areas; and/or permanent drainage easements, in accordance with the approved plans. 9. The permittee is responsible for verifying that the proposed built -upon area for the entire project does not exceed the maximum allowed by this permit. 10. Upon completion of the project, the permittee shall determine whether or not the project is in compliance with the permitted plans and take the necessary following actions: a. If the permittee determines that the project is in compliance with the permitted plans, then within 45 days of completion, the permittee shall submit to the Division one hard copy and one electronic copy of the following: i. The completed and signed Designer's Certification provided in Attachment A noting any deviations from the approved plans and specifications. Deviations may require approval from the Division; ii. A copy of the recorded maintenance agreement; iii. Unless already provided, a copy of the recorded deed restrictions and protective covenants; and iv. A copy of the recorded plat delineating the public rights -of -way, dedicated common areas and/or permanent recorded easements, when applicable. b. If the permittee determines that the project is not in compliance with the permitted plans, the permittee shall submit an application to modify the permit within 30 days of completion of the project or provide a plan of action, with a timeline, to bring the site into compliance. 11 No person or entity, including the permittee, shall alter any component shown in the approved plans and specifications. Prior to the construction of any modification to the approved plans, the permittee shall submit to the Director, and shall have received approval for modified plans, specifications, and calculations including, but not limited to, those listed below: a. Any modification to the approved plans and specifications, regardless of size including the stormwater control measures, built -upon area, details, etc. b. Redesign or addition to the approved amount of built -upon area or to the drainage area. c. Further development, subdivision, acquisition, lease or sale of any, all or part of the project area as reported in the approved plans and specifications. d. Altering, modifying, removing, relocating, redirecting, or resizing of any component of the approved stormwater control measure, stormwater collection system and/or vegetative conveyance system shown on the approved plan. e. The construction of any allocated future BUA. f. The construction of any permeable pavement for BUA credit that was not included in the approved plans and specifications. The request must include a soils report identifying the type of soil, the Seasonal High Water Table elevation and the infiltration rate. g. The construction of any 57 stone area or trails to be considered a permeable surface that were not included in the approved plans and specifications. h. Other modifications as determined by the Director. 12. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of modified plans and certification in writing to the Director that the changes have been made. 13. Prior to transfer of the permit, a file review and site inspection will be conducted by Division personnel to ensure the permit conditions have been met and that the project and the on -site stormwater system is in compliance with all permit conditions. Any items not in compliance must be repaired, replaced restored, or resolved prior to the transfer. Records of maintenance activities performed to date may be requested. III. GENERAL CONDITIONS Any individual or entity found to be in noncompliance with the provisions of a stormwater management permit or the requirements of the stormwater rules is subject to enforcement procedures as set forth in NCGS 143 Article 21. Page 3 of 5 State Stormwater Management Permit No. SW8 140906 2. The issuance of this permit does not preclude the permittee from complying with and obtaining any and all other permits or approvals that are required in order for this development to take place, as required by any statutes, rules, regulations, or ordinances, which may be imposed by any other Local, State or Federal government agency having jurisdiction. Any activities undertaken at this site that cause a water quality violation or undertaken prior to receipt of the necessary permits or approvals to do so are considered violations of NCGS 143-215.1, and subject to enforcement procedures pursuant to NCGS 143-215.6. 3. In the event that the facilities fail to perform satisfactorily, the permittee shall take immediate corrective actions. This includes actions required by this Division and the stormwater rules such as the construction of additional or replacement on -site stormwater systems. These additional or replacement measures shall receive a permit from the Division prior to construction. 4. This permit is not transferable to any person or entity except after notice to and approval by the Director. The permittee shall submit a completed and signed State Stormwater Request Form for Permit Transfer or Permit Information Update, accompanied by the supporting documentation as listed on the form, to the Division at least 60 days prior to any one or more of the following events: a. An ownership change including the sale or conveyance of the project area in whole or in part, except in the case of an individual lot sale that is made subject to the recorded deed restrictions and protective covenants; b. Bankruptcy; c. Foreclosure, subject to the requirements of Session Law 2013-121, d. Dissolution of the partnership or corporate entity, subject to NCGS 57D-2-01(e) and NCGS 57D-6-07; e. A name change of the current permittee; f. A name change of the project; g. A mailing address change of the permittee; 5. The permittee is responsible for compliance with all of these terms and conditions until such time as the Division approves the transfer request. Neither the sale of the project, in whole or in part, nor the conveyance of common area to a third party constitutes an approved transfer of the permit. 6. The permittee grants Division Staff permission to enter the property during normal business hours for the purpose of inspecting all components of the permitted project. 7. The permit issued shall continue in force and effect until the permittee files a request with the Division for a permit modification, transfer, renewal, or rescission; however, these actions do not stay any permit conditions. 8. Approved plans, application, supplements, calculations, operation and maintenance agreement, and specifications for this project are incorporated by reference and are enforceable parts of the permit. A copy of this permit, application, supplements, operation and maintenance agreement, and approved plans and specifications shall be maintained on file by the permittee at all times. 9. Unless specified elsewhere, permanent seeding requirements for the on -site stormwater system must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. 10. The issuance of this permit does not prohibit the Director from reopening and modifying the permit, revoking and reissuing the permit, or terminating the permit for cause as allowed by the laws, rules, and regulations contained in Title 15A NCAC 2H.1000 and NCGS 143-215.1 et.al. 11. A permit renewal request must be submitted at least 180 days prior to the expiration date of this permit. The renewal request must include the appropriate application, documentation and the processing fee as outlined in Title 15A NCAC 02H.1045(3). Page 4 of 5 State Stormwater Management Permit No. SW8 140906 Permit modified and reissued this the 30th day of October 2017 NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION ray avis . E., Director Division of Energy, Mineral and Land Resources By Authority of the Environmental Management Commission Permit Number SW8 140906 Page 5 of 5 State Stormwater Management Permit No. SW8 140906 Attachment A: Designer's Certification Form National Guard Readiness Center Stormwaler Permit No. SW8 140906 New Hanover County Designer's Certification I, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the project, (Project) for (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is a part of this Certification. Noted deviations from approved plans and specifications: Signature Registration Number Date SEAL cc: NCDEQ-DEMLR Regional Office Inspector, New Hanover County Building Inspections Page 1 of 2 State Stormwater Management Permit No. SW8 140906 General Certification Requirements: Sand Filters Y 1. The drainage area to the system contains approximately the permitted acreage. 2. The drainage area to the system contains no more than the permitted amount of built - upon area. 3. All the built -upon area associated with the project is graded such that the runoff drains to the system. 4. All roof drains are located such that the runoff is directed into the system. 5. The inlets are located per the approved plans and do not cause short-circuiting of the system. 6. The permitted amounts of surface area and/or volume have been provided. 7. All required design depths are provided. 8. All required parts of the system are provided. 9. The required dimensions of the system are provided, per the approved plan. 10. All components of the stormwater control measure are located in either recorded common areas; or recorded easements. Page 2 of 2 State Stormwater Management Permit No. SW8 140906 Attachment B: Data Summary Tables Table 1 SW8140906 - National Guard Readiness Center Redevelopment Summary Impervious Area Treated: Sand Filter #1: 125,017 �63,162 Filter #2: 61,855 _Sand _ Impervious Required to Treat =267,530 3�1,038siJ 86,492 July 21, 2017, Impervious Total: 267,530 ?re-1988 Impervious Remaining 121,414 New Impervious 146,116 Pre-1988 Impervious Total: 181,038 ;per 15A NCAC 02H .1003(31(d) ..................... _. Attachment B Table 2 SW8140906 - National Guard Readiness Center Impervious Area Summary Inside Dry Pond DA Outside Dry Pond DA Total Project Area' Sand Filter #1 Sand To Dry Pond, Filter #2 but not to Sand Filters Dry on Total, Total Project Area/Drainage Area" 67,082 84,936 127,647 279,665 1,500,022 1,779,6871 40.856 f 1.540 1.950 2.930 6.420 34.436 Onsite Drainage Area 67,082 84,936 127,647 279,665 11,500,022 1,779,6971 Offske Drainage Area 0 0 0 0 0 01 Impervious Area Totals �.� 63,162 _ 61X51 73,181 198,198 1231782 321,9801 Allocated Impervious- 63,162 61,855 18,731 143,748 - 123,7821 _ 267,5301 Onsite Buildings 35,719 0 0 35,719 - 35,719 1 Onsite Streets 0 0 1,578 1,578 1,5781 Onsite Parking 27,443 61,855 89,298 14,006 103,3041 Onsite Sidewalks 0 01 _0 1,457 1,457 4,058 5,515 1 Other Onsite 0 0 0 0 - - 1 Offsite Drainage Area 0 0 0 0 - - 1 Existing BUA 0 0 15,696 15,696 105,718 121,41411 Future Impervious Available Via Permit Modification: 01 0 54,450 54,450 01 54,45011 'The dry pond treats water draining from two sand filters as viell as additional area. The dry pond has been designed to accommodate an additional 54,450ft2 of impervious that can be permitted in the future. However, since the dry ,pond is a secondary SCM the 54,450ft2 will have to also be treated by a primary SCM. z The total property area is 41.29ac. There are 0.434ac of coastal wetlands, and so the project area is 40.856ac. he receiving stream is UT to Smith Creek. The stream index is 18-74-63. The stream classification is C; SW. Page 1 of 1 Johnson, Kelly From: Frank Slinsky <Frank.Slinsky@timmons.com> Sent: Tuesday, August 29, 2017 11:33 AM To: Johnson, Kelly; Brandon McLamb Cc: Scott, Georgette Subject: RE: NCNG Readiness Center - Draft Security Fence Flan Thank you! The fence doesn't coo all around the entire site; but rather just around a portion of the site where there is no security fence to meet Antiterrorism standards. It just closes the gap and connects up to the existing fence. Sincerely, Frank Slinsky, PE, LEED AP Senior Project Manager TIMMONS GROUP I www.timmons.com 5410 Trinity Road, Suite 102 Raleigh, NC 27607 Office: 919.866.45051 Fax: 919.859.5663 Mobile: 919.830.8458 1 frank.slinskyCatimmons.com Your Vision Achieved Through Ours To send files greater than 20MB click here From: Johnson, Kelly [mailto:kelly.p.johnson@ncdenr.gov] Sent: Tuesday, August 29, 2017 11:29 AM To: Frank Slinsky <Frank.Slinsky@timmons.com>; Brandon McLamb <Brandon.McLamb@timmons.com> Cc: Scott, Georgette <georgette.scott@ncdenr.gov> Subject: RE: NCNG Readiness Center - Draft Security Fence Plan Actually, I see below that we have already agreed to do this as an exemption associated with SW8140906 rather than a minor mod. (It should have been a minor mod. But, we will proceed as an exemption if that is what was already said.) But, I am still confused by exactly what is being proposed. Is the fence you are looking to install intended to go around the whole 41.29ac site? Thanks Kelly From: Johnson, Kelly Sent: Tuesday, August 29, 2017 11:21 AM To:'Frank Slinsky' <Frank.Slinsk timmons.com>; Brandon McLamb <Brandon.McLamb@timmons.com> Cc: Georgette Scott <georgette.scott@ncdenr.eov> . Subject: RE: NCNG Readiness Center - Draft Security Fence Plan Frank & Brandon, We received this application, and I want to make sure that we are on the same page. It was submitted as an Exemption, but I think it is a minor modification to an existing permit. The existing permit for the NCNG Project, SW8 140906, covers the entire 41.29ac site owned by NCNG. The most recent permit action for the readiness center altered a small portion of that 41.29ac, but the readiness center's footprint is not the footprint of the entire project area for the permit. Below, I have overlaid the readiness center with county GIS's property lines for the 41.29ac site. It looks like your request is to put a fence (which does not have a concrete footer) all the way around the property, just inside the property line. If so, then this is a minor modification to SW8 140906 and not a stand-alone exemption. Please advise. Thanks, Kelly From: Frank Slinsky [mailto:Frank..Slinsk timmen5 ,com] Sent: Wednesday, August 23, 2017 10:41 AM To: Johnson, Kelly <keilypJohnson@ncdenrgov@ncdenrgov>; Brandon McLamb <Brandon.McLa:nb@timmons.com> Subject: RE: NCNG Readiness Center - Draft Security Fence Plan ...also to answer your question, this fence is not within the footprint of the Readiness Center project, the fence goes around the perimeter of the site. Thanks again. Sincerely, Frank Slinsky, PE, LEED AP Senior Project Manager TIMMONS GROUP I www.timmons.com 5410 Trinity Road, Suite 102 Raleigh, NC 27607 Office: 919.866.45051 Fax: 919.859.5663 Mobile: 919.830.8458 1 frank.slinsky�timmons.com Your Vision Achieved Through Ours To send files greater than 20MB click here 2 From: Frank Slinsky Sent: Wednesday, August 23, 2017 10:33 AM To:'Johnson, Kelly' <kelly.p.iohnson@ncdenr.gov>; Brandon McLamb <Brandon.McLamb@timmons.corn> Subject: RE: NCNG Readiness Center - Draft Security Fence Plan Kelly, This is the security fence project I sent you PDF's to review a couple weeks and you discussed it being exempt from stormwater review since there is no new impervious being added. We also discussed it is separate and standalone from the readiness center project due to funding. We mailed you the drawings yesterday for exemption per your instructions in the emai;s below. it % gill be bid out tt:ls Thursday and construction will be complete prior to starting the Readiness Center project. Sorry about the confusion again as Brandon wasn't exactly sure of the background. Please feei free to ca!I me if YOU have any questions and thank you again for your assistance. Thank you. Sincerely, Frank Slinsky, PE, LEED AP Senior Project Manager TIMMONS GROUP I www.timmons.com 5410 Trinity Road, Suite 102 Raleigh, NC 27607 Office: 919.866.45051 Fax: 919.859.5663 Mobile: 919.830.8458 1 frank.slinsky(cD-timmons.com Your Vision Achieved Through Ours To send files greater than 20MB click here From: Johnson, Kelly[mailto:kellv.p.lohnson@ncdenr.gov] Sent: Wednesday, August 23, 2017 9:43 AM To: Brandon McLamb <Brandon.McLamb@timmons.com> Cc: Frank Slinsky <Frank.Slinskv@timmons.com> Subject: Re: NCNG Readiness Center - Draft Security Fence Plan Brandon, I'm not in the office today, and so I don't have the file in front of me. But, I thought that the fence was supposed to be inside the project area for the National Guard project. Is that not the case? Thanks, Kelly From: Brandon McLamb <Brandon.McLamb@timmons.com> Sent: Tuesday, August 22, 2017 4:48:40 PM To: Johnson, Kelly Cc: Frank Slinsky Subject: RE: NCNG Readiness Center Draft Security Fence Plan Kelly, I was new to this one so I was mistaken about it being tied in with permit number S@8140906. This is a standalone and we are just not adding any impervious to the project so we would like an approval based on stormwater exemption as soon as we can get it. Thanks and sorry for the confusion! Brandon From: Brandon McLamb Sent: Tuesday, August 22, 2017 4:01 PM To:'kelly.p.johnson@ncdenr.gov' <ke_lv_p1ohnson@ncdenr.gov> Cc: Frank Slinsky <Frank.Slinsky(@tiP.)mcns.com> Subject: RE: NCNG Readiness Center - Draft Security Fence Plan Kelly, Attached are plans for the NCNG Wilmington New Hanover — Security Fence Replacement. We are including this plan set showing no proposed impervious as we apply forthe exemption for stormwater. This is in reference to permit number SW8 140906. See correspondence below for history on this project. I have 2 hard copies of the attached pdf coming your way via mail. If you have any questions or would like to discuss please give me a call. I believe that some of the National Guard funding for this may be expiring in September so it is my understanding that there is a push to get this ironed out as quickly as possible, so anything I can do to help please let me know. Thanks in advance! Brandon McLamb, PE Project Manager TIMMONS GROUP I www.timmons.com 5410 Trinity Rd, Suite 102 1 Raleigh, NC 27607 Office: 919.866.49351 Fax: 919.859.5663 brand on. mclambO.tim mons. corn Your Vision Achieved Through Ours To send me files greater than 20MB click here. From: Johnson, Kelly [mailtc:kelly.p.iohnson ncdenr. ov] Sent: Tuesday, August 08, 2017 10:19 AM To: Frank Slinsky <Frank.Slinsky@timmons.com> Subject: RE: NCNG Readiness Center - Draft Security Fence Plan Yes, you can apply for the exemption for the fence without new impervious area. I was not in the office on Friday. Did you get what you needed for the plans? We do not have a copy machine that copies large sheets. When people come to the office to review files, Cameron Weaver usually goes with them to a local print shop to have copies made. From: Frank Slinsky[mailto:Frank.Slinsky@timmons.com] Sent: Thursday, August 03, 2017 12:21 AM To: Johnson, Kelly <kelly.p.iohnson@ncdenr.gov> Subject: RE: NCNG Readiness Center - Draft Security Fence Plan I just received this from the Nationat Guard. I guess we are ok to submit the fence plan for the exemption now? No new impervious is on the plans. 4 I would also like to get a full copy of the stormwater review package, including any maps, that were eventually approved for permit. Can I make a copy from your final review set or do I need to get that from the owner or engineer (Jacobs)? I will be in the DEQ office this Friday at 10-am for the Erosion Control Express review meeting if you can provide me a copy. Thank you. Sincerely, Frank Slinsky, PE, LEED AP Senior Project Manager TIMMONS GROUP I www.timmons.com 5410 Trinity Road, Suite 102 Raleigh, NC 27607 Office: 919.866.45051 Fax: 919.859.5663 Mobile: 919.830.8458 1 frank.slinsky0timmons.com Your Vision Achieved Through Ours To send files greater than 20MB click here From: Johnson, Kelly [mailto:ke!ly.p.!ohnson@ncdenr.gov] Sent: Thursday, July 20, 2017 11:11 AM To: Frank Slinsky <Frank.Slinskv@timmons.com> Subject: RE: NCNG Readiness Center- Draft Security Fence Plan OK. Just FYI, it can't be formally accepted until after the permit issued for the Readiness Center. But, it shouldn't be long on that. KJ From: Frank Slinsky [mailto:Frank.Slinsky@timrnons.coml Sent: Thursday, July 20, 201711:09 AM To: Johnson, Kelly <kelly.p.iohnson@ncdenr.gov> Subject: RE: NCNG Readiness Center- Draft Security Fence Plan That's great, thank you. We'll mail out in the next day or so and you will receive it next week. Sincerely, Frank Slinsky, PE, LEED AP Senior Project Manager TIMMONS GROUP I www.timmons.com 5410 Trinity Road, Suite 102 Raleigh, NC 27607 Office: 919.866.45051 Fax: 919.859.5663 Mobile: 919.830.8458 1 frank.slinsky@timmons.com Your Vision Achieved Through Ours To send files greater than 20MB click here From: Johnson, Kelly [mailto:kelly.p.iohnson@ncdenr.gov] Sent: Thursday, July 20, 2017 11:06 AM To: Frank Slinsky <Frank.Slinsky@timmons.com> Subject: RE: NCNG Readiness Center - Draft Security Fence Plan Frank, Yes, the 2ft strip over the length of the fence would likely add up. If you do not have the strip, then you can just apply for an Exemption. All you need is a cover letter, your narrative, and two sets of supporting plans. There is no fee. Just submit it to: Attn: Kelly Johnson DEMLR 127 Cardinal Drive Extension Wilmington, NC 28405 Please reference permit number SW8 140906 in your cover letter. Thanks, Kelly From: Frank Slinsky [mailto:Frank.Slins v timmons.com] Sent: Thursday, July 20, 2017 10:58 AM To: Johnson, Kelly <kelly.p.lohnson@ncdenr.gov> Subject: RE: NCNG Readiness Center - Draft Security Fence Plan Oh, you are probably referring to the narrative. The narrative says no new impervious but the drawing shows the concrete strip. We were anticipating needing to remove that strip from the plans to avoid stormwater regulations and can do that if simplifies matters.. Sincerely, Frank Slinsky, PE, LEED AP Senior Project Manager TIMMONS GROUP I www.timmons.com 5410 Trinity Road, Suite 102 Raleigh, NC 27607 Office: 919.866.45051 Fax: 919.859.5663 Mobile: 919.830.8458 1 frank. slinsky0timmons.com Your Vision Achieved Through Ours To send files greater than 20MB click here From: Johnson, Kelly (mailto:kelly.p.iohnson@ncdenr.gov] Sent: Thursday, July 26, 2017 10:46 AM To: Frank Slinsky <Frank.Slinsky@timmons.com> Subject: RE: NCNG Readiness Center - Draft Security Fence Plan Frank, It looks like there is a 2ft wide concrete strip underneath the fence, but it also says that there is no impervious? Can you clarify? Thanks, Kelly From: Frank Slinsky[mailto:Frank.SlinskyLi)timmons.corr] Sent: Thursday, July 20, 2017 10:08 AM To: Johnson, Kelly <kelly.o.[,ohnson DricdR-rn.gov> Subject: NCNG Readiness Center - Draft Security Fence Plan Kelly, Attached is a draft of the plans and narrative for the security fence project proposed at the NCNG readiness center site in Wilmington. The scope of project entails approximately 4,500-If of chain link and ornamental security fence with gates and tree clearing and erosion control to install the fence. There are no proposed structures or impervious surfaces, but typically the NCNG likes to install a 2-ft strip of concrete under the fence to avoid weed whacking (see details). If the concrete strip would trigger additional stormwater reviews with the potential to increase the size of the SCM's proposed with the Readiness Center, we will remove the concrete strip from the details and not construct that strip. Please advise the quickest way for us to comply with Stormwater regulation. It's preferred to build the fence in the next 2 months, prior to the Readiness Center construction if possible. Is there a stormwater exemption if we just build the fence? Would the concrete strip trigger a stormwater review with the potential to require Stormwater treatment? Fyi, we requested an Express Erosion Control review but need to send Cameron some additional materials. Thank you! Sincerely, Frank Slinsky, PE, LEED AP Senior Project Manager TIMMONS GROUP I www.timmons.com 5410 Trinity Road, Suite 102 Raleigh, NC 27607 Office: 919.866.45051 Fax: 919.859.5663 Mobile: 919.830.8458 1 frank.slinsky0timmons.com Your Vision Achieved Through Ours To send files greater than 20MB click here TIMh1ONS GROUP YOUR VISION ACFIIEVEI] rlikoUiaH OURS. 5410 Trinity Road P 919.866.4951 Suite 102 F 919.859.5663 Raleigh, NC 27607 www.timnwns.com TRANSMITTAL, NCDEQ - Wilmington Office Date: 8122/17 Job#: 40048 TO: Erosion Control Express Review Project: NCNG Wilmington New Hanover - Security Fene 127 Cardinal Drive Ext. Reference: Stormwater Exemption Submittal Wilmington, NC 28405 Attention: Kelly Johnson COPIES DATE NUMBER DESCRIPTION 2 08/22/17 1 Two 2 Sets of Plans 1 08/22/17 2 Copy of Previous Email Correspondence 1 rICAC I I CIVIA /iRC i rC/11VJIVII 1 1 CU: If enclosures are not as noted, please notify us at once. COMMENTS: Kelly, Enclosed are 2 sets of plans for the NCNG Wilmington New Hanover- Security Fence Replacement plan that we are including as we apply for the exemption for stormwater since we are not adding impervious as part of the site plan. ii you couid review and please iet us know if you need anything further in order to push this permit through it would be greatly appreciated. Thank You, "-�z Z, -��& ECEIVE 1310.4004 McCAvtfo Foy AUG 2 4 2011 Frank Slinsky, P.E. f3Y CIVIL ENGINEERING I ENVIRONMENTAL I SURVEYING I GIS I LANDSCAPE ARCHITECTURE I CONSTRUCTION SERVICES Johnson, Kelly From: Johnson, Kelly Sent: Thursday, July 20, 2017 11:06 AM To: 'Frank Slinsky' Subject: RE: NCNG Readiness Center - Draft Security Fence Plan Frank, Yes, the 2ft strip over the length of the fence would likely add up. If you do not have the strip, then you can just apply for an Exemption. All you need is a cover letter, your narrative, and two sets of supporting plans. There is no fee. Just submit it to: Attn: Kelly Johnson DEMLR 127 Cardinal Drive Extension Wilmington, NC 28405 Please reference permit number SW8 140906 in your cover letter. Thanks, Kelly From: Frank Slinsky [mailto:Frank.Slinsky@timmons.com] Sent: Thursday, July 20, 201710:58 AM To: Johnson, Kelly <kelly.p.johnson@ncdenr.gov> Subject: RE: NCNG Readiness Center- Draft Security Fence Plan Oh, you are probably referring to the narrative. The narrative says no new impervious but the drawing shows the concrete strip. We were anticipating needing to remove that strip from the plans to avoid stormwater regulations and can do that if simplifies matters.. Sincerely, Frank Slinsky, PE, LEED AP Senior Project Manager TIMMONS GROUP I www.timmons.com 5410 Trinity Road, Suite 102 Raleigh, NC 27607 Office: 919.866.45051 Fax: 919.859.5663 Mobile: 919.830.8458 1 frank. slinsky0tim mons.com Your Vision Achieved Through Ours To send files greater than 20MB click here From: Johnson, Kelly [mailto:kelly.p.iohnson@ncdenr.eov] Sent: Thursday, July 20, 2017 10:46 AM To: Frank Slinsky <Frank.Slinsky@timmons.com> Subject: RE: NCNG Readiness Center- Draft Security Fence Plan Frank, It looks like there is a 2ft wide concrete strip underneath the fence, but it also says that there is no impervious? Can you clarify? Thanks, Kelly From: Frank Slinsky[mailto:Franl<.Slinskv@timinons.com] Sent: Thursday, July 20, 2017 10:08 AM To: Johnson, Kelly <kelly.p.iohnson@ncdenr.gov> Subject: NCNG Readiness Center - Draft Security Fence Plan Kelly, Attached is a draft of the plans and narrative for the security fence project proposed at the NCNG readiness center site in Wilmington. The scope of project entails approximately 4,500-If of chain link and ornamental security fence with gates and tree clearing and erosion control to 'install the fence. There are no proposed structures or impervious surfaces, but typically the NCNG likes to install a 2-ft strip of concrete under the fence to avoid weed whacking (see details). If the concrete strip would trigger additional stormwater reviews with the potential to increase the size of the SCM's proposed with the Readiness Center, we will remove the concrete strip from the details and not construct that strip. Please advise the quickest way for us to comply with Stormwater regulation. It's preferred to build the fence in the next 2 months, prior to the Readiness Center construction if possible. Is there a stormwater exemption if we just build the fence? Would the concrete strip trigger a stormwater review with the potential to require Stormwater treatment? Fyi, we requested an Express Erosion Control review but need to send Cameron some additional materials. Thank you! Sincerely, Frank Slinsky, PE, LEED AP Senior Project Manager TIMMONS GROUP I www.timmons.com 5410 Trinity Road, Suite 102 Raleigh, NC 27607 Office: 919.866.45051 Fax: 919.859.5663 Mobile: 919.830.8458 1 frank.slinsky(ccDtimmons.com Your Vision Achieved Through Ours To send files greater than 20MB click here Johnson, Kell From: Johnson, Kelly Sent: Monday, July 10, 2017 12:20 PM To: 'Gollings, Jamie E.' Cc: Weaver, Cameron Subject: RE: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review Jamie, I overlaid the county GIS with the plan you sent me this morning in the first diagram below. The current (2014) permit covers the entire tract that the National Guard owns, as shown by the land inside the green line "below" Control Tower Drive. (Just to clarify, I want to make sure that you understand that that whole project area will need to be re -permitted in tomorrow's application. You probably already realize that, but I just want to make sure since I don't see the project area on the plan from this morning.) I then overlaid the drainage area for the infiltration basin that was permitted in 2014 in diagram 2 (it isn't a perfect overlay, but you get the idea.) From the file, it looks like the area that is covered mainly by proposed sand filter #2 (the DA on the left in diagram 1) is constructed per the 2014 plans because the infiltration basin is certified. It looks like you all plan to reconfigure that area, take out the infiltration basin, and use a sand filter. The area that goes to sand filter #1 is being redeveloped from area that was not previously permitted to be redeveloped. Diagram 3 is on file from the 2014 permit. It shows the impervious area that was in place in 1981. (State Stormwater permitting began in 1988, and so the 2014 engineer submitted that to establish that he didn't have to treat all of the impervious area on the tract.) In 2014, the engineer showed that his drainage area contained impervious area that was in place well before 1988, but since it drained to the infiltration basin he treated all of the impervious area in the basin. (As I am sure you know, that is because all impervious in a drainage area has to be accounted for in order to ensure that it can all "fit" in the treatment facility). There was a small section of impervious area, as shown in Diagram 4, that he could not collect (likely because the driveway had to meet the crown of an existing road.) In retrospect, I probably should have quantified that amount of impervious in the permit. But, I did not (probably because it was so small). I have been trying to figure out the best way to document the redevelopment of this site, especially since they have been (and may continue to) make regular changes to the permit. Per .1002(41) and GS143-214.7, redevelopment must have impervious that is equal or less than the previous project and provide equal or better stormwater treatment. If the footprint of impervious is being increased, then the project falls under .1003(3)(d) and it needs a hieh-densitv nermit for the net increase of impervious area. I have talked with other staff here to determine the best way to go about this. There are at least two ways, but there may be others. The most complete method would be to quantify the impervious area inside the entire project area using a pre-1988 map. Then, demonstrate that permit modifications do not exceed that amount, and that they provide equal or better treatment of impervious area. Or, the other way to do this is to compare pre-1988 with the proposed design on a drainage -area basis without addressing the entire site. We will have to work this out tomorrow. Thanks, Kelly Diagram 1 � ■ 1 r• � f Jrf +wi r�r Otir� 1 � r i . ••t r. ww,r 1300 Diagram 2 Ulmer] Diagram 3 2 �f•Y4 O I• �JI� Diagram 4 Imt��ea mess MrAer Renovat on North Carotins Natiolrsf Guard i -----Original Message ----- From: Gollings, Jamie E. [mailto:Jamie.Gollings@jacobs.com] Sent: Monday, July 10, 2017 9:40 AM To: Johnson, Kelly <kelly.p.johnson@ncdenr.gov> 3 Cc: Weaver, Cameron <cameron.weaver@ncdenr.gov> Subject: RE: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review Kelly, Please call me when you have a moment. In the mean time, the attached shows existing vs. proposed impervious impacts. I don't believe that the existing permit involved any existing impervious impacts. Yes, the sand filters will be designed to the 2017 manual. Jamie E. Gollings, PE I Civil Engineer JACOBS Office: 111 Corning Road, Suite 200, Cary, NC 27518 Contact: Offi ce:919.859.5752 jamie.gollings@jacobs.com I www.jacobs.com -----Original Message ----- From: Johnson, Kelly [mailto:kelly.p.johnson@ncdenr.gov] Sent: Friday, July 07, 201712:56 PM To: Gollings, Jamie E. <Jamie.Gollings@jacobs.com> Cc: Weaver, Cameron <cameron.weaver@ncdenr.gov> Subject: FW: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review Jamie, I am just trying to make sure I understand what is being proposed. Have you designed the new sand filter per the new regulations (the 2017 rule)? Also, is this just a standard high density permit, or is there a redevelopment component, too? (I just looked quickly at the current permit, and I didn't see any redevelopment but I wanted to verify that.) Thanks, Kelly -----Original Message ----- From: Weaver, Cameron Sent: Friday, July 07, 201712:26 PM To: Moody, Cale D LTC USARMY NG NCARNG (US) <cale.d.moody.mil@mail.mil> Cc: Dudick, Vickie A NFG NG NCARNG (US) <vickie.a.dudick.nfg@mail.mil>; Scott, Georgette <georgette.scott@ncdenr.gov>; Johnson, Kelly <kelly.p.johnson@ncdenr.gov>; Newton, Rodney D LTC USARMY NG NCARNG (US) <rodney.d.newton.mil@mail.mil>; Caldwell, Kent Eric MAJ USARMY NG NCARNG (US) <kent.e.caldwell.mil@mail.mil>; Burriola, William S II CW2 USARMY NG NCARNG (US) <william.s.burriola.mil@mail.mil>; Harper, William W II MAJ USARMY NG NGB ARNG (US) <william.w.harper6.mil @mail.mil>; Garcia, Karla M CIV NG NGB (US) <karla.m.garcia4.civ@mail.mil>; Meilinger, Derek T MAJ USARMY NG NCARNG (US) <derek.t.meilinger.mil@mail.mil> Subject: RE: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review Thanks to Kelly (and I know I owe you!), I have been able to schedule this review as was requested for Tuesday 7/11, at 10am. We look forward to seeing the engineer and owner representative here for this meeting. Let me know of any outstanding issues. Cameron 4 Cameron Weaver Environmental Assistance Coordinator -Wilmington Regional Office NCDEQ-Division of Environmental Assistance and Customer Service 127 Cardinal Drive Ext, Wilmington, NC 28405 910-796-7303 NCDEQ NEW WEBSITE: http://deq.nc.gov/ DEACS NEW WEBSITE: http://deq.nc.gov/about/divisions/environmental-assistance-customer-service E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. ----=Original Message ----- From: Moody, Cale D LTC USARMY NG NCARNG (US)[mailto:cale.d.moody.mil@mail.mil] Sent: Friday, July 07, 201712:15 PM To: Weaver, Cameron <cameron.weaver@ncdenr.gov> Cc: Dudick, Vickie A NFG NG NCARNG (US) <vickie.a.dudick.nfg@ mail. mil>; Scott, Georgette <georgette.scott@ncdenr.gov>; Johnson, Kelly <kelly.p.johnson@ncdenr.gov>; Newton, Rodney D LTC USARMY NG NCARNG (US) <rodney.d.newton.mil@mail.mil>; Caldwell, Kent Eric MAJ USARMY NG NCARNG (US) <kent.e.caldwell.mil@mail.mil>; Burriola, William S II CW2 USARMY NG NCARNG (US) <william.s.burriola.mil@mail.mil>; Harper, William W II MAJ USARMY NG NGB ARNG (US)<william.w.harper6.mil@mail.mil>; Garcia, Karla M CIV NG NGB (US) <karla.m.garcia4.civ@mail.mil>; Meilinger, Derek T MAJ USARMY NG NCARNG (US) <derek.t.meilinger.mil@mail.mil> Subject: RE: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review Cameron, Thank you very much! We appreciate every effort to move up the review date. Normally we would not request this but we are receiving FY13 funds ($15M) for the construction of a new National Guard Readiness Center to be constructed on the same land as the current which was damaged by Act of Nature (Hurricane Irene 2011). Due to this being FY13 funds, they must be awarded by 30SEP2017 or they expire and the project will not happen. The timeline we are up against is the EN reviews must be completed and the 30 day period also completed prior to 17 AUG 2017 in order not to delay the already stringent timeline. This new NCNG Readiness Center will additionally be an economic asset to the Wilmington area. Again, we certainly appreciate any effort to get this review completed as soon as possible. Thank you, Cale D. Moody, PLS LTC, EN Fulltime: CFMO Deputy/Business Manager Office: (984) 664-6203 M-Day: CDR, 105th EN BN (RHINO 6) Office: (984) 661-2272 Mobile: (828) 734-9191 cale.d.moody.mil@mail.mil = ---- Original Message ----- From: Weaver, Cameron f mailto:cameron.weaver@ncdenr.gov] Sent: Friday, July 07, 2017 11:58 AM To: Moody, Cale D LTC USARMY NG NCARNG (US) <cale.d.moody.mil@mail.mil> Cc: Dudick, Vickie A NFG NG NCARNG (US) <vickie.a.dudick.nfg@mail.mil>; Scott, Georgette <georgette.scott@ncdenr.gov>; Johnson, Kelly <kelly.p.johnson@ncdenr.gov> Subject: FW: [Nllon-DoD Source] RE: National Guard Readiness Center Wilmington Express Review All active links contained in this email were disabled. Please verify the identity of the sender, and confirm the authenticity of all links contained within the message prior to copying and pasting the address to a Web browser. Hi LTC Moody: After hearing third -hand about your situation, I wanted to reach out to you directly. We make every effort to accommodate client schedules, but reviews are scheduled based on when the complete requests are received in our system and are spaced to allow the individual attention that is needed to expedite the Express Permit application reviews. We have a very limited staff available to conduct Express Reviews. In this case, after conversing via emails with Ms. Dudick, this review was already moved up once in our scheduling by more than a week by switching with the NGRC project in Jacksonville. 1 have now reached out to additional staff to see if they can accommodate your request, and I will let you know when our office is able to review your project. I will be in touch soon. Cameron Cameron Weaver Environmental Assistance Coordinator -Wilmington Regional Office NCDEQ-Division of Environmental Assistance and Customer Service 127 Cardinal Drive Ext. Wilmington, NC 28405 910-796-7303 NCDEQ NEW WEBSITE: Caution-http://deq.nc.gov/ DEACS NEW WEBSITE: Caution-http://deq.nc.gov/about/divisions/environmental-assistance-customer- service E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. -----Original Message ----- From: Dudick, Vickie A NFG NG NCARNG (US) [Caution-mailto:vickie.a.dudick.nfg@mail.mil] Sent: Tuesday, June 27, 2017 4:28 PM To: Weaver, Cameron <cameron.weaver@ncdenr.gov> Cc: Scott, Georgette <georgette.scott@ncdenr.gov>; Newton, Rodney D LTC USARMY NG NCARNG (US) <rodney.d.newton.mil @mail.mil>; Burriola, William S II CW2 USARMY NG NCARNG (US) <william.s.burriola.mil@mail.mil>; Gollings, Jamie E. <Jamie.Gollings@jacobs.com> Subject: RE: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review Cameron- Per our conversation this afternoon, the NCARNG would like to switch the Jacksonville express review with Wilmington's review date. This puts Wilmington submittal meeting scheduled for 7/25 @ 11am at the Wilmington DEQ office and Jacksonville scheduled for 8/2. Thank you for your consideration. Vickie A. Dudick Director of Environmental Management North Carolina National Guard 1636 Gold Star Drive Raleigh, NC 27607 984-664-6186 vickie.a.dudick.nfg@mail.mil -----Original Message ----- From: Weaver, Cameron [Caution-mailto:cameron.weaver@ncdenr.gov] Sent: Tuesday, June 27, 2017 9:38 AM To: Dudick, Vickie A NFG NG NCARNG (US) <vickie.a.dudick.nfg@mail.mil> Cc: Scott, Georgette <georgette.scott@ncdenr.gov>; Newton, Rodney D LTC USARMY NG NCARNG (US) <rodney.d.newton.mil@mail.mil>; Burriola, William S II CW2 USARMY NG NCARNG (US) <william.s.burriola.mil@mail.mil> Subject: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review All active links contained in this email were disabled. Please verify the identity of the sender, and confirm the authenticity of all links contained within the message prior to copying and pasting the address to a Web browser. Hi Vickie. You should be hearing from Jamie Gollings, your consultant of record on the request. This meeting has been scheduled forAugust 2 at 11 AM here at the Wilmington DEQ offices. Let me know of any issues. Cameron Cameron Weaver Environmental Assistance Coordinator -Wilmington Regional Office NCDLQ-Division of Environmental Assistance and Customer Service 127 Cardinal Drive Ext. Wilmington, NC 28405 910-796-7303 NCDEQ NEW WEBSITE: Caution-Caution-http://deq.nc.gov/ DEACS NEW WEBSITE: Caution-Caution-http://deq.nc.gov/about/divisions/environmental-assistance-c ustomer- service E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. -----Original Message ----- From: Dudick, Vickie A NFG NG NCARNG (US) [Caution-Caution-mailto:vickie.a.dudick.nfg@mail.mil] Sent: Tuesday, June 27, 2017 8:33 AM To: Weaver, Cameron <cameron.weaver@ncdenr.gov> Cc: Scott, Georgette <georgette.scott@ncdenr.gov>; Newton, Rodney D LTC USARMY NG NCARNG (US) <rodney.d.newton.mil@mail.mil>; Burriola, William S II CW2 USARMY NG NCARNG (US)<william.s.burriola.mil@mail. miI> Subject: RE: National Guard Readiness Center Wilmington Express Review Cameron- Any update on the Express Review for the NCARNG permits? Is the NCARNG on the schedule or do you need anything additional from us? Has another Reviewer been assigned? Thank you for your prompt attention. Vickie A. Dudick Director of Environmental Management North Carolina National Guard 1636 Gold Star Drive Raleigh, NC 27607 984-664-6186 vickie.a.dudick.nfg@mail.mil < Caution-Caution-mailto:vickie.a.dudick.nfg@mail.mil > -----Original Message ----- From: Weaver, Cameron [Caution-Caution-mailto:cameron.weaver@ncdenr.gov < Caution-Caution- mailto:cameron.weaver@ncdenr.gov > ] Sent: Thursday, June 15, 2017 3:21 PM To: Dudick, Vickie A NFG NG NCARNG (US) <vickie.a.dudick.nfg@mail.mil < Caution-Caution- mailto:vickie.a.dudick.nfg@mail.mil > > Cc: Scott, Georgette <georgette.scott@ncdenr.gov < Caution-Caution-mailto:georgette.scott@ncdenr.gov > > Subject: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review All active links contained in this email were disabled. Please verify the identity of the sender, and confirm the authenticity of all links contained within the message prior to copying and pasting the address to a Web browser. Hi Vickie. The quickness of the review is directly proportional to the completeness of the initial permit application packet that is brought to and discussed in the submittal meeting. The review meeting is scheduled so that the reviewer is able to put their attention on that particular project immediately, but it is a balancing act between ongoing Express reviews in house already with the reviewer and when the reviewer will be able to issue the permit from the latest Express submittal. The 30 days covers the reasonable assumption that two rounds of additional information will be needed from the applicant to complete the review. The more complete the application, the faster the overall turnaround for permit issuance. I'll be in touch on Monday with a date that a reviewer will be able to meet concerning the Express Review. Let me know of any other issues. Cameron Cameron Weaver Environmental Assistance Coordinator -Wilmington Regional Office NCDEQ-Division of Environmental Assistance and Customer Service 127 Cardinal Drive Ext. Wilmington, NC 28405 910-796-7303 10 NCDEQ NEW WEBSITE: Caution-Caution-Caution-http://deq.nc.gov/ DEACS NEW WEBSITE: Caution-Caution-Caution-http://deq.nc.gov/about/divisions/environmental-assi stance-c ustomer- service E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. -----Original Message ----- From: Dudick, Vickie A NFG NG NCARNG (US) [Caution-Caution-Caution-mailto:vickie.a.dudick.nfg@mail.mil] Sent: Thursday, June 15, 2017 2:48 PM To: Weaver, Cameron <cameron.weaver@ncdenr.gov < Caution-Caution-mailto:cameron.weaver@ncdenr.gov > > Cc: Burriola, William S II CW2 USARMY NG NCARNG (US) <william.s.burriola.mil@mail.mil < Caution-Caution-mailto:william.s.burriola.mil@mail.mil > > Subject: RE: National Guard Readiness Center Wilmington Express Review Cameron- Just want to clarify what you told us on the phone today- After the DEQ office meeting and acceptance, 30 days is required for express permitting? My understanding is the Express review for Erosion Control averages 1.6 days and express review for Storm Water control averages 7.6 days. Please let us know if this has changed from the attached. Thank you. Caution-Caution-Caution-http://deq.nc.gov/permits-regulations/express-permit 11 Ling -----Original Message ----- From: Dudick, Vickie A I`,,'FG NG NCARNG (US) Sent: Thursday, June 15, 2017 1:25 PM To:'cameron.weaver@ncdenr.gov'<cameron.weaver@ncdenr.gov < Caution-Caution- mailto:cameron.weaver@ncdenr.gov > > Cc: Burriola, William S II CW2 USARMY NG NCARNG (US) <william.s.burriola.mil@mail.mil < Caution-Caution-mailto:william.s.burriola.mil@mail.mil > >; Morris, Thomas S NFG NG NCARNG (US) <thomas.s.morrisl.nfg@mail.mil < Caution-Caution-mailto:thomas.s.morrisl.nfg@mail.mil > >; Newton, Rodney D LTC USARMY NG NCARNG (US) <rodney.d.newton.mii@mail.mil < Caution-Caution-mailto: rodney.d.newton.mil@mail.mil Subject: National Guard Readiness Center Wilmington Cameron- Per our conversation today, the NCARNG requests another Reviewer to expedite the National Guard Readiness Center Stormwater and Land Quality Express Permit Review. This project is a Federal contract with fiscal year 2017 funds which must be executed prior to September 30, 2017. Solicitation of bids can occur but the permits must be secured before the bids can be opened. Please note my correct email below. Thank you for your consideration. Vickie A. Dudick Director of Environmental Management North Carolina National Guard 1636 Gold Star Drive 12 Raleigh, NC 27607 984-664-6186 vickie.a.dudick.nfg@mail.mil < Caution-Caution-mailto:vickie.a.dudick.nfg@mail.mil > NOTICE -This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer. 13 Weaver, Cameron From: Dudick, Vickie A NFG NG NCARNG (US) <vickie.a.dudick.nfg@mail.mil> Sent: Friday, June 16, 2017 12:29 PM To: Weaver, Cameron; Scott, Georgette Cc: Burriola, William S II CW2 USARMY NG NCARNG (US); Newton, Rodney D LTC USARMY NG NCARNG (US) Subject: RE: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review Thank you for your prompt response. Please let Will Burriola, Cced above and 984-664-6354 or cell 919-218-6134 know on Monday. I will be on leave. -----Original Message ----- From: Weaver, Cameron[mailto:cameron.weaver@ncdenr.gov] Sent: Thursday, June 15, 2017 3:21 PM To: Dudick, Vickie A NFG NG NCARNG (US) <vickie.a.dudick.nfg@mail. mil> Cc: Scott, Georgette <georgette.scott@ncdenr.gov> Subject: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review All active links contained in this email were disabled. Please verify the identity of the sender, and confirm the authenticity of all links contained within the message prior to copying and pasting the address to a Web browser. Hi Vickie. The quickness of the review is directly proportional to the completeness of the initial permit application packet that is brought to and discussed in the submittal meeting. The review meeting is scheduled so that the reviewer is able to put their attention on that particular project immediately, but it is a balancing act between ongoing Express reviews in house already with the reviewer and when the reviewer will be able to issue the permit from the latest Express submittal. The 30 days covers the reasonable assumption that two rounds of additional information will be needed from the applicant to complete the review. The more complete the application, the faster the overall turnaround for permit issuance. I'll be in touch on Monday with a date that a reviewer will be able to meet concerning the Express Review. Let me know of any other issues. Cameron Cameron Weaver Environmental Assistance Coordinator -Wilmington Regional Office NCDEQ-Division of Environmental Assistance and Customer Service 127 Cardinal Drive Ext. Wilmington, NC 28405 910-796-7303 NCDEQ NEW WEBSITE: Caution-http://deq.nc.gov/ DEACS NEW WEBSITE: Caution-http://deq.nc.gov/about/divisions/environmental-assistance-customer- service E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. -----Original Message ----- From: Dudick, Vickie A NFG NG NCARNG (US) [Caution-mailto:vickie.a.dudick.nfg@mail.mil] Sent: Thursday, June 15, 2017 2:48 PM To: Weaver, Cameron <cameron.weaver@ncdenr.gov> Cc: Burriola, William S II CW2 USARMY NG NCARNG (US) <william.s.burriola.mil@mail.mil> Subject: RE: National Guard Readiness Center Wilmington Express Review Cameron- Just want to clarify what you told us on the phone today- After the DEQ office meeting and acceptance, 30 days is required for express permitting? My understanding is the Express review for Erosion Control averages 1.6 days and express review for Storm Water control averages 7.6 days. Please let us know if this has changed from the attached. Thank you. Caution-http://deq. nc.gov/permits-regulations/express-permitting -----Original Message ----- From: Dudick, Vickie A NFG NG NCARNG (US) Sent: Thursday, June 15, 2017 1:25 PM To:'cameron.weaver@ncdenr.gov' <cameron.weaver@ncdenr.gov> Cc: Burriola, William S II CW2 USARMY NG NCARNG (US) <william.s.burriola.mil@mail.mil>; Morris, Thomas S NFG NG NCARNG (US) <thomas.s.morrisl.nfg@mail.mil>; Newton, Rodney D LTC USARMY NG NCARNG (US) <rodney.d.newton.mil@mail.mil> , Subject: National Guard Readiness Center Wilmington Cameron- Per our conversation today, the NCARNG requests another Reviewer to expedite the National Guard Readiness Center Stormwater and Land Quality Express Permit Review. This project is a Federal contract with fiscal year 2017 funds which must be executed prior to September 30, 2017. Solicitation of bids can occur but the permits must be secured before the bids can be opened. Please note my correct email below. Thank you for your consideration. Vickie A. Dudick Director of Environmental Management North Carolina National Guard 1636 Gold Star Drive Raleigh, NC 27607 984-664-6186 2 Completeness Review Checklist Project Name: NG tj r 'L�) Received Date: Project Location: jlj {-{e,U Accepted Date: Rule(s) ' ®2008 Coastal ®1995 CoastalED Phase II (WiRO.) Universal L_J1988 Coastal Type of Permit: New or Mod or PR (Existing Permit # (Mod or PR): L{C%koCo =PE Cert on File.? Density: HD or LD I Type: Commercial or Residential �NCG: %: _�(% OK?) Stream Class: ®SA Map ®Offsite to SW8 Subdivided?: Subdivision or Single Lot IMORW Map r7Exempt Paperwork Emailed Engineer on: Supplement(s) (1 original per BMP) BMP Type(s): ®O&M with correct/original signatures (1 original per BMP except LS/VFS and swales) ®Application with correct/original signatures ®Deed ®Corp or LLC: Sig. Auth. per SoS or letter ®Email Address: Design Engineer ®$505 (within 6mo) ❑Email Address: Owner []Soils Report with SHWT Note to Reviewer: ®Calculations (signed/sealed) t9° *j 6-9-� MNo obvious errors LJPDensity includes common are Deed Restrictions, if subdivided. ®Signed & Notarized em—e ct T r W �M'Jt . & Plans Sets Details (roads, cul-de-sacs, curbs, sidewalks, BMPs, Buildings, etc) Grading Wetlands: Delineated or No Wetlands ®Vicinity Map ®Layout (proposed BUA dimensions) ®Legend ®DA Maps ®Project Boundaries Infiltration Wet Pond Offsite Soils Report ®Soils Report ®PE Cert for Master Lot #: SHWT: SHWT: ❑Deed Rest for Master ®Lot # Matches Master Bottom: PP: BUA Permitted (Master): sf Visited: BUA Proposed (Offsite): sf Additional Information: Permitted Proposed: Proposed: Proposed: BUA (sf) DA (sf) PP (el) SHWT (el) Depth (ft) SA (sf) JACOBS National Guard Readiness Center North Carolina National Guard Stormwater Management and Erosion Control Report ,`N tC A RO FES3% �E 029 �i'iq 18 �ur`�r Zol�' i 0 ! 07111/2017 i Issued for Permit Approval 1 T — 07/18/2017 Revised Per Reviewer Comments F6W72100-CI01-002 I 'I July 18, 2017 Document history and status PL I PL Distribution of copies JACOBS National Guard Readiness Center North Carolina National Guard Stormwater Management and Erosion Control Report ft 4'}I, JUL 2 0 200 BY• �' F6W72100-C101-002 1 July '18, 2C)1 Document history and status Distribution of copies Gtori%ji$w,W Manac ement viiciir`l IC'.t �s �u ,',J! c;r;11 -r 5,�Op {..✓Ct•t National Guard Readiness Center Project No: Document Title: Document No.: Revision: Date: Client Name: Client No: Project Manager: Author: File Name: F6W72100 Stormwater Management and Erosion Control Report F6W72100-C101-002 1 July 18, 2017 North Carolina National Guard Paul Langenfeld Jamie Gollings Jacobs Engineering Group Inc. 111 Corning Road, Suite 200 Cary, North Carolina 27518 United States T +1.919.859.5000 F +1.919.859.5151 www.jacobs.com ® Copyright 2017 Jacobs Engineering Group Inc. The concepts and information contained in this document are the property of Jacobs. Use or copying of this document in whole or in part without the written permission of Jacobs constitutes an infringement of copyright. Limitation: This document has been prepared on behalf of, and for the exclusive use of Jacobs' client, and is subject to, and issued in accordance with, the provisions of the contract between Jacobs and the client. Jacobs accepts no liability or responsibility whatsoever for, or in respect of, any use of, or reliance upon, this document by any third party. Contents Executive Summary ............................... 1. Methodology / Approach........... 1.1 Sand Filter Sizing and Design ..... 1.2 Dry Pond Design .......................... s ........................................................................................................1 ........................................................................................................ 3 ........................................................................................................ 3 ........................................................................................................ 3 Appendix A. Background Information Appendix B. Drainage Area Maps Appendix C. Sand Filter Design Appendix D. Dry Pond Design Appendix E. NCDEQ Stormwater Forms Appendix F. NCDEQ Erosion Control Forms and Calculations Appendix G. Previous Stormwater & Erosion Control Permit Documents Prepared by Tripp Engineering a"�+s�i'fi1�:5i'�1�s �Yt:`tlt-�'�j��''i8 �1a� ia�a`.i ! i'f.)�•�? ��i �nCi+..,rs� ?-•"vSTi'� Executive Summary The Noah Carolina National Guard pians to demoiish the existing Readiness Center located at 2412 Infantry Road and construct a new Readiness Center facility in the same location. The project generally includes demolition of the existing building, construction of the new building, site utilities, improvement of the previously permitted military vehicle parking area, and supporting facilities. The project was planned and permitted for Stormwater (SW8 140906) and Land Disturbance (NEWHA-2015- 007) as a renovation to the existing building renovation with the addition of military vehicle parking. The construction scope associated with the Stormwater and Land Disturbance Permits has been executed. From a Stormwater perspective, water quantity and quality compliance was permitted through the implementation of an infiltration basin. The infiltration basin included capacity for the immediately planned impervious cover plus some additional capacity for future impervious cover. From a Land Disturbance perspective, the extent of work from the original permit has been previously executed and the project team anticipates that a new permit will be issued vs. a permit modification. As the project has been rescoped to remove the existing building and create a significantly larger facility, the basis of design for the permitted infiltration basin is no longer applicable to the project and as such the project requires a modification to the existing Stormwater Permit. Furthermore, the existing infiltration basin is not performing as anticipated in the design and is holding water for extended periods of time. Given this site's immediate proximity to Wilmington International Airport, standing water creates conditions unfavorable to safe airport operations due to reflectivity and attraction of waterfowl. This project also includes a redevelopment component, with the current plan improving on. the Pre-1988 conditions from a stormwater quality perspective. In the Pre-1988 condition, there were no stormwater control Treasures in place. Stormwater runoff generated from impervious cover was conveyed offsite by a network of storm pipes and channels without treatment. A significant portion of this runoff was directly connected to the storm drainage network. In the current proposed conditions, almost all new impervious is either captured and directed to Stormwater Control Measures (SCM's) or is disconnected impervious having opportunity to sheet flow and be conveyed by vegetated swales prior to being discharged off site. Refer to the project plan set for more detail. The combination of site hydrologic conditions and proximity to the airport result create a situation where the only option to meet stormwater quality and quantity requirements is a sand filter / dry pond treatment train. The sand filters act as primary stormwater control measures (SCM's) providing water quality treatment and the dry pond provides peak flow attenuation from new development. Refer to plans for more information on the location of the proposed sand filters and dry pond. � IF \44,1 0 WAX," trni "1'a`er Management and 7-��+r��:n�� RESiUL I S SUMMARY: Stormwater Quality • Net increase in impervious cover is treated by both primary as well as secondary Stormwater Control Measures (SCM's) • Primary SCM: Sand Filters, designed per Minimum Design Criteria (MDC's) • Secondary SCM: Dry Pond, designed per Minimum Design Criteria (MDC's) Stormwater Quantity • Peak flow attenuation achieved to below predevelopment levels through 50-year event: 1•-Year 2-Year iO-Year 25-Year 50-Year too -Year (ctsj JOS) (0s) (0s) (cfe) {ofm Pre -Developed I 1.24 1.51 1.70 1.85 2.00 Post -Developed 0.11 I 0.1410.20 i 0.22 I1 0.96 2.13 Future Development Although additional permitting would be needed at the appropriate time, this calculation report demonstrates that the dry pond is capable of managing an additional 54,450 sf of impervious cover should that become desired at some point in the future. Additional impervious cover would also likely require an upstream Primary SCM (sand filter) to be designed and permitted accordingly. HVV' 2!7o0-UG —G'r ►UI, ,iv,aiter Management and E os-loz Cali! Ton! I. Methodology / Approach The following is a summary of the stormwater calculation approach for compliance with both the water quality and water quantity requirements for the National Guard Readiness Center project. Generally speaking, the project utilizes sand filters as Primary SCM's ahead of a dry pond designed as a Secondary SCM. As noted in the executive summary, the combination of site hydrologic conditions and proximity to the airport result create a situation where the only option to meet stormwater quality and quantity requirements is a sand filter / dry pond treatment train. Refer to Appendix A for general background information for the existing site. 1.1 Sand Filter Sizing and Design The project utilizes two sand filters to provide the necessary primary treatment of stormwater runoff. Each sand filter was designed to meet each of the Minimum Design Criteria (MDC) outlined in NCDEQ's January 2017 version of the "Stormwater Design Manual". Appendix B includes detailed information on the design of each sand filter and demonstrates how each sandfilter complies with the Sand Filter MDC's. 1.2 Dry Pond Design The project utilizes a dry pond to provide secondary treatment of stormwater runoff. The dry pond was designed to meet each of the Minimum Design Criteria (MDC) outlined in NCDEQ's January 2017 version of the "Stormwater Design Manual". Appendix C includes detailed information on the dry pond design and how it complies with the Dry Pond MDC's. Pre -developed flows were developed for the site under the previously approved Stormwater Permit (SW8 140906). For any given storms that did not have previously calculated pre -developed runoff rates, the methodology was duplicated to determine a target rate. Post -developed flows are routed through the dry pond using SCS discreet curve number methodology (TR-55). Refer to Appendix C for more detail on Dry Pond design, calculations, and routing. S ,AOrrr1%d-,AAC,i' awl", Froslioin (-,Onts-ei RepvTk wb� mah-M Appendix A. Background Information • USDA Soils Map • FEMA Floodmap • USGS Quadrangle Map • Deed • Geotechnical Report • Jurisdictional Wetland Map z OMM czzm 04LSM CnQvf n noa c M9Zi5 aL M db DES eu x 7A SY 4r W Oi Z O O C w an O 0 6i N 1 t6 N CP S D QQ� i+ II Li g� H z 3 7 o w to O 0 a, '4 fA C N c 77° SY N W 4 9794W0' 37 Q20 379M WM120 r3 E5170 9785i20 578�7D v_ r � Z Z 77' 5T47"W 0 z w 0 Z w oCi � 2L ao c n Z m 0 0 � w O 7 w 7r SY 76" W p K 0 ,,j� see + gIy $ 0 a 'vy, yam, '" I"" 0 �� sq,[ X o 7y� x 19 C- o_ � N D ❑ a m m w o m 3 S m m L) C7 n R3 m O c In N Cn 7 N D eo M `< a < m <a ii m W vl m a < a < m O m C y c O 7 -n ° °c a O, O. O. .fir m m o o p O T m Dom+ Doi Doi ° D Q m o O� n 1 C L N _ W a 3 O O N a o a MM D m C w � o m 0 o w 0 p CD < f° (n rn a o m v m 'm c w m m m 3 m n j in 4 -a o .= _. (n D o a CL a 2 w N ro a m (o m w o C N Er � w N o 7' 0 3 O D] — (n 60 ca(D r- O. 0-1 3 0 D Q 'O 7a Q y o m (7 V) O CD O M CD N o m ° O C7C -i s S a CZ 3 N CD 9 (DO— 0 3 <— �� (D -0 (0('1 C (D 9j 5- -0 N y 7 0 O Cl C O. in N W Of N pOj ((D y" .7.. C N (D O 0- I 01 N c0 O f0 1 0 O: O. O v N `< C D cD C M 'A �� O O O C y 7N y 3 �' � � N 3ol - 7 7 M. O C 3_ Cl) N `< f7i_ O .o. A 3 �l 61 O. * O C 3� N w (D m 7 O a Q O y 0 CL N C N d n N �_ d O CD .,O< Q -�-, 3 (O O N (D ID d m m m fD .d-« @ fD 7' 0 N N CD N `< 5 N ,,7.. N -i 7 S= d I N .7_.' �� m l0 m °' z 7 (D O a N o D(o 3 C z Xm w 0)3• Km o-° 14 3 K m st �,0"o(yDo �r� H om�o � $ °' y ° N °- O = :3 (y(ppm O- C fN - lD N fn 06 N �, y C < 0 a �3wm 0 w (° 3�Doa' f0 N o c3i° a 7R m wZ3 o N �°< co o s �07i�< c m ;2 EF< .< Dmo Cr N m 7 V N G Sr - N Q � ? 7° a N 7/ Op ^� D < M n d Q(D O. N 3g� CE N 7' Z fD Q z 7 p v' �i) N 3 i y SDp1 3 C, y m N (D Y N (CD N m O ci � N C � ao d m R:, 3 m o m w n $ rL aw S' o °i v oco 3 = c v (D Q �` y Q N (CD 3 O y N (D < m O o CD N Q g (3 m N Q m O N N n ; a w C fD R fD _ N (D�. (D t w �Oi O I O i W -1 DT V m () m z v D z n X z U) O Soil Map --Neer Hanover County, North Carolina National Guard Readiness Center Map Unit Legend New Ha>tover County, North Caroltna (KCM) Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI Be Baymeade fine sand, f to 6 10.8 71.0% - ._......_.__....._ percent slopes Bp . ......... ................ --- ........ Borrow pits 1.0 _._._ _...._. .... 6.4% Se Seagate fine sand 3A 22.6% St Stallings fine sand 0.0 0.0% Totals for Area of Interest 15.2 100.0 /o w Natural Resources Web Soil Survey 6/21/2017 Conservation Service National Cooperative Soil Survey Page 3 of 3 Engineering Properties --New Hanover County, North Carolina National Guard Readiness Center Engineering Properties This table gives the engineering classifications and the range of engineering properties for the layers of each soil in the survey area. Hydrologic soil group is a group of soils having similar runoff potential under similar storm and cover conditions. The criteria for determining Hydrologic soil group is found in the National Engineering Handbook, Chapter 7 issued May 2007(http://directives.sc.egov.usda.gov/OpenNonWebContent.aspx? content= 1 7757.wba). Listing HSGs by soil map unit component and not by soil series is a new concept for the engineers. fast engineering references contained lists of HSGs by soil series. Soil series are continually being defined and redefined, and the list of soil series names changes so frequently as to make the task of maintaining a single national list virtually impossible. Therefore, the criteria is now used to calculate the HSG using the component soil properties and no such national series lists will be maintained. All such references are obsolete and their use should be discontinued. Soil properties that influence runoff potential are those that influence the minimum rate of infiltration for a bare soil after prolonged wetting and when not frozen. These properties are depth to a seasonal high water table, saturated hydraulic conductivity after prolonged wetting. and depth to a layer with a very slow water transmission rate. Changes in soil properties caused by land management or climate changes also cause the hydrologic soi group to change. The influence of ground cover is treated independently. There are four hydrologic soil groups, A, B: C, and D, and three dual groups. A/D. B/D, and C/D. In the dual groups, the first letter is for drained areas and the second letter is for undrained areas. The four hydrologic soil groups are described in the following paragraphs: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. Depth to the upper and lower boundaries of each layer is indicated uspA Natural Resources Web Soil Survey 6/2112017 �i ` Conservation Service National Cooperative Soil Survey Page 1 of 6 Engineering Properties --New Hanover County, North Carolina National Guard Readiness Center Texture is given in the standard terms used by the U.S. Department of Agriculture. These terms are defined according to percentages of sand, silt, and clay in the fraction of the soil that is less than 2 millimeters in diameter. "Loam," for example, is soil that is 7 to 27 percent clay, 28 to 50 percent silt, and less than 52 percent sand. If the content of particles coarser than sand is 15 percent or more, an appropriate modifier is added, for example, "gravelly." Classification of the soils is determined according to the Unified soil classification system (ASTM, 2005) and the system adopted by the American Association of State Highway and Transportation Officials (AASHTO, 2004). The Unified system classifies soils according to properties that affect their use as construction material. Soils are classified according to particle -size distribution of the fraction less than 3 inches in diameter and according to plasticity index, liquid limit, and organic matter content. Sandy and gravelly soils are identified as GW, GP, GM, GC, SW. SP, SM, and SC; silty and clayey soils as ML, CL, OL, MH, CH, and OH; and highly organic soils as PT. Soils exhibiting engineering properties of two groups can have a dual classification, for example, CL-ML. The AASHTO system classes soils according to those properties that affect roadway construction and maintenance. In this system, the fraction of a mineral soil that is less than 3 inches in diameter is classified in one of seven groups from A-1 through A-7 on the basis of particle -size distribution, liquid limit, and plasticity index. Soils in group A-1 are coarse grained and low in content of fines (silt and clay). At the other extreme, soils in group A-7 are fine grained. Highly organic soils are classified in group A-8 on the basis of visual inspection. If laboratory data are available, the A-1, A-2, and A-7 groups are further classified as A-1-a, A-1-b, A-2-4, A-2-5, A-2-6, A-2-7, A-7-5, or A-7-6. As an additional refinement, the suitability of a soil as subgrade material can be indicated by a group index number. Group index numbers range from 0 for the best subgrade material to 20 or higher for the poorest. Percentage of rock fragments larger than 10 inches in diameter and 3 to 10 inches in diameter are indicated as a percentage of the total soil on a dry -weight basis. The percentages are estimates determined mainly by converting volume percentage in the field to weight percentage. Three values are provided to identify the expected Low (L), Representative Value (R), and High (H). Percentage (of soil particles) passing designated sieves is the percentage of the soil fraction less than 3 inches in diameter based on an ovendry weight. The sieves, numbers 4, 10, 40, and 200 ([SSA Standard Series), have openings of 4.76, 2.00, 0.420, and 0.074 millimeters, respectively. Estimates are based on laboratory tests of soils sampled in the survey area and in nearby areas and on estimates made in the field. Three values are provided to identify the expected Low (L), Representative Value (R), and High (H). Liquid limit and plasticity index (Atterberg limits) indicate the plasticity characteristics of a soil. The estimates are based on test data from the survey area or from nearby areas and on field examination. Three values are provided to identify the expected Low (L), Representative Value (R), and High (H). References: American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. uSDA Natural Resources Web Soil Survey 6/2112017 c� Conservation Service National Cooperative Soil Survey Page 2 of 6 National Guard Readiness Center Engineering Properties ---New Hanover County, North Carolina American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. usC+_A, Matural Resources Web Soil Survey 6/21/2017 Conservation Service National Cooperative Soil Survey Page 3 of 6 W c m U r 0 Z C 0 U 0 0 c W t' rL a C .0 C Im W. L Q 7 O Q E y v O w 'o J N N cN� U) � O IM CL •.7 e —O ©? � N C tU) O O N � U? CL ---V c O m rn� •N Q o U N oiz:�:2 N CL t�mc`o E N ? •L r O LO ai CL cO0Or- 6 U $ T O _ c i i 0).2 C a:++ fN .L Q C y cc� U Z% X N r W CD -0 C tN C �wc o a� C c U+•° O> W CD c 7 z N r O > O m �z N O toCDC CL U)O Q COL °°O� — ® L9 O< ° 0. J CL Z (L Z n Z a Z Q Z ,'. N e- Q �.' 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U)i ttl EOIM � T T i — T � •3. - � am.. iww �+ m r m � o IDon cl @ H AEEe E I mc cla.mCcmO W O O 04= N N ?o+�m m r_m O O C ON :.w m N In oL N O aN•• N 00 NCP "' I CQ b C6 •- v a d r vN o v 3 N C -I a c c_ co 0 co CD s Zo N = O 04 C U agi N E 0 N C _ .N Z L m QD Qv�' Q1 1 4.0 (n N C/3 CO m z a '(C 17 ' 12:, ROM CAROL11M t 01 C t R_ f f NEW HANOVER COUNTY buxil2i wu 2oZO..it.C- This deed, made this ? day of ) llr.t Ae,. , 19-;LL by and between the CCUFff OF NEW EAROVER, a political subdivision of the State of I North Carolina, whose address is the Courthouse, Wilmington, North Carolina, grantor, and the UNITED STATES OF AbWICA, grantee; WITNESS -ETA: THAT, WHEREAS the Board of County Commissioners of the County of New Hanover, State of North Carolina, in a meeting duly.assembled, has heretofore adopted a Resolution authorizing and directing the conveyance without con- sideration pursuant to North Carolina General Statutes Section 16oA-274, as amended by House Bill 351, ratified 1B March 1977, of a tract of land here- inafter described and comprising a portion of the New Hanover County Airport; and S WHEREAS, it has been determined by said Resolution that said tract of land is not necessary for the public purposes of New Hanover County, and that It would be in the best interests of the people of New Hanover County to convey said tract of land upon said terms to the United States of America; and WHEREAS, the United States of America has agreed that it is in its best interests to accept said conveyances of land upon said terms; NOW THEREFORE, in consideration of the premises and other benefits occurring generally to the County of New Hanover and its people, the County of New Hanover has given, remised, released, quitclaimed and conveyed, and by these presents does hereby give, remise, release, quitclaim and convey unto the United States of America, its successors and assigns all rigbt, title, interest or estate of the County of New Hanover in and to the following - described tract of land constituting a portion of New Hanover County Airport (the former Bluethenthal Field) said land lying to the southeast of the north - vest southeast runway (runway 34-16), and which is shown in red on a map attached hereto and entitled Exhibit "A-1", and which is more particularly described as follows: aEfUBHfC i •� � �'.., FACE 1 OF 3 6ao2 rct :2;. All that tract of land situate in Nov Hanover County. State of North Carolina, being bound now or formerly on the north, east._ south. and best, by land of the New Hanover County Airport, and being more particularly described as follows: Beginning at a concrete monument having a coordinate value of N 189,290.60 feet, s 2,334.4D9.98 feet, located £ 160 h0' 30" W 268.49 feet from a nail and cap in the centerline of NCSR No. 1175; thence, rron the point of beginning with the lands of New Hanover County Airport the following courses and distances: S 310 11' 33" V 4h0,70 feet to a concrete monument. S 48D 51' 03" E 296.31 feet to a concrete monument S 410 07' 13" N 730.3% feet to a concrete monument, B 730 01' 04" u 476.29 feet to a concrete monument, It820 58, 25" W 955.11h feet to a concrete monument, S 680 3T' 29" V 183.43 feet to a concrete monument, N 210 38' 08" H 100.01 feet to a concrete monument, S 680 21F 52" A T5.00 feet to a concrete monument, R 530 38' 51" N 235.83 feet to a concrete monument, N 680 21' 52" E 200.01 feet to a concrete monument,8 210 38' 08" E 20.06 feet to a concrete monu- ment, S 790 19' 48" 1402.24 feet to a concrete monument, R 530 32, h0" E 436.Oh fest to a concrete monument, N 270 36' 35" E 397.64 feet to a concrete monument, r 090 06' 44" V 399.07 feet to a concrete monument, N 550 26' 18" 8 519.62 feet to a concrete monument, S 820 59' 31" E passing a concrete monument at 6T6.11 feet in all 695.85 feet to an iron pipe having a coordinate value of N 189,480.44 feet; B 2,334,232,h2 feet located 7 feet southwest of the centerline of a paved road; thence. leaving the road S 430 05' 06" E crossing the center of another paved road 259.94 feet to the point of beginning and containing 41.27 acres more or less. Said tract of land is described with more particularity in that certain Survey Map drawn by William W. Blanchard, Inc., Surveyors, of Vallace, North Carolina, dated 22 June 1976, which map is attached hereto and incorporated by reference herein as Exhibit "A". The bearings and coordinates used heroin including those used in said nap are based on the North Carolina Plane Coordinate System. TO HAVE AND TO HOLD the aforesaid tract of land and all privileges thereunto belonging or pertaining, to it, the said grantee, the UNITED STATES OF AMERICA, and its successors and assigns, free and discharged from all right, title, claim, estate or interest of any kind of the said grantor, the County of New Hanover, North Carolina, or anyone claiming by, through or under it. IN TFMI14ONY WMEOF, the said County of New Hanover has caused this instrument to be signed in its name by the Chairman of its Board of Commissioners, and Ate"Aed thereto by the Clerk of the said Board of Commissioners, and the �tommon seal.or*9ev..Hanover County to be hereto affixed, all by order and `authority of a Resolution duly adopted on the �/ � . day of s. . -, aV ¢ regular meeting of said New Hanover County Board of Commissioners. SEAL �C' i. P C:1• `C COUNTY OF NEN HANOVER, NORTH CAROLINA ATTFST: By Chairman, Board of County C issioners Clerk, Board of County Commissioners PAGE 2 OF 3 NORTH CAROLINA bDA121 mi 22 M 11"Win COUNTY The A..dV Of_-_220&,IZV�19 7 , personally appeared before we Ali J4 a Rotary Public in and for the County of Hew Hanover, State of North Carolina, who is known to me and who being by me first duly sworn, deposes and says as follows; 4hat4he is personally acquainted with c A'd Q' . , who is Chairman of the Hoard of County 61 Commissioners for the County of New Hanover, State of North Carolina, and that she the said _ &&&L LA- %z.s+y,+� is Clerk of the Hoard of County Commissioners for said New Hanover County, North Carolina, and that sire knows the common seal of said New Hanover County; thatshe saw -the said Uatad o'dk,� UA- 1 (1 Chairman of the Board of County Commissioners of said New 9Hanover County sign the foregoing instrument, and thatjhe, the said )!?A Clerk to the said Board, signed b-Is name thereto in attestation thereof, and affixed the common Beal of said New Hanover County, North Carolina, all by authority duly given by Resolution adopted by the New Hanover County Board of Commissioners, and that the foregoing instrument is the act and deed of said Board of Commissioners of New Hanover County, Borth Carolina, and is within the scope of its povers as granted by lay. Nitness may hand and notarial seal this the d'Lday Of jQA&,lc%ttJ 19 7 :,(S-i : L1' Notary Public ty Commission E�Kpires: (JfilJ !`� M? PACE 3 OF 3 600ki-121 FA-,i 23 RESOLUTION WHEREAS, the County or New Hanover has no need in the foreseeable nature for the tract of lams hereinafter described; and WHEREAS, said tract of land comprises approximately 41.27 scram of land of the Rev Hanover County Airport (formerly Sluethenthal Field), said land being part of some 80 acres lying southeast of the northvest-soutbeast runaway formerly leased from New Hanover County by the United States Air Fores; and WHEREAS, the United States Air Force bas declared that it no longer needs said 80 acres of land; and WHEREAS, the United States of America has expressed a need to retain the hereinafter -described hl.27 acre tract of land on a permanent basis for use by the United States Army National Guard; and WHEREAS, it is deemed by this Board of Commissioners to be in the best interests of New Hanover County and its people generally to convey said hl.27 acre tract of land to the Federal Government for said purpose; and WHEREAS, the Board of Commissioners of New Hanover County has been empowered and authorised by House Bill 351 ratified 1S March 1977 amending North Carolina General Statutes Section 16OA-274 to convey said tract of land without consideration to the United States Government; and WHEREAS, although said other conveyances bear no relationship to the Instant transaction, or to the consideration or lack of consideration thereof, several other tracts of land and appurtenant facilities and equipment of considerable value at said Rev Hanover County Airport have been or will be conveyed without consideration by the Federal Government to New Hanover County; and WHEREAS, the tract of land which is the subject of this transaction is more particularly described as follows: All that tract of land situate in New Hanover County, State of North Carolina, being bound now or formerly on the north, east, south, and vest, by land of the New Hanover County Airport, and being more particularly described as follows: A at PAGE 1 OF 3 aoaxil2i fait 24 Beginning at a concrete monument having a coordinate value of N 09,290.60 feet, E 2,334,4o9.98 feet, located B 160 40' 30" W 268.49 feet from a nail and cap in the centerline of JCSR No. 1175; thence, from the point of beginning with the lands of New Hanover County Airport the following courses and distances- 5 310 11' 33" W 440.70 feet to a concrete monument, S 480 51' 03" B 296.31 feat to a concrete monument, B 410 07, 13" W 730.34 feet to a concrete mooumert, S 730 O1' 04" W 476.29 feet to e concrete monument, N $20-58' 25" W 955.44 feet to a concrete monument, S 68P 3T' 29" W 183.43 feet to a concrete monument, N 210 38' 08" W 100.01 feet to a concrete monument. B 680 21, 52" U MOO feet to a concrete monument, N 530 38' 51" W 235.83 feet to a concrete monument, N 680 21' 52" E 200.01 feet to a concrete monument, S 210 38' 08" E 2o.06 feet to a concrete monument, 5 T90 19' 48" E WA feet to a concrete monument, N 530 32, 40" E 436.04 feet to a concrete -monument, N 270 36' 35" E 397.64 feet to a concrete monument, N 090 D6' 44" W 399.OT feet to a concrete monument, N 550 26' 18" E 519.62 feet to a concrete monument, S 820 59' 31" E passing a concrete monument at 676.11 feet in all 695.86 feet to an iron pipe having a coordinate value of N 1899480.44 feet; E 2,334,232.42 feet located 7 feet southwest of the centerline of a paved road; thence, leaving the road S 430 05' 06" E crossing the center of another paved road 259.94 feet to the point of beginning and containing 41.27 acres more or less. Said tract of land is described with more particularity in that certain Survey Map drawn by William W. Blanchard, Inc., Surveyors, of Wallace, North Carolina, dated 22 June 1976, which map is attached hereto and incorporated by reference herein as Exhibit 'An The bearings and coordinates used herein including those used in said map are based on the North Carolina Plane Coordinate System. NOW THEREFORE, BE IT RESOLVED that the Chairman of this Board of Commissioners cf New Hanover County, North Carolina, be and hereby is authorized and empovered by said Board of Commissioners to convey the here inabove-described tract of land on the above -discussed terms and conditions by Quitclaim Deed to the United vtq¢es of America. • SLR' • SEAL: - ;ATTEST: Clerk, Board of County Commissioners COUNTY OF NEW HOOVER, NORTH CAROLINA BY 2 Chairman, Board of County Commissioners PACE 2 OF 3 NORTH CAROL.Nn eaodl21 ma 2s NEH RANOva Comm The YA- day of n . 19 97 . personally appeared before me a N�ot"7 Poblic In and for the Caun y of New Hanover, State of North Carolina, y«- rj _ r� vho is known to.um and who being by me first duly svorn, deposes and says as follows: Thatshe is personally acquainted with___fLtL" o�,�l � who is Chairman of the Hoard of County Commissioners for the County of New Hanover, State of North Carolina, and thatshe the said 4'.0 is Clerk o!' the Beard of County Commissioners for said Nev Hanover County, North Carolina, and that.:he knows the common seal of said New Hanover County; that She saw the said r Yllltn( 01jiiielt _ 9ri- , Chairman of the Board of County Commissioners of said New Hanover County sign the fore- going instrL ment, snd that -tie. the said Clerk to t>ie said Board, signed hW name thereto in attestation thereof, and nffixe❑ t-hr• rnmmon seal of said New Hanover County, North Carolina, all by authority duly given by the New Hanover County Board of Commissioners, and MA that the foregoing instrument is the act and deed of said Board of Commissioners of Nex Hanover County, Forth Carolina, and is within the scope of its powers as granted by lnw. i Hitncss my hand and notarial seal this the d ""day of 7; h� 1977. (SEAL) Notary Public Ce>mDAlidn Expires: Ocry4,_ /7. /9)P i STATE OF NORTH CAROLINA. Ncw Hanorcr County T6eForegoing Certifcame(s)ol --Grp,�QIIf,1tS,,_d.iiAxdlX—Eubl�S..--------------- ... ------------------------------- _______ __ _ ___—_—_---Akxare) cerwiied'a This---iZ--dtyof_ .DSS€mb�� -------- AA.19_Z7—. DMWO BY _S9StOLY_C_o J•3§3ona<rs ---------------- Lois C. LrRay, Reyster of v Deputy PAGE 3 OF 3 REPORT OF SUBSURFACE EXPLORATION AND GEOTECHNICAL ENGINEERING ANALYSIS NCANG - READINESS CENTER WILMINGTON, NEW HANOVER COUNTY, NORTH CAROLINA TM PREPARED FOR: PAUL LANGENFELD, P.E. JACOBS GBNA 1100 NORTH GLEBE ROAD, SUITE 500 ARLINGTON, VIRGINIA 22201 ECS SOUTHEAST, LLP PROJECT NO.: 22.24922 FEBRUARY 15, 2017 r — _ i EjjECS C R LI NI A , LLP "Setting the Standard for Service" = Geotechnical • Construction Materials • Environmental • Facilities NC Registered Engineering Firm r-1078 February 15, 2017 Paul Langenfeld, P.E. Jacobs GBNA 1100 North Glebe Road, Suite 500 Arlington, Virginia 22201 Re: Report of Subsurface Exploration and Geotechnical Engineering Analysis NCANG — Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No.: 22.24922 Dear Mr. Langenfeld: As authorized by your acceptance of our proposal number 22.21012, dated September 12, 2016, ECS Southeast, LLP (ECS) has completed a subsurface exploration for the subject project. This report presents the results of the field exploration and engineering analysis, along with our recommendations for design of geotechnical related items. We appreciate the opportunity to be of service to you during the design phase of this project and look forward to our continued involvement during the construction phase. If you have any questions concerning the information and recommendations presented in this report, please contact us at (910) 686-9114 for further assistance. Respectfully submitted, ECS SOUTHEAST, LLP Mike Ellis, E.I. Winslow E. Goins, P.E Project Manager Project Engineer North Carolina License No. 033571 67,14 Netherlands Drive, Wilmington, NC 28405 - T: 910-686-9114 • F: 910-686-9666 • www.ecslimited.com ECS Carolinas, LLP • ECS Florida, LLC • ECS Midwest, LLC - ECS Mid -Atlantic, LLC • ECS Southeast. LLC • ECS Texas, LLP REPORT OF SUBSURFACE EXPLORATION AND GEOTECHNICAL ENGINEERING ANALYSIS NCANG - READINESS CENTER WILMINGTON, NEW HANOVER COUNTY, NORTH CAROLINA PREPARED FOR: PAUL LANGENFELD, P.E. JACOBS GBNA 1100 NORTH GLEBE ROAD, SUITE 500 ARLINGTON, VIRGINIA 22201 ECS SOUTHEAST, LLP 5714 NETHERLANDS DRIVE WILMINGTON, NORTH CAROLINA 28405 ECS SOUTHEAST, LLP PROJECT NO.: 22.24922 FIRM NO. F-1078 WINSLOW E. GOINS. P.E. �, ,,2/15/17 NC LICENSE NO. 033751 FEBRUARY 15, 2017 1.0 EXECUTIVE SUMMARY ...................................................................................................... 1 2.0 PROJECT OVERVIEW........................................................................................................ 2 2.1 Project Information.......................................................................................................... 2 2.2 Scope of Work................................................................................................................ 2 2.3 Purpose of Exploration.................................................................................................... 2 3.0 EXPLORATION PROCEDURES.......................................................................................... 3 3.1 Subsurface Exploration Procedures................................................................................ 3 3.1.1 Soil Test Borings..................................................................................................... 3 3.2. Laboratory Testing Program.......................................................................................... 4 4.0 EXPLORATION RESULTS.................................................................................................. 5 4.1 Site Conditions................................................................................................................ 5 4.2 Regional Geology........................................................................................................... 5 4.3 Soil Conditions................................................................................................................ 5 4.4 Groundwater Conditions................................................................................................. 6 4.5 Laboratory Test Results.................................................................................................. 6 5.0 ANALYSIS AND RECOMMENDATIONS............................................................................. 7 5.1 Subgrade Preparation..................................................................................................... 7 5.2 Engineered Fill Placement.............................................................................................. 8 5.3 Foundation Design.......................................................................................................... 9 5.4 Floor Slab Design......................................................................................................... 10 5.5 Seismic Class Determination and Liquefaction Potential ............................................... 10 5.6 Pavement Design Considerations................................................................................. 11 5.7 Site Drainage................................................................................................................ 11 5.8 Construction Considerations......................................................................................... 12 6.0 CLOSING........................................................................................................................... 13 APPENDICES TABLE OF CONTENTS APPENDIX A -FIGURES APPENDIX B-BORING LOGS APPENDIX C-LABORATORY TEST RESULTS APPENDIX D-CALCULATIONS APPENDIX E-GENERAL CONDITIONS Report of Subsurface Exploration and Geotechnical Engineering Analysis NCANG — Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No.: 22.24922 1.0 EXECUTIVE SUMMARY This report contains the results of our subsurface exploration and geotechnical engineering analysis for the proposed site located at 2412 Infantry Road in Wilmington, New Hanover County, North Carolina. At the time of our exploration, the site consisted of the existing armory building, with existing parking lot and a basketball court, and relatively open areas. The proposed construction will consist of demolishing the existing readiness center and replacing it with a new 2-story readiness center with a gross square footage of 52,792 sf accompanied with an unheated storage facility with a gross square footage of 4,351 sf, a controlled waste handling facility with a gross square footage of 330 sf, and a flammable materials building with a gross square footage of 220 sf. Additional parking and drive areas will be constructed north of the proposed facility. Maximum column and wall loads are anticipated to be approximately 230 kips and 8.3 kips per foot, respectively. Project information including design site grades were not available at the time of this report. At the surface, approximately 3 to 6 inches of topsoil was reported by the drillers at boring locations B-1, and B-5 through B-10. Boring B-2 consisted of approximately 4 inches of gravel at the surface. Borings B-3 and B-4 consisted of approximately 5 inches of asphalt with a thin layer of concrete coating on boring B-3. Beneath the surface material to a depth of approximately 15 feet, the borings typically encountered intermittent layers of very loose to dense, silty and clean sands (SM, SP) and very soft to medium stiff, sandy lean clay and sandy fat clay (CL, CH). From a depth of 15 to a depth of approximately 32 feet, borings B-1 through B-8 typically encountered intermittent layers of very loose to dense, sands (SP) and very soft to stiff, sandy clay (CL) and medium stiff, organic soils (OL/OH). From a depth of 32 feet to a depth of approximately 40 feet, borings B-1 through B-8 typically encountered intermittent layers of medium dense to dense clean sands (SP) and hard sandy silt (ML) with cemented layers. From a depth of 40 feet to a refusal depth of 64.6, Boring B-8 consisted of medium dense, silty fine sand (SM), and very stiff to hard, sandy silt (ML) with cemented layers. It is important to note that the natural geology at the site has been modified in the past. Therefore, potential fill and unsuitable materials may be present at the site. In summary, the proposed building can be supported on conventional shallow foundations. For foundations designed in accordance with the recommendations provided in this report, a maximum net allowable soil bearing pressure of 1,500 pounds per square foot (psf) is recommended for use in proportioning shallow foundations. Due to the presence of loose near surface sands and soft clays in the former building footprint area, in -place densification or undercutting of the slab, footing and pavement subgrade soils should be anticipated. Once structural loads and site grades are finalized, ECS requests the opportunity to review and, if necessary, revise our recommendations. Specific information regarding the subsurface exploration procedures used, the site and subsurface conditions at the time of our exploration, and our conclusions and recommendations concerning the geotechnical design and construction aspects of the project are discussed in detail in the subsequent sections of this report. Please note this Executive Summary is an important part of this report and should be considered a "summary" only. The subsequent sections of this report constitute our findings, conclusions, and recommendations in their entirety. Report of Subsurface Exploration and Geotechnical Engineering Analysis NCANG — Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No.: 22.24922 2.0 PROJECT OVERVIEW 2.1 Prolect Information This report contains the results of our subsurface exploration and geotechnical engineering analysis for the proposed site located at 2412 Infantry Road in Wilmington, New Hanover County, North Carolina. At the time of our exploration, the site consisted of the existing armory building, with existing parking lot and a basketball court, and relatively open areas. ECS' understanding of this project is based on information provided by David Everett, AIA and Paul Langenfeld, P.E. of Jacobs GBNA. The proposed construction will consist of demolishing the existing readiness center and replacing it with a new 2-story readiness center with a gross square footage of 52,792 sf accompanied with an unheated storage facility with a gross square footage of 4,351 sf, a controlled waste handling facility with a gross square footage of 330 sf, and a flammable materials building with a gross square footage of 220 sf. Additional parking and drive areas will be constructed north of the proposed facility. The structural systems of the proposed readiness center will consist of a metal deck on steel beams/bar joists roof system with joists ends bearing on steel beams/joist girders at the building interiors and steam beams at the exterior wall. The floor system will consist of 6.5 inches of concrete poured over a 3 inch, galvanized composite metal deck and composite steel beams. The foundation system and ground floor are anticipated to be conventional shallow foundations and a slab -on -grade. Maximum column and wall loads are anticipated to be approximately 230 kips and 8.3 kips per foot, respectively. Additional project information including estimated site grades was not available at the time this report was nrenared_ 2.2 Scope of Work The conclusions and recommendations contained in this report are based on the results of the following: • Ten Standard Penetration Test (SPT) borings, ■ Survey of as drilled locations; • Results of select laboratory index property testing; • Visual classification of the samples obtained during our field exploration, and • Engineering analyses of the field findings with respect to the provided project information 2.3 Purposes of Exploration The purpose of this exploration program was to determine the soil and groundwater conditions at the site and to develop engineering recommendations to assist in the design and construction of the proposed project. We accomplished these objectives as follows: • Performing a site reconnaissance to evaluate the existing site conditions, • Performing borings to explore the subsurface soil and groundwater conditions, and • Analyzing the field data to develop appropriate geotechnical engineering design and construction recommendations. 3.0 EXPLORATION PROCEDURES 2 Report of Subsurface Exploration and Geotechnical Engineering Analysis NCANG — Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No.: 22.24922 3.1 Subsurface Exploration Procedures 3.1.1 Soil Test Borings The ten soil test borings (B-1 through B-10) drilled on the site were performed using a CME 45- C trailer drill rig utilizing various cutting bits to advance the boreholes. Mud rotary drilling was utilized to advance the borings. Representative soil samples were obtained by means of the split -barrel sampling procedure in general conformance with ASTM D-1586. In this procedure, a 2-inch O.D., split -barrel sampler is driven into the soil a distance of 18 inches by a 140-pound hammer falling 30 inches. The number of blows required to drive the sampler through a 12- inch interval is termed the Standard Penetration Test (SPT) value and is indicated for each sample on the boring logs in Appendix B. The locations of the soil test borings, shown in Appendix A, were determined by Jacobs GBNA. The soil test borings were located in the field using a handheld Trimble GEO7x GPS unit and referencing existing site features. After the completion of drilling, the boring locations were surveyed by Robert H. Goslee & Associates, PA. The elevations and the northing and eastings are shown on the boring logs in Appendix B. Please note the northings and easting are in US Survey feet using the NAD 83/2011 State Plane coordinate system. The SPT value can be used as a qualitative indication of the in -place relative density of cohesionless soils. In a less reliable way, it also indicates the consistency of cohesive soils. This indication is qualitative, since many factors can affect the standard penetration resistance value (i.e., differences between drill crews, drill rigs, drilling procedures, and hammer -rod - sampler assemblies) and preclude a direct correlation between SPT resistance value, or N- Value, and the consistency or relative density of the tested soil. Split -spoon samples were obtained at approximately 5-foot intervals. The approximate locations of the soil test borings are indicated on the Exploration Location Diagram in Appendix A of this report. ECS maintained field logs of the soils encountered in the borings. After recovery, each sample was removed from the sampler and visually classified. Representative portions of each soil sample were then sealed in air -tight containers and brought to our laboratory in Wilmington, North Carolina for visual examination and formal classification by a geotechnical engineer in general accordance with the Unified Soil Classification System guidelines. The soil samples collected for this exploration will be retained at our laboratory for a period of sixty days, after which they will be discarded unless other instructions are received as to their disposition. 3 Report of Subsurface Exploration and Geotechnical Engineering Analysis NCANG — Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No.: 22.24922 3.2 Laboratory Testing Program Representative soil samples obtained from soil test borings were selected and tested in our laboratory to check field classifications and to determine pertinent engineering properties. The laboratory testing program included: • visual classifications of soils according to ASTM D 2487; index property testing included moisture content (ASTM 4959), grain size analyses (ASTM D 1140), Atterberg limits (ASTM D 4318), a standard Proctor compaction test (ASTM D 698), and a CBR test (ASTM D 1883). Data obtained from the laboratory tests are included in Section 4.5 and on the Laboratory Testing Summary Sheet in Appendix C of this report. 4 Report of Subsurface Exploration and Geotechnical Engineering Analysis NCANG — Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No.: 22.24922 4.0 EXPLORATION RESULTS 4.1 Site Conditions This report contains the results of our subsurface exploration and geotechnical engineering analysis for the proposed site located at 2412 Infantry Road in Wilmington, New Hanover County, North Carolina. At the time of our exploration, the site consisted of the existing armory building bored by infantry road on the west, a parking lot on the north, a gravel drive on the east, and a retention pond south of the building. North of existing armory building, an embankment with a height of approximately 2 feet leads to a relatively open grass area with a basketball court on the east side of the raised area. The north portion of the site is moderately wooded. At the time of our site visit, a retention pond is located south of the existing armory building. A relatively new parking lot is located on the southwest portion of the site. A concrete spillway is located in between the two parking lots. At the time of our field visit, water was ponding in between the two parking lots that are west of Infantry Road and in the ditch area between the embankment and existing building. 4.2 Regional Geology The site is located in the Coastal Plain Physiographic Province of North Carolina. The Coastal Plain is composed of seven terraces, each representing a former level of the Atlantic Ocean. Soils in this area generally consist of sedimentary materials transported from other areas by the ocean or rivers. These deposits vary in thickness from a thin veneer along the western edge of the region to more than 10,000 feet near the coast. The sedimentary deposits of the Coastal Plain rest upon consolidated rocks similar to those underlying the Piedmont and Mountain Physiographic Provinces. In general, shallow unconfined groundwater movement within the overlying soils is largely controlled by topographic gradients. Recharge occurs primarily by infiltration along higher elevations and typically discharges into streams or other surface water bodies. The elevation of the shallow water table is transient and can vary greatly with seasonal fluctuations in precipitation. 4.3 Soil Conditions At the surface, approximately 3 to 6 inches of topsoil was reported by the drillers at boring locations B-1, and B-5 through B-10. Boring B-2 consisted of approximately 4 inches of gravel at the surface. Borings B-3 and B-4 consisted of approximately 5 inches of asphalt with a thin layer of concrete coating at boring B-3. Beneath the surface material to a depth of approximately 15 feet, the borings typically encountered intermittent layers of very loose to dense, silty and clean sands (SM, SP) and very soft to medium stiff, sandy lean clay and sandy fat clay (CL, CH). Standard Penetration Test resistance values (N-values) in these soils ranged from W.O.H. (Weight of Hammer) to 38 blows per foot (bpf). 5 Report of Subsurface Exploration and Geotechnical Engineering Analysis NCANG — Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No.: 22.24922 From a depth of 15 to a depth of approximately 32 feet, borings B-1 through B-8 typically encountered intermittent layers of very loose to dense, sands (SP) and very soft to stiff, sandy clay (CL) and medium stiff, organic soils (OL/OH). The N-values in these soils ranged from W.O.H. to 35 bpf. From a depth of 32 feet to a depth of approximately 40 feet, borings B-1 through B-8 typically encountered intermittent layers of medium dense to dense clean sands (SP) and hard sandy silt (ML) with cemented layers. The N-values in these soils ranged from 11 to 50 blows per foot (bpf). From a depth of 40 feet to a refusal depth of 64.6, Boring B-8 consisted of medium dense, silty fine sand (SM), and very stiff to hard, sandy silt (ML) with cemented layers. The N-values in these soils ranged from 15 to in excess of 100 blows per foot (bpf). The descriptions provided in this section are a general summary of the subsurface conditions encountered within the soil test borings. The Soil Test Boring Logs in Appendix B contain detailed information recorded at each of the boring locations. 4.4 Groundwater Conditions Groundwater measurements were made at the boring locations during exploration. Stabilized groundwater readings after 24 hours ranged from about 5.6 to 13.5 feet below the existing grade at the boring locations. The highest groundwater observations are normally encountered in the late winter and early spring. Variations in the location of the long-term water table may occur as a result of changes in precipitation, evaporation, surface water runoff, and other factors not immediately apparent at the time of this exploration. If long term water levels are crucial to the development of this site, it would be prudent to verify water levels with the use of perforated pipes or piezometers. 4.5 Laboratory Test Results Index and engineering properties tests were performed on select samples of the sample soils encountered within the test borings. The samples tested for moisture content ranged from 16.7 to 27.5 percent. The samples tested for grain size analysis showed 37.6 to 43.1 percent by weight passing the number 200 sieve. The samples tested for Atterberg limits showed liquid limits ranging from 34 to 54, plastic limits ranging from 18 to 21, and plasticity indices ranging from 13 to 33. The bulk sample tested showed an optimum moisture content of 13.1% and a maximum density of 113.2 pcf and the CBR value for 0.10 inch penetration is 24.0%. Specific laboratory test results are provided in the Laboratory Testing Summary and in Appendix C of this report. 6 Report of Subsurface Exploration and Geotechnical Engineering Analysis NCANG — Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No.: 22.24922 5.0 ANALYSIS AND RECOMMENDATIONS The recommendations provided in this report are based upon our understanding of the proposed construction, the information provided to us during this exploration and our past experience with similar conditions. Should any of the information provided to us be changed prior to final design, ECS should be notified to review these recommendations and make appropriate revisions, if necessary. 5.1 Subgrade PreRaration The first step in preparing the site for the proposed construction should be to remove vegetation, rootmat, topsoil, existing footings, existing utilities, deleterious materials, and other soft or unsuitable materials from the existing ground surface. These operations should extend at least 10 feet, where possible, beyond the planned limits of the proposed building and pavements. It is important to note that the natural geology at the site has been modified in the past. Therefore, potential fill and unsuitable materials may be present at the site. After proper clearing, stripping, grubbing, further evaluation of the site soil and prior to fill placement, foundation, slab, or pavement construction, the exposed subgrade soils should be evaluated by an experienced geotechnical engineer to identify localized unstable or otherwise unsuitable materials. After evaluating the exposed soils, proofrolling using a heavy smooth drum roller, having a weight of at least 10 tons, is suggested to be used at this time to aid in identifying localized soft or unsuitable material which should be removed. Vibratory action should not be performed next to the adjacent building. Soft or unsuitable materials identified during proofrolling operations should be either repaired in -place or removed and replaced with an approved backfill placed and compacted in accordance with recommendations of this report. Due to the presence of near surface loose sands and soft clays, in -place compaction or undercutting should be anticipated in the vicinity of borings B-1 through B-8 to depths ranging from approximately 3 to 5 feet. Due to near surface clay having a PI above 20, undercutting to a depth of up to 3 feet should be anticipated in the general location of boring B-10 for pavement construction. Site subgrade conditions will be significantly influenced by weather conditions. Subgrades that are evaluated after periods of rainfall will not respond as well to proofrolling as subgrades that are evaluated after periods of more favorable weather. We strongly recommend that rubber tire equipment not be used if subgrade conditions exhibit elevated moisture conditions. The contractor should use tracked equipment to minimize the degradation of marginally stable subgrades. The preparation of fill subgrades, as well as proposed building subgrades, should be observed on a full-time basis by ECS personnel. These observations should be performed by an experienced geotechnical engineer or qualified person to ensure that unsuitable materials have been removed and that the prepared subgrade meets project requirements for support of the proposed construction and/or fills. Report of Subsurface Exploration and Geotechnical Engineering Analysis NCANG — Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No.: 22.24922 5.2 Enaineered Fill Placement Following the removal of deleterious surface and subsurface materials, and after achieving a stable subgrade, engineered fills can be placed and compacted to achieve the desired site grades. Fill for support of the proposed construction and for backfill of utility lines within expanded building and pavement limits should consist of an approved material, free of organic matter and debris and cobbles greater than 3 inches, less than 35 percent fines passing the #200 sieve, and have a Liquid Limit (LL) and Plasticity Index (PI) less than 35 and 9, respectively. We also recommend that fills within structural areas have a standard Proctor (ASTM D 698) maximum dry density of at least 100 pounds per cubic foot (pcf). Materials that should not be used as engineered fill include topsoil, organic materials (OH, OL), and high plasticity clays and silts (CH, MH). Such materials removed during grading operations should be either stockpiled for later use in landscape fills, or placed in approved on or off -site disposal areas. Existing soils containing significant amounts of organic matter will not be adequate for re -use as engineered fill. As such, the organic content of the near surface soils should be evaluated to determine if some of these soils will be adequate for re -use as engineered fill. Natural fine- grained soils classified as clays or silts (CL, ML) should generally not be considered for use as engineered fill, but may be evaluated by the geotechnical engineer to determine their suitability at the contractor's request. Prior to the commencement of fill operations and/or utilization of off -site borrow materials, the contractor should provide representative samples of the proposed fill soils to the geotechnical engineer. The geotechnical engineer can determine the material's suitability for use as an engineered fill and develop moisture -density relationships in accordance with the recommendations provided herein. Samples should be provided to the geotechnical engineer at least 3 to 5 days prior to their use in the field to allow for the appropriate laboratory testing to be performed. Fill materials placed within the building and pavement areas should be placed in lifts not exceeding 8 inches in loose lift thickness and moisture conditioned to within their working range of optimum moisture content. The fills should then be compacted to a minimum of 98 percent of the soil's standard Proctor (ASTM D 698) maximum dry density. The typical working range of optimum moisture for the natural Coastal Plain soils at the site is expected to be within approximately 3 percent of the optimum moisture content. Care should also be taken to provide a smooth, gently sloping ground surface at the end of each day's earthwork activities to help reduce the potential for ponding and absorption of surface water. Grade controls should also be maintained throughout the filling operations. Filling operations should be observed on a full-time basis by qualified ECS personnel to determine that the required degrees of compaction are being achieved. We recommend that a minimum of one compaction test per 2,500-square-foot area be performed for each lift of controlled fill. The elevation and location of the tests should be clearly identified at the time of fill placement. Areas which fail to achieve the required degree of compaction should be re -worked until the specified degree of compaction is achieved. Failing test areas may require moisture adjustments or other remedial activities in order to achieve the required compaction. 8 Report of Subsurface Exploration and Geotechnical Engineering Analysis NCANG — Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No.: 22.24922 Fill materials should not be placed on frozen, frost -heaved, and/or soils which have been recently subjected to precipitation. Wet or frozen soils should be removed prior to the continuation of site grading and fill placement. Borrow fill materials, if required, should not contain excessively wet or frozen materials at the time of placement. Additionally, if grading operations occur during the winter months, frost -heaved soils should be removed prior to placement of engineered fill, granular sub -base materials, foundation or slab concrete, and asphalt pavement materials. If problems are encountered during the site grading operations, or if the actual site conditions differ from those encountered during our subsurface exploration, the geotechnical engineer should be notified immediately. 5.3 Foundations Recommendations Provided the subgrade preparation and earthwork operations are completed in strict accordance with the recommendations of this report, the proposed building can be supported on conventional shallow foundations bearing on approved natural materials and/or properly compacted fill. We recommended a maximum net allowable design soil bearing pressure of 1,500 psf for proportioning continuous and isolated column footings for the proposed building. Due to the presence of near surface loose sands and soft clays, in -place compaction or undercutting should be anticipated in the vicinity of borings B-1 through B-8 to depths ranging from approximately 3 to 5 feet. To reduce the possibility of foundation bearing failure and excessive settlement due to local shear or "punching" failures, we recommend that continuous footings have a minimum width of 18 inches and that isolated column footings have a minimum lateral dimension of 30 inches. Furthermore, footings should bear at a depth to provide adequate frost cover protection. For this region, we recommend the bearing elevation be a minimum depth of 12 inches below the finished exterior grade or in accordance with the local building code requirements. The net allowable soil bearing pressure refers to that pressure which may be transmitted to the foundation bearing soils in excess of the final minimum surrounding overburden pressure. The final footing elevation should be evaluated by ECS personnel to verify that the bearing soils are capable of supporting the recommended net allowable bearing pressure and suitable for foundation construction. These evaluations should include visual observations, hand rod probing, and dynamic cone penetrometer (ASTM STP 399) testing, or other methods deemed appropriate by the geotechnical engineer at the time of construction, in each column footing excavation and at intervals not greater than 50 feet in continuous footing excavations. Due to the presence of loose near surface sands and soft clays in the proposed building area, in -place densification and undercutting of the footing subgrade soils should be anticipated. The settlement of a structure is a function of the compressibility of the bearing materials, bearing pressure, actual structural loads, fill depths, and the bearing elevation of footings with respect to the final ground surface elevation. Estimates of settlement for foundations bearing on engineered or non -engineered fills are strongly dependent on the quality of fill placed. Factors which may affect the quality of fill include maximum loose lift thickness of the fills placed and the amount of compactive effort placed on each lift. Provided the recommendations outlined in this report are strictly adhered to, we expect that total settlements for the proposed construction are expected to be in the range of 1 inch or less, while the differential settlement will be approximately 1/2 of the anticipated total settlement. This evaluation is based on our Report of Subsurface Exploration and Geotechnical Engineering Analysis NCANG — Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No.: 22.24922 engineering experience and anticipated structural loadings for these types of structures, and is intended to aid the structural engineer with his design. 5.4 Floor Slab Design Provided a suitable subgrade will be prepared as recommended herein, ground level slabs can be designed as slabs -on -grade. Our findings indicate that a modulus of subgrade reaction (ks) of 125 pci is appropriate for design provided that the upper 12 inches of the slab subgrade soils have been uniformly compacted to at least 98 percent of their standard Proctor maximum dry density and are unyielding during proofrolling. We recommend that slabs -on -grade be isolated from the foundations so that potential differential settlement of the structure will not induce shear stresses in the floor slab. Also, to minimize the crack width of shrinkage cracks that may develop near the surface of the slab, wire mesh reinforcement may be included in the slab design. The mesh should be located in the top third of the slab to be effective. We also recommend that slabs -on -grade be underlain by a minimum of 6 inches of open graded aggregate to help prevent the capillary rise of subsurface moisture from adversely affecting the slab. If open graded aggregate is not available, clean sand with less than 3 percent fines can be used provided the placement and compaction of the sand complies with the above recommendations. If floor covering such as tile or carpet will be utilized for interior finishes, a polyethylene vapor barrier may be used beneath the floor slab for moisture control considerations. 5.5 Seismic Site Class Determination and Liquefaction Potential The recommendations in this section are in accordance with the 2015 International Building Code (IBC). The seismic Site Class for the site was determined by calculating a weighted average of the N-values of the overburden to a refusal depth of 64.1 feet. The method for determining the weighted average value is presented in Chapter 20 of ASCE 7. The weighted average value for the site is 20.4 bpf. Based on the results of the SPT borings and our evaluation of the site, the site shall be assigned a seismic class "D". Based on the IBC 2015 and Section 11.4.7 of ASCE 7, for a seismic site class "D" at latitude 34.2635° and longitude-77.89240, the SpS value is 0.227, and the SDI value is 0.145. The seismic design category depends on the design use of the buildings and should be determined by the structural engineer. The potential for liquefaction at the site is considered low based upon the SPT results and the liquefaction index procedure developed by Iwasaki (1982). Based on our SPT results and our evaluation using a site peak ground acceleration of 0.172, an earthquake event with a magnitude of 7.3 and procedures developed by Idriss/Seed, the liquefaction induced settlement at the subject site is estimated to be approximately 0.5 to 1.5 inches. 10 Report of Subsurface Exploration and Geotechnical Engineering Analysis NCANG — Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No.: 22.24922 5.6 Pavement Design Considerations For the design and construction or exterior pavements, the subgrades should be prepared in strict accordance with the recommendations in the "Subgrade Preparation" and "Engineered Fill Placement' sections of this report. An important consideration with the design and construction of pavements is surface and subsurface drainage. Where standing water develops, either on the pavement surface or within the base course layer, softening of the subgrade and other problems related to the deterioration of the pavement can be expected. Furthermore, good drainage should minimize the possibility of the subgrade materials becoming saturated during the normal service period of the pavement. Based on assumed traffic loads and the soil conditions encountered during our exploration, a light duty flexible pavement section may consist of the of at least 2 inches of surface mix (SF9.5A) asphalt overlying at least 6 inches of compacted crushed stone. Similarly, a heavy duty, flexible pavement section may consist of at least 3 inches of surface mix (SF9.5A) asphalt overlying 8 inches of compacted crushed stone. For a rigid pavement section, we recommend 6 inches of 4,000 psi flexible strength concrete overlying at least 4 inches of compacted crushed stone in roadway areas. Due to near surface clay having a PI above 20, undercutting to a depth of up to 3 feet should be anticipated in the general location of boring B-10 for pavement construction. Aggregate base course materials beneath pavements should be compacted to at least 98 percent of their modified Proctor maximum dry density (ASTM D 1557). N Regardless of the section selected and type of construction utilized, saturation of the subgrade materials and asphalt pavement areas results in a softening of the subgrade material and shortened life span for the pavement. Therefore, we recommend that both the surface and subsurface materials for the pavement be properly graded to enhance surface and subgrade drainage. By quickly removing surface and subsurface water, softening of the subgrade can be reduced and the performance of the parking area can be improved. Site preparation for the parking areas should be similar to that for the building area including stripping, proofroiling, and the placement of compacted structural fill. Please note that large, front -loading trash dumpsters frequently impose concentrated front - wheel loads on pavements during loading. This type of loading typically results in rutting of bituminous pavements and ultimately pavement failures and costly repairs. Consequently, we recommend the use of an 8 inch thick, mesh or fiber reinforced concrete slab that extends the entire length of the truck. Concrete pavements should be properly jointed and reinforced as needed to help reduce the potential for cracking and to permit proper load transfer. 11 Report of Subsurface Exploration and Geotechnical Engineering Analysis NCANG — Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No.: 22.24922 5.7 Site Drainaae Positive drainage should be provided around the perimeter of the structure to help minimize the potential for moisture infiltration into the foundation and slab subgrade soils. We recommend that landscaped areas adjacent to these structures be sloped away from the construction and maintain a fall of at least 6 inches for the first 10 feet outward from the structures. Roof water should be discharged directly into below -grade stormwater piping or be directed a sufficient distance away from the building with downspouts. The parking lots, sidewalks, and other paved areas should also be sloped to divert surface water away from the proposed building. The proper diversion of surface water during site grading and construction will help reduce the potential for delays associated with periods of inclement weather. The proper diversion of surface water is especially critical since portions of the site soils are expected to be moisture sensitive. Based upon our past experience, the use of "crowning" large areas of exposed soils should be useful to help divert surface water from the prepared subgrades. 5.8 Construction Considerations Exposure to the environment may weaken the soils at the foundation bearing elevation if the foundation excavations remain exposed during periods of inclement weather. Therefore, foundation concrete should be placed the same day that proper excavation is achieved and the design bearing pressure verified. If the bearing soils area softened by surface water absorption or exposure to the environment, the softened soils must be removed from the foundation excavation bottom immediately prior to placement of concrete. If the excavation must remain open overnight, or if inclement weather becomes imminent while the bearing soils are exposed, we recommend that a 2 to 3 inch thick "mud -mat" of "lean" concrete be placed over the exposed bearing soils before the placement of reinforcing steel. It is imperative to maintain good site drainage during earthwork operations to help maintain the integrity of the surface soils. The surface of the site should be kept properly graded to enhance drainage of surface water away from the proposed construction areas during the earthwork phase of this project. We recommend that surface drainage be diverted away from the proposed building and pavements areas without significantly interrupting its flow. Other practices would involve sealing the exposed soils daily with a smooth -drum roller at the end of the day's work to reduce the potential for infiltration of surface water into the exposed soils. 'rhe key to minimizing disturbance problems with the soils is to have a proper earthwork operations plan. Specifically, it should be the earthwork contractor's responsibility to maintain the site soils within a workable moisture content range to obtain the required in -place density and maintain a durable subgrade. Scarifying and drying operations should be included in the contractor's price and not be considered an extra to the contract. In addition, construction equipment cannot be permitted to travel across the site, especially once the desired final grades have been established. Construction equipment should be limited to designated lanes and areas, especially during wet periods to minimize disturbance of the site subgrades. It will likely be necessary to utilize tracked equipment during grading operations particularly if the subgrade soils exhibit elevated moisture conditions. 12 Report of Subsurface Exploration and Geotechnical Engineering Analysis NCANG — Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No.: 22.24922 6.0 CLOSING Our geotechnical analysis of the site has been based on our understanding of the site, the project information provided to us, and the data obtained during our exploration. The general subsurface conditions utilized in our analysis have been based on interpolation of subsurface data between the borings. If the project information provided to us is changed, please contact us so that our recommendations can be reviewed and appropriate revisions provided, if necessary. The discovery of site or subsurface conditions during construction which deviate from the data outlined in this exploration should be reported to us for our review, evaluation and revision of our recommendations, if necessary. The assessment of site environmental conditions for the presence of pollutants in the soil and groundwater of the site is beyond the scope of this geotechnical exploration. 13 APPENDICES APPENDIX A FIGURES Service Layer Credits: Esri, HE eLorme, Mapmylndia, ® OpenStreetMap contributors V377E ft! n. E Iw�13f34 7 Tp'ry N W E 1rdi�f(1c7:1t (}p C.�CSxs'075 L) Cmkbl- ftftolF D 370 740 1,480 2,220 2,960 ftwml ft SITE LOCATION DIAGRAM NCANG - READINESS CENTER ENGINEER WEG SCALE 1 " = 1,500 ' PROJECT NO. 22:24922 SHEET 1 OF 2 DATE WILMINGTON, NC I 12/28/2016 I z 0 Z - Y I Z 0 m 0 v si� �-q zo � z Cl) 0 MOR m G) Z ;i I ;u E r rD Q S (n N � DW c co CD cQ 03 0 oCD r ,� r��„• .= N j »•;ter' � � q w ro 0 D m 0 D G o m m m m z Q N s � csi N N N N ap N N II n co Ol p NQ rn N z Depth 6n Feet ONE o O Z m m o A€ In n> H �Zg NW ®j® ZIgz m�0 m z ni o m Z ®� Z v 0 00 ca N O m �cgn= m�z m C co MOM R � r 4 LR k D 700 o 0 7° co fa co co BUM $ P $ P D z r a �^ o Z- Lq- m� o m �, a c r r - ■�l I-. ma� v f-i*o C3 Cl) z th fT1 7 n� z n 4- .• �. m 1 A 2 aci m g CL Q � -n 4aa� ui y+daQ 0 0 0 0 0 z 1 A (h AO - O _z c m z p c A .i c� A rn -+ :.....:.... -O .... ..... . .. . .. . ..... ........ ........ .. � N -o n r N (� N m z ZNO Or NO � O O x m z � O coW ,II N �...:.....:..:. .. .. .. . .. .. .. ... . m � w aWi w � ro 1, I � •� � A � gQ z N � v � � O m z � N � N A v ON4 I co O A A O O .. .. .. . .. .. .. .. . ............ � C � r � O O s = " �, o Depth in Feet o Q,. �Zmm N�ZN o o y v � � a p o s ozc H -r } ::� ... ►; to to m nmz' z mz 1 Z H C7 a rn m N o T n 1 c— s i v i o ii ;=, rn Cr F r H 3 � � fir. #p F. m �■ o �. n An r.L v I� *° y � !A 3 a) Cl) 10 C ® z-. D �z n H , m rim :° °. O ;g ® v m 433J ui 44da® rn z 0 V N N � 'p W � r N 70 W LT � Q�1 W I � � W I� O N N i19 o . N W � N � m z _ i� V Al N W -o r z I O APPENDIX B BORING LOGS VI UNIFIED SOIL CLASSIFICATION SYSTEM (ASTM D 2487) Major Divisions Group Symbols Typical Names Laboratory Classification Criteria y Well -graded gravels, gravel - a c GW sand mixtures, little or no fines C = Dw/D,o greater than 4 Mn ` o C� _ (Dao)2l(D,oxDao) between 1 and 3 C 0 C o m `o Qj Poorly graded gravels, gravel- .2 J GP sand mixtures, little or no fines S Not meeting all gradation requirements for GW ° m CJ12 rn w to y I ° 0 a N N co v 0 0 _ ° d c°) CD w Z N c t m E GMa Silty gravels, gravel -sand Atterberg limits below "A" line t CoN mixtures t� or P.I. less than 4 Above "A" line with P.I. w rn 3 T a) u v, aN between 4 and 7 are > .� O o borderline cases requiring a o use of dual symbols S GC Clayey gravels, gravel -sand- > N Atterberg limits below "A" line clay mixtures W M or P.I. less than 7 p a`) rn SW Well -graded sands, gravelly c M E C" = D6o/D10 greater than 6 sands, little or no fines 8 ° m C. = (Dao)Z/(D,oxD6o) between 1 and 3 I y w C C p d U m m o V) ° N i 10 SP Poorly graded sands, gravelly En'0i Not meeting all gradation requirements for SW sands, little or no fines °' i 12 N 5, w m i coma oZ d C rn (D(Dm rn = r s y c SMa Silty sands, sand -silt mixtures a a) y Atterberg limits above "A" line m �, ,� E t m N a. a o Q; or P.I. less than 4 Limits plotting in CL-ML ' w m 3 `~ u 4) c o n° c ° zone with P.I. between 4 N ca �' u, and 7 are borderline cases ��a m o requiring use of dual Q SC Clayey sands, sand -clay c w w w C4 0) w N 2 Atterberg limits above "A" line symbols mixtures 0 0 , J 0-2 with P.I. greater than 7 Inorganic silts and very fine ML sands, rock flour, silty or y C clayey fine sands, or clayey CU m silts with slight plasticity Inorganic clays of low to w CL medium plasticity, gravelly v, clays, sandy clays, silty clays, in lean clays Organic silts and organic silty OL clays of low plasticity Inorganic silts, micaceous or MH diatomaceous fine sandy or silty soils, elastic silts T a3 � U +J B CH Inorganic clays of high Ca O plasticity, fat clays .4 (n a H OH Organic clays of medium to Z- high plasticity, organic sifts 60 50 a�i 40 a 30 U a 20 10 0 Plasticity Chart "A" line CH CL H ano OH LTT79= J�� L an I JOL - i It 2 0 10 20 30 40 50 60 70 80 90 100 a L m N r — Liquidrn N Pt Peat and other highly organic Limit = O soils —_ Division of GM and SM groups into subdivisions of d and u are for roads and airfields only. Subdivision is based on Atterberg limits; suffix d used when L.L. is 28 or less and the P.I. is 6 or less; the suffix u used when L.L. is greater than 28. b Borderline classifications, used for soils possessing characteristics of two groups, are designated by combinations of group symbols. For example: GW- GC,well-graded gravel -sand mixture with clay binder. (From Table 2.16 - W interkom and Fang, 1975) REFERENCE NOTES FOR BORING LOGS I. Drilling Sampling Symbols SS Split Spoon Sampler ST Shelby Tube Sampler RC Rock Core, NX, BX, AX PM Pressuremeter DC Dutch Cone Penetrometer RD Rock Bit Drilling BS Bulk Sample of Cuttings PA Power Auger (no sample) HSA Hollow Stem Auger WS Wash sample REC Rock Sample Recovery % RQD Rock Quality Designation % Il. Correlation of Penetration Resistances to Soil Properties Standard Penetration (blows/ft) refers to the blows per foot of a 140 lb. hammer falling 30 inches on a 2-inch OD split -spoon sampler, as specified in ASTM D 1586. The blow count is commonly referred to as the N-value. A. Non -Cohesive Sails (Silt, Sand, Gravel and Combinations) Density Relative Properties 0 to 4 blows/ft Very Loose Adjective Form 12% to 49% 5 to 10 blows/ft Loose With 5% to 12% 11 to 30 blows/ft Medium Dense 31 to 50 blows/ft Dense Over 51 blows/ft Very Dense Particle Size Identification Boulders 12 inches or larger Cobbles 3 inches to 12 inches Gravel Coarse 3/4 inch to 3 inches Fine 4.75 mm to 3/4 inch Sand Coarse 2.00 mm to 4.75 mm Medium 0.425 mm to 2.00 mm Fine 0.075 mm to 0.425 mm Silt and Clay Less than 0.075 mm B. Cohesive Soils (Clay, Silt, and Combinations) Blows/ft Consistency Unconfined Comp. Strength Degree of Plasticity Qp (ts0 Plasticity Index 0 to 2 Very Soft Under 0.25 None to slight 0-4 3 to 4 Soft 0.25-0.49 Slight 5-7 5 to 8 Medium Stiff 0.50-0.99 Medium 8 — 22 9 to 15 Stiff 1.00-1.99 High to Very High Over 22 16 to 30 Very Stiff 2.00-3.99 31 to 50 Hard 4.00-8.00 Over 50 Very Hard Over 8.00 III. Water Level Measurement Symbols WL Water Level BCR Before Casing Removal DCI Dry Cave -In WS While Sampling ACR After Casing Removal WCI Wet Cave -In WD While Drilling V Groundwater Level at Time of Drilling 8 GWT Day After Drilling The water levels are those levels actually measured in the borehole at the times indicated by the symbol. The measurements are relatively reliable when augering, without adding fluids, in a granular soil. In clay and plastic silts, the accurate determination of water levels may require several days for the water level to stabilize. In such cases, additional methods of measurement are generally applied. CLIENT JOB # BORING # SHEET Jacobs GBNA _ 22:24922 13-1 1 OF 2 I PROJECT NAME North Carolina Army National Guard - ARCHITECT -ENGINEER 11 Readiness Center Jacobs GBNA _ __�--��� SITE LOCATION {} CALIBRATED PENETROMETER TONS/FT' 2412 Infantry Rd Wilmin ton New Hanover County, North Carolina ROCK QUALITY DESIGNATION & RECOVERY NORTHING EASTING STATION 12,334 RQD% - —' - REC% �— 188 678.045 532.036 PLASTIC WATER LIQUID LIMIT% CONTENT% LIMIT% X ® STANDARD PENETRATION BLowsrFr o O W a_ U) W W 0- En z W ( Cn z >- x W M DESCRIPTION OF MATERIAL ENGLISH UNITS BOTTOM OF CASING M LOSS OF CIRCULATION r _ P, > a z W W p J p w U) > � LL W io 3 m SURFACE ELEVATION 20.739 To soil Depth 3.0" s 2 3 S-1 SS 18 18 (SM-Fill) SILTY FINE SAND, Gray to Brown, Moist, Very Loose, Brick Fragments at 2.4 feet Obstructed 0 and 24 Hour Measurements l 2 i6 i 2 21 i- — -A-3 4i (CL) SANDY LEAN CLAY, Orange to Gray, MoistSoft , S 2 SS 18 18 5 2 123.8 15 2 2 -6 (CH) SANDY FAT CLAY, Orange to Gray, Moist, Soft S 3 SS 18 18 2 q _ s 35 11 (SP) FINE TO MEDIUM SAND, Orange to Gray, Moist, Medium Dense ': S-4 SS 18 18 10 14 10 (SP) FINE TO MEDIUM SAND, Gray, Moist to Saturated, Medium Dense to Loose S-5 SS 18 18 s ` 7 14 20 15 7 5 8 5 10 -14:: S-6 SS 18 18 20 5 0 (CL) LEAN CLAY, Gray, Saturated, Very Soft, Trace Organic Material S-7 SS 18 18 WOH WO! 25 WOH -5 (SP) FINE TO MEDIUM SAND, Orange to Gray, Saturated, Medium Dense S-8 SS 18 18 6 : i 17 -24; 30 t1 CONTINUED ON NEXT PAGE. THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAY BE GRADUAL. WL WS ❑ WE) ® BORING STARTED 12/13/16 N60 N BLOW COUNT WL(BCR) S WL(ACR) BORING COMPLETED 12/13/16 CAVE IN DEPTH 2.4' on brick WL NM Brick Fragments at 2.4 RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary CLIENT JOB # BORING # SHEET Jacobs GBNA 22:24922 B-1 2 OF 2 OROJECT NAME ARCHITECT -ENGINEER Borth Carolina Army National Guard - Readiness Center Jacobs GBNA SITE LOCATION {}- CALIBRATED PENETROMETER TONS1Fr2 2412 Infantry Rd Wilmin ton New Hanover County North Carolina ROCK QUALITY DESIGNATION & RECOVERY NORTHING EASTING STATION 12,334,532.036 RQD% - — - REC% -- 188 678.045 PLASTIC WATER LIQUID z DESCRIPTION OF MATERIAL ENGLISH UNITS Z J M E LIMIT°% CONTENT% LIMIT°/a Z a_ o }� BOTTOM OF CASING � LOSS OF CIRCULATION � w IL z x� t_ � g _j00 w STANDARD PENETRATION SURFACE ELEVATION 20.739 o ai of U) ¢ 3 L w M BlOWSIFT 30 (SP) FINE TO MEDIUM SAND, Orange to Gray, Saturated, Medium Dense 10 (SP) MEDIUM TO COARSE SAND, Gray, Saturated, Medium Dense S-9 5S 18 18 10 12 3 42 35 18 -15 8 S-10 SS 18 18 6 11 15 40 END OF BORING @ 40' I I 20 45 -25 50 30 55 -35 60 THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAY BE GRADUAL. Q WL WS❑ WD® BORING STARTED 12/13/16 ® N60 N BLOW COUNT WL(BCR) 1 WL(ACR) BORING COMPLETED 12/13/16 CAVE IN DEPTH 2.4' on brick WL NM Brick Fragments at 2.4 RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary CLIENT JOB # BORING # SHEET Jacobs GBNA _ 22:24922 B-2 1 OF 2 PROJECT NAME ARCHITECT -ENGINEER North Carolina Army National Guard - Readiness Center Jacobs GBNA:�. SITE LOCATION {} CALIBRATED PENETROMETER TONwFT2 2412 lnfantry Rd Wilmin ton New Hanover County, North Carolina ROCK QUALITY DES!GNATION & RECOVERY NORTHING EASTING STATION 12,334 188 577.235 642.125 PLASTIC WATER LIQUID z DESCRIPTION OF MATERIAL ENGLISH UNITS w F z x LIMIT% CONTENT% LIMIT% F z (L o BOTTOM OF CASING 3D° LOSS OF CIRCULATION � w w '--' w w w ¢ w 00 J❑ F U)> iv co 19.440 a g g g SURFACE ELEVATION STANDARD PENETRATION w ¢ ❑ ¢ M ¢ cn w Er❑ Ir w m BLOWSIFT Gravel De th 4.0" _ (SM) SILTY FINE SAND, Tan to Brown, Moist, S-1 SS 18 18 Medium Dense = 7 11 -15 4 (SM) SILTY FINE SAND, Orange, Moist, Loose S-2 SS 18 18 15 2 3 6 ;8 5 3 (CH) SANDY FAT CLAY, Orange to Gray, S-3 SS 18 18 Moist, Soft to MediumStiff 1 2 6: �4: 2 2 (SM) SILTY FINE SAND, Trace Gravel, Orange s-4 SS is is 10 2 5 10 to Gray, Moist to Saturated, Loose 3 5 4 2 7 10 S 5 SS 18 18 15 5 (SP) FINE TO MEDIUM SAND, Gray, Saturated, Very Loose 2 6 S-6 SS 18 18 0 2 20 2 I (CL) LEAN CLAY, Gray to Brown, Saturated, Stiff, With Organic Material S-7 SS 18 18 -5 1 2 11 (SP) FINE TO MEDIUM SAND, Gray, 25 9 Saturated, Medium Dense s S-8 SS 18 18 -10 13 23 32 f- 30 t: 10 E CONTINUED ON NEXT PAGE. THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAY BE GRADUAL. WL 1.5 WS❑ WD ® BORING STARTED 12/13/16 F N60 N BLOW COUNT WL(BCR) 1 WL(ACR) BORING COMPLETED 12/13/16 CAVE IN DEPTH WL 13.5' 24 Hrs RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary 'n 35 40 45 50 55 60 na Army National Guard - z DESCRIPTION OF MATERIAL ENGLISH UNITS Z 0 BOTTOM OF CASING ° LOSS OF CIRCULATION x� wW w z a a it ADO w 19.440 M 0 SURFACE ELEVATION N U) (n LL W (SP) FINE TO MEDIUM SAND, Gray, Saturated, Medium Dense S-9 I SS 118 1181101 115 116 SS 18 18 (ML) SANDY SILT, Greenish Gray, Saturated, 20 12 Hard. With Cemented Lavers 38 END OF BORING @ 40' -25 30 35 40 -{} CALIBRATED PENETROMETER TONS.)FT2 ROCK QUALITY DES!GNATION & RECOVERY RQD% - — - REC% PLASTIC WATER LIQUID M1T% CONTENT°! LIMIT% ® STANDARD PENETRATION BLOW&FT THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAY BE GRADUAL. (.. WL 1.5 WS❑ WDS BORING STARTED 12/13/16 (S) N60 N BLOW COUNT WL(BCR) 1 WL(ACR) BORING COMPLETED 12/13/16 CAVE IN DEPTH WL 13.5' 24 Hrs RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary CLIENT Jacobs GBNA JOB # 22:24922 BORING # B-3 SHEET• 1 OF 2 - PROJECT NAME North Carolina Army National Guard - ARCHITECT -ENGINEER Readiness Center Jacobs GBNA SITE LOCATION -LI CALIBRATED PENETROMETER TONS/FT' 2412 lnfantry Rd Wilmin ton New Hanover County, North Carolina ROCK QUALITY DESIGNATION & RECOVERY NORTHING EASTING STATION 12,334,742.777 RQO°ie - — - REC%a --- 188 743.630 PLASTIC WATER LIQUID LVAIT 4, CONTENT% LIMIT% LL a 0 O z W (L � w 0- W g z o W a co z ¢ W OU a: DESCRIPTION OF MATERIAL ENGLISH UNITS BOTTOM OF CASING LOSS OF CIRCULATION D _ w w Z —j O F CO j 3 s w i 3 m �� ® STANDARD PENETRATION BLOWSlFT SURFACE ELEVATION 20.885 As halt Depth 5.0" 1 T 2 11�0 2 2 5 S1 SS 18 18 (SM) SILTY FINE SAND, Orange, Moist, Loose 3 (CL) SANDY LEAN CLAY, Orange to Gray, S-2 SS 18 18 Moist, Medium Stiff 2 2 5 -7 18 — & ^ 5 3 26.9E 15 2 2 3 cT 5 (CH) SANDY FAT CLAY, Orange to Gray, Moist, Soft to Medium Stiff S-3 SS 18 18 10 11 16 15 �'• E a3 (j (SP) FINE TO MEDIUM SAND, Orange to Gray, Moist to Saturated, Dense and Medium Dense S-4 SS 18 18 10 P8 39-.•' T5S 18 18 15 5 i+ 20 9 9 9 i E 18 5 S-6 SS 18 18 0 (OL/OH) ORGANIC SOIL, Brown, Saturated, Medium Stiff 2 5- S-7 SS 18 18 25 -5 3 } (SP) FINE TO MEDIUM SAND, Orange to Gray, Saturated, Medium Dense to Dense 10 13 i41 29 S-8 SS 18 18 30 16 CONTINUED ON NEXT PAGE. THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAYBE GRADUAL. WL 7.8 WS❑ WDI- BORING STARTED 12/14/16 0 N60 N BLOW COUNT WL(BCR) 1 WL(ACR) BORING COMPLETED 12/14/16 CAVE IN DEPTH WL 11.5 24 Hrs RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary JOB # I BORING # I SHEET f tRO o NAME forth Carolina Army National Guard - ncaun iwa vcI uci I Ucu,uua VL11 V!9 a v SITE LOCATION {}- CALIBRATED PENETROMETER TONSIF'C- 2412 Infant Rd V�lilmin tor. New Hanover Coun North Carolina ROCK QUALITY DESIGNATION 8 RECOVERY NORTHING FASTING STATION 12,334,742.777 RqD% - -- A RFC% 188 743.630 PLASTIC VVATER LIQUID Z DESCRIPTION OF MATERIAL ENGLISH UNITS w z _ LL LIMIT$o CONTENT% LIMIT°in OZ ~ 0 BOTTOM OF CASING LOSS OF CIRCULATION F >Lz i O ❑ F `O wIL g 0 SURFACE ELEVATION 20.885 cc ¢ ti W ® STANDARD PENETRATION ❑ va m cn cc� UCH. w m BLOWSlFT 3 (SP) FINE TO MEDIUM SAND, Orange to Gray, '. Saturated, Medium Dense to Dense 10 s-s SS 18 18 35 40 �S-10I SS 118 118 I END OF BORING @ 40' 45 50 55 I 60 -25 -30 -35 12 18 23 41 THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAY BE GRADUAL. WL 7.8 W80 WD ® BORING STARTED 12/14/16 (?,) N80 N BLOW COUNT WL(BCR) 1 WL(ACR) BORING COMPLETED 12/14/16 CAVE IN DEPTH WL 11.5 24 Hrs RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary CLIENT JOB # BORING # SHEET — Jacobs GBNA 22:24922 B-4 1 OF 2 PROJECT NAME North Carolina Army National Guard - ARCHITECT -ENGINEER Readiness Center Jacobs GBNA SITE LOCATION CALIBRATED PENETROMETER TONS/FTz 2412 Infantry Rd Wilmin ton New Hanover County, North Carolina ROCK QUA'.ITY DESIGNAT40N & RECOVERY NORTHING EASTING STATION 12,334,800.26 •- RQD% -- -- REC% 188 711.941 PLASTIC WATER LIQUfO LIMIT% CONTENT% LIMIT% i� W o OZ W & ¢ m W W g ¢ W z F a W § ¢ . z }� W OU W ¢ DESCRIPTION OF MATERIAL ENGLISH UNITS BOTTOM OF CASING " LOSS OF CIRCULATION �O_ E W w Z J 0 F W o w 3 LL w m STANDARD PENETRATION BLOWSIFT SURFACE ELEVATION 20.232 0 Asphalt De th 5.0" _ 2 2 4 19.5 S-1 SS 18 18 (SM) SILTY FINE SAND, Tan to Orange, Moist, Very Loose 1 woH.: WOF..-0 0 (CL) SANDY LEAN CLAY, Orange to Gray, Moist, Very Soft to Medium Stiff S-2 S5 18 18 5 — 15 WOH 2 2 -7 S-3 SS 18 18 3 5 (SP) FINE TO MEDIUM SAND, Orange, Moist S 4 SS 18 is _ to Saturated, Medium Dense 10 $1 10 10 11 22• (SP) FINE SAND, Gray, Saturated, Dense to Medium Dense S-5 SS 18 18 13 17 i 38 53 15 5 21 S-6 SS 18 18 j 5 ,�, `21 20 0 w (CL) LEAN CLAY, Gray, Saturated, Soft, With Organics S-7 SS 18 18 2 2 25 -5 2 4 �. (SP) FINE TO MEDIUM SAND, Gray, Saturated, Dense 6-8 SS 18 18 I 15 32: �q 30I I EE?€: 17 CONTINUED ON NEXT PAGE. THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAY BE GRADUAL. Q WL 4.5 WS❑ WD® BORING STARTED 12/14/16 N60 N BLOW COUNT WL(BCR) WL(ACR) BORING COMPLETED 12/14/16 CAVE IN DEPTH WL 11.8 24 Hrs RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary # Borth Carolina Army National Guard - z DESCRIPTION OF MATERIAL ENGLISH UNITS W Z z EL H o ¢ BOTTOM OF CASING LOSS OF CIRCULATION ZWD WiLL w w W •-j — o io 2�.232 g g g SURFACE ELEVATION W 0 Q (a Q !A Q UJ W Q a 2 J � U. W -I m (SP) FINE TO MEDIUM SAND, Gray, 10 Saturated, Dense (SP) MEDIUM TO COARSE SAND, Orange to Gray, Saturated, Medium Dense S-9 SS 18 18 7935 15 t 101SS118118 40 45 50 55 60 END OF BORING @ 40' -25 -30 SHEET ---- 1' 20F2 J {� CALIBRATED PENETROMETER TON91FT2 ROCK QUALITY DES?GNATION & RECOVERY RQD% - — - REC% PLASTIC WATER LIQUID LIMIT% CONTENT% LIMIT% %�—�� ® STANDARD PENETRATION BLOWSIFT 4 ` THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAY BE GRADUAL. WL 4.5 WS ❑ WD S BORING STARTED 12/14/16 (S) NBO N BLOW COUNT WL(BCR) 1 WL(ACR) BORING COMPLETED 12/14/16 CAVE IN DEPTH WL 11.8 24 HrS RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary CLIENT JOB p BORING # SHEET - Jacobs GBNA 22:24922 B 5 1 OF 2 PROJECT NAME North Carolina Army National Guard - ARCHITECT -ENGINEER Readiness Center Jacobs GBNA SITE LOCATION -C)- CALIBRATED PENETROMETER TONS/FT-' 2412 lnfantry Rd Wilmin ton New Hanover County, North Carolina ROCK QUALITY DESIGNATiON & RECOVERY NORTHING EASTING STATION 12,334 RQD% - — - REC% -- 188 774.680 832.286 PLASTIC VIATER LIQUID z DESCRIPTION OF MATERIAL ENGLISH UNITS w v ? 1 _ E LIMIT% CONTENT% LIMIT% z a_o BOTTOM OF CASING 35 LOSS OF CIRCULATION Uj w w z X LL W W W W J O o 2 2 OV SURFACE ELEVATION 21.494 w ri > 3 ® STANDARD PENETRATION o cn ai Cn ¢ 3 M W m BLOWS/FT To soil De th 6.0" ; 6`•, (SM) SILTY FINE SAND, Orange to Gray, S-1 SS 18 18 Moist, Very Loose to Loose 20 3 2 17.9-0 2 3 2 5 -7 S-2 SS 18 18 5 3 (CH) SANDY FAT CLAY, Orange to Gray, S-3 SS 18 18 Moist, Medium Stiff 15 a .]0 7 49 (SP) FINE TO MEDIUM SAND, Orange to Gray, S-4 SS 18 18 13 1 o Moist to Saturated, Dense to Very Loose 22 35 10 11 13 I i 31 4- S-5 SS 18 18 15 16 5 �r 6 S 6 SS 18 18 6 12' 7 20 6 0 �! I v '6 S 7 SS 18 18 4 2 _4 (CL) LEAN CLAY, Gray, Saturated, Very Soft to 25 2 r Stiff, With Organic Material 1 -5 i 1 5 �� 13 G18 S-8 SS 18 18 SP FINE TO MEDIUM SAND, Orange to Gra , ( ) g 30 Saturated, Medium Dense 8 CONTINUED ON NEXT PAGE. THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAY BE GRADUAL. 4 WL WS❑ WD1M BORING STARTED 12/14/16 N60 N BLOW COUNT WL(BCR) WL(ACR) BORING COMPLETED 12/14/16 CAVE IN DEPTH WL 13.5 24 Hrs RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary CLIENT 1 Carolina Army National Guard - z DESCRIPTION OF MATERIAL ENGLISH UNITS z Ill o ¢ BOTTOM OF CASING' LOSS OF CIRCULATION F w W zo IL tL W w 21.494 g 8 SURFACE ELEVATION w i? (n U) can Q 3 U_ w (SP) FINE TO MEDIUM SAND, Orange to Gray, Saturated, Medium Dense -10 (SP) MEDIUM TO COARSE SAND, Tan to Gray, Saturated, Dense to Medium Dense S-9 SS 18 18 122 35 I -15 a S-10 SS 18 18 12 40 11 END OF BORING @ 40' -2o I 45 50 -25 -35 -& CALIBRATED PENETROMETER TONS/FT? ROCK QUALITY DESIGNATION & RECOVERY ROD% - — -- REC% -- PLASTIC WATER LIQUID LIMIT% CONTENT% LIMIT% ® STANDARD PENETRATION BLOWSIFT THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAY BE GRADUAL. ( WL WS ❑ WD ® BORING STARTED 12/14/16 N80 N BLOW COUNT WL(BCR) 1 WL(ACR) BORING COMPLETED 12/14/16 CAVE IN DEPTH WL 13.5 24 Hrs RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary CLIENT JOB # BORING # SHEET - - -- :-,- o INE Jacobs GBNA PROJECT NAME North Carolina Army National Guard - 22:24922 B-6 1 OF 2 ARCHITECT -ENGINEER Readiness Center Jacobs GBNA " - op SLOCpt AT ITE ION {} CALIBRATED PENETROMETER TONS/FT' 2412 Infantry Rd Wilmington. New Hanover Countv. North Carolina ROCK QUALITY DESIGNATION & RECOVERY NORTHING EASTING STATION 188 802.874 12.334.807.052 RQD°/u - — - REC°h — PLASTIC WATER LIQUID z DESCRIPTION OF MATERIAL ENGLISH UNITS w ? LIMIT% CONTENT% LIMIT% O y BOTTOM OF CASING ` LOSS OF CIRCULATION > d z '----� & STANDARD PENETRATION LL w W a W ¢ W a W w J p 0 W O j io 30 SURFACE ELEVATION 22.054 ❑ cn m o[ 3 LL w m BLOWSIFT p To soil Depth 6.0" -17- 6 (SM) SILTY FINE SAND, Orange to Gray, S-1 SS 18 18 Moist, Very Loose 3 z 16.7 20 2 2 2 6 -4E S-2 SS 18 18 5 2 (CH) SANDY FAT CLAY, Orange to Gray, S-3 SS 18 18 Moist, Medium Stiff 2 15 3 3 6 _ 6 11 3q S-4 SS 18 18 (SP) FINE TO MEDIUM SAND, Orange to Gray, '•. 10 Moist to Saturated, Medium Dense to Very 17 : z$ Loose 10 = 9 13 28 i 3 S-5 SS 18 18 15 15 5 7 6 17 4: S-6 SS 18 18 20 9 0 4 3 6 S-7 SS 18 18 (OL/OH) ORGANIC SOIL, Brown, Saturated, 25 1.'• Soft 4 -5 IS-:8 SS 18 18 SP FINE TO MEDIUM SAND, Orange to Gra , ( ) 9 ,: 4 10 2 '. 30 Saturated, Medium Dense to Dense 12 31-': _•'. CONTINUED ON NEXT PAGE. THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOILTYPES. IN -SITU THE TRANSITION MAY BE GRADUAL Q WL WS ❑ WD ® BORING STARTED 12/15/16 ® N60 N BLOW COUNT WL(BCR) 1 WL(ACR) BORING COMPLETED 12/15/16 CAVE IN DEPTH WL 13.5 24 Hrs RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary CLIENT IJOB # I BORING # I SHEET I �^_s ,, II PROJECT NAME North Carolina Army National Guard - -{} CALIBRATED PENETROMETER TONSrFT2 I 2412 Intantry Rd Wilmin ton . N w Hanover County. North Carolina ROCK QUALITY DESIGNATION & RECOVERY NORTHING FASTING STATION 12,334,807.052 ROD% -- -•-- - REC9k 188 802.874 PLASTIC WATER LIQUID z DESCRIPTION OF MATERIAL ENGLISH UNITS g = LIMIT% CONTENT% LIMIT% c Z o Q BOTTOM OF CASING LOSS OF CIRCULATION W w w SURFACE ELEVATION a_ a. a v F w ® STANDARD PENETRATION ❑ U) U) faq 0 LL W m BLDW^a1FT 30 (SP) FINE TO MEDIUM SAND, Orange to Gray, 't 1 Saturated, Medium Dense to Dense I -10 W®®WR (SP) MEDIUM TO COARSE SAND, Gray, 15 Saturated, Dense 18 S-10 SS 18 18 27 20 40 END OF BORING @ 40' -20 45 -25 50 -30 55 -35 60 THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAY BE GRADUAL. WL WS❑ WD® BORING STARTED 12/15/16 N60 N BLOW COUNT WL(BCR) 1 WL(ACR) BORING COMPLETED 12/15/16 CAVE IN DEPTH WL 13.5 24 Hrs RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary CLIENT JOB # BORING # SHEET Jacobs GBNA 22:24922 13-7 1 OF 2 PROJECT NAME North Carolina Army National Guard - ARCHITECT -ENGINEER Readiness Center Jacobs GBNA SITE LOCATION �} CALIBRATED PENETROMETER TONS/FT'` 2412 Infantry Rd Wilmington. New Hanover County, North Carolina ROCK QUALITY DESIGNATION & RECOVERY NORTHING EASTING STATION 12,334 RQD°k — —• — REC% - 188 885.181 680.446 PLASTIC WATER LIQUID IMIT% CONTENT% LIMIT% LL w ❑ z g ¢ cn w a- ¢ ❑ CL a con z ¢ w rt DESCRIPTION OF MATERIAL ENGLISH UNITS BOTTOM OF CASING E5 LOSS OF CIRCULATION D = F LL w w O J ❑ w cn > 3¢ w ip m ® STANDARD PENETRATION BLOWSIFT SURFACE ELEVATION 22.596 o To soil Depth 4.0" 2 3 s-1 SS 18 18 (SM) SILTY FINE SAND, Orange to Gray, Moist, Very Loose to Loose1 20 2 3 6 8 S-2 SS 18 18 5 3 3 2 -6i (CL) SANDY LEAN CLAY, Orange to Gray, Moist, Soft to Medium Stiff S 3 SS 18 18 10 4 15 2 2 6 s 4 i 1 15 ~6 S-4 SS 18 18 (SP) FINE TO MEDIUM SAND, Gray to Tan, Moist, Medium Dense 10 9 12 28 i 3 S-5 SS 18 18 15 16 5 I B 6 ' y5 '22 S-6 SS 18 18 20 7 YY o (SP) FINE TO MEDIUM SAND, Orange, Moist to Saturated, Very Loose S-7 SS 18 18 2 2 �4 25 2 6; 5 (CL) SANDY LEAN CLAY, Gray, Saturated, Very Soft, Trace Organic Material 1 1 3 S-8 SS 18 18 30 1 CONTINUED ON NEXT PAGE. THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAYBE GRADUAL. WL WS ❑ WD ® BORING STARTED 12/14/16 (1;) N60 N BLOW COUNT WL(BCR) Y WL(ACR) BORING COMPLETED 12/14/16 CAVE IN DEPTH WL 13.0 24 Hrs RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary T JOB # BORING # SHEET obs GBNA F 22:24922 B-7 2OF 2 ECT NAME ARCHITECT -ENGINEER North Carolina Army National Guard - Readiness Center Jacobs GBNA SITE LOCATION -{} CALIBRATED PENETROMETER TONSIFT' 2412 !nfantry Rd Wilmir. ton New Hanover Count North Carolina ROCK QUALITY DESIGNATION & RECOVERY NORTHING FASTING STATION 12,334,680.446 RQD% - --- - REC°�a ----- 188 885.181 PLASTIC WATER LIQUID z DESCRIPTION OF MATERIAL ENGLISH UNITS W " z J = LL LIMIT% CONTENT% LIMIT% Z a. ¢ BOTTOM OF CASING LOSS OF CIRCULATION Uj w w 6d IL a J F Q w ® STANDARD PENETRATION 22.596 8 W SURFACE ELEVATION F o < Cc 3 LL w m BLOWS/FT 30 (CL) SANDY LEAN CLAY, Gray, Saturated, Very Soft, Trace Organic Material -10 (SP) MEDIUM TO COARSE SAND, Tan, Saturated, Dense 10` 45 S-9 SS 18 18 15 i 35 17 32: 1510 1` t (SP) MEDIUM TO COARSE SAND, Orange to Gray, Saturated, Dense } S-10 SS 18 18 12 E 37 5a* 40 25 END OF BORING @ 40' I -20 45 -25 50 -30 55 -35 60 THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAY BE GRADUAL. WL WS ❑ WD S BORING STARTED 12/14/16 (g N60 N BLOW COUNT Z WL(BCR) t WL(ACR) BORING COMPLETED 12/14/16 CAVE IN DEPTH Q WL 13.0 24 Hrs RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary CLIENT JOB # BORING # SHEET _- _� - -.• q Jacobs GBNA 22:24922 B-8 1 OF 3 PROJECT NAME ARCHITECT -ENGINEER North Carolina Army National Guard - Readiness Center Jacobs GBNA SITE LOCATION CALIBRATED PENETROMETER TONSIFV 2412 Infantry Rd Wilmington. New Hanover Count North Carolina ROCK QUALITY DESIGNATION &RECOVERY NORTHING FASTING STATION 12,334 RQD% - — - REC°� 188 735.891 663.279 PLASTIC WATER LIQUID z DESCRIPTION OF MATERIAL ENGLISH UNITS Z LIMIT% CONTENT% WAIT% c z a- o Q BOTTOM OF CASING LOSS OF CIRCULATION � w w Z x ii W W W W 21.195 SURFACE ELEVATION W Q w O I& STANDARD PENETRATION W ❑ a rn a (n a m W cc W_ w m BLONl81FT To soil Depth 4.0" 20 (SM) SILTY FINE SAND, Orange to Gray, S-1 SS 18 18 Moist, Very Loose to Loose 1 4 2 2 3 6 S-2 SS 18 18 5 3 24.5 000 (CH) SANDY FAT CLAY, Orange to Gray, S-3 SS 18 18 Moist, Medium Stiff 15 2 2 - 21 — — — — -A 54 3 5 �` 27.5 — 10 14 !3 45 S-4 SS is 18 (SP) FINE TO MEDIUM SAND, Tan, Moist to 10 Saturated, Dense 19 10 _ (SM) SILTY FINE SAND, Gray, Saturated, Dense 12 S-5 SS 18 18 16 3 46 15 17 5 (SP) FINE TO MEDIUM SAND, Gray, Saturated, Medium Dense 12 S-6 SS 18 18 12 i 27 38 u i 20 15 0 // (OL/OH) ORGANIC SOIL, Brown, Saturated, Medium Stiff 2 S-7 SS 18 18 3 68 25 3 �_`• -5- 1 (SP) FINE TO MEDIUM SAND, Tan to Gray, Saturated, Dense and Medium Dense '. 10 35, 49 S-8 SS 18 18 15 30 20 CONTINUED ON NEXT PAGE. THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAY BE GRADUAL. Q WL 8.5 WS ❑ won BORING STARTED 12/14/16 & N60 N BLOW COUNT WL(BCR) WL(ACR) BORING COMPLETED 12/14/16 CAVE IN DEPTH WL 12.5 24Hrs RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary # ( I PROJECT NAME North Carolina Army National Guard - {}- CALIBRATED PENETROMETER TQNS.+FT` I 2412 lnfantry Rd Wilmin ton New Hanover Countv, North C rolina ROCK QUALITY DESIGNATION & RECOVERY NORTHING FASTING STATION 12,334,663.279 RQp°/a - — - RFC% --- 188 735.891 PLASTIC WATER LIQUID z DESCRIPTION OF MATERIAL ENGLISH UNITS W F z W x LL LIMIT% CONTENT% LIMIT% Z � o BOTTOM OF CASING LOSS OF CIRCULATION w w W J — F F 21.195 g g 8 SURFACE ELEVATION w STANDARD PENETRATION o m r¢n can ¢ ir LL w co BLOWSIFT 30 (SP) FINE TO MEDIUM SAND, Tan to Gray, Saturated, Dense and Medium Dense 10 E®®NE S-101 SS 18 18 40 (SM) SILTY FINE SAND, Greenish Gray, Saturated, Medium Dense MOWN& (ML) SANDY SILT, Greenish Gray, Saturated, Very Stiff to Very Hard, With Cemented Layers 2 SS 18 18 50 S-13 SS 1 18 iS 55 s 12 14 -15 -20 10 8 7 -25 -30 -35 3 3 S-14 SS 18 18 NUF I 28 I 43 r60 60 11 CONTINUED ON NEXT PAGE. THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAYBE GRADUAL. �• Z WL 8.5 WS❑ WD® 80RING STARTED 12/14/16 N60 N BLOW COUNT �� WL(BCR) 1 WL(ACR) BORING COMPLETED 12/14/16 CAVE IN DEPTH WL 12.5 24Hrs RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary CLIENT JOB # North Carolina Army National Guard - Readiness Center z DESCRIPTION OF MATERIAL ENGLISH UNITS Oz o BOTTOM OF CASING LOSS OF CIRCULATION � w w z w w w w -❑ E a a g d d '0 v SURFACE ELEVATION 21.195 ¢ ~ > Ow 3: 3 w ¢ cn ¢ ❑ ¢ m w cc❑ �CCw m 0 (ML) SANDY SILT, Greenish Gray, Saturated, Very Stiff to Very Hard, With Cemented Layers 11111111F40 6 S-15 55 13 13 49 65 LIMESTONE 11 END OF BORING @ 64.6' -45 70 -50 75 -55 80 -60 85 -65 90 -{ j- CALIBRATED PENETROMETER TONS/FT2 ROCK QUALITY DESIGNATION & RECOVERY RQD% - — - REC% PLASTIC WATER LIQUID LIMIT% CONTENT% LIMIT% STANDARD PENETRATION SLOW SIFT 8 THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOILTYPES. IN -SITU THE TRANSITION MAY BE GRADUAL, WL 8.5 WS ❑ WD ® BORING STARTED 12/14/16 ® N60 N BLOW COUNT WL(BCR) WL(ACR) BORING COMPLETED 12/14/16 CAVE IN DEPTH WL 12.5 24Hrs RIG 45C Trailer FOREMAN BF DRILLING METHOD Mud Rotary CLIENT Borth Carolina Army National Guard - 1 c li Z a a- W a z I- a ? > '0 DESCRIPTION OF MATERIAL ENGLISH UNITS BOTTOM OF CASING LOSS OF CIRCULATION co W TZ ILiL 6 z0 w J ¢�a SURFACE ELEVATION 16.031 0 To soil Depth 3.0" 4Z_ (SM) SILTY FINE SAND, Orange to Gray, Moist i to Wet, Loose 15 3 5 5 S-1 SS 18 18 2 S-2 SS 18 18 I 5 a - 10 a (SP) FINE TO MEDIUM SAND, Orange to Gray, Saturated, Loose to Medium Dense s-3 ss 1e 18 6 3 10 S-4 SS 18 18 10 12 (SP) MEDIUM TO COARSE SAND, Gray, Saturated, Loose J S-5 I SS 118 118 I 15 I�r END OF BORING @ 15' 0 20 -5 1 25 -10 30 I *iw i, {}- CALIBRATED PENETROMETER TONS..IFT2 ROCK QUALITY DESIGNATION & RECOVERY RQD%a R — — REC% —.--- PLASTIC WATER LIQUID LIMIT% CONTENT'/o LIMIT°,o X —01 I& STANDARD PENETRATION BLOWSIFT 5 5 1 5 4 4 THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAYBE GRADUAL. [' WL WS ❑ WE) ® BORING STARTED 12/16/16 ® N60 N BLOW COUNT WL(BCR) 1 WL(ACR) BORING COMPLETED 12/15/16 CAVE IN DEPTH WL 5.5 24 firs RIG 45C Trailer FOREMAN BF DRILLING METHOD Wash Rotary CLIENT JOB # BORING # SHEET Jacobs GBNA 22:24922 B-10 1 OF 1 PROJECT NAME North Carolina Army National Guard - ARCHITECT -ENGINEER Readiness Center Jacobs GBNA SITE LOCATION CALIBRATED PENETROMETER TOtiS!FT7 2412 Infantr Rd Wilmin ton New Hanover Count North Carolina ROCK QUALITY DESIGNATION & RECOVERY NORTHING FASTING STATION 12.333 ROD°k - — - REC°ro------ 188 641.802 978.302 PLASTIC WATER LIQUID z DESCRIPTION OF MATERIAL ENGLISH UNITS W IL z = LL LIMIT% CONTENTS; LIMIT% LL } BOTTOM OF CASING LOSS OF CIRCULATION W w z LL Z W W o W W w -� p ct a a a 2 a 2 O v SURFACE ELEVATION 15.278 w > r O ® STANDARD PENETRATION o U)i < cc W ¢ CC � LL W O m BLOWS!FT 0 To soil De th 3.0" t5 (CL) SANDY LEAN CLAY, Orange to Gray, S-1 SS 18 is Moist, Medium Stiff z 3 6 8 20 3 � 25.4 1 i 1 17 8-2 SS 18 18 (SP) FINE TO MEDIUM SAND, Orange to Gray, 5 i Moist to Saturated, Medium Dense to Loose 10 6 9 i 17 24.'• S-3 SS 18 18 8 -_ 4 9 17 -24 S-4 SS 18 18 10 6 5 4 3 6 :8 S-5 SS 18 18 15 3 END OF BORING @ 15' 0 20 -5 25 10 30 THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEN SOIL TYPES. IN -SITU THE TRANSITION MAY BE GRADUAL. WL WS ❑ WD ® BORING STARTED 12/15/16 N60 N BLOW COUNT WL(BCR) Y WL(ACR) BORING COMPLETED 12/15/16 CAVE IN DEPTH WL 8.7 24 Hrs RIG 45C Trailer FOREMAN BF DRILLING METHOD Wash Rotary APPENDIX C LABORATORY TEST RESULTS m m c c ' 0 0 00000007oD00 W W W CD o m E N Cl) Cl) 3 o o w 0)O O m CD � s N n N n ai w 3 G7 co C Cn Cn Cn Cf1 C1J (n Cn, Z N C N m fail a O i W N i ...� i N N f O• .6 rn o m E I fD f N G7 CD N o a - > mCh [ y �--I O 0 0 0 m O c O cn U7 ID n m N W v V N N N U1 (J1 CD "CC D D CSi O CJ7 O C3i CJ1 (St O �I A co O -I - r � w U1 �I A D7 v CO O o m a � i .a. Vt U1 � co in c4 ao v C7 r 3, ca -o r O d n 0CnCnCnCnnn - r cn 3 m r - T a N i 0')p 00 •p r— O a m c m O n cor O 00 i r °a O m �_ ID p ( N W W N O i W u m m m m w Cl) o i �M � c H 0D v W � �D O N Cf p $ i W O _' N O O 3 mm 25.• o O o i (D X „yq 3 3 Ir� v m O N e i O '� C r O �G-04,rrl _. _l ? cn `. 0 N Ci C W O CDO O O i0 m v Z 0) N to N m CO p r 4�, i r CD o CD m O o I I I 9 APPENDIX D CALCULATIONS GENERAL SHEAR SEARING CAPACITY CALCULATION (Rev. 8-23.2010) General Shear only, does not calculate t----- J Local or Punching Shear PROJECT: NCANG Readiness Center ECS JOB NO.:I 24922 DATE: 12/30/2016 PROJ. ENG'R: MME PRINC. ENG'R: WEG Vesic's INPUTS: C = COHESION =0 (PSF) (1) = SOIL FRICTION ANGLE = 28 q (surchage, yDf)= 200 (PSF) q (effec. surch) (when Dw < Df, Case 1) = NeA (PSF) 5 y bar (Case II) = 103 (PSF) 0 Inclination Factor, (i (deg)= 0 (usually 0) y(moist) = SOIL UNIT WT.= 100 (PCF) -/(sat) = SOIL UNIT WT. = 115 (PCF) y(efi) = EFF. SOIL UNIT WT.= Se^.6 (PCF) 7 Df = *DEPTH OF EMBEDMENT = 2 (FT) B = LEAST FT. WIDTH= 12.5 (FT) L= for Rectangular or Square Footings = 12.5 (FT), enter C for cunt. Dw = *DEPTH TO WATER TABLE = 12 (FT) d= dist. between BOF and GWT = 10 (FT), e (-) means subm. Modifications For Water Table, which Case? Case II Shape, Depth, Inclination Factors N, = 25.80 11 Fcd= 1.06 Nq = 14.72 Fqd= Fyd= 1.05 1.00 N i =r 16.72 3 Fcs= Fqs= 1.57 1.53 Fys= 0.60 Fqi= 1.00 Fci= 1.00 Fyi= 1.00 Correlated PHI or Cohesion FROM N-VALUE N60 For Granular Soils 28 Mitchell and Katti (from table) Peck, Hanson, Thornburg (Das Eqn. 2.24) Fur Cohesive (fine grained) soils, undralned shaar s'.rangih c (psi) = K*N60 (Eqn. 2.10, K=91.87 psf) c (psf) = C 276 CALCULATED ULTIMATE CAPACITY: q ult­ cNcFcsFcdFci + (q)(NgFgsFgdFqi) + (0.5)(yBNyF7sF7dFyi) (Das Eqn. 3.23) q ult. (Case I) _ q ult. (Case II) = 11,152 PSF q ult. (Case III) _ Factor of Safety (F.S.)= 3.0 CALCULATED ALLOWABLE CAPACITY: q allowable= 3,717 PSF 10 q allowable (net)=j 3,651 PSF 11 Groundwater table D f .Case I f Dw d Groundwatertable ————— Case J1 y. = saturated unit weight FOOTING Bearing Cap 24922.x1s (c) 2008 ECS Corporate Services, LLC Prininri- 19mnnn+a 11:51 AM a W W F m 0 V A N r) in in in m O O N O 63 I- 1n N A to O N N (n N N 01 F- F+ W W rm O O O O O O O O O m W N N N N W W W N Om V O O O = 7 n W m ONi V N W n a O m 0 r d A O O O 3 V A r+ 0, O N n n N H m "L n Z r - O N N V < O O 3 m v CDc Z r O N m ro 3 0 � < -O < G1 n w V M w A w N N m d O N N 1 m o ° a rim v° c °' 3 N < o o C =rCD V N V W {O O1 W !+ N y w m 0 c oo x m o 3 O O. CNr1 N K 3 O' W N N F+ N V N V W lD O1 W O x 3 r0 3 O c ^ 0 3 is 01 °-' o• a ru wcio ~' N V H 001 OOi V N � In V W W In O 6' N N A 1 01 A V 41 Go Om {Ii O Y+ F+ W N O a a f+ r f+ r N om - a C O Ln ul P. 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Z 00 N 0 003 3 n O N 7 N N O Q fD 7 N N o 3 IM d 3 a r+ 3 K N Ir S N N tr O O O A in N o w d .Oa m mAi a 3 D M 0 ID d F+ 0 00 A 7 n (D ti r v O 2 O Ql Vl A w N F' m ro 5 O N F N 0o In O V m W V1 W n) a m L!nO V Vt 00 VI N F` Ln w 0 W p O N Ln O V N V1 O O w lD cn V A p- m w O V W w c O of r r r r r r Ln Ln Ln L" Lo 0 A W W N V1 (n V W In F` m O N Ln0 V L- N N n W W Ln Ln CD O O O O O O N F W V1 W W N V M W lD 0o A 0o V O V1 M F-+ 00 V V W In A lD N A r ` cn F+ N N Ol lO lD 01 O O 0 0 0 0 0 p 0 0 0 O O O O O O O O In A W w W O w W O D1 W V 00 lD O ut A A ut lD A V O O O O O O = O O O W 1 O N V W W Ln Ln >' O A V N O ut n O j Ol F+ 00 S al LD W N 00 V 00 y� O a 0 Ln Ln 00 in r o m m 0 0 0 Ol 3 W O W Ln 0o Lq �+ O d F f-+ C o r o r+ m rc 00 N F n 0o M Lo w Ul w -* V A V W fV w N V . 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O O O W N J J > > s d 0 m a s N N (n w U)(n(n co U) tp tp CO AC O W O O in O Li 0 0 0 0 o N N N Nin b, V V m o pC) go C) co in N p 0C)mDD o N cn A A m C) D Cn (n (n F co coM5 (n 0 (nU)W mw "'• Z w U) m lD w w Nn W=L N W A •� O � i) C) m N fD m W m m Un O II c c m m ID 0 0 0 0000 ? o CDm m m m c. c c c c ... Ro m 000 mmmmm�m N g N N M (n r w r y g W w or r m [J A O O O^ N O O^ O N N (n A A OAA O O "S O rs 0= 0 w r r W N v m N W W w W W W O O;O am t' O N A ONV) O T Q� T. A N N N N N N NNN N N n n w' a m 0 0 3 a d 0 N N N N N N N N O ZZ mmmCDn nCD7n 8 c O mIS 9 3 $ ff� c n m ia 3 3 m m m o m N m CDm Ui N �y n C. O W �yNa m O OAA w C D c p CiN A 000o A W A � �. Nry n yr ®W C V m c n m m a m � o m r pp pp p coo N 4] A A ZUSGS Design Maps Detailed Report ASCE 7-10 Standard (34.2635°IV, 77.8924°W) Site Class D - "Stiff Soil", Risk Category I/II/III Section 11.4.1 — Mapped Acceleration Parameters Note: Ground motion values provided below are for the direction of maximum horizontal spectral response acceleration. They have been converted from corresponding geometric mean ground motions computed by the USGS by applying factors of 1.1 (to obtain SS) and 1.3 (to obtain SJ. Maps in the 2010 ASCE-7 Standard are provided for Site Class B. Adjustments for other Site Classes a; e made, as needed, in Section 11.4.3. From Figure 22-111.1 Ss = 0.213 g From Figure 22-2121 S,1 0.090 g Section 11.4.2 — Site Class The authority having Jurisdiction (not the USGS), site -specific geotechnic;--:; data, and/or the default has classified the site as Site Class D, based on the'site soil properties in accordance v,.-ith Chapter20. Table 20.3-1 Site Classification Site Class vs Nor Ty. s„ A. Hard Rock >5,000 ft/s N/A N/A B. Rock 2,500 to 5,000 ft/s N/A N/A Very dense soil and soft rock Y s _ 1 200 to 2,500 ft/s >50 >2,000 psf D. Stiff Soil 600 to 1,200 ft/s 1S to 50 1,000 to 2,000 psf E. Soft clay soli <60.0 'fVs <15 <1 000 psf Any profile with more than 10 ft of soil having the characteristics: • Plasticity index PI > 20, • i�'loisture content vb ? 40°Lc, and • Undrained shear strength s,; < 500 psf F. Soils requiring site response See Section 20.3A analysis in accordance with Section 21.1 For :5f.: ift/s = 0,3048 m/s 1lb/ft2 = 0.0479 kN/m2 Section 11.4.3 - Site Coefficients and Risk -Targeted Maximum Considered Earthquake (MCE) Spectral Response Acceleration Parameters Table 11.4-1: Site Coefficient `7. Site Mapped MCE R Spectral Response Acceleration Parameter at Short Class Period S5:50.25 SS=0.50 SS=0.75 S;=1.00 S;>1.25 A 0.8 036 OX 0.8 0.8 B 1.0 1.0 1.0 1.0 C 1.2 1.2 1.1 1.0 1.0 D 1.6 1.4 1.2 1.1 1.0 E 2.5 1.7 1.2 0.9 0.9 F See Section 11.4.7 of ASCE 7 Note: Use straight-line interpolation for intermediate values of Sc For Site Class = D and S3 = 0.213 g, F. = 1.600 R Table 11.4-2: Site Coefficient F. Site. Mapped MCE R Spectral Response Acceleration Parameter at 1-s ClaSS Period S,:50.10 S.Z-0.20 S,=0,30 S1=0.40 S1a0.50 A 0.8 0.8 0.8 0.8 0.8 B 1.0 1.0 1.0 1.0 1.0 C 1.7 1.6 1.5 1.4 1.3 D 2.4 2,0 1.8 1.6 1.5 E 3,F 3.2 2.8 214 2.4 F See Section 11.4.7 of ASCE 7 Note: Use straight-line interpolation for of Sl For Site Class = D and S. = 0.090 g, F„ = 2.400 Equation (11.4-1): SMs -= F,Ss = 1.600 x 0.213 = 0.341 g Equation (11.4-2): SM1 = F„S1 = 2.400 x 0.090 = 0.217 g Section 11.4.4 — Design Spectral Acceleration Parameters Equation (11.4-3): S= % SMs = Z/ x 0.341 = 0.227 g Equation (11.4-4): Sol = % SM>. = Z/ x 0.217 = 0.145 g Section 11.4.5 — Design Response Spectrum From Figure 22-12 [31 Ti = 8 seconds Figure 11.4-1., Design Response Spectrum ! T4To:8,=8D9(O.4+OATITO T,:5TsT.8 _ 1',$ � `1" f T, : S, — SDi I T L ' Yn -5 .,TL. I T, � r 'piCL C Q + r Ta=0.128 -------------------- T;=0._335 1.a ��� Period, T (sec) Section 11.4.6 — Risk -Targeted Maximum Considered Earthquake (MCER) Response Spectrum The MCER Response Spectrum is determined by multiplying the design response spectrum above by 1.5. CA c Q a u� e a a H E}: M yV 4 a a rA T, = 0.127 T; = 0.636 1.000 Period, T (se¢) Section 11.8.3 — Additional Geotechnical Investigation Report Requirements for Seismic Design Categories D through F From Figure 22-7143 PGA = 0.109 Equation (11.8-1): PGAM = FPGAPGA = 1.582 x 0.109 = 0.172 g Table 11.8-1: Site Coefficient FPGA Site Mapped MCE Geometric Mean Peak Ground Acceleration, PGA rl=�� PGA <- PGA = PGA = PGA = 0.10 0.20 0.30 0.40 PGA >: 0.50 A 0.8 0.8 0.8 0.8 0.8 B :1..:4 1.0 1.0 1.0 1.0 C 1.2 1.2 1.1 .0 1.0 D 1.6 1.4 1.2 1.1 1.0 E 2.5 1.7 1.2 0,9 0.9 F See Section 11.4.7 of ASCE 7 Note: Use straight-line i,'iterpolation for intermediate values of PGA For Site Class = D and PGA = 0.109 g, F,,A = 1.582 Section 21.2.1.1 — Method 1 (from Chapter 21 - Site -Specific Ground Motion Procedures for Seismic Design) From Figure 22-17151 �roln Figure 22-18161 CRS = 0.825 CRi = 0.824 •�• �wM. �. r a FAY +° '��' .:yr:• � V•' i_. - . - � �.•.z� _Y:.Vt �_ gyp. Section 11.6 — Seismic Design Category Table 11.6-1 Seismic Design Category Based on Short Period Response Acceleration Parameter VALUE OF Sns RISK CATEGORY I Or IT III IV Sos < 0.167g A A A 0.167g 5 Ss < 0.33g B B C 0.3395 Sos < 0.509 C C D 0.5Og 5 SOS D D D For Risk Category = I and Sos = 0.227 g, Seismic Design Category = 0 Table 11.6-2 Seismic Desion Category Based on 1-S Period Response Acceleration Parameter VALUE OF Sal RISK CATEGORY T or IZ IIT IV Sol < 0.067g A A A 0.067g 5 Sol < 0.133g B B C 0.133g 5 Spl < 0.20g C C D 0.20g 5 Sp1 D D D For Risk Category = I and Sp,. = 0.145 g, Seismic Design Category = C Note: When S, is greater than or equal to 0.75g, the Seismic Design Category is E for buildings in Risk Categories I, II, and III, and F frr those in Risk Category IV, irrespective of the above. Seismic Design Category = "the more severe design category in accordance with Table 11.6-1 or 11.6-2" = C Note: See Section 11.6 for alternative approaches to calculating Seismic Design Category. References 1. Figure 22-1: http.//earthquake.us,_�s,gov/t;azards/designmaps/downloads/pdfs/201G._ ASCE-7—Figur e_22- l.pdf 2. Figure 22-2: http://earthquake.usgs.govlhazards/designmaps/downloads/pdfs/201O_ASCE-7_Figure_22- 2.pdf 3. Fig ure 22-12: http://earthquake.usgs.gov/hazards/designr,iaps/downloads/pdfs/2010,ASCE- 7_Figure_22-12.pdf 4., Figure 22-7: http://earthquake.usgs.gov/hazards/designmaps/downloads/pdfs/2010_ASCE-7_,Figure._.22- 7.pdf 5. Figure 22-17: http://earthquake.usgs.gov/hazards/designmaps/downioads/pdfs/2010_ASCE- 7_.Figu re._22-17.pdf 6. Figure 22-18: http://earthquake.usgs.gov/hazards/designmaps/downloads/pdfs/2010_ASCE- 7_Fig u re _•22-18.pd f • o®®ova©mm�������� ®mm®mmmmo�■�m����� r m®©000®�� ���� �■� rr SIT SOIL PROFILE1 AVERAGE PROPERTIES N TOP 100 ft, AS PER SECTION 1615.1.5 3s = 0.213 E NAME Soil shear wave Standard Penetration Soil Undrained Shear A Hard Rock Vs -bar > 5,000 Not Applicable Not Applicable gt 0.09 B Rack 2,500 <Vs -bar • 5,000 Not Applicable Not Applicable C and Soft Rock 1,200 < Vs -bar • 2,500 N-bar > 50 Su -bar • 2000 F, = 1.5 D Stiff Soil Profit 600 • Vs -bar • 1,200 15 • N-bar • 50 1,000 • Su -bar • 2000 _ E Soft Soil Profile Vs -bar < 600 N-bar < 15 Su -bar < 1,000 Any profile with more than 10 feet of soil having the following characteristics: E I. Plasticity Index, Pl>l0; Sm== 0.3406 — 2. Moisture content, w• 40%,and 3. Undrained shear strength, Su -bar <500 psl S�• .� i:.216 Any pmfrle containing soils having one or more of the following characteristics: 1. Soils vulnerable to potential failure or collapse under seismic loading such as liquellabl soils, quick and highly sensitive clays, collapsible weakly cemented soils. 2. Pests and/or highly organic clays ( H > 10 ft or peat and; or highly organic caly where H = thickness of soil) 3 Very high plasticity clays ( H�-- 25 ft with plasticity index PI> 75) F _ 4. Very thick soft/medium stiff clays (H > 120 ft) Ta = 0.1267605 T,= 0.633802a ae U.Usruao Sa #ohvro! r0.3877835 �w�7r. � .�"�T R;• ice. V }`wy^S�' - ��.! °''�''!�"'Q .AQ ��".�:''-�r✓ij �}w-f1 sYyrt ap ^'S: sS�F•'•; .R`. ..�. �. ► r si..i' �.'stt`1 .L '�y?^"�+:• LIQUEFACTION ANALYSIS NCANG - Readiness Center Hole No.=B-9 Water Depth=93 ft Surface Elev.=20.73 Magnitude=7.3 Acceleration=0. 172g Shear Stress Ratio Factor of Safety Settlement Soil Description (ftJ 0 0 1 0 1 5 0 (in.) 1 r—�Cl r'fTITTTTT'fl f"1TTTTTI—fT—I �-10 I�Zfj F— 30 fs1=1 l0 40 CRR CSR fs Shaded Zone has Liquefaction Potential 50 OR ECS Carolinas, LLP Ow L Wet-- Dry— S=0.82 in. LL.LTYLL Plate A-1 10 Nil 30 MOM 50 LIQUEFACTION ANALYSES NCANG - Readiness Center Hole No.=B-2 Water Depth=13.5 ft Surface Elev.=19.44 Shear Stress Ratio 0 C:SR fc1� Shaded Zone has Liquefaction Potential ECS Carolinas, LLP Factor of Safety Settlement 1 n 1 F nrhi a S = 0.64 in. 22.24922 Magnitude=7.3 Acceleration=0.172g Soil Description Plate A-1 LIQUEFACTION ANALYSIS NCANG o Readiness Center Hole No.=B-3 Water Depth=99.5 ft Surface Elev.=20.88 Magnitude=7.3 Shear Stress Ratio ift 110 — 0 10 20 30 50 Shaded Zone has Liquefaction Potential ECS Carolinas, LLP Factor of Safety Settlement 1 0 1 5 0 (in.) 1 Wet— Dry— S = 0.42 in. 22.24922 Acceleration=0.172g Soil Description Plate A-1 LIQUEFACTION ANALYSIS NCANG - Readiness Center Hole No.=B-4 Water Depth=19.8 ft Surface Elev.=20.23 Shear Stress Ratio F0 0 -10 - 20 - 30 -40 -50 - 60 - 70 Shaded Zone has Liquefaction Potential aECS Carolinas, LLP Factor of Safety Settlement 1 0 1 5 0 (in.1 1 S = 0.76 in. 22.24922 Magnitude=7.3 A ccelera tion =0. 1 72g Soil Description Plate A-1 LIQUEFACTION ANALYSIS NCANG v Readiness Center Hole No.=B-5 Water Depth=13.5 ft Surface Elev.=21.49 Magnitude=7.3 Acceleration=0.172g Shear Stress Ratio Factor of Safety Settlement Soil Description (n)0 0 1 0 1 5 0 (in.) 1 10 `col 30 40 50 L �: CRR — Shaded Zone has Liquefaction Potential aECS Carolinas, LLP Wet— Dry— S = 0.95 in. 22.24922 Plate A-1 LIQUEFACTION A14ALYSIS NCANG - Readiness Center Hole No.=B-6 Water Depth=13.5 ft Surface Elev.=22.05 Shear Stress Ratio �) 0 -0 -10 - 20 - 30 - 40 - 50 - 60 - 70 Shaded Zone has Liquefaction Potential Factor of Safety Settlement 1 0 1 s n tin 1 1 Wet— Dry— S = 0.61 in. Magnitude=7.3 Acceleration=0.172g Soil Description imECS Carolinas, LLP 22.24922 Plate A-1 LIQUEFACTION ANALYSIS NCANG - Readiness Center Hole No.=B-7 Wafer Depth=13 ft Surface Elev.=22.59 Shear Stress Ratio (ft)0 0 10 20 30 40 CRR — CSR fsAmm Shaded Zone has Liquefaction Potential 50 ECS Carolinas, LLP Factor of Safety Settlement 1 0 1 5 0 (in.) 10 Wet— Dry-- S = 1.84 in. 22.24922 Magnitude=7.3 Acceleration=0.972g Soil Description Plate A-1 LIQUEFACTION ANALYSIS NCANG - Readiness Center Hole No.=B-8 Waiter Depth=12.5 ft Surface Elev.=21.19 Shear Stress Ratio (ft)0 0 F- 10 20 30 40 50 E 70 I fS1 r:RR f,, Factor of Safety Settlement 1 0 1 5 0 (in.) 1 Shaded Zone has Liquefaction Potential t = 0.24 in. E ECS Carolinas, LLF 22.24922 Magnitude=7.3 Acceleration =0. 172g Soil Description Plate A-1 APPENDIX E GENERAL CONDITIONS General Conditions The analysis, conclusions, and recommendations submitted in this report are based on the exploration previously outlined and the data collected at the points shown on the attached location plan. This report does not reflect specific variations that may occur between test locations. The borings were located at the requested locations selected by the client where site conditions permitted and where it is believed representative conditions occur, but the full nature and extent of variations between borings and of subsurface conditions not encountered by any boring may not become evident until the course of construction. If variations become evident at any time before or during the course of construction, it will be necessary to make a re- evaluation of the conclusions and recommendations of this report and further exploration, observation, and/or testing may be required. This report has been prepared in accordance with generally accepted soil and foundation engineering practices and makes no other warranties, either expressed or implied, as to the professional advice under the terms of our agreement and included in this report. The recommendations contained herein are made with the understanding that the contract documents between the owner and foundation or earthwork contractor or between the owner and the general contractor and the foundation, excavating and earthwork subcontractors, if any, shall require that the contractor certify that all work in connection with foundations, compacted fills and other elements of the foundation or other support components are in place at the locations, with proper dimensions and plumb, as shown on the plans and specifications for the project. Further, it is understood the contract documents will specify that the contractor will, upon becoming aware of apparent or latent subsurface conditions differing from those disclosed by the original soil exploration work, promptly notify the owner, both verbally to permit immediate verification of the change, and in writing, as to the nature and extent of the differing conditions and that no claim by the contractor for any conditions differing from those anticipated in the plans and specifications and disclosed by the soil studies will be allowed under the contract unless the contractor has so notified the owner both verbally and in writing, as required above, of such changed conditions. The owner will, in turn, promptly notify this firm of the existence of such unanticipated conditions and will authorize such further exploration as may be required to properly evaluate these conditions. Further, it is understood that any specific recommendations made in this report as to on -site construction review by this firm will be authorized and funds and facilities for such review will be provided at the times recommended if we are to be held responsible for the design recommendations. � Geotechnical Engineering deport —� Geotechnical Services Are Performed for Spe Oc Purposes, Persons, and Projects Geotac Mical engineers structure their services to meet the specific needs of their clients. A geotechnical engineering study conducted for a civil engineer may not fulfill the needs of a construction contractor or even another civil engineer. Because each geotechnical engineering study is unique, each geo- technical engineering report is unique, prepared solelyfor the client. No one except you should rely on your geotechnical engineering report without first c_ �n n, ; l h the geotechnical engineer who prepared it. Andno, one -not e!:'en yes - should apply the report for arty purpose or project except the one originally contemplated. Read the Full Report Serious problems have occurred because those relying on a geotechnical engineering report did not read it all. Do not rely on an executive summary. Do not read selected elements only. A Geotechnical 6iglneering Report Is Based on A Unique Set of Project-c Factors Geotechnical engineers consider a number of unique, project -specific factors when establishing the scope of a study. Typical factors include: the client's goals, objectives. and risk management preferences; the general nature of the structure involved, its size, and configuration; the location of the structure on the site; and other planned or existing site improvements, such as access roads: parking lots, and underground utilities. Unless the geotechnical engi- neer who conducted the study specifically indicates otherwise, do not rely on a geotechnical engineering report that was: c not prepared for you, o not prepared for your project, © not prepared for the specific site explored, or o completed before important project changes were made. Typical changes that an erode the reliability of an existing geotechnical engineering report include those that affect: the function of the proposed structure, as when it's changed from a parking garage to an office building: or from alight industrial plant to a refrigerated warehouse, • elevation, configuration, location, orientation, or weight of the proposed structure, • composition of the design team, or • project ovr *-rship. As a genera! rule, always inform your geotechnical engineer of project changes - even minor ones - and request an assessment of their impact. Deoter;i=a+ica: engineers cannot accept responsibility or liabifity for problems that occur because their reports do not consider developments of which they were Subsurface Conditions Can Change A geotachnial engineering report is based on conditions that existed at the time l�..e study was performed. Do not rely on a geotechnical engineering re;;arr Triose adequacy may have been affected by: the passage of time; by man-made even, sue., as construction on or adjacent to the site; or by natu- ral events, such as floods, earthquakes, or groundwater fluctuations. Always contact the geotechnical engineer before applying the report to determine if it is still reliable. A minor amount of additional testing or analysis could prevent major problems. Most Geotechnical Findings Are Professional Opinions Site exploration identifies subsurface conditions only at those points where subsurface taste are conducted or samples are taken. Geotechnical engineers review field and laboratory data and then apply their professional judgment to render an opinion about subsurface conditions throughout the site. Actual subsurface conditions may differ -sometimes significantly from those indi- cated in your report. Retaining the geotechnical engineer who developed your report to provide construction observation is the most effective method of managing the risks associated with unanticipated conditions. A Report's Recommendations Are Not Hmd Do not 04'errely on tie construction recommendations included in your re- port. Those recommendations are not final, because geotechnical engineers develop them principally from judgment and opinion. Geotechnical engineers can finalize their recommendations only by observing actual subsurface conditions revealed during construction. The geotechnical engi- neer who developed your report cannot assume responsibility or liability for the report's recommendations if that engineer does not perform construction observation. A Geotechnical WillneeMng RqW Is Subject to Misinterpretation Other design team members' misinterpretation of geotechnical engineer- ing reports has resulted in costly problems. Lower that risk by having your geotechnical engineer confer with appropriate members of the design team after submitting the report. Also retain your geotechnical engineer to review pertinent elements of the design team's plans and specifications. Contractors can also misinterpret a geolec:nnica'' egner,7rgprcehat b�t� y having your geotechnical engi °er.par ldpat in prebid and preconstruction conferences, and by providing construct#oin o �s-r �adoo i. Do Not Redraw the Engineer% Logs Geotechnical engineers prepare final boring and testing logs based upon their interpretation of field logs and laboratory data. To prevent errors or omissions, the logs included in a geotechnical engineering report should never be redrawn for inclusion in architectural or other design drahings. Only photographic or electronic reproduction is acceptable, but recognize that separating logs from the report can elevate risk. Give Contractors a Complete Report and Guidance Some owners and design professionals mistakenly believe they can make contractors liable for unanticipated subsurface conditions by limiting what they provide for bid preparation. To help prevent costly problems, give con- tractors the complete geotechnical engineering report, but preface it with a clearly written letter of transmittal. In that letter. advise conatractors "'Of tnie report was not prepared for purposes of bid development and that the report's accuracy is limited; encourage tnerr ;o o i!ur vv;tl ine aGowi,innicat Ll lgl who prepared the report (a modest fee nr.a;, be required; andfor to conduct ad- ditional study to obtain the specific types of information they need or prefer. A prebid conference can also be valuable. Be sure contractors have sufficient time to perform additional study. Only then might you be in a position to give contractors the best information available to you, while requiring them to at least share some of the financial responsibilities stemming from unantici- pated conditions. Read Responsibility Provisions Closely Some clients, design professionals, and contractors do not recognize that geotechnical engineering is far less exact Thait other engineering disciplines. This lack of understanding has created unrealistic expectations that have led to disappointments, claims, and disputes. To help reduce the risk of such outcomes, geotechnical engineers commonly include a variety of explanatory provisions in their reports. Sometimes labeled "limitations" many of these provisions indicate where geotechnical engineers' responsibilities begin and end, to help others recognize their own responsibilities and risks. Read these provisions closely. Ask questions. Your geotechnical engineer should respond fully and frankly. Geoenvironmental Concerns Are Not Covered Tta equipment, techniques, and personnel used to perform a geoenviron- Poental study differ sign!ficantly frann those used to perform a geotechnical study. For that reason; a geotechnical esig;I,eari n or r a=s ro usualv re- late any geoenvironmental findings, conclusions, r re.camn ma da;ions; e.g., about the likelihood of encountering underground storage tanks or regulated contaminants. Unanticipated environmental problems have led to numerous project failures. If you have not yet obtained your own geoenvironmental in- formation, ask your geotechnical consultant for risk management guidance, Do not rely on an environmental rep Yrroary fo svimai-?a i'tsa Obtain Professional Assistance To Deal with Mold Diverse strategies can be applied during building design, construction, op- eration, and maintenance to prevent significant amounts of mold from grow- ing on indoor surfaces. To be effective, all such strategies should be devised for the express purpose of mold prevention, integrated into a comprehensive plan, and executed with diligent oversight by a professional mold prevention consultant. Because just a small amount of water or moisture can lead to the development of severe mold infestations, a number of mold prevention strategies focus on keeping building sun es d y, ''Ptile groun„tiatCer, Ha- ter infiltration, and similar issues may ha°yea teen adbessed as part of the geotechnical engineering study whose findings are conveyed in -this report, the geotechnical engineer in charge of this project is not a mold prevention consultant; Wane of the services performed In conucthm wide the geotechnical engineers study were designed or conducted top the puMese of mold prevention Proper Implementation of the recommendations conveyed In this report wdl not of itself he sufficient to prevent mold from growing In or on the struc- ture Involved. Rely on Your ASFE-Member Geotechnical Engineer For Additional Assistance Membership in ASFE/The Best People on Earth exposes geotachnica! engi- neers to a wide array of risk management techniques that can be of genuine benefit for everyone involved with a construction project. Confer with your ASFE-member geotechnical engineer for more information. A� iha ®eat People an Earth 8811 Colesville Road/Suite G106, Silver Spring, MD 20910 Telephone:' 301/565-2733 Facsimile: 301/589-2017 e-mail: info@asfe.org www.asfe.org Copyright 2004 by ASFE, Inc. Duplication, reproduction, or copying of this document, in whole or in part, by any means whatsoever, is strictly prohibiled, except with ASFE� specific written permission. Excerpting, quoting, or otherwise extracting wording from this document is permitted only with the express written permission VASE and only for purposes of scholarly research or book review. Only members ofASFEmay use this document as a complement to or as an element of a geotechnical engineering report. Any other firm, individual, or other entity that so uses this document without being aeASFEmember could be committing negligent or intentional (fraudulent) misrepresentation. IIGER06045 OM EWr*ECS CA ROLL NAS, LLP "Setting the standard for service„ Geotechnical • Construction Materials • Environmental - Facilities December 20, 2016 Mr. David Everett Jacobs GBNA 1100 North Glebe Road, Suite 500 Arlington, Virginia 22201 Reference: Report of Seasonal High Water Table Estimation and Infiltration Testing N.C. Army National Guard Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No. 49.3639 Dear Mr. Everett: ECS Carolinas, LLP (ECS) recently conducted a seasonal high water table (SHWT) estimation and infiltration testing within the stormwater best management practice (BMP) area(s) off of Infantry Road in Wilmington, New Hanover County, North Carolina. This letter, with attachments, is the report of our testing. Field Testing On December 19, 2016, ECS conducted an exploration of the subsurface soil and groundwater conditions at two requested locations shown on the attached Boring Location Plan (Figure 1). The boring locations were surveyed prior to ECS's site visit. The elevation data was provided by Robert H. Goslee & Associates, PA. The purpose of this exploration was to obtain subsurface information of the in situ soils for the stormwater BMP area(s). ECS explored the subsurface soil and groundwater conditions by advancing one hand auger boring into the existing ground surface at each of the requested boring locations. ECS visually classified the subsurface soils and obtained representative samples of each soil type encountered. ECS also recorded the SHWT and groundwater elevation observed at the time of the hand auger borings. The attached Infiltration Testing Form provides a summary of the subsurface conditions encountered at the hand auger boring locations. The SHWT and groundwater elevation was estimated at the boring locations below the existing grade elevation. A summary of the findings are as follows: Location SHWT Groundwater Elevation B-1 18 inches 40 inches 13.152 B-2 44 inches 70 inches 18.642 ECS has conducted two infiltration tests utilizing a compact constant head permeameter near the hand auger borings in order to estimate the infiltration rate for the subsurface soils. Infiltration tests are typically conducted at two feet above the SHWT or in the most restrictive soil horizon. Tests in clayey conditions are conducted and calculated up to 30 minute intervals. If an exact hydraulic conductivity is necessary for these locations, then ECS recommends collecting samples by advancing Shelby tubes and performing laboratory permeability testing. ECS Capes Services. PL-C • EGS Carolinas, LLP • EGS Central, PLLC • ECS Florida. LLC • ECS Mid -Atlantic, LLC • ECS Midwest. LLC • ECS Southeast, LLC • ECS Te.<as. LLP vvww, eoslimited. com Report of SHWT Estimation and Infiltration Testing N.C. Army National Guard Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No. 49.3639 December 20, 2016 Field "lest Results Below is a summary of the infiltration test results: Location Description Depth Inches/ hour B-1 Gray fine SAND w/ clay18 inches 0.35 B-2 Tan/orange/gray sandy CLAY 42 inches <0.001 Infiltration rates and SHWT may vary within the proposed site due to changes in elevation and subsurface conditions. Closure ECS's analysis of the site has been based on our understanding of the site, the project information provided to us, and the data obtained during our exploration. If the project information provided to us is changed, please contact us so that our recommendations can be reviewed and appropriate revisions provided, if necessary. The discovery of any site or subsurface conditions during construction which deviate from the data outlined in this exploration should be reported to us for our review, analysis and revision of our recommendations, if necessary. The assessment of site environmental conditions for the presence of pollutants in the soil and groundwater of the site is beyond the scope of this geotechnical exploration. ECS appreciates the opportunity to provide our services to you on this project. If you have any questions concerning this report or this project, please contact us at (910) 686-9114. Respectfully, ECS CAROLINAS, LLP K. Brooks Wall Project Manager bwall(&-ecslimited.com 910-686-9114 Attachments: Figure 1 - Boring Location Plan Infiltration Testing Form ASFE Document W. Brandon Fulton, PSC, PWS, LSS Environmental Department Manager bfulton0-ecslimited.com 704-525-5152 0 APPROXIMATE BORING LOCATIONS SCALE SHOWN ABOVE NC Army National Guard Readiness Ctr. Wilmington, New Hanover County, arth Carolina ECS Project # 49.3639 December 19, 2016 KBW N W * E s Figure 1— Boring Location Plan Provided by: Google Earth Infiltration Testing Form N.C. Army National Guard Readiness Center Wilmington, New Hanover County, North Carolina ECS Project No. 49.3639 December 19, 2016 Location Depth USCS B-1 0-18" SC 18"-48" SC Soil Description Tan/gray fine SAND w/ clay Gray fine SAND w/ clay Seasonal High Water Table was estimated to be at 18 inches below the existing grade elevation. Groundwater was encountered at 40 inches below the existing grade elevation. Test was conducted at 18 inches below existing grade elevation Infiltration Rate: 0.35 inches per hour Location Depth USCS B-2 0-4" S M 4"-24" SC 24"-42" SC 42"-70" CL SoilDescri tp ion Gray silty SAND Tan fine SAND w/ clay Grange clayey SAND Tan/orange/gray sandy CLAY Seasonal High Water Table was estimated to be at 44 inches below the existing grade elevation. Groundwater was encountered at 70 inches below the existing grade elevation. Test was conducted at 42 inches below existing grade elevation Infiltration Rate: <0.001 inches per hour �— Geolechn'i'cal E nu,-ineeping Report � Geotechnical Services Are Performed for Specific Purposes, Persons, and Projects Geotechnical engineers structure their services to meet the specific needs of their di -ants. A geotechnical engineering study conducted for a civil engineer may not fu!r!ll the needs of a cons:ru� iion contractor or even another civil engineer. Because each geotechnical engineering study is unique, each geo- technical engineering report is u Piqua, prepared sclel}for the client. No one except you should rely on your geotechnical engineering report without first conferring with the geotechnical engineer who prepared it. And no one - not even you -should apply the report for any purpose or project except the one originally contemplated. Read the Full Report Serious problems have GCCUrred Itecause those relying on a geotechnical engineering report did not read ilall. Do not rely on., an executive summary. Do not read selected elements only. A Goollecholcal 6igineerho Re opt Is Based on A Vulme Set of Ppaject4peclflc Factors Geotechnical engineers consider a number of unique, project -specific factors when establishing the scope of a study. Typical factors include: the client's goals, objectives, and risk management preferences; the general nature of the structure involved, its sire: and configuration; the location of the structure on the site; and other planned or existing site improvements, such as access roads, parking lots, and underground utilities. Unless the geotechnical engi- neer who conducted the study specifically indicates otherwise, do not rely on a geotechnical engineering report that was: • not prepared for you, o not prepared for your project, c not prepared for the specific site explored, or completed before important project changes were made. • elevation, configuration: location, orientation, or weight of the proposed structure, • composition of the design team, or • project ownership. As a genera! Pule, always inform your geotechnical engineer of project changes - even minor ones - aid request an assessment of their impact. Georechnicai engineers cannot accept responsibi!iry or Aabiiity for problems that occur because their reparh do not consider developments of which they were not informed. Subsurface Conditions Can Change A geotechnical engineering report is based on conditions that existed at the time the study was performed. Do not reiy on a geotechnical engineering report whose adequacy may have been affected by: the passage of time; by man-made events.. such as construction on or adjacent to the site; or by natu- ral events, such as floods, earthquakes, or groundwater fluctuations. Always contact the geotechnical engineer before applying the report to determine if it is still reliable. A minor amount of additional testing or analysis could prevent major problems. Most Geotechnical Findings Ape Professional Opinions Site exploration identifies subsurface conditions only at those points where subsurface tests are conducted or samples are taken. Geotechnical engineers review field and laboratory data and then apply their professional judgment to render an opinion about subsurface conditions throughout the site. Actual subsurface conditions may differ -sometimes significantly from those indi- cated in your report. Retaining no geotechnical engineer who developed your report to provide construction observation is the most effective method of managing the risks associated with unanticipated ccvnditiors. Typical changes that can erode the reliability of an existing geotechnical A Report's Rceommendatlons Are Not Final engineering report include those that affect: Do not overrely on the construction recommendations included in your re - the function of the proposed structure, as when it's changed from a port. Those recommendations ant not final, because geotechnical engineers parl(h.g garage to an office building, or from alight industrial plant develop them principally from judgment and opinion. Geotechnical engineers to a refrigerated warehouse; can finalize their recommendations only by observing actual subsurface conditions revealed during construction. The geotechnical engi- neer who developed your report cannot assume responsibility or liability for the report's recommendations if that engineer does not perform construction observation. A Geotechnlcal Engineering Report Is Subject to Misinterpretation Other design team members' misinterpretation of geotechnical engineer- ing reports has resulted in costly problems. Lolvver that risk by having your geotechnical engineer confer with appropriate members of the design ;earn after submitting the report. Also retain your geotechnical engineer to review pertinent elements of the design team's plans and specifications. Contractors can also misinterpret a geotechnical engineering report. Reduce that risk by having your geotechnical engineer participate in prebid and preconstruction conferences, and by providing construction observation. Do Not Redraw the Engineer's Logs Geotechnical engineers prepare final boring and testing logs based upon their in'erprefation of field logs and laboratory data. To prevent errors or omissions, the logs included in a geotechnical engineering report should ,levy, be rudralyn'or Inclusion in architectural or other design dra41ings. OnN, phof:lg"ap.Nc or electronic reproduction is acceptable, N t rpcjg :i`r h-" -` aau:'.':tj' io s rr olm t 4 r�i; cut! Cali elem. risk. Give Contractors a Complete Report and Guidance Some owners and design professionals mistakenly believe they can make contractors liable for unanticipated subsurface conditions by limiting what they provide for bid preparation. To help prevent costly problems, give con- tractors the complete geotechnical engineering report, but preface it with a clearly written letter of transmittal. In that letter, advise contractors t=oat !*r report was not prepared for purposes of bid development and that the report's accuracy is limited; encourage them to confer with the geotechnical engineer woo prepared the report (a modest fee may be required) and/or to conduct ad- dirtontai stud, to ohtaln the specific types of information they need or prefer. A prebid conference can also be valuable. 8e sure contractors have sufficient timato perform additional study. Only then might you be in a position to give contractors the best information available to you, while requiring thern to at least share some of the financial responsibilities stemming from unantici- pated conditions. Read Responsibility Provisions Closely Some clients, design professionals, and contractors do not recognize t'"na geotechnical engineering is lar less exact than other engineering disciplines. This lack of understanding has created unrealistic expectations that have led it... disappointments, claims, and disputes. To help reduce the risk of such outcomes, geotechnical engineers commonly include a variety of explanatory provisions in their reports. Sometimes labeled "limitations" many of these provisions indicate where geotechnical engineers' responsibilities begin and end, to help others recognize their own responsibilities and risks. Read these provisions closely. Ask questions. Your geotechnical engineer should respond fully and frankly. Geoenvironmental Concerns Are Not Covered The equipment, techniques, and personnel used to perform a geoenviron- mental study differ significantly from those used to perform a geotechnical study. For that reason, a geotechnical engineering report does not usually re- late any geoenvironmental findings, conclusions, or recommendations; e.g., about the likelihood of encountering underground storage tanks or regulated contaminants. Unanticipated environmental problems have led to numerous project railures. if you have not yet obtained your own geeoenvironmertal i'R formation, ask your geotechnical consultant for risk management guidance. Do notrely ow, a• ?nvironmentai repndprepared for someone else. Obtain Professional Assistance To Deal with Mold Diverse strategies can be applied during building design:, cJjnstrueJon, op- eration; and maintalnance to prevent significant ar;noun s d mold from grow- ing on indoor surfaces. To be effective, all such strategies should be devised for the express purpose of mold prevention, integrated into a comprehensive plan, and executed with diligent oversight by a professional mold prevention consultant. Because just a small amount of water or ,moisture can lead to the development of severe mold infestations, a number of mold prevention strategies focus on keeping building surfaces dry. Wlhile groundwater: wa- ter infiltration, and similar issues may have been addressed as part of the geotechnical engineering study whose findings are conveyed in -this report, the geotechnical engineer in charge of this project is not a mold prevention consultant; none of the services performed in connect►on with fba geotechnical engineer's study were designed or conducted for the purpose of mold prevention. Proper hnpiementation of the recommendations conveyed /n this report MY not of itseff he sufficient to prevent mold Irem growing in or on the struc- ture involved. Rely on Your ASFE-Mender Geotechnical Engmeer For Additional Assistance Membership in ASFE,IThe Best People on Earth exposes geotechnical engi- neers to a wide array of risk management techniques that can be of genuine benefit for everyone involved with a construction project. Confer with your ASFE-member geotechnical engineer for more information. 44SP7E Tba Beat PaaQla au ESPt4 8811 Colesville Road/Suite G106, Silver Spring, MD 20910 Telephone:' 301/565-2733 Facsimile: 301/589-2017 e-mail: info@asfe.org www.asfe.org Copydght2004byASrE. ir7c. Dup'icatior;, rPoroduction, orcopyirgofthisdocumar; it vhoiecr.-*nNr' 6vanymears w.hats0ever, isv.i`-,ASFRspecific wrrben permission. Erc2rot;:g Wting Of E ` °*v:.'se 0AWtIng Wording from tills :�YU;nant is, w:Titf2d rill;• ta;ti, 4'1c aY :E.95 write. ormissiop F:=& es mr;h a., took ravfew, ON' err�a rs j4 4SFE may uSO INS CC�YWR P c 0; r.; � P r • a ... r- i'� .�' 2, a C.71„ Pv'?d%t t, ;:�/ dS an z'etrant of a 1je0ie::lJr11fai ey?gOiCe ? cx t L, 2 ':i'7. Riiv; duo' or Xod., dntify t'mr se user hs document without bfflng a, ASr"c member coufr he a mmit1tng regligenl or intantional (frauduJent) m's 11GER06045.0M 9 z 'a+ g� oN ga N O 6 N o cn rn �^ Gx 4 oe N� ri y o- r; OP AQ /; o a2>. _ ���� 3g�8.10•. 60N 1 � I vi om rQz :,A�D� 0mc c�� Z�cn> G7 h] CC, C I $ Z m o•,� I S9F vV) >JO P GGGGG V A ► U N GG�r�_r� Gil u +d V 0 N♦ rrrr G N 0 m 5 J r E G r .. _ 0. =m R NHeN h NmrDr�N�uO �Nmx%ex�N}JVriaNx V + N O A 4 p W u S A ti y� Appendix B. Drainage Area Maps Pre -Developed Drainage Area Map (Refer to Appendix G for previously approved map) • Post -Developed Drainage Area Map • Impervious History Maps JACOBS 501 NortM1 BmeMrey, SeMI LouN, Mleaowl 83103 m E so w i !A '4 ���F1t i `• � !fir/ � Ile" ?: oposizo YPASSINGISAN 42 t.� fir*:», AM i 3ii:3TiiACsAfi�ri 1arisg s ♦ y. Y . ,.. PROPOSED IMPERVIOUS x' ; EXISTING I�VIPERVIOUS BYPASSING SAND FILTER; x 11011 — REMOVED 0.42AC < 1.04 AC D s a LAND USE BREAKDOWN POND SAND FILTER 1 SAND FILTER 2 LAWN, GOOD CONDITION (CN = 39) 3.12 AC. 0.09 AC. 0.53 AC. PAVEMENT (CN = 98) 3.30 AC. 1.45 AC. 1.42 AC. COMPOSITE CN 69 95 82 !r j F Q fa h � 47 P OP SE R IN SS C TE .0 DRAINAGE ! `' AREA TO SAND -`FILTER 1j. ,�'• . c 1.54 AC. DESCRPTIDN DATE 0 0 O O o z u 0 J�V co 3 o d z I—zo W 0 J O a S Key Plan: __. 4'CEIVE POST TO POND 3da 6.42 AC SAND FILTER 1 CN = 69 BY T.O.C. = 5.0 MIN �t Jacobs Project No.: F6W72100 1 t Drawln8 Me: h � CIVIL POST -DEVELOPED DRAINAGE AREAS Date: 03 APRIL 2017 Designed: JEG Drawing No.: Pre—: JEG Checked: TJW 7M 1. c:vrr i 11 _- \� jr"." j i!/ r� I I/ 1 l i�� 1 1 -I/; l `:' I �• 1 I ' I I 'y Ii 1 I I li i ri- I 1 I \ ,L................. Fr `« \ h L \� ' , , \ \ \ \ _ � I III �• ,i r I ll- _`®I,i �. �: ��``�� ..� r � �� l _ _�j `,� i�' :,,�\ � � � ) I l / /l i/ ill � r ';'�-'�' ,. � ��� �, ' �. w ' i„� �F• / / ��� \ \ / / / / / 1� t,. 31 oc r l 6f' lei �Jiyllu I j�E;ti AC 89 JACOBS fioi NwIM1 Bmatlway, SaNf Loin ANasowl fi3102 REGISTRAnON NUMBER. W Uz O cl) ~qzt M O C) o W� o z �Q J O Z Lo o °� J�U � J � 00 Q) z ��gO J ICr O°°Z OIL Qc,� Q p zoo Z Z °a� Key Plan: Scales: Jacobs Project No.: F8W72100 Drawing Title: CIVIL POST -DEVELOPED DRAINAGE AREAS - OVERALL Date: 03 APRIL 2017 T Designed: JEG Drawing No Drown: JEG Checked: TJW PRE 1988 IMPERVIOUS COVER TOTAL PROPERTY AREAS 41.29 AC (1,798,592 SF). TOTAL IMPERVIOUS AREA: 4.15 ASC (181,038 SF) TOTAL PERVIOUS AREA: 37.13 AC (1,617,383 SF) a r r r r .a ® r IMPERVIOUS AREA BASED ON SITE SURVEY AND CROSS REFERENCED AGAINST THE 1981 IMAGE INCLUDED ON THIS SHEET. n u fi01 NwM amaOwtY. SeMf L•We, AMaawM 831.P W� U� O_ co o Q o O O Q J ® MTV P300 I— c Q V -tI,Lo Zo2 " c� O �>:z ZZ c, Key Ptam u�eles Jacobs Project N., F6W72100 Drawing Trga: CIVIL PRE 1988 IMPERVIOUS COVER Dah:: 03 APRL 2017 Design.&. JEG I D= wing N- Drawn: JEG Chack.d: TJW JACOBS SOf Narar amaNvay, Setif LOW; Aaeaourl a3fe2 2014 IMPERVIOUS COVER TOTAL PROPERTY AREA: 41.29 AC (1,798,592 SF) IMPERVIOUS PRIOR TO PROJECT: 4.15 AC (181,038 SF) EXISTING IMPERVIOUS REMOVED: 0 AC (0 SF) ADDED IMPERVIOUS: 1.04 AC (45,302 SF) LEGEND PRE 1988 IMPERVIOUS ® 2014 ADDITIONAL IMPERVIOUS J ' I I ' > < a / �`�y , ♦ r W� ~ J Uto _O �~ ZZ o � � o 0 O J RQ Q - 0 � p /zco U O 0 Q zoZ �-zo O IZ— " � cD Z Z c°�a3 Key Wan: Scales: Jambs Pmject No.: F6W72100 Drawing Tide: CIVIL 2014 IMPERVIOUS COVER Date: 03 A2017 Designed: JEG EG Drawing No.: Drawn: JEG Checked: TJW 3 JACOBS xtrmabsA.nrnr sauxraas, wrwlalroz NEW PROPOSED IMPERVIOUS COVER TOTAL PROPERTY AREA: 41.29 AC (1,798,592 SF) IMPERVIOUS PRIOR TO PROJECT: 5.19 AC (226,147 SF) EXISTING IMPERVIOUS REMOVED: 1.04 AC (45,302 SF) ADDED IMPERVIOUS: 3.03 AC (131,987 SF) -TREATED (SAND FILTER & DRY POND): 1.86 AC (81,229 SF) LEGEND PRE 1988 IMPERVIOUS 2014 ADDITIONAL IMPERVIOUS f'7? NEW PROPOSED IMPERVIOUS -UNTREATED OR DRY POND ONLY:1.86 AC (50,758 SF) EXISTING IMPERVIOUS TO REMAIN: 4.15 AC (180,774 SF) -TREATED (SAND FILTER & DRY POND):1.44 AC (62,519 SF) -UNTREATED: 2.71 AC (118,255 SF) / NET IMPERVIOUS ADDITION:1.99 AC (86,685 SF) TREATED > NET ADDITION TOTAL TREATED IMPERVIOUS: 3.30 AC (143,748 SF) I ° I � 1I I I: ;, • ,%/�� Jam. -r,.. f�fr i z a E E 9 A m�� 11■�� w .9 LLI � Q J U� O co ZZ o O� 04 o Q Q O J Loo� O Z Q C Inn 00 Q ��O J Q �DoZ Q U Zdz Z I-ZO OIL Q�b Z °a _Z Key Plen: v s�alea: Jacobs Project No.: FeW72100 Drawing TN.: CIVIL NEW PROPOSED IMPERVIOUS COVER N Date: 00 APRIL 2017 Designed: JEG Dre JEG Drawing No.: Checked: TJW Stormwakm Appendix C. Sand Filter Design 0 Sand Filter #I: MDC Calculations& Verifications 0 Sand Filter #2: MDC Calculations & Verifications Job No. 21 00 E JDate: 2�17 Wilmington Jacobs Engineering Group _Revisions _ 111 Coming Road, Suite 200 No - - Date - Descdptiorl - - Cary, NC 27516 r'-- l) 2/6/2017 _ MDC 1 - FILTER MOD 1 - SHWT SEPARATION The minimum separation between the lowest point of the sand filter system and the SHWT shall be: a) two feet for open -bottom designs; and b) one foot for closed bottom designs. Exceptions to the one -foot SHWT separation may be made if the application provides documentation that the design will neither float nor drain the water table. Sand filter is shown to be equipped with antifloatation protection to prevent floatation in the even of elevated groundwater conditions. It is a closed system that cannot drain the water table. 2 - TWO CHAMBER SYSTEM The sand filter shall Include a sediment chamber and a sand chamber. Storage volume in each chamber shall be equivalent. The sand filter is designed with equal volumes in the sediment and sand chambers. 9 - SEDIMENT(SAND CHAMBER SIZING. The volume of water that can be stored in the sediment chamber and the sand chamber above the sand surface combined shall be 0.75 times the treatment volume. The elevation of bypass devices shall be set above the pending depth associated with this volume. The bypass device may be designed to attenuate peak flows. The area required for a sand filter device is calculated similarly to many other SCMs: 1) Calculate the design volume: Drainage Area = 1.54 acres SOIL TYPE: CN Baymeadefinesand Impervious Area = 1.45 acres Q 98 Hydrologic Soil Group A Pervious Area =1 0.09 1 acres @ 39 Composite: 1.54 acres @ 95 Find the volume of the 1.5" storm using the "Discrete NRCS Curve Number Method": S = 1000/CN - 1 D Where: S = Maximum retention after rainfall begins (in) CN = Curve Number (unitless) Q* _ (P-0.2S) ^ 2 / (P + 0.8S) Where: Q* = Runoff Depth (in) P Rainfall Depth (in) = 1.5 inches S = 0.58 inches Q. = 0.98 inches Runoff Volume = Q* x Area (sf) / 12 = 5466 cubic feet 2) Multiply the design volume by 0.75. 0.75WQv = 0.75 x 5466.5 = 4100 cubic feet 3) Divide the dismounted design volume by the ponding depth, this will be the minimum surface area of the sand filter. Min. surface area = 4100 / 6.0 = 683 square feet Surface area provided by design = L x W = 20 x 40 - 800 square feet C 4 - MAXIMUM PONDING DEPTH. The maximum ponding depth from the top of the sand to the bypass device shall be six feet. The sand filter is designed with a ponding depth of 6 feet from the top of the sand to the bypass device. C 6 - FLOW DISTRIBUTION Incoming stormwater shall be evenly distributed over the surface of the sand chamber. The design includes a series of orifices which will distribute stormwater evenly over the surface of the sand chamber. 6 - SAND MEDIA SPECIFICATION Sand media shall meet ASTM C33 or the equivalerrL Sand media shall meet the standards outlined in ASTM C33. 7 - MEDIA DEPTH The filter bed shall have a minimum depth of 18 Inches. The minimum depth of sand above the underdrain pipe shall be 12 inches. The filter bed is designed with a sand media depth of 18 inches. The depth of sand above the 4" underdrain pipe is +/-14 inches. MDC 1-7 G:\ClxAL\ftomwddw\Army National Guard -Wilmington (F8W72100)\SWM\Sand Filter 1 Cabulations.)ds Job No. FIBWr 2100 Jacobs Engineering Group 111 Coming Road, Suite 200 Cary, NC 27518 Job Name NCARNG - Wilmington Date: 2/6/2017 Revisions No Date Descri.tion 0 7/3/2017 SANT� RXER 1 MDC 8- The followinq design is based on requirements set forth in Part C-12 of NCDEQ's 03 January 2017 version of "Stormwater Design Manual". MDC 8 - MAINTENANCE OF MEDIA The sand filter shall be maintained in a manner that results in a drawdown of at least two Inches per hour at the sand surface. Remedial actions shall be taken if the 6 foot temporary pool above the 18 inch sand layer takes longer than 36 hours to drain. MDC 9 - CLEAN -OUT PIPES At least one clean -out pipe shall be provided at the low point of each underdrain line. Clean out pipes shall be capped. The design includes a 4" PVC perforated clean -out pipe. MDC 8-9 G:\CIVIL\from w drive\Anny National Guard - Wilmington (F6W72100)\SWM\Sand Filter 1 CalculationsAs Job No. 21 00 AL Jo 0 � Dab Name 2�17 Wilmington Jacobs Engineering Group Revisions 111 Corning Road, Suite 200 No Date - ° Descri ttiion ' Cary, NC 27518 i - -D - 7/3/2017 -� ' MDC 1- FILTER MDC 1 - SHWT SEPARATION The minimum separation between the lowest point of the sand filter system and the SHWT shall be: a) two feet for open -bottom designs; and _ b) one foot for dosed bottom designs. Exceptions to the one -foot SHWT separation may be made if the application provides documentation that the design will neither float nor drain the water table. Sand filter is shown to be equipped with antlfloatation protection to prevent floatation in the even of elevated groundwater conditions. It is a closed system that cannot drain the water table. 2 - TWO CHAMBER SYSTEM The sand filter shall include a sediment chamber and a sand chamber. Storage volume in each chamber shall be equivalent. The sand filter is designed with equal volumes in the sediment and sand chambers. 3 -SEDIMENT/SAND CHAMBER SIZING. The volume of water that can be stored in the sediment chamber and the sand chamber above the sand surface combined shall be 0.75 times the treatment volume. The elevation of bypass devices shall be set above the ponding depth associated with this volume. The bypass device may be designed to attenuate peak flows. The area required for a sand fitter device is calculated similarly to many other SCMs: 1) Calculate the design volume: Drainage Area =F 1.95 acres CN Impervious Area = 1.42 acres @ 98 _ Pervious Area = 0.53 acres @ 39 Composite: 1.95 acres @ 82 Find volume of the 1.5" storm using the "Discrete NRCS Curve Number Method": S = 1000/CN - 10 Where: S = Maximum retention after rainfall begins (in) CN = Curve Number (unitless) Q* _ (P-0.2S) -2 / (P + O.BS) Where: Q* = Runoff Depth (in) P = Rainfall Depth (in) _ 2.20 inches = 0.34 inches Runoff Volume = Q* x Area (so / 12 = 2) Multiply the design volume by 0.75. 0.75WQv = 0.75 x 1.5 inches 2439 cubic feet 2439.0 = 1829 cubic feet 3) Divide the discounted design volume by the ponding depth, this will be the minimum surface area of the sand filter. Min. surface area = 1829 I 1.0 = 1 B29 square feet Surface area provided by design = L x W = 335 x 6 = 2010 square feet IC 4 - MAXIMUM PONDING DEPTH. The maximum ponding depth from the top of the sand to the bypass device shall be six feet. The sand filter is designed with a ponding depth less than 6 feet from the top of the sand to the bvoass devim IC 5 - FLOW DISTRIBUTION Incoming stormwater shall be evenly distributed over the surface of the sand chamber. The design includes a series of orifices which will distribute stormwater evenly over the surface of the sand chamber. 5 - SAND MEDIA SPECIFICATION Sand media shall meet ASTM C33 or the equivalerrL Sand media shall meet the standards outlined in ASTM C33. 7 - MEDIA DEPTH The filter bed shall have a minimum depth of 18 Inches. The minimum depth of sand above the underdrain pipe shall be 12 inches. The filter bed is designed with a sand media depth of 18 inches. The depth of sand above the 4" underdrain pipe is +/-14 inches. MDC 1-7 G:\CIVIL\from w driva\Army National Guard -Wilmington (FSW72100)\SWM\Sand Filter 2 Celculations.xls � AvaCOBS Jacobs Engineering Group 111 Corning Road, Suite 200 Cary, NC 27518 Job No. F6W72100 Job Name NCARNG - Wilmington Date: 2/6/2017 Revisions _ No _ Date Description 1 0 _ 7/3/2017 SAND F1( TER 2 MDC 8-9 The following design is based on requirements set forth in Part C-12 of NCDEQ's 03 January 2017 version of "Stormwater Design Manual". MDC 8 - MAINTENANCE OF MEDIA The sand filter shall be maintained In a manner that results In a drawdown of at least two Inches per hour at the sand surface. Remedial actions shall be taken if the 12" temporary pool above sand filter takes more than 6 hours to drain. MDC 9 - CLEAN -OUT PIPES At least one clean -out pipe shall be provided at the low point of each underdrain line. Clean out pipes shall be capped. The design includes a 4" PVC perforated clean -out pipe. MDC 8-9 G:\CIVIL\from w drive\Army National Guard - Wilmington (F6W72100)\SWM\Sand Filter 2 Calculations.xls Alliarjage ; ,9C3t W3 c E ro G io a Ga,.rAtrdsP J�Co�' Appendix D. Dry Pond Design Proposed Conditions Dry Pond: MDC Calculations & Verifications • Proposed Conditions Pond Routing Future Conditions Dry Pond: MDC Calculations & Verifications • Future Conditions Pond Routing (to identify future conditions impervious addition capacity) • Anti -Floatation Calculations Watershed Model Schematic Hydraflow Hydrographs Extension forAutoCAD® Civil 31302016 byAutodesk, Inc. v10.5 Legend L Oriain Description 1 SCS Runoff Post to Pond 2 Reservoir Dry Pond Outflow Project: NCARNCRC- stormwater model.gpw I Tuesday, 06 / 13 / 2017 Hydrograph Return Period Rep y ra ow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Hyd. No. Hydrograph type (origin) Inflow hyd(s) Peak Outflow (cfs) Hydrograph Description 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr 1 2 SCS Runoff Reservoir ------ 1 10.96 0.114 17.51 0.141 ------- ------- ------ ------ 38.01 0.199 47.36 0.218 55.97 0.960 65.12 2.126 Post to Pond Dry Pond Outflow Proj. file: NCARNCRC- stormwater model.gpw Tuesday, 06 / 13 / 2017 Hydrograph Summary Report Hydraflow Hydrographs Extension for AutoCAD® Civil 31382016 by Autodesk, Inc. v10.5 +vd. Hydrograph type (origin) Peak flow (cfs) j(min) Time interval Time to Peak (min) Hyd. volume (cuft) Inflow hyd(s) Maximum elevation (ft) Total strge used (cuft) Hydrograph Description 1 SCS Runoff 10.96 2 718 22,163 ------ I ----- ------ Post to Pond 2 Reservoir 0.114 2 1442 I 21,595 1 10.31 17,434 Dry Pond Outflow NCARNCRC- stormwater model.gpw Retum Period: 1 Year Tuesday, 06 / 13 / 2017 4 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Tuesday, 06 / 13 / 2017 Hyd. No. 1 Post to Pond Hydrograph type = SCS Runoff Peak discharge = 10.96 cfs Storm frequency = 1 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 22,163 cuft Drainage area = 6.420 ac Curve number = 69* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 3.60 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 " Composite (Area/CN) [(3.300 x 98) + (3.120 x 39)] / 6.420 Post to Pond Q (cfs) Hyd. No. 1 -- 1 Year Q (cfs) 12.00 12.00 10.00 10.00 8.00 8.00 6.00 6.00 4.00 4.00 2.00 2.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 1 Time (min) Hydrograph Report 5 Hydraflow Hydrographs Extension for AutoCAD® Civil 3138 2016 by Autodesk, Inc. v10.5 -lyd. No. 2 Dry Pond Outflow Hydrograph type = Reservoir Peak discharge Storm frequency = 1 yrs Time to peak Time interval = 2 min Hyd. volume Inflow hyd. No. = 1 - Post to Pond Max. Elevation Reservoir name = Dry Pond Max. Storage Storage Indication method used. Q (cfs) 12.00 10.00 M M 4.00 2.00 0.00 0 600 Hyd No. 2 1200 Dry Pond Outflow Hyd. No. 2 --1 Year Tuesday, 06 / 13 / 2017 = 0.114 cfs = 1442 min = 21,595 cult = 10.31 ft = 17,434 tuft Q (cfs) 12.00 10.00 11 14- 118> 4.00 2.00 0.00 1800 2400 3000 3600 4200 4800 5400 6000 - Hyd No. 1 Total storage used = 17,434 cult Time (min) Hydrograph Summary Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Hyd. No. Hydrograph type (origin) Peak flow (cfs) Time interval (min) Time to Peak (min) Hyd. volume (cuft) Inflow hyd(s) Maximum elevation (ft) Total strge used (cuft) Hydrograph Description 1 SCS Runoff 17.51 2 718 35,010 ---- Post to Pond 2 Reservoir i i 0.141 2 1442 32,093 i 1 Dry Pond Outflow NCARNCRC- stormwater model.gpw Return Period: 2 Year Tuesday, 06 / 13 / 2017 Hydrograph Report 7 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Hyd. No. 1 Post to Pond Hydrograph type = SCS Runoff Peak discharge Storm frequency = 2 yrs Time to peak Time interval = 2 min Hyd. volume Drainage area = 6.420 ac Curve number Basin Slope = 0.0 % Hydraulic length Tc method = User Time of conc. (Tc) Total precip. = 4.50 in Distribution Storm duration = 24 hrs Shape factor Composite (Area/CN) = [(3.300 x 98) + (3.120 x 39)) / 6.420 Q (cfs) 18.00 15.00 12.00 M M 3.00 Post to Pond Hyd. No. 1 -- 2 Year Tuesday, 06 / 13 / 2017 = 17.51 cfs = 718 min = 35,010 cult = 69* = Oft = 5.00 min = Type II = 484 Q (cfs) 18.00 15.00 12.00 WE M 3.00 0.00 : - --L I I I I I I .. —.-L- 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 1 Time (min) Hydrograph Report 8 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Hyd. No. 2 Dry Pond Outflow Hydrograph type = Reservoir Peak discharge Storm frequency = 2 yrs Time to peak Time interval = 2 min Hyd. volume Inflow hyd. No. = 1 - Post to Pond Max. Elevation Reservoir name = Dry Pond Max. Storage Storage Indication method used. Q (cfs) 18.00 15.00 12.00 M1 . BI 3.00 w 600 Hyd No. 2 Dry Pond Outflow Hyd. No. 2 -- 2 Year Tuesday, 06 / 13 / 2017 = 0.141 cfs = 1442 min = 32,093 cuft = 10.95 ft = 29,148 cuft Q (cfs) 18.00 1 two 12.00 MIX111111111111111 MIWIIIIIIIIIIIIIII 3.00 0.00 1200 1800 2400 3000 3600 4200 4800 5400 6000 Hyd No. 1 Total storage used = 29,148 cult Time (imn) Hydrograph Summary Report Hydraflow Hydrographs Extension for AutoCAD®Civil 3D® 2016 by Autodesk, Inc. v10.5 Hyd. Hydrograph type (origin) Peak flow (cfs) Time interval (min) Time to Peak (min) Hyd. volume (cuft) Inflow hyd(s) Maximum elevation (ft) Total strge used (cult) Hydrograph Description 1 SCS Runoff 38.01 2 716 76,773 — --- I ----- ------ Post to Pond 2 Reservoir 0.199 2 1444 51,653 1 12.77 66,222 Dry Pond Outflow NCARNCRC- stormwater modei.gpw Return Period: 10 Year Tuesday, 06 / 13 / 2017 10 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Hyd. No. 1 Post to Pond Hydrograph type = SCS Runoff Peak discharge Storm frequency = 10 yrs Time to peak Time interval = 2 min Hyd. volume Drainage area = 6.420 ac Curve number Basin Slope = 0.0 % Hydraulic length Tc method = User Time of conc. (Tc) Total precip. = 7.00 in Distribution Storm duration = 24 hrs Shape factor " Composite (Area/CN) [(3.300 x 98) + (3.120 x 39)] / 6.420 Q (cfs) 40.00 30.00 20.00 10.00 w, Post to Pond Hyd. No. 1 -- 10 Year 120 240 360 480 600 720 840 960 Hyd No. 1 Tuesday, 06 / 13 / 2017 = 38.01 cfs = 716 min = 76,773 cuft = 69* = Oft = 5.00 min = Type II = 484 Q (cfs) 40.00 30.00 20.00 10.00 0.00 1080 1200 1320 1440 1560 Time (min) Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3130 2016 by Autodesk, Inc. 00.5 Hyd. No. 2 Dry Pond Outflow Hydrograph type = Reservoir Storm frequency = 10 yrs Time interval = 2 min Inflow hyd. No. = 1 - Post to Pond Reservoir name = Dry Pond Storage Indication method used. Q (cfs) 40.00 K� 20.00 10.00 Peak discharge Time to peak Hyd. volume Max. Elevation Max. Storage Dry Pond Outflow Hyd. No. 2 — 10 Year Tuesday, 06 / 13 / 2017 = 0.199 cfs = 1444 m i n = 51,653 cuft = 12.77 ft = 68,222 cuft 600 1200 1800 2400 3000 3600 4200 4800 5400 Hyd No. Hyd No. 1 Total storage used = 68,222 cuft Q (cfs) 40.00 30.00 20.00 10.00 0.00 6000 Time (min) 12 Hydrograph Summary Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3DO 2016 by Autodesk, Inc. v10.5 Hyd. No. Hydrograph type (origin) Peak flow (cfs) Time interval (min) Time to Peak (min) Hyd. volume (cuft) Inflow hyd(s) Maximum elevation (ft) Total strge used (cuft) Hydrograph Description 1 SCS Runoff 47.36 2 716 95,960 ------ ------ ------ Post to Pond 2 Reservoir 0.218 2 1444 58,262 1 13.53 86,416 Dry Pond Outflow NCARNCRC- stormwater model.gpw Return Period: 25 Year Tuesday, 06 / 13 / 2017 Hydrograph Report 13 Hydraflow Hydrographs Extension for AutoCAD® Civil 3DO 2016 by Autodesk, Inc. 00.5 Ayd. No. 1 Post to Pond Hydrograph type = SCS Runoff Storm frequency = 25 yrs Time interval = 2 min Drainage area = 6.420 ac Basin Slope = 0.0 % Tc method = User Total precip. = 8.05 in Storm duration = 24 hrs * Composite (Area/CN) = [(3.300 x 98) + (3.120 x 39)] / 6.420 Q (cfs) 50.00 40.00 30.00 20.00 10.00 0.00 0 120 240 Hyd No. 1 Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor Post to Pond Hyd. No. 1 -- 25 Year 360 480 600 720 840 Tuesday, 06 / 13 / 2017 = 47.36 cfs = 716 min = 95,960 cuft = 69* = Oft = 5.00 min = Type II = 484 Q (cfs) 50.00 40.00 30.00 20.00 10.00 0.00 960 1080 1200 1320 1440 Time (min) Hydrograph Report 14 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Hyd. No. 2 Dry Pond Outflow Hydrograph type = Reservoir Peak discharge Storm frequency = 25 yrs Time to peak Time interval = 2 min Hyd. volume Inflow hyd. No. = 1 - Post to Pond Max. Elevation Reservoir name = Dry Pond Max. Storage Storage Indication method used Q (cfs) 50.00 40.00 30.00 20.00 10.00 0.00 0 600 Hyd No. 2 Dry Pond Outflow Hyd. No. 2 -- 25 Year Tuesday, 06 / 13 / 2017 = 0.218 cfs = 1444 min = 58,262 cuft = 13.53 ft = 86,416 cult 1200 1800 2400 3000 3600 4200 4800 5400 Hyd No. 1 Total storage used 86,416 cuft Q (cfs) 50.00 40.00 30.00 20.00 10.00 0.00 6000 Time (ruin) 15 Hydrograph Summary Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3138 2016 by Autodesk, Inc. v10.5 Hvd. Hydrograph type (origin) Peak flow (cfs) Time interval (min) Time to Peak (min) Hyd. volume (cuft) Inflow hyd(s) Maximum elevation (ft) Total strge used (cuft) Hydrograph Description 1 SCS Runoff 55.97 2 716 113,859 --- — ------ ---- Post to Pond 2 Reservoir 0.960 1 2 1022 74,594 1 13.66 89,644 I Dry Pond Outflow NCARNCRC- stormwater model.gpw Return Period: 50 Year Tuesday, 06 / 13 / 2017 16 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. 00.5 Hyd. No. 1 Post to Pond Hydrograph type = SCS Runoff Peak discharge Storm frequency = 50 yrs Time to peak Time interval = 2 min Hyd. volume Drainage area = 6.420 ac Curve number Basin Slope = 0.0 % Hydraulic length Tc method = User Time of conc. (Tc) Total precip. = 9.00 in Distribution Storm duration = 24 hrs Shape factor * Composite (Area/CN) = [(3.300 x 98) + (3.120 x 39)] / 6.420 Q (cfs) 60.00 50.00 F" 30.00 20.00 10.00 Post to Pond Hyd. No. 1 -- 50 Year Tuesday, 06 / 13 / 2017 = 55.97 cfs = 716 min = 113,859 cuft = 69* = Oft = 5.00 min = Type II = 484 Q (cfs) 60.00 50.00 40.00 30.00 20.00 10.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 - Hyd No. 1 Time (min) Hydrograph Report 17 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v1 U iyd. No. 2 Dry Pond Outflow Hydrograph type = Reservoir Storm frequency = 50 yrs Time interval = 2 min Inflow hyd. No. = 1 - Post to Pond Reservoir name = Dry Pond Storage Indication method used. 60.00 40.00 30.00 20.00 10.00 0.00 0 600 1200 Hyd No. 2 Peak discharge Time to peak Hyd. volume Max. Elevation Max. Storage Dry Pond Outflow Hyd. No. 2 -- 50 Year Tuesday, 06 / 13 / 2017 = 0.960 cfs = 1022 min = 74,594 cult = 13.66 ft = 89,644 cult Q (cfs) 60.00 50.00 40.00 30.00 20.00 10.00 0.00 1800 2400 3000 3600 4200 4800 5400 6000 Time (min) Hyd No. 1 Total storage used = 89,644 cuft 18 Hydrograph Summary Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Hyd. No. Hydrograph type (origin) Peak flow (cfs) Time interval (min) Time to Peak (min) Hyd. volume (cuft) Inflow hyd(s) Maximum elevation (ft) Total strge used (cuft) Hydrograph Description 1 SCS Runoff 65.12 2 716 133,131 — -- ------ - — - Post to Pond 2 Reservoir 2.126 2 832 93,829 1 13.72 91,326 Dry Pond Outflow NCARNCRC- stormwater model.gpw Return Period: 100 Year Tuesday, 06 / 13 / 2017 Hydrograph Report 19 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.'. ( iyd. No. 1 Post to Pond Hydrograph type = SCS Runoff Storm frequency = 100 yrs Time interval = 2 min Drainage area = 6.420 ac Basin Slope = 0.0 % Tc method = User Total precip. = 10.00 in Storm duration = 24 hrs Composite (Area/CN) = [(3.300 x 98) + (3.120 x 39)] / 6.420 Q (cfs) 70.00 J.00 -2 M 1 40.00 K9 10, 20.00 10.00 e I is Tuesday, 06113 12017 Peak discharge = 65.12 cfs Time to peak = 716 min Hyd. volume = 133,131 cuft Curve number = 69* Hydraulic length = 0 ft Time of conc. (Tc) = 5.00 min Distribution = Type II Shape factor = 484 Post to Pond Hyd. No. 1 --100 Year Q (cfs) 70.00 50.00 40.00 30.00 20.00 10.00 120 240 360 480 600 720 840 960 1080 1200 1320 Hyd No. 1 Time (min) Hydrograph Report 20 Hydraflow Hydrographs Extension for AutoCAD® Civil 31302016 by Autodesk, Inc. v10.f Hyd. No. 2 Dry Pond Outflow Hydrograph type = Reservoir Storm frequency = 100 yrs Time interval = 2 min Inflow hyd. No. = 1 - Post to Pond Reservoir name = Dry Pond Storage Indication method used Peak discharge Time to peak Hyd. volume Max. Elevation Max. Storage Tuesday, 06 / 13 / 2017 = 2.126 cfs = 832 min = 93,829 tuft = 13.72 ft = 91,326 cult Dry Pond Outflow Q (cfs) Hyd. No. 2 -- 100 Year Q (cfs) 70.00 70.00 Hydraflow Rainfall Report 21 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Return Period Intensity -Duration -Frequency Equation Coefficients (FHA) (Yrs) D - (N/A) 1 0.0000 0.0000 0.0000 ------ 2 69.8703 13.1000 0.8658 ------ 3 0.0000 0.0000 0.0000 -------- 5 79.2597 14.6000 0.8369 ------ 10 88.2351 15.5000 0.8279 ------ 25 102.6072 16.5000 0.8217 -------- 50 114.8193 17.2000 0.8199 ------ 100 127.1596 17.8000 0.8186 -------- File name: SampleFHA.idf Intensity = B / (Tc + D)^E Tuesday, 06 / 13 / 2017 Return Period Intensity Values (irdhr) (Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60 1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 5.69 4.61 3.89 3.38 2.99 2.69 2.44 2.24 2.07 1.93 1.81 1.70 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 6.57 5.43 4.65 4.08 3.65 3.30 3.02 2.79 2.59 2.42 2.27 2.15 10 7.24 6.04 5.21 4.59 4.12 3.74 3.43 3.17 2.95 2.77 2.60 2.46 25 8.25 6.95 6.03 5.34 4.80 4.38 4.02 3.73 3.48 3.26 3.07 2.91 50 9.04 7.65 6.66 5.92 5.34 4.87 4.49 4.16 3.88 3.65 3.44 3.25 100 9.83 8.36 7.30 6.50 5.87 5.36 4.94 4.59 4.29 4.03 3.80 3.60 Tc = time in minutes. Values may exceed 60. Precin. file name- Samnle_ncn Storm Rainfall Precipitation Table (in) Distribution 1-yr 2-yr 3-yr 5 yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 3.60 4.50 1.50 0.00 7.00 8.05 9.00 10.00 SCS 6-Hr 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff -1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Hydraflow Table of Contents NCARNCRC- stormwater model.gpw Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Tuesday, 06 / 13 / 2017 Watershed Model Schematic..................................................................................... 1 Hydrograph Return Period Recap............................................................................. 2 - Year SummaryReport......................................................................................................................... 3 HydrographReports................................................................................................................... 4 Hydrograph No. 1, SCS Runoff, Post to Pond......................................................................... 4 Hydrograph No. 2, Reservoir, Dry Pond Outflow..................................................................... 5 2 - Year SummaryReport......................................................................................................................... 6 HydrographReports................................................................................................................... 7 Hydrograph No. 1, SCS Runoff, Post to Pond......................................................................... 7 Hydrograph No. 2, Reservoir, Dry Pond Outflow..................................................................... 8 10 -Year SummaryReport......................................................................................................................... 9 HydrographReports................................................................................................................. 10 Hydrograph No. 1, SCS Runoff, Post to Pond....................................................................... 10 Hydrograph No. 2, Reservoir, Dry Pond Outflow................................................................... 11 25 - Year SummaryReport....................................................................................................................... 12 HydrographReports................................................................................................................. 13 Hydrograph No. 1, SCS Runoff, Post to Pond....................................................................... 13 Hydrograph No. 2, Reservoir, Dry Pond Outflow................................................................... 14 50 - Year SummaryReport....................................................................................................................... 15 HydrographReports................................................................................................................. 16 Hydrograph No. 1, SCS Runoff, Post to Pond....................................................................... 16 Hydrograph No. 2, Reservoir, Dry Pond Outflow................................................................... 17 100 - Year SummaryReport....................................................................................................................... 18 HydrographReports................................................................................................................. 19 Hydrograph No. 1, SCS Runoff, Post to Pond....................................................................... 19 Hydrograph No. 2, Reservoir, Dry Pond Outflow................................................................... 20 OFReport.................................................................................................................. 21 Job No. Job 2 � 7t� Wilmington i B Date: Jacobs Engineering Group Revisions 111 Coming Road, Suite 200 r No _-- Date Cary, NC 27518 _0 _ 21612D17 I ORY POND - Current Design Conditions MDC 1-5 The followino desi n is based on requirements set forth in Part C-12 of NCDEQ's 03 January 2017 version of "Stormwater Design Manual'. MDC 1 - SEPARATION FROM THE SEASONAL HIGH WATER TABLE The lowest point of the dry pond shall he a minimum of shr (B) Inches above the SHWT. The lowest point of the dry pond is at elevation 7.0, compared to SHWT elevation of 5.50 per documents sutxnitted under SW8 140906. MDC 2- TEMPORARY POOL DEPTH The maximum depth of the temporary pool shall be 10 feet. The total depth to top of dam Is less than 10 feet. 1) Calculate the design volume: Drainage Area =r_ 5A2 lacres _ CN Impervious Area =(— 3.30 acres j 98 I Pervious Area = ' ' � 3.12_4cres @ I J Composite: 6.42 acres @ 69 Find the volume of the 1.5" storm using the'Discrete NRCS Curve Number Method': S = 1000/CN - 10 Where: S = Maximum retention after rainfall begins (in) CN = Curare Number (unitless) Q* = (P-0.2S) -2 / (P + 0.13S) Where: Q* = Runoff Depth (In) P = Rainfall Depth (in) = r 1.5 inches S = 4.42 inches Q. = 0.08 inches Runoff Volume Q* x Area (sf) / 12 = 1750 cubic feet This volume is reached at approximately 0.25 feet above normal pool. 1.5' feet provided. MDC 3. UNIFORM GRADING AND POSITIVE DRAINAGE. The bottom of the dry pond shell be graded uniformly to flow toward the outlet structure without low or high spots other than an optional low flow channel. The pond Is graded to provide positive slope to a low -flow channel which leads to outlet structure. MDC 4 - LOCATION OF INLET(S) AND OUTLET. The inlet(s) and outlet shall be located in a manner that avoids short circuiting. The design includes a berm and a low -flow channel for lengthening flow path and preventing pond from short circuiting. MDC 5 - PRETREATMENT Pretreatment devices shall be provided to settle sediment and prevent erosion. Pretreatment devices may include measures such as gravel verges, filter strips, grassed awales, and forebays. The design includes Sand Filters upstream of the pond and riprap aprons at each of the two inlets as a pretreatment method. MDC G:\Clv1L\frornwdrIva\ArmyNationsl Guard- Wilmington (F8W72100)\SWM\Dry Pond Calculations.xls JACOBS Jacobs Engineering Group 111 Corning Road, Suite 200 Cary, NC 27518 Job No. F6W72100 Job Name NCARNG - Wilmington Date: 2/6/2017 Revisions No Date Description 0 2/6/2017 ; DRY POND - Current Design Conditions MDC 6 DRAWDOWN TIME Thefollowing design is based on requirements set forth in Part C-12 of NCDEQ's 03 January 2017 version of "Stormwater Design Manual". MDC 6 - DRAWDOWN TIME The design volume shall draw down between two and five days. Input Data Orifice Equation Orifice Diameter 2.C) in Orfice Coefficent 0.60 Q = C,, 2gh Volume Provided 17919 cf Number Orifices 1.00 g= 32.2 ft/s2 WQv Depth 1.50 h= use h/3 to simulate decreasing head A= cross section area of orifice Q= discharge cfs Calculated Data Co= orifice coefficient, 0.6 typ. Cross Sectional Area 0.022 sf Average head 0.500 feet Average Discharge 0.074 cfs Max. Discharge 0.235 cfs Drawdown Time = Volume/Flowrate Drawdown Time = 2.79 days MDC 6 G:\CIVIL\from w driveWrmy National Guard - Wilmington (FBW72100)\SWM\Dry Pond Calculations.xls n JACOBS Jacobs Engineering Group 111 Coming Road, Suite 200 Cary, NC 27518 Job No. F6W72100 Job Name NCARNG - Wilmington Date: 2/6/2017 Revisions Description 0 2/6/2017 7-9 7 - PROTECTION OF RECEIVING STREAM The dry pond shall discharge the runoff from the one-year, 24-hour storm in a manner that minimizes the hydrologic impacts to the receiving channel. Pre -development and Post Development Rates are as follows: Pre -Developed 1-Year 2-Year (cfs) 10-Year (CIS) 25-Year (cls) 50-Year (cir') 100-Year (cfs) 0.99 1.24 1.51 1.70 1.05 2.00 Post -Developed 1-Year ( 2-Year cfs 10-Year (cfs) 25-Year (cfs)( 50-Year ) 100-Year (cfs) 0.11 0.14 0.20 0.22 0.96 2.13 8 - OUTLET The dry pond shall include a small permanent pool near the outlet orifice to reduce clogging and keep floating debris away from the orifice. A screen or other device shall be provided to prevent large debris from entering the outlet system Design includes a small permanent pool near the outlet orifice, as well as an inverted siphon to reduce clogging. 9 - VEGETATION The dam structure, including the front and back embankment slopes shall be planted with non -clumping turf grass, and trees and woody shrubs shall not be allowed. Refer to final landscape plans for demonstration of compliance. MDC 7 - 9 G:\CIVIL\from w drive\Army National Guard - Wilmington (F6W72100)\SWM\Dry Pond Celculations.xls Watershed Model Schematic Hydraflow Hydrographs Extension forAutoCAD® Civil 3D® 2016 byAutodesk, Inc. v10.5 CD Legend Hyd. Origin Descriotion 1 SCS Runoff Post to Pond 2 Reservoir Dry Pond Outflow 2 Project: NCARNCRC- stormwater model (Future).gpw I Wednesday, 06 / 21 / 2017 Hydrograph Return Period Rep y ra ow Hydrographs Extension for AutoCAD® Civil 31302016 by Autodesk, Inc. v10.5 Mvd. Hydrograph type (origin) Inflow hyd(s) Peak Outflow (cfs) Hydrograph Description 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr 1 2 SCS Runoff Reservoir ------ i 1 17.84 0.287 26.00-------------- 0.346 --- model (Future).gpw 50.59 0.476 61.14 70.72 3.576 80.80 8.018 Post to Pond Dry Pond Outflow Proj. file: NCARNCRC- stormwater Wednesday, 06 / 21 / 2017 Hydrograph Summary Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Hyd. No. Hydrograph type (origin) Peak flow (cfs) Time interval (min) Time to Peak (min) Hyd. volume (cuft) Inflow hyd(s) Maximum elevation (ft) Total strge used (cuft) Hydrograph Description 1 SCS Runoff 17.84 2 718 35,754 ------ ------ — - Post to Pond 2 Reservoir 0.287 2 1118 35,534 1 10.70 24,534 Dry Pond Outflow NCARNCRC- stormwater model (Future).gp Return Period: 1 Year Wednesday, 06 121 / 2017 Hydrograph Report 4 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Hyd. No. 1 Post to Pond Hydrograph type = SCS Runoff Peak discharge Storm frequency = 1 yrs Time to peak Time interval = 2 min Hyd. volume Drainage area = 6.980 ac Curve number Basin Slope = 0.0 % Hydraulic length Tc method = User Time of conc. (Tc) Total precip. = 3.60 in Distribution Storm duration = 24 hrs Shape factor Composite (Area/CN) = [(4.550 x 98) + (2.430 x 39)] / 6.980 Q (Cfs) 18.00 15.00 12.00 M M 3.00 w Post to Pond Hyd. No. 1 --1 Year Wednesday, 06 / 21 / 2017 = 17.84 cfs = 718 min = 35,754 cuff = 77* = Oft = 5.00 min = Type II = 484 Q (cfs) 18.00 15.00 12.00 M M cm 0.00 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 1 Time (min) Hydrograph Summary Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Hyd. No. Hydrograph type (origin) Peak flow (cfs) Time interval (min) Time to Peak (min) Hyd. volume (cuft) Inflow hyd(s) Maximum elevation (ft) Total strge used (cuft) Hydrograph Description 1 SCS Runoff 26.00 2 716 52,510 ----- ------ ------ Post to Pond 2 Reservoir 0.34s 9 1166 52,185 39 38,203 Dry Pond Outflow NCARNCRC- stormwater model (Future).gp Return Period: 2 Year Wednesday, 06 / 21 / 2017 Hydrograph Report 6 Hydraflow Hydrographs Extension for AutoCAD® Civil 3DO 2016 by Autodesk, Inc. 00.! Hyd. No. 1 Post to Pond Hydrograph type = SCS Runoff Storm frequency = 2 yrs Time interval = 2 min Drainage area = 6.980 ac Basin Slope = 0.0 % Tc method = User Total precip. = 4.50 in Storm duration = 24 hrs Composite (Area/CN) = [(4.550 x 98) + (2.430 x 39)] / 6.980 Q (cfs) 28.00 _4.00 20.00 16.00 12.00 M 4.00 M Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor Post to Pond Hyd. No. 1 -- 2 Year Wednesday, 06 / 21 / 2017 = 26.00 cfs = 716 min = 52,510 cult = 77* = Oft = 5.00 min = Type II = 484 Q (cfs) 28.00 24.00 20.00 i• II 12.00 4.00 0.00 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 1 Time (min) Hydrograph Summary Report Hydraflow Hydrographs Extension for AutoCAD®Civil 3D® 2016 by Autodesk, Inc. v10.5 Hyd. No. Hydrograph type (origin) Peak flow (cfs) Time interval (min) Time to Peak (min) Hyd. volume (cuft) Inflow hyd(s) Maximum elevation (ft) Total strge used (cuft) Hydrograph Description 1 SCS Runoff 50.59 2 716 103,705 - ------ Post to Pond 2 Reservoir 0.476 I 2 1386 101,323 15 82,063 Dry Pond Outflow NCARNCRC- stormwater model (Future).gp fv Return Period: 10 Year Wednesday, 06 / 21 / 2017 8 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 ' iyd. No. 1 Post to Pond Hydrograph type = SCS Runoff Storm frequency = 10 yrs Time interval = 2 min Drainage area = 6.980 ac Basin Slope = 0.0 % Tc method = User Total precip. = 7.00 in Storm duration = 24 hrs Composite (Area/CN) [(4.550 x 98) + (2.430 x 39)] / 6.980 Q (cfs) 60.00 y1 11 40.00 30.00 rM 10.00 Wednesday, 06 / 21 / 2017 Peak discharge = 50.59 cfs Time to peak = 716 min Hyd. volume = 103,705 cuft Curve number = 77* Hydraulic length = 0 ft Time of conc. (Tc) = 5.00 min Distribution = Type II Shape factor = 484 Post to Pond Hyd. No. 1 --10 Year Q (cfs) 60.00 61i 1 I 40.00 30.00 20.00 10.00 0.00 120 240 360 480 600 720 840 960 1080 1200 1320 Hyd No. 1 Time (min) Hydrograph Summary Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. 00.5 Hyd. No. Hydrograph type (origin) Peak flow (cfs) Time interval (min) Time to Peak (min) Hyd. volume (cuft) Inflow hyd(s) Maximum elevation (ft) Total strge used (cuft) Hydrograph Description 1 SCS Runoff 61.14 2 716 126,376 ------ ----- ------ Post to Pond 2 Reservoir i i 1.480 I 2 894 122,494 1 13.68 90,121 Dry Pond Outflow NCARNCRC- stormwater model (Future).gly v Return Period: 25 Year Wednesday, 06 / 21 / 2017 Hydrograph Report 10 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v1 M iyd. No. 1 Post to Pond Hydrograph type = SCS Runoff Storm frequency = 25 yrs Time interval = 2 min Drainage area = 6.980 ac Basin Slope = 0.0 % Tc method = User Total precip. = 8.05 in Storm duration = 24 hrs * Composite (Area/CN) = [(4.550 x 98) + (2.430 x 39)] / 6.980 Post to Pond Wednesday, 06 / 21 / 2017 Peak discharge = 61.14 cfs Time to peak = 716 min Hyd. volume = 126,376 cuft Curve number = 77* Hydraulic length = 0 ft Time of conc. (Tc) = 5.00 min Distribution = Type II Shape factor = 484 13 Hydrograph Summary Report Hydraflow Hydrographs Extension for AutoCAD®Civil 3130 2016 by Autodesk, Inc. v10.5 Hyd. No. Hydrograph type (origin) Peak flow (cfs) Time interval (min) Time to Peak (min) Hyd. volume (cuft) Inflow hyd(s) Maximum elevation (ft) Total strge used (cuft) Hydrograph Description 1 SCS Runoff 80.80 2 716 169,501 ------ ------ - — - Post to Pond 2 Reservoir 8.018 2 742 165,557 I i 1 13.92 96,146 Dry Pond Outflow I i NCARNCRC- stormwater model (Future).gp Return Period: 100 Year Wednesday, 06121 / 2017 Hydrograph Report 14 Hydraflow Hydrographs Extension for AutoCAM Civil 31)02016 by Autodesk, Inc. v10.5 i Ayd. No. 1 Post to Pond Hydrograph type = SCS Runoff Peak discharge Storm frequency = 100 yrs Time to peak Time interval = 2 min Hyd. volume Drainage area = 6.980 ac Curve number Basin Slope = 0.0 % Hydraulic length Tc method = User Time of conc. (Tc) Total precip. = 10.00 in Distribution Storm duration = 24 hrs Shape factor * Composite (Area/CN) = [(4.550 x 98) + (2.430 x 39)] / 6.980 Post to Pond Wednesday, 06121 / 2017 = 80.80 cfs = 716 min = 169,501 cult = 77* = Oft = 5.00 min = Type II = 484 ill Hydraflow Rainfall Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Wednesday, 06 / 21 / 2017 Return Period (Yrs) Intensity -Duration -Frequency Equation Coefficients (FHA) -- -- B D E (N/A) 1 0.0000 0.0000 0.0000 ------- 2 69.8703 13.1000 0.8658 3 0.0000 0.0000 0.0000 -------- 5 79.2597 14.6000 0.8369 -------- 10 88.2351 15.5000 0.8279 -------- 25 102.6072 16.5000 0.8217 -------- 50 114.8193 17.2000 0.8199 -------- 100 127.1596 17.8000 0.8186 I ------ File name: SampleFHA.idf Intensity = B / (Tc + D)^E Return Period Intensity Values (in/hr) (Yrs) 5 min 10 1s 20 25 30 35 40 45 50 55 60 1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 5.69 4.61 3.89 3.38 2.99 2.69 2.44 2.24 2.07 1.93 1.81 1.70 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 6.57 5.43 4.65 4.08 3.65 3.30 3.02 2.79 2.59 2.42 2.27 2.15 10 7.24 6.04 5.21 4.59 4.12 3.74 3.43 3.17 2.95 2.77 2.60 2.46 25 8.25 6.95 6.03 5.34 4.80 4.38 4.02 3.73 3.48 3.26 3.07 2.91 50 9.04 7.65 6.66 5.92 5.34 4.87 4.49 4.16 3.88 3.65 3.44 3.25 100 9.83 8.36 7.30 6.50 5.87 5.36 4.94 4.59 4.29 4.03 3.80 3.60 Tc = time in minutes. Values may exceed 60. PreciD. file name: Samole.oco Rainfall Precipitation Table (in) Storm Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 3.60 4.50 1.50 0.00 7.00 8.05 9.00 10.00 SCS 6-Hr 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff -1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Custom 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Hydraflow Table of Contents NCARNCRC-stormwater model(Future).gpw Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Wednesday, 06 / 21 / 2017 Watershed Model Schematic..................................................................................... 1 Hydrograph Return Period Recap............................................................................. 2 1 -Year SummaryReport......................................................................................................................... 3 HydrographReports................................................................................................................... 4 Hydrograph No. 1, SCS Runoff, Post to Pond......................................................................... 4 2 - Year SummaryReport......................................................................................................................... 5 HydrographReports................................................................................................................... 6 Hydrograph No. 1, SCS Runoff, Post to Pond......................................................................... 6 10 -Year SummaryReport......................................................................................................................... 7 HydrographReports................................................................................................................... 8 Hydrograph No. 1, SCS Runoff, Post to Pond......................................................................... 8 25 - Year SummaryReport......................................................................................................................... 9 HydrographReports................................................................................................................. 10 Hydrograph No. 1, SCS Runoff, Post to Pond....................................................................... 10 50 - Year SummaryReport....................................................................................................................... 11 HydrographReports................................................................................................................. 12 Hydrograph No. 1, SCS Runoff, Post to Pond....................................................................... 12 100 - Year SummaryReport....................................................................................................................... 13 HydrographReports................................................................................................................. 14 Hydrograph No. 1, SCS Runoff, Post to Pond....................................................................... 14 OFReport.................................................................................................................. 15 JDat Nome 2/6/2017 Wilmington JACOB Jacobs Engineering Group Revisions 111 Corning Road, Suite 200 No Date Description Cary, NC 27518 0 2/6/2017 - DRY POND - Future Conditions MDC 1.5 The following design is based on requirements set forth in Part C-12 of NCDEQ's 03 January 2017 version of'Stormwater Design Manual". MDC 1 - SEPARATION FROM THE SEASONAL HIGH WATER TABLE The lowest point of the dry pond shall be a minimum of six (6) Inches above the SHWT. The lowest point of the dry pond is at elevation 7.0, compared to SHWT elevation of 5.50 per documents submitted under SW8 140906. MDC 2 - TEMPORARY POOL DEPTH The maximum depth of the temporary pool shall be 10 feet. The depth of the temporary pool is approximately 1.2 feet. 1) Calculate the design volume: Drainage Area = l� s.98_ acres CN Impervious Area =�_ 4.55 acres @ _98 Pervious Area I 2.43 aacres @ 39_J Composite: 6.98 acres @ 77 Find the volume of the 1.5" storm using the "Discrete NRCS Curve Number Method": S = 1000/CN - 10 Where: S = Maximum retention after rainfall begins (in) CN = Curve Number (unitless) Q* = (P-0.2S) - 2 / (P + 0.8S) Where: Q* = Runoff Depth (in) _ _ _ P = Rainfall Depth (in) _inches S = 2.91 inches Q* = 0.22 inches Runoff Volume = Q* x Area (si) / 12 = 5578 cubic feet This volume is reached at approximately 0.6 feet above normal pool. 1.9 feet provided. MDC 3 - UNIFORM GRADING AND POSITIVE DRAINAGE. The bottom of the dry pond shall be graded uniformly to flow toward the outlet structure without low or high spots other than an optional low flow channel. The pond is graded to provide positive slope to a low -flow channel which leads to outlet structure. MDC 4 - LOCATION OF INLET(S) AND OUTLET. The Inlet(s) and outlet shall be located in a manner that avoids short circuiting. The design includes a berm and a low -flow channel for lengthening flow path and preventing pond from short circuiting. MDC 5-PRETREATMENT Pretreatment devices shall be provided to settle sediment and prevent erosion. Pretreatment devices may include measures such as gravel verges, filter strips, grassed swales, and forebays. The design includes Sand Filters upstream of the pond and riprap aprons at each of the two inlets as a pretreatment method. MDC 1-5 G:\CIVIL\fmm w dri"Wmy National Guard - Wilmington (FGv 72100)\SWM\Dry Pond Calculations (lutum).xls JACO B., Jacobs Engineering Group 111 Corning Road, Suite 200 Cary, NC 27518 Job No. F6W72100 Job Name NCARNG - Wilmington Date: 2/6/2017 Revisions No D_ate Description 0 2/6/2017 _ _. 1 . DRY POND - Future Conditions MDC 6 DRNDOWN TIME The followin desi n is based on re uirements set forth in Part C-12 of NCDEQ's 03 January 2017 version of "Stormwater Design Manual". MDC 6 - DRAWDOWN TIME The design volume shall draw down between two and five days. Input Data Orifice Equation Orifice Diameter 2.0J in OrficeCoefficent 0.60 Q—C.A 2gh Volume Provided 17919 of Number Orifices 1.00 g= 32.2 ft/S2 Qv Depth 1.50 h= use h/3 to simulate decreasing head A= cross section area of orifice t7= discharge cfs Calculated Data Co= orifice coefficient, 0.6 typ. Cross Sectional Area 0.022 sf Average head 0.500 feet Average Discharge 0.074 cis Max. Discharge 0.235 cis Drawdown Time = Volume/Flowrate Drawdown Time = 2.79 days MDC 6 G:\CIVILtfrom w driveVArmy National Guard - Wilmington (F6W72100)\SWM\Dry Pond Calculations (future).xls JACOBS Jacobs Engineering Group 111 Corning Road, Suite 200 Cary, NC 27518 Job No. Job Name F6W72100 NCARNG - Wilmington Date: 2/6/2017 Revisions No Date Description 0 2/6/2017 I 1- Future Conditions MDC7-9 7 - PROTECTION OF RECEIVING STREAM The dry pond shall discharge the runoff from the one-year, 24-hour storm in a manner that minimizes the hydrologic impacts to the receiving channel. Pre -development and Post Development Rates are as follows: Pre -Developed 1-Year (cfs) 2-Year (cfs) 10-Year (cfs) 25-Year (cfs) 50-Year cfs 100-Year cfs 0.99 1.24 1.51 1.70 1.85 2.00 Post -Developed 1-Year (cfs) 2-Year (cfs) 10-Year (cfs) 25-Year I (cfs) 50-Year cfs 1 100-Year cfs 0.03 0.35 0.48 1.48 3.58 8.02 8 - OUTLET The dry pond shall Include a small permanent pool near the outlet orifice to reduce clogging and keep floating debris away from the orifice. A screen or other device shall be provided to prevent large debris from entering the outlet system Design includes a small permanent pool near the outlet orifice, as well as an inverted siphon to reduce clogging. DC 9 - VEGETATION The dam structure, including the front and back embankment slopes shall be planted with non -clumping turf grass, and trees and woody shrubs shall not be allowed. Refer to final landscape plans for demonstration of compliance. MDC 7 - 9 G:\CIVILNfrom w drlve�Army National Guard - Wilmington (F6W72100)\SWM\Dry Pond Calculations (future).xls Job No. F6W72100 'R _r� Ian �J Jacobs Engineering Group Raleigh Operations - North American Infrastructure 111 Coming Road, Suite 200 Cary, NC 27518 Job Name NCARNG - Wilmington Date: 6/21 /2017 Revisions No Date Description ^ 0 ! 6/21/2017 y l.- ANTI-FLOATATION CALCULATIONS DETERMINE BOUYANT FORCES Volume = Depth * Area Depth = Riser Top Elev - Riser Bottom Elev Riser Top Elev. = 13.6 ft Riser Invert Elev. = 9.00 ft Riser Bottom Elev. = 6.00 ft Riser Wall Thickness = 5.00 in Riser Bottom Thickness = 36.00 in Diameter of Manhole = 4.00 ft Area = pi * diameterA2 / 4 Area (@ outside diam)= 18.35'sf Volume = 1.3.9.Y44 . cf times wt of water 62.4 Ibs/cf Bouyant Force = 8,701 'Ibs DETERMINE COUNTERWEIGHT REQUIREMENTS Riser Top Top Elevation = 11.6. Thickness = 0 inches Outside Diam = 4.83 ft Volume= 0.00 ;cf Riser Walls Inside Diam = 4 00 ft Wall Thickness = 5.00.in Height = 7.60. ft Perimeter Length= 15:18. Volume = 115.34 . cf Riser Bottom Bottom Elevation = 6.00 Inside Diam = 4:00 ft Thickness= 3E.OD :in Volume = $7 70 cf Total Volume = 153 04 :cf times unit weight of reinforced conc. 150 Ibs/cf Counterwelght = 229;9$6 'Ibs Factor of Safetv Provided (FSP) = 264 FSP < 1.30, Additional Concrete Required ditional Concrete for Anti -floatation regd: 0 Ibs Anti -Floatation G:\CIVIL�from w drive\Army National Guard - Wilmington(F6W72100)\SWM\ant'rfloatation.)ds aniage-rdliew'd P,-,nd Frosio,47& Indw Appendix E. NCDEQ Stormwater Forms 0 Supplement - EZ Form ( �.M Qovec") 0 Signatory Authorization Letter NATIONAL GUARD BUREAU ECEIVE SATTEW"ONDF U.S. PROPERTY & FISCAL. OFFICE FOR NORTH CAROLINA fUL4201 Reedy Creek RoadZ ��� Raleigh, NC 27607-6412REPLYTO NGNC-PFO 10 October 2014 MEMORANDUM FOR LTC Rodney Newton, Facility Manager Officer (FMO),JFHQ-NC, Raleigh, NC 27607-6410 SUBJECT: Appointment as Assistant United States Property and Fiscal Officer for Real Property 1. Pursuant to 32 U.S.C. 708 and NGR 130-6/ANG136-2 you are appointed the Assistant United States Property and Fiscal officer for Real property for the North Carolina Army National Guard (Assistant USPFO NCARNG). 2. Your duties as Assistant USPFO NCARNG are outlined in the above cited statute and regulation and will include, but not be limited to, the following: a. Ensure oversight and accountability program are in place and functioning properly to safeguard all Federal real property Issued to, under the control of or managed by the NCARNG. ' b. Establish and maintain -all necessary property records and implement ail procedures outlined in the applicable DoD, Army, and ARNG instructions and directives to account for and manage all Federal Real Property issued to, under the control of, or managed by the NCARNG. c. You willprovide me a monthly report which includes, but is not limited to, information regarding military construction projects. SRM projects, real,estate frnsfers, functions and operations, support agreements, joint use agreements, and such other information as directed by me and/or the Deputy USPFO. d. To assist me in performing my statutory and regulatory duties, you are directed to report any discrepancies or violations related to federal property and funds issued to, under the control of, or managed by -the. NCARNG. Your report must be submitted immediately upon discovery of any such discrepancy or violation. To ensure that accurate and timely information is provided regarding Federal property and funds, I have listed below my USPFO Critical Information Requirements (CCIR). You will submit to me, with a copy furnished to the Chief of Staff, a report that includes, but is not limited to, the following: I. The misuse or intentional damage or destruction of Federal property issued.to, under the control of, or managed by the NCARNG. ii. The theft or intentional taking of Federal property issued to, under the control of, or managed by the NCARNG by any individuai'or organization. III. Any adverse financial issues that have the potential to create a question of financial integrity within a system, area, or of a person. NGNC-PFO 10 October 2014 SUBJECT: Appointment as Assistant United States Property and Fiscal Officer for Real Property iv. Potential violations of the Anti -Deficiency Act (ADA). v. Congressional Earmarks and Directed Funding that conflict with applicable statutes, regulations and policies. vii. Issues or incidents involving Federal property issued to, under the control of, or managed by the NCARNG that has or has the. potential of creating adverse actions involving state or Federal political leadership. . 3. Your assignment as the Assistant USPFO NCARNG requires that you maintain at a minimum the following training requirements: NGB Fiscal Law Cources (every 3 .years); NGB Cooperative Agreement Course (every 3 years); ARNG Resource Management Course (every 5 years); DFAS Certifying Officers Legislation Course (online)(every 3 years); and USPFO Money Managers Training (local USPFO office)(annually). Your failure to maintain these training requirements will result in your removal as the Assistant USPFO NCARNG. 4. The delegation of your authority tQ other personnel under your supervision, to sign and authenticate documents/correspondence committing Federal funds or resources related to performance of duties identified herein is authorized. When such delegation os issued, provide a list of personnel Toni Coats, LTC, FMO, to me indicating the extent of signature authority delegated to each individual named PETER F. V SFELD COL, NGB USPFO for NC DISTRIBUTION; 1-Individual Concerned 1-NCNG-PFO AA (Duty Asgn File) 1-NCNG-PFO-CO f3t;�nnvvater 14annagenriant Ero-'sk)l I co-i-AUxA, FterQif Appendix F. NCDEQ Erosion Control Forms and Calculations • Express Review Financial Responsibility Form • Riprap Outlet Calculations PIVE&U�eJ pvVCW C-Ag-C—L- PCX ,0V.r,V,1Ve JUL It 20 IM41W 1Mh%-P Job No. F6VV721 00 JACOBS' Job Name NC RNG Wilmington Date: 613 017 Outlet: SD-1 Revisions "" "" No bate- -Description I NEW YORK DEPARTMENT OF TRANSPORTATION METHODOLOGY Input Values Diameter(in) 24 Flow Rate (cis) 12.59 s Slope (%) 7 °40 Sit ro4�7 W • Do + VALa outlet W - Do + La Manning Coef. pipei P1pa a Hin- dfameter (Da lj La � Diamter, Do t Conversions r, a.iCo L+ Diameter (it) 2.000 t 0.500 Radius (ft) 1.000 Flow Rate (ars) 12.590 r res:n NOT USED Slope (ft/ft) 0.080 Area (sf) 3.142 Calculated Data Normal Depth (ft) 1.70 Diaoram of Outlet Apron Outlet Velocity (fps) 9.80 Sediment Control Planning and Design Manual Section 8.0-Appendix NYDOT Dissipator Methodology 0 tfl' 1S 2D' U1A.�tETEP ;P,.) Zone = 2 (Zone 2 used as minimum) y APRON MATERIAL LENGTH LW APRON TO PROTECT CULVERT Lr TO PREVENT SCOUR HOLEUSE L2ALWAYS L2 1 87011E FILLING (FINE) CL A 3 X DQ 4 x Q. 2 STONE FILLING (LIGHT) CL. B 3 X Do 3 STONE FILLING (MEDIUM:) CL 1 4 X `S $ x q 4 &TONE FILLING (REAVY) CL I 4 X n- m x D, 5 STONE FILLING (HEAW) CL 2 5 X D_ _. s El. $ 'TONE FILLING (HEAS+Y) CL- 2 6 X D; llo x G, 7 SPECIAL STUDY REQUIRED IENERGY DISWRATORLS, STILLING BASIN OR LARGER 3M SMX Classification Average Diameter (in) Stone Class Minimum Thickness (in) Fine 3 A 12 Light 6 B 18 Medium 13 1 24 Heavy 23 2 36 Summary of jtig Pim are LenglhofApron= 12' ft W4114 Apron w 7 ft Glasgdwabofi = 11*14T NWQT Stone Class = B Mm Ttli*nm = to rn Dimensions used may be irregular due to configuration but exceed the above. SDA GXIVIUfrom w driveArmy National Guard - Wtmington (F6W72100)1SWM1Rip-rap outlet SD•1.xls Job No. F6W721 00 is Job Name N ARNG Wilmington Date: 6/13/2017 Outlet: SD-20 Revisions No Date i Description NEW YORK DEPARTMENT OF TRANSPORTATION METHODOLOGY Input Values Diameter (in) Flow Rate (cfs) 24 6.32e 3 0 Slope (%) 0.750 Outlet ` ' iyq + 0.4La outlet w • Dp « La Manning Coef. 0.013 pipe ,.i Pipe 2 Min. diameter(06)` Diameter, Da i Conversions 6zT�jira�er - ADa La ._y < 0.5Do Diameter (ft) 2.000 Radius (ft) 1.000 NOT USED USED Flow Rate (cis) 6.320 Slope (fVft) 0.008 Area (sf) 3.142 Calculated Data Normal Depth (ft) 1.70 Diagram of Outlet Apron Outlet Velocity (fps) 5.71 z 2( 0 o' North Carolina Erosion & Sediment Control Planning and Design Manual Secdon 8.0 -Appendix NYDOT Dissipator Methodology a�■■a■■re■■a ■ 7t�R a I�■��gv ■ax r� [�.■� ■moo■■r■a■.mom ■mQ asp a■wco v0me■�■®■r■■mru ■�sme., •�amo .o ,.® ■„a.■mom-®rmuoeu..4n+ ■.u.■■■.... ■■r■ ,sin ®..mam�as.■■■■■uor► ■,u.4pa►m �--. 1 �11���ai�l■i�r��_ Yam.-'�_a'a. �a■]lasv a■S�a ems®rfllil®aw■.v■■Rarilr■rrw■1a'a■ �ti■o■■�f■�-�mu�■n4t■tuf a■. r�■,■ee��vams■■■a■�mz�.■■■■�.,nr■■. �uoo.�tm�waa.. -vim■■aorr■■ ■ava■.r■■■�pe■®t■■■■■�-vnou�■ m■oav■■rA>�a�"�a�oe■.�v� ■�m■;Y■�aa■■m■a�ra�■a■� ra■a 5' 10, IF 20' 25 DIAMETER (Ft.) Zone = 2 (Zone 2 used as minimum) LU t"S APRON MATERLA.L LENGTH OF APRON TO FROT_C-T CULVERT Li TO PREVEKr SCOUR HOLE USE 1.2ALWAYS L2 1 C-TONE FILLIN*,B F'INM= CL A 3 X P,, 4 xo, 2 STONE FILLIMO (F ICK47 CL B 3 X 0, 6.x 0. 3 STONE FILLING WEDIL% CL 1 4 X Da 8 x D, 4 S ONEFLUNG %-IEAVY, CL.'f 4X0a SxD, 5 gTONE FlLLI'I1'JC; syEAVY) CL 2 5 X !Da 10 x Dm 6 STONE FILLING (HEAVY) CL 2 6X0. 10 x D, 7 SPECIAL STUDYREQL�'.l •L1 ENERGYDISSIPATORS,STILLING BASIN OR LAR3ER'S•'= STOVEX on Average Diameter (in) Stone Class Minimum Thickness in kFine 3 A 12 6 B 18 13 1 24 23 1 2 36 Summary of Rip Rap Apron Length of Apron = 12 ft Width of Apron = 14 ft Classification = LIGHT NCDOT Stone Class = B Min Thickness = 18 in Dimensions used may be irregular due to configuration but exceed the above. SD-20 G:ICIVILIfrom w ddve\Army National Guard - Wilmington (F6W72100)1SWMIRip-rap outlet SD-20.xls AL Job No. FSW72100 Job Name NCARNG Wilmington Date: 6/13/2017 Outlet: SD-30 Revisions r _ No I Date— i ` bescripiion I NEW YORK DEPARTMENT OF TRANSPORTATION METHODOLOGY Input Values Diameter (in) 18 300 3 Flow Rate (ds) 0.22 0 Slope (%) 0.500 Outlet Y - Do . o.aL Outlet N - Do + La Manning Coef. 0.013 pipe diarne1w (Do)(,a.,�.-., •1� —.) Pipe Diameter, Do 2 Min. Conversions i�, 50� Le ----w Diameter (ft) 1.500 ����— 0.5Do Radius (ft) Flow Rate (ds) 0.750 0.220 NOT USED USED Slope (ft/ft) 0.005 Area (sf) 1.767 Calculated Data Normal Depth (ft) 1.28 Diagram of Outlet Apron Outlet Velocity (fps) 3.85 iT iD+ 1D- Erosion 81 Sediment Control Planning and Design Section B.0-Appendix NYDOT Dissipator Methodology �1 ri QaS�Zfrr1a11TiQQlaltip®aaliQa ■.alalLQaaa ,�.0 Qaa� rlO[Yrllll. ■11Y�II�QL :tlovo*Qa■girl tall■ riir rQ■rr ■ra■1�®a■�mQ �a ®i11�■ a^.a Q■.v11aQ1=Q . rs��rr■rraimlQsaaaorar�m®■m ur■QaQam�■■maua a, mQ.11QarlSflallQllaQrlYYi[IQrirr■OQZr ii■ ro■rxrao ur. r, sr�rrrrrrrro ai�[rrn u �ruicrr r■asaorruru.rrrrrrrals,rr..urrrsi■a rQirrrr■ii■rut rrvurrurr■..srrr f< l.srrrYCril'.YQQr'..rrrrrrwr.AlRp}1#IRrrl�lra 1 R, R'iiaaii.'!!ii![1l rQ■QQ[lQliii■a■1I0 RQQ ux Ir:vrrrQ■r>azurm nr ma'eaQoaraam■Qalaau■®�■n is m'■d-.arQ:Faaa®zma Q cc tiO.aul■s�Y-ii=1 11`t 0■I�Q�.Ir■! oaQQ111�'rlRftl��7i'■■p 1rQ ®zQaQaf�am■zma uQcvlQa®vl■aaQ-.aauaaum.a.a rr: �ami®-Q.ua�p m �aa=.v■■m.zmnlrm[ri i■i�■mauQaar. u..,�Q.mQrraa uui■r[nulriiiv �m r,�rurn�r■1c.Q�lua r■a.�rur�arrruvuraauQ■a ..ail-J..1mO1aYY.■�u...aQ.o Q.lrwazmrrQurrrQ■ra .'■1 �11Q1Q1�`aalu Qll■\71i■r■[ill[lrl■r rroirrrrr a ium■■lc�.�-a■■rill�walrva■r.i■vQm on cir„Qurucar�-vomn_�®Qu:rumu� ra:l t3Ci.f!■lrrrtavl Or\iia■tas�®Qlrilli.1110i1 u� il�ln.�li■aoavaQl.�aQlvaaaaam■ [m aaaia®�Q■ra��almr.��rsrra. �■a[aan*rQaian.[11iQr■ru--== - - ---« Ql aZ�.R■�iQ�^..rirlQli�ra■�■■ifClllay �Of \f1L■!'llt■11aaQrl rl 1RQQi■m1Q1■QQQQQ rlu.u•A:ra'iQrr�y !ra. ..rr. u:C/.i ol�-r■r■lrrrrr [lr■\.ir![■■■►OQ■■a■■Qai■ .rrr.rvrrrar _ �iailQr■[■ill■uuir rQ um[a.1000�-ri rlrawuuo.rirrQrruui■ oQ■ ii� �s.rvi�trarlltlr�'ar.rr[usrr■au 'm �iu�iuiiiiiourr a��irarrrrrr.o..Q :sacv.rr�►ra�■i■Qrr.rr__vi.s■.rrurur ;■u aQiQa■a■.►-vimQ■Qla■1�QQQaQu ;u■ urm�■QaQusa.rrr■mallrcv.n.-aQQm. ur rim■.r■1■.aaQ:r■r®aa.m®r�iQar Our Qal■=AlatllZlp�■aa.r3amaaa=►�Qra ■■lim■.�rmil it rrgQlQrlraTQQi■1><r■1tQ 0 f— Our rlr�e Zone = 1 1 1 1 tc is 20 as D-A%lE7--R (FL) 2 (Zone 2 used as minimum) W APRON MATE�IL LENGTH OFAPRON TC P-ROTE`ZIT 'AKNERT Lr IT"N PREVENT SCOUR LEUBEL2ALWAYS L2 7 STONE FILLING (FINE? CL A 3 X ra, 4 x D. 2 STONE FILLING (LIGHT) CL. B 3 X Dr, 6 x D. 3 STONE FILLING O&D1M CL.1 4 X Do 8 x De 4 STONE FILLING (tt€MM CL 1 4 X D! a x D. 5 STONE FILLING (HEQVVI- 2 5XD[ 10 x Do 6 STONE FILLING i-IEAL-Y;• CL, '2 .6 X Dq 10 x Da 7 SPECIAL STUDYREQUIRED(ENEROYMSSIPATOR3,STILLWG B481N OR LrAR13ER SIZE STON Classfication Average Diameter (in) Stone Class Minimum Thickness (in) Fine 3 A 12 Light 6 B is Medium 13 1 24 Hea 23 2 36 Suinmatv,of Rio Ran Aaron Lena mfApron- 1) ft width d Apron = 11 ft 0las3rfi Wil = LIGHT NCDOT Stone Glass B Min. Tbickness = 1F8 in Dimensions used may be irregular due to configuration but exceed the above. SD-30 G:UVIL*om w driveWmy National Guard -Wilmington (F6W72100)1SWM1Rip-rap outlet SD-30.x1s J�BS Job Name N ARNG Wilmington Date: 6/13/2017 Outlet: SD-40 Revisions No'- Date Description NEW YORK DEPARTMENT OF TRANSPORTATION METHODOLOGY Input Values Diameter (in) Flow Rate (cfs) 24 23.91Or — i 3 ° Slope (%) 0.410 Ou0st WOo + 0.41,a outlet a D° + La Manning Coef. 0.013 plea*t— ��r(Do) L--�-- —,i viam Diameter. D° 2 xt.. t Conversions it-5D° La --w w ter D.5D° Diameter (ft) 2.000 Radius (ft) 1.000 Flow Rate (cfs) 23.910 USED NOT USED Slope (fVft) 0.004 Area (sf) 3.142 Calculated Data Normal Depth (ft) 1.70 Diagram of Outlet Apron Outlet Velocity (fps) 4.22 2( a Erosion & Sediment Control Planning and Design Man Secfion B.0 - Appendix NYDOT Dissipator Methodology �`��,■"""wr"�"'®® mar - ®�ee i■>er� �i o■rru■avm■■mzm�■�oa�so® ■m�t'mrmn■a�a �nr..■.-a.�m®o■■.r�ma ■�■>v m. �®�wmar ■m a�sv■a=.vm®sm mom` ono ® a�.��amo®tfuiur�u�aa� sm■ai®gym Ot�A ■■Q.BItm>f■�`m. mil isa n■o ■■>oaatVr■-ma■��oFa vnsa .ea�rioae�a >�o�■e ■m ora■,Ao;ie.�■aawaaraauonowsi m nry ■1 alo�w!-�aaa■�`1ar�w■rs� mv�■mv�cm-®o� mu s0Y\>Inlrt>aa�l� ua\ mm.Qaa■■■>va �omQ.Qu,,s..,��■,.■ m �ue�a� ,s.or H■■a�m 1(■lift■1101■!R ■..�...•.o.�_ -.gym:■.; t 0 V 10' t8 W 2F DIAMETER (Ft.) Zone = 2 (Zone 2 used as minimum) APRON MATERIAL LENGTH OF APRON TO FaFiOTSCT CUL;VE tT Li TO PRE4EN aCOUP HOLE USE LZAUIV ors L2 1 S70NE FILLING (FINE) CL A 3 X'Da »'.t D, STONE FILLING (LIGHT) CL B 3 X iDt C t ?, 3 STONE FILLING (MEDIUM) CL 1 4 X:D, S x Dr STONE FILLING (HEAVY) CL. 1 4 X D, S a 5 STONE FILLING (HEAVY) CL. 2 1 5 X Dr 10 a: L?, 6 STONE FILLING (HEAVY) CL. 2 6 X D° lox D, 7 SPECIAL STUDY REQUIRED (ENERGY DISSIPATORS, STILL Y3 BASIN OR L,,RGER &ZE STONE). Classification Average Diameter (in) Stone Class Minimum Thickness in Fine 3 A 12 Light 6 B 18 Medium 13 1 24 Heavy 23 2 36 Summary of Rip Rao Apron Length of Apron = 12 ft Width of Apron = 7 ft Classification = LIGHT NCDOT Stone Class = B Min Thickness = 18 in Dimensions used may be irregular due to configuration but exceed the above. SD-40 G:ICIVIL1from w driveWmy National Guard - Wilmington (FBW72100)1SWM1Rip-rep outlet SD-40.xls Job No. F6W721 00 BS Job ame N 72017 Date: Jacobs Engineering Group Revisions Raleigh Operations - North American Infrastructure 111 Coming Road, Suite 200 No7 Date Description _ Cary, NC 27518 AAA CHANNEL LINING DESIGN - TEMPORARY DIVERSION @ SOUTH END OF SITE CHANNEL FLOW DATA AREA = 4.20 (Ac.) C = 0.50 INTENSITY= 7.23 (in/hr)10 year storm FLOW = 15.18 (cfs) DESIGN CRITERIA CHANNEL LINING: Mannings'n' linings N = SLOPE= 0.028 (Mannings W) 0.010 (ftift) n vacua for Oopzn Ranges'} Z REQUID= 2.85 &4.5 R 11 -tt tt M = 2 :1 (sideslope) Uning Typo CHANNEL DIMENSIONS Woven Paper Net 0.016 moNit 0.a2a 0A15 0.022 OV S 0.014 FLOW DEPTH 1.00 (ft) FiberOWes Roving 0.on a.o21 0.019 WIDTH = 2 (ft) Bottom Width StrswWith Not O.M Curled Wand Mat o.M 0.033 0.035 0.025 0.028 FREEBOARD = 0.75 (ft) 5yntha0c neat 0.036 0.025 0.021 TOTAL DEPTH = 1.75 (ft) • A6pwd rmm: FHWA.ttFC 13. Pg. 37. April 1988 TRACTIVE FORCE T =Y'D'S Tractive Force (#/sq ft) Y = WEIGHT OF WATER (62.4#/cf) D = DEPTH OF FLOW IN CHANNEL (ft) S = SLOPE OF CHANNEL (Wit) T = 0.62 (#/sq ft) Permissible Unit Shear Stress, Td Lining Categoxy Lining Type (lb/ft2) Temporary Woven Paper Net 0.15 Jute Net 0.45 Fibreglass Rolling: Single 0.60 Double 0.85 Straw with Net 1.45 Curled Wood Mat 1.55 Synthetic Mat 2.00 dso Stone Size (inches) (lb/ft2) Gravel Riprap #57 0.5 0.25 #5 0.75 0.50 Rock Riprap Class A 4 1.00 Class B 8 2.00 Class 1 10 3.00 Class 2 14 4.00 Adapted from (PADEP,2000) Z ACTUAL AREA = 4.00 (sq/ft) W P = 6.47 (ft) R = 0.62 Z ACTUAL = 2.90 MUST BE > THAN Z REQ'D. = 2.85 V = 3.86 (ft/sec) LINING REQ'D CHANNEL DESIGN SECTION LINING: Double Straw Net 0.85 #/sq ft > 0.62 #/sq ft (TOPWIDTH) OK 9 ft rc,p Max Check Dam Spacing 1 ......... ..... . _ . _ .t Ditch blope 0.01 ft ft (DEPTH) Depth to 10-YR 1 ft � a---- Check Dam Height 1 ft 3 - �1=---f � � Length Between Check Dams 100.00 ft 2 ft (BOTTOM WIDTH) "Irlent ,1 ; `' i /'. n- � y3 1 Appendix G. Previous Stormwater & Erosion Control Permit Documents Prepared by Tripp Engineering Documents for Stormwater Management Permit No. SW8 1400906 • Documents for Erosion Control Permit No. NEWHA-2015-007 A� RCDENR North Carolina Department of Environment and Natural Resources Pat McCrory Governor October 14, 2014 LTC Rodney Newton State of North Carolina through the NC Dept. of Public Safety, NC National Guard 1636 Gold Star Dr. Raleigh, NC 27.607 Subject: Stormwater Management Permit No. SW8140906 Wilmington Readiness Center Renovation North Carolina National Guard High Density Commercial Infiltration Basin Project New Hanover County Dear LTC Newton: John E. Skvarla, III Secretary The Wilmington Regional Office received a complete State Stormwater Management Permit Application for Wilmington Readiness Center Renovation North Carolina National Guard on October 13, 2014. Staff review of the plans and specifications has determined that the project, as proposed, will compiy with the Stormwater Regulations set forth in Session Law 2008-211 and Title 15A NCAC 2H.1000. We are forwardding Permit No. SW8140906 dated October 14, 2014, for the construction, operation and maintenance of the BMP's and built -upon area associated with the subject project. This permit shall be effective from the date of issuance until October 14, 2022, and shall be subject to the conditions and limitations as specified therein. Please pay special attention to the conditions listed in this permit regarding the Operation and Maintenance of the BMP(s), recordation of deed restrictions, certification of the BMP's, procedures for changing ownership, transferring the permit, and renewing the permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system, to record deed restrictions, to certify the BMP's, to transfer the permit, or to renew the permit, will result in future compliance problems If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing by filing a written petition with the Office of Administrative Hearings (OAH). The written petition must conform to Chapter 150B of the North Carolina General Statutes, and must be filed with the OAH within thirty (30) days of receipt of this permit. You should contact the OAH with all questions regarding the filing fee (if a filing fee is required and/or the details of the filing process at 6714 Mail Service Center, Raleigh, NC 27699-6714, or via telephone at 919-431- 3000, or visit their website at www.NCOAH.com. Unless such demands are made this permit shall be final and binding. If you have any questions, or need additional information concerning this matter, please contact Kelly Johnson in the Wilmington Regional Office at (910) 796-7331. Sincerely, Tracy Dis, P.E., Director Division of Energy, Mineral and Land Resources GDS/kpj: G:IWQ1Shared1%tormwateAPermits & Projects120141140906 HDX201410 permit 140906 cc: Mr. Phillip G. Tripp, PE Inspector, New Hanover County Building Inspections New Hanover County Engineering Division of Coastal Management Wilmington Regional Office Stormwater File Division of Energy, Mineral, and Land Resources Land Quality Section — Wilmington Regional Office 127 Cardinal Drive Extension, Wilmington, North Carolina 28405 - (910) 796-7215 / Fax: (910) 350-2004 State Stormwater Management Systems Permit No. SW8 140906 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF ENERGY, MINERAL AND LAND RESOURCES STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY COMMERCIAL DEVELOPMENT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO State of North Carolina through the NC Department of Public Safety, NC National Guard Wilmington Readiness Center Renovation North Carolina National Guard 2412 Infantry Rd, Wilmington, New Hanover County FOR THE construction, operation and maintenance of one (1) infiltration basin in compliance with the provisions of Session Law 2008-211 and 15A NCAC 2H .1000 (hereafter the "stormwater rules') and the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved by the Division and considered a part of this permit. This permit shall be effective from the date of issuance until October 14, 2022, and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS 1. This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.8 of this permit. The stormwater control has been designed to handle the runoff from 148,565 square feet of impervious area. 3. The basin has been designed to handle the 10 year 24 hour design storm without discharging therefore neither an LSNFS nor an offline bypass are required. The tract will be limited to the amount of built -upon area indicated in Section 1.8 of this permit, and as shown on the approved plans. The built -upon area for the future development is limited to 0 square feet. The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system. 6. The project shall provide a 50' wide vegetated buffer adjacent surface waters, measured horizontally from and perpendicular to the normal pool of impounded structures, the top of bank of both sides of streams and rivers, and the mean high water line of tidal waters. 7. Impervious area on the permitted plans that is outside of the drainage area line is not subject to State Stormwater because it was existing development in place prior to 1988. Page 2 of 7 State Stormwater Management Systems Permit No. SW8 140906 8. The following design criteria have been permitted for the infiltration basin and must be provided and maintained at design condition: a. Drainage Area, acres: Onsite, ft2: Offsite, ft2: b. Total Impervious Surfaces, ft2: Onsite, ft2: Offsite, ft2: C. Design Storm, inches: d. Basin Depth, feet: e. Bottom Elevation, FMSL: f. Bottom Surface Area, ft2: g. Max Stage Elevation of 10yr24hr storm, ft: h. Permitted Storage Volume (1.5inch), ft3: ik. Type of Soil: j. Expected Infiltration Rate, in/hr: k. Seasonal High Water Table, FMSL: I. Time to Draw Down, days: M. Receiving Stream/River Basin: n. Stream Index Number: o. Classification of Water Body: II. SCHEDULE OF COMPLIANCE 5.37 233,947 0 148,565 148,565 0 1.5 0.5 7.5 17,794 10.77 18,232 sand 1.20 5.5 0.43 UT to Smith Creek / Cape Fear 18-74-63 "C; SW" 1. The stormwater management system shall be constructed in its entirety, vegetated and operational for its intended use prior to the construction of any built -upon surface. 2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. If the stormwater system is used as an Erosion Control device, it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility. 3. The permittee shall follow the approved Operation and Maintenance Agreement in its entirety, and shall provide and perform the listed operation and maintenance procedures at the specified intervals to assure the permitted stormwater system functions at optimum efficiency. 4. Records of maintenance activities must be kept for each permitted BMP. The reports will indicate the date, activity, name of person performing the work and what actions were taken. 5. The facilities shall be constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 6. All stormwater collection and treatment systems must be located in public rights -of -way, common areas or easements. The final plats for the project will be recorded showing all such required rights -of -way, common areas and easements, in accordance with the approved plans. Access to the stormwater facilities shall be maintained via appropriate easements at all times. 7. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Any deviations from the approved plans and specifications must be noted on the Certification. A modification may be required for those deviations. Page 3 of 7 State Stormwater Management Systems Permit No. SW8 140906 8. The permittee shall submit to the Director and shall have received approval for revised plans, specifications, and calculations prior to construction, for any modification to the approved plans, including, but not limited to, those listed below: a. Any revision to any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Redesign or addition to the approved amount of built -upon area or to the drainage area. G. Further development, subdivision, acquisition, lease or sale of any, all or part of the project area. d. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. e. The construction of any designated future BUA on the application. 9. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made. III. GENERAL CONDITIONS 1. This permit is not transferable to any person or entity except after notice to and approval by the Director. The permittee shall submit a completed and signed Name/Ownership Change Form, accompanied by the supporting documentation as listed on the form, to the Division at least 60 days prior to any one or more of the following events: a. An ownership change including the sale or conveyance of the project area in whole or in part; b. The sale or conveyance of the common areas to a Homeowners or Property Owner's Association, subject to the requirements of Session Law 2011-256; c. Bankruptcy; d. Foreclosure; e. Dissolution of the partnership or corporate entity; f. A name change of the current permittee; g. A name change of the project; h. A mailing address change of the permittee; 2. The permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer request. 3. Approved plans, calculations, supplement forms, operation and maintenance agreements and specifications for this project are incorporated by reference and are enforceable parts of the permit. A copy of the approved plans and specifications shall be maintained on file by the Permittee at all times. 4. Any individual or entity found to be in noncompliance with the terms and conditions of this permit or with the stormwater rules, is subject to enforcement action by the Division, in accordance with NCGS 143, Article 21. 5. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances, which may be imposed by other government agencies (local, state, and federal) having jurisdiction. 6. In the event that the facilities fail to perform satisfactorily the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. 7. The permittee grants DENR Staff permission to enter the property during normal business hours for the purpose of inspecting all components of the permitted stormwater management facility. 8. The permit issued shall continue in force and effect until revoked or terminated. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and reissuance or termination does not stay any permit condition. 9. Unless specified elsewhere, permanent seeding requirements for the stormwater controls must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. Page 4 of 7 State Stormwater Management Systems Permit No. SW8 140906 10. The issuance of this permit does not prohibit the Director from reopening and modifying the permit, revoking and reissuing the permit, or terminating the permit as allowed by the laws, rules and regulations contained in Session Law 2008-211, Title 15A NCAC 2H.1000, and NCGS 143-215.1 et. al. 11. The permittee shall submit a permit renewal application at least 180 days prior to the expiration date of this permit. The renewal request must include the appropriate documentation and the processing fee. Permit issued this the 14% day of October 2014. NORTH I CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION ✓1r�cy Daviso.E., Director Division of Energy, Mineral and Land Resources By Authority of the Environmental Management Commission Page 5 of 7 Permit Number: (to be provided by DI-VQ) I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name: Wilmington Rediness Center Renovation North Carolina National Guard BMP drainage area number: Print name:Rodna Newton - Title:Lieutenant Colonel CFMO, NC National Guard Address:1636 Gold Star Drive Raleigh NC 27607 Phone:91 Signature: . lei - J ' Dater JLC V 1 Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. allotary Public for the State of ���.,f� `;• , County ofdo hereby certify that t - . ;. '1\2PCL_AC N personally appeared before me this day of = ,and acknowledge the due execution of the forgoing infiltration basin maintenance requirements. Witness my hand and official seal, SEAL My commission expires AM(>� '>> Form SW401-Infiltration Basin O&M-Rev.3 Page 3 Of 3 09/26/2014 Wilmington National Guard 13031 MLV Infiltration Pond Calculations Infiltration Pond Size: Elevation (ft.) SurfaceArea (sq. ft.) Incr. Vol (cf) Cuml. Vol. (ct) Bottom 750 17.794 0 0 8.50 18.670 18,232 18,232 9.00 20,482 9,788 28,020 10.00 22,374 21,428 49,448 11.00 24.347 23,361 72,809 12.00 26,400 25,374 98,182 Top of Bank 13.00 28,534 27,467 125,649 *SHGWT 5.50 Infiltration Rate: 1.2 in/hr Required Vol.* = 18,172 cu. ft. *See 1.5" Storage Volume Calculations Effective Infiltration Area: A= V 12*(K*T) where: A = effective infiltrating area (sq.ft.) V = volume of water requiring infiltra8on (cu.ft.) K= hydraulic conductivity of soil (in/hr) T = dewatering time (days) A= 1,683 sf (T=4.5 days) A= the larger of either the bottom surface area or one-half the total (welted) wall area so, use bottom suface area Drawdown Calculation T= V / 2xKxA where: T = dewatering time (days) V = volume of water requiring infiltration (cu.ft.) K = hydraulic conductivity of soil (inlhr) A= effective infiltrating area (sa.ft.) T= 18,172 / 2 x 1.2 x 17,794 T= 0.43 days ECEIVED JUL 2 o amr BY- 13031 Infiltration Pond Volume CalcAs 1 of 1 11/29/2016 Wilmington National Guard 13031 MLV Stormwaler Infiltration Basin Routing 10-year 24hr Storm Half infiltration rate WATERSHED DATA BEFORE DEVELOPMENT WATERSHED AREA 1.57 ACRES RUNOFFCOEF.'C' 0.15 TIME OF CONCENTR 10.00 MIN INTENSITY f10 YR) 6.43 IN/HR Qa = 1.51 CFS Qa = PRE -DEVELOPED PEAK DISCHARGE COMPUTE DEPTH OF RUNOFF P = 7 INCHES 10yr, 24hr PRECIPITATION CN = 76 S = (11000/CN)-10 S = 3.16 Depth (D) = (P-0.2S)`2/(P+D.BS) D = 4.26 IN - 10yr, 24hr RUNOFF DEPTH SET VOLUME AND COMPUTE TIME TO PEAK Tp = [(43.5)(D)(Area)] / Qp Tp = 38.81 MINUTES Storage Volume Req'd = (Qp-Qa)*Tp*1.39*60 78,039 cu. ft. CALCULATE Ks AND b BOTTOM INFILTRATION ELEVATION AT: 7.50 feet AFTER DEVELOPMENT WATERSHED AREA 5.37 ACRES RUNOFF COEF.'C' 0.66 TIME OF CONCENTR 5.00 MIN INTENSITY 10 YR 7.23 IN/HR QP = Qp = POST -DEVELOPED PEAK 25.62 CFS DISCHARGE S Z CONTOUR INCR ACCUM CONTOUR AREA VOL VOL STAGE In S In Z Z est (sq ft) (CU ft) (cu ft) (ft) (ft) 7.50 17794 0 0 0 0 0 0 8.00 18670 18,232 18,232 0.5 9.B109-0.69314718 0.55 9.00 20482 19,576 37,80E 1.5 10.5403 0.4055 1.33 10.00' 22374 21,428 59,236 2.5 10.9893 0.9163 2.27 11.00 24347 23,361 82,597 3.5 11.3217 1.2528 3.39 12.00 26400 25,374 107,970 4.5 11.5896 1.5041 4.68 13.00 28534 27,467 135,437 5.5 11.8163 1.7047 6.14 Regression Output: Ks = 29874 b = 0.83 X Coefficient 10.30 G:IJO M013\13031-Wilmington National GwnhCaka113031 Infiltration Routing 10y24hr_haff inril 11/29/2016 Wilmington National Guard MLV Stonnwater Infiltration Basin Routing 10-year 24hr Storm Half infiltra0on rate CHAINSAW METHOD FOR RISER BARREL ROUTING STORM DATA EC�a�,�D JUL 2 0 201 13031 Qa = 1.51 CIS Qp = 25.62 cis Infiltration rate 0.6 in/hr *Half of Infiltration Rate shown to prove that Tp = 38.8 min (Per Soils Report) system can infiltrate without discharge to waive dT - 4 min the NCDENR olfline bypass & vegetated fitter BASIN DATA Basin Drawdown Time = 3.03 days strip requirements Ks = 29874 b = 0.83 Zo = 7.50 ft Normal water elev = 7.50 It Peak Outflow Weir Length = ft Peak Stage = 10.77 ft Cw= 3.0 Maximum Storage - 80,058 cu ft Zcr= It Control Holes: State Orifice: Dia = 0.00 in Dd= in Inv= 0.00 It Cd = 0.6 Weir: - = 120 in Zi= It Inv= 11.5It Emergency Spillway 120 In Inv= 12.00 ft Emergency Time Inflow Storage Stage Outflow W Riser Barrel Spillway Orifice Weir IFStore Infiltrate (min) (Cfs) (cu ft) (ft) (Cft) (ems) (CIS) (cfs) (cfs) (cfs) ft) (cl) 0 0.0 0 7.50 0 0 0 0.00 0 0.00 0.0 0.0 4 0.7 0 7.50 0 0.00 0 0.00 0 0.00 0.0 59.3 8 2.6 160 7.50 0.00 0.00 0.0 0.00 0.00 0.00 41.2 118.6 12 5.6 782 7.51 0.00 0.00 0.0 0.00 0.00 0.00 604.4 177.9 16 9.3 2122 7.54 0.00 0.00 0.0 0.00 0.00 0.00 1885.2 237.3 20 13.4 4361 7.59 0.00 0.00 0.0 0.00 0.00 0.00 4064.0 296.6 24 17.5 7584 7.68 0.00 0.00 0.0 0.00 0.00 0.00 7227.7 355.9 28 21.0 11776 7.81 0.00 0.00 0.0 0.00 0.00 0.00 11360.8 415.2 32 23.7 16822 7.98 0.00 0.00 0.0 0.00 0.00 0.00 16347.3 474.5 36 25.3 22516 8.19 0.00 0.00 0.0 0.00 0.00 0.00 21982A 533.8 40 25.6 28587 8.42 0.00 0.00 0.0 D.00 0.00 0.00 27993.8 593.1 44 24.5 34723 8.67 0.00 0.00 0.0 0.00 0.00 0.00 34070.1 652.4 48 22.2 40605 8.92 0.00 0.00 0.0 0.00 0.00 0.00 39893.3 711.8 52 19.5 45943 9.14 0.00 0.00 0.0 0.00 0.00 0.00 45171.6 771.1 56 17.0 SD619 9.35 0.00 0.00 0.0 0.00 0.00 0.00 49788.6 830.4 60 14.9 54709 9.53 0.00 0.00 0.0 0.00 0.00 0.00 53819.1 889.7 64 13.0 58286 9.69 0.00 0.00 0.0 0.00 0.00 0.00 57336.8 949.0 68 11.4 61414 9.83 n nn 0.00 0.0 0.00 0.00 0.00 60406.0 1008.3 72 10.0 64150 9.95 0.00 0.00 0.0 0.00 0.00 0.00 63082.8 1067.6 76 8.7 66543 10.06 0.00 0.00 0.0 0.00 0.00 0.00 65416.5 1127.0 80 7.6 68636 10.16 0.00 0.00 0.0 0.00 0.00 0.00 67450.2 1186.3 84 6.7 70467 10.24 0.00 0.00 0.0 0.00 0.00 0.00 69221A 1245.6 88 5.8 72068 10.32 0.00 0.00 0.0 0.00 0.00 0.00 70763.1 1304.9 92 5.1 73468 10.38 0.00 0.00 0.0 0.00 0.00 0.00 72104.0 1364.2 96 4.5 74693 10.44 0.00 0.00 0.0 0.00 0.00 0.00 73269.3 1423.5 100 3.9 75764 10.49 0.00 0.00 0.0 0.00 0.00 0.00 74281.1 1482.8 104 3.4 76701 10.53 0.00 0.00 0.0 0.00 0.00 0.00 75158.5 1542.1 108 3.0 77520 10.56 0.00 0.00 0.0 0.00 0.00 0.00 75918.5 1601.5 112 2.6 78237 10.60 0.00 0.00 0.0 0.00 0.00 0.00 76575.7 1660.8 116 2.3 78863 10.62 0.00 0.00 0.0 0.00 0.00 0.00 77143.1 1720.1 120 2.0 79411 10.65 0.00 0.00 0.0 0.00 0.00 0.00 77631.9 1779.4 124 1.7 79891 10.67 0.00 0.00 0.0 0.00 0.00 0.00 78052.0 1838.7 128 1.5 80310 10.69 0.00 0.00 0.0 0.00 0.00 0.00 78411.9 1898.0 132 1.3 80677 10.7D 0.00 0.00 0.0 0.00 0.00 0.00 78719.3 1957.3 136 1.2 80997 10.71 0.00 0.00 0.0 0.00 0.00 0.00 78980.7 2016.7 140 1.0 81278 10.72 0.00 0.00 0.0 0.00 0.00 0.00 79201.9 2076.0 144 0.9 81523 10.73 0.00 0.00 0.0 0.00 0.00 0.00 79387.9 2135.3 148 0.8 81738 10.74 0.00 0.00 0.0 0.00 0.00 0.00 79543.2 2194.6 152 0.7 81925 10.75 0.00 0.00 0.0 0.00 0.00 0.00 79671.5 2253.9 156 0.6 82090 10.75 0.00 0.00 0.0 0.00 0.00 0.00 79776.3 2313.2 160 0.5 82233 10.76 0.00 0.00 0.0 0.00 0.00 0.00 79860.5 2372.5 164 0.5 82359 10.76 0.00 0.00 0.0 0.00 0.00 0.00 79926.8 2431.8 168 0.4 82468 10.76 0.00 0.00 0.0 0.00 0.00 0.00 79977.3 2491.2 172 0.3 82564 10.76 0.00 D.00 0.0 0.00 0.00 0.00 80014.0 2550.5 176 0.3 82648 10.76 0.00 0.00 0.0 0.00 0.00 0.00 80036.7 2609.8 180 0.3 82722 10.77 0.00 0.00 0.0 0.00 0.00 0.00 80052.8 2669.1 184 0.2 82786 10.77 0.00 0.00 0.0 0.00 0.00 0.00 80057.7 2728.4 GAIOBB120131130314Wmiugton National GuardlCaks113031 Infiltration Routing 10y24hr_half in il.ds 11/2912010 Wilmington National Guard 13031 MLV Slormwater Infiltration Basin Routing 10-year 24hr Storm Half infiltration rate 18B 0.2 82842 10.77 0.00 0.00 0.0 0.00 0.00 0.00 80054.6 2787.7 G:WOBSTOM13031-Wilmington Nefionel GuardlCal=113031 Infiltration Routing 10yrUhr half iMl.xls 11/29/2016 Wilmington National Guard 13031 MLV Stormwater Infiltration Basin Routing 10-year 24hr Storm Half infiltration rate 192 0.2 82891 10.77 0.00 0.00 0.0 0.00 0.00 0.00 80044A 2847.0 196 0.2 82934 10.76 0.00 0.00 0.0 D.DD 0.00 0.00 80028.1 2906.4 200 0.1 82972 10.76 0.00 0.00 0.0 0.00 0.00 0.00 80006A 2965.7 204 0.1 83005 10.76 0.00 0.00 0.0 0.00 0.00 0.00 79979.9 3025.0 208 0.1 83034 10.76 0.00 0.00 0.0 0.00 0.00 0.00 79949.4 3084.3 212 0.1 83059 10.76 0.00 0.00 0.0 0.00 0.00 0.00 799152 3143.6 216 0.1 83081 10.76 0.00 0.00 0.0 0.00 0.00 0.00 79877.9 3202.9 220 0.1 83100 10.76 0.00 0.00 0.0 0.00 0.00 0.00 79837.8 3262.2 224 0.1 83117 10.75 0.00 0.00 0.0 O.OD 0.00 O.DO 79795.3 3321.5 228 0.1 83132 10.75 0.00 0.00 0.0 0.00 0.00 0.00 79750.7 3380.9 232 0.0 83144 10.75 0.00 0.00 0.0 0.00 0.00 0.00 79704.3 3440.2 236 0.0 83156 10.75 0.00 0.00 0.0 0.00 0.00 0.00 79658.2 3499.5 240 0.0 83165 10.74 0.00 0.00 0.0 0.00 0.00 0.00 79606.8 3558.8 244 0.0 83174 10.74 0.00 0.00 0.0 0.00 0.00 0.00 79556.1 3618.1 248 0.0 83182 10.74 0.00 0.00 0.0 0.00 0.00 D.00 79504.3 3677.4 252 0.0 8318B 10.74 0.00 0.00 0.0 0.00 0.00 0.00 79451.6 3736.7 256 0.0 83194 10.73 0.00 0.00 0.0 0.00 0.00 0.00 79398.0 3796.1 260 0.0 83199 10.73 0.00 0.00 0.0 0.00 0.00 0.00 79343.7 3855.4 264 0.0 83204 10.73 0.00 0.00 0.0 0.00 0.00 0.00 79288.8 3914.7 268 0.0 83207 10.73 0.00 0.00 0.0 0.00 0.00 0.00 79233A 3974.0 272 0.0 83211 10.72 0.00 D.00 0.0 0.00 0.00 0.00 79177A 4033.3 276 0.0 83214 10.72 0.00 0.00 0.0 0.00 0.00 0.00 79121.1 4092.6 280 0.0 83216 10.72 0.00 0.00 0.0 0.00 0.00 0.00 79064.3 4151.9 284 0.0 83219 10.71 0.00 0.00 0.0 0.00 0.00 0.00 79007.3 4211.2 288 0.0 83220 10.71 0.00 0.00 0.0 0.00 0.00 0.00 78949.9 4270.6 292 0.0 83222 10.71 0.00 0.00 0.0 0.00 0.00 0.00 78892.3 4329.9 296 0.0 83224 10.71 0.00 0.00 0.0 0.00 0.00 0.00 78834.5 4389.2 300 0.0 83225 10.70 0.00 0.00 0.0 0.00 0.00 0.00 78776.5 4448.5 304 0.0 83226 10.70 0.00 0.00 0.0 0.00 0.00 0.00 78718.4 4507.8 308 0.0 83227 10.70 0.00 0.00 0.0 0.00 0.00 0.00 78660.1 4567.1 312 0.0 83228 10.69 0.00 0.00 0.0 0.00 0.00 0.00 78601.6 4626.4 316 0.0 83229 10.69 0.00 0.00 0.0 0.00 0.00 0.00 78543.1 4685.8 320 0.0 83230 10.69 0.00 0.00 0.0 0.00 0.00 0.00 78484.5 4745.1 324 0.0 83230 10.69 0.00 0.00 0.0 0.00 0.00 0.00 78425.7 4804.4 328 0.0 83231 10.68 0.00 0.00 0.0 0.00 0.00 0.00 78366.9 4863.7 332 0.0 83231 10.68 0.00 0.00 0.0 0.00 0.00 0.00 78308.1 4923.0 336 0.0 83231 10.68 0.00 0.00 0.0 0.00 0.00 0.00 78249.2 4982.3 340 0.0 83232 10.67 0.00 0.00 0.0 0.00 0.00 0.00 78190.2 5041.6 344 0.0 83232 10.67 0.00 0.00 0.0 0.00 0.00 0.00 78131.2 5100.9 348 0.0 83232 10.67 0.00 0.00 0.0 0.00 0.00 0.00 78072.1 5160.3 352 0.0 83233 10.67 0.00 0.00 0.0 0.00 0.00 0.00 78013.1 5219.6 356 0.0 83233 10.66 0.00 0.00 0.0 0.00 0.00 0.00 77953.9 5278.9 360 0.0 83233 10.66 0.00 0.00 0.0 0.00 0.00 0.00 77894.8 5338.2 364 0.0 83233 10.66 0.00 0.00 0.0 0.00 0.00 0.00 77835.6 5397.5 368 0.0 83233 10.65 0.00 0.00 0.0 0.00 0.00 0.00 77775.5 5456.8 372 0.0 83233 10.65 0.00 0.00 0.0 0.00 0.00 0.00 77717.3 5516.1 376 0.0 83234 10.65 0.00 0.00 0.0 0.00 0.00 0.00 77658.1 5575.5 380 0.0 83234 10.65 0.00 0.00 0.0 0.00 0.00 0.00 77598.8 5634.8 384 0.0 83234 10.84 0.00 0.00 0.0 0.00 0.00 0.00 77539.6 5694.1 388 0.0 83234 10.84 0.00 0.00 0.0 0.00 0.00 0.00 77480.4 5753.4 392 0.0 83234 10.64 0.00 0.00 0.0 0.00 0.00 0.00 77421.1 5812.7 396 0.0 B3234 10.63 0.00 0.00 0.0 0.00 0.00 0.00 77361.8 5B72.0 400 0.0 83234 10.63 0.00 0.00 0.0 0.00 0.00 0.00 77302.6 5931.3 404 0.0 83234 10.63 0.00 0.00 0.0 0.00 0.00 0.00 77243.3 5990.6 408 0.0 83234 10.63 0.00 0.00 0.0 0.00 0.00 0.00 77184.0 6050.0 cEIVE OL 10 2017 BY- G.UOB512013113031-VWmin&n National GuwcftCaW13031 Infiltration Routing 10y24hr_half inrilAs 12/15/2016 Wilmington National Guard 14004 MLV Pre Developed Time of Concentration Kirpich Method Grassed surface overland flow L = 500 feet Tc = ((L 3 / H) 5) / 128)*2 H = 13 feet Tc = 7.63 min. use 10 min. 12/15/2016 Wilmington National Guard 13031 MLV Post Developed Time of Concentration Kiraich Method Concrete surface overland flow L = 160 feet H = 1.2 feet Tc = ((L 3 / H)0.3115) / 128*0.4 Tc = 1.02 min. Concrete channel flow L = 667 feet H = 3.8 feet Tc = ((L 3 / H)0.385) / 128*0.2 Tc = 1.71 min. Tc = Concrete surface overland flow + Grassed surface overland flow + Grass channel flow + Concrete channel flow Tc = 2.73 min. use 5 min. "FIECEIV �UL 2 0 20V 10/01/2014 Wilmington National Guard 13031 MVL Simple Method -1.5" Storage Volume Calculations Storage Volume - Non SA Waters - Minimum Volume Required Volume of Runoff = V = (3630) (Design Rainfall Depth) (RV) (Drainage Area) where Rv= 0.05+0.009(IA) Rv = Runoff Coefficient = storm runoff (inches) / storm rainfall (inches) IA = Impervious Fraction = Impervious portion of the drainage area (acres) / Drainage area (acres) IA= 63.5 % Rv = 0.62 Design Rainfall Depth = 1.50 in. Drainage Area 5.37 acres Volume Required = 18,172 fts Volume Provided = 18,232 f? GNO&A2013\13031-Wilmington National Guard\Cala\13031-Storage Volume Calls 1.51nch.alm 10/01/2014MLV Wilmington National GuardCN and C Values 13031 PRE DEVELOPMENT Determine Composite CN Value from TR-55 Table 2-2 "Soil Type: Sand Description HSG CN A (ac) CN x A Impervious (on -site) - 98 0.00 0.00 Wooded A 45 1.57 70.65 1.57 70.65 Composite CN Value = 45 Pre Development Composite Runoff Coefficient Description C A (ac) C x A Impervious 0.95 0.00 0 Wooded 0.15 1.57 0.2355 1.57 0.2355 Composite C Value = 0.15 POST DEVELOPMENT Determine Composite CN Value from TR-55 Table 2-2 "Soil Type: Sand Description HSG CN A (ac) CN x A Impervious 98 3.41 334.18 Open Space (Fair) A 39 1.96 76.44 5.37 410.62 Composite CN Value = 76 Post Development Composite Runoff Coefficient Description C A (ac) C x A Impervious 0.95 3.41 3.2395 Lawns, sandy soil, flat 0.15 1.96 0.294 5.37 3.5335 Composite C Value = 0.66 G:IJOBS12013\13031-Wilmington National GuardkCalcs\CN & C Value Calcs Total Draina a Area ft. acres 233,947 5.37 Post Development Im ervious Area Land Use s . ft. acres Proposed Impervious 48,210 1.11 EAsting Impervious 40,405 0.93 Future Impervious 59,950 1.38 Total 148,565 3.41 % impervious = 0.635 = 63.5% EcEIVE JUL 2 0 W DEMLR USE ONLY Date Received Fee Paid Permit Number„ V Applicable Rules: ❑ Coastal SW -1995 ❑ Coastal SW - 2008 ❑ Ph II - Post Construction (select all that apply) ❑ Non -Coastal SW- HQW/ORW Waters ❑ Universal Stormwater Management Plan ❑ Other WQ M mt Plan: State of North Carolina Department of Environment and Natural Resources Division of Energy, Mineral and Land Resources STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may be photocopied for use as an original I. GENERAL INFORMATION 1. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): Wilmington Readiness Center Renovation North Carolina National Guard 2. Location of Project (street address): 2412 Infap= Road City:Wihnington County:New Hanover Zip:28405 3. Directions to project (from nearest major intersection): From the intersection of US 74 (Martin Luther King Tr. Parkway) and SR 1175 (N. Kerr Ave.), travel north on N. Kerr Ave approx. 0.8 mile Turn left onto Control Tower Road and travel approx. 0.14 mile. Turn left onto Infantry Road and trave approx. 0.2 mile Site is on the left. 4. Latitude:.34° 15' 47" N Longitude:770 53' 35" W of the main entrance to the project. II. PERMIT INFORMATION: 1. a. Specify whether project is (check one): ®New ❑Modification ❑ Renewal w/ Modificationt tRenewals with modifications also requires SWLi-102 - Renewal Application Form b.If this application is being submitted as the result of a modification to an existing permit, list the existing permit number , its issue date (if known) , and the status of construction: ❑Not Started ❑Partially Completed* ❑ Completed* *provide a designer's certification 2. Specify the type of project (check one): ❑Low Density ®High Density ❑Drains to an Offsite Stormwater System []Other 3. If this application is -being submitted as the result of a previously returned application or a letter from DEMLR requesting a state stormwater management permit application, list the 6tormwater project number, if assigned, and the previous name of the project, if different than cufrently proposed, 4. a. Additional Project Requirements (check applicable blanks; information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748): ❑LAMA Major ❑NPDES Industrial Stormwater ®Sedimentation/Erosion Control:12 ac of Disturbed Area 0404/401 Permit: Proposed Impacts b.If any of these permits have already been acquired please provide the Project Name, Project/Permit Number, issue date and the type of each permit: 5. Is the project located within 5 miles of a public airport? ❑No ®Yes If yes, see S.L. 2012-200, Part VI: http://12ortal.ncdenr.org/web/Ir/rules-and-regulations Form SWU-101 Version Oct. 31, 2013 Page 1 of 6 III. CONTACT INFORMATION 1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee, designated government official, individual, etc. who owns the protect): Applicant/Organization:State of North Carolina through the NC Dent of Public Safety. NC National Guard Signing Official & Title:LTC Rodney Newton b. Contact information for person listed in item 1a above: Street Address:1636 Gold Star Drive City:Ralgigh State:NC Zip:27607 Mailing Address (if applicable): City: State: Zip: Phone: (919 ) 664-6062 Fax: ( ) Email:Rex.w.williams.nfg@mail.mil c. Please check the appropriate box. The applicant listed above is: Z The property owner (Skip to Contact Information, item 3a) ❑ Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below) ❑ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and 2b below) ❑ Developer* (Complete Contact Information, item 2a and 2b below.) 2. a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. (Phis is the person who owns the property that the project is located on): Property Owner/Organization: Signing Official & Title: b. Contact information for person listed in item 2a above: Street Address: City: State: Zip: Mailing Address (if applicable): City:, State: Zip: Phone: ( ) Fax: Email: 3. a. (Optional) Print the name and title of another contact such as the project's construction supervisor or other person who can answer questions about the project: Other Contact Person/Organization:Construction and Facility Management Office, NC National Guard Signing Official & Title:Rex W. Williams, Senior Project Manager b. Contact information for person listed in item 3a above: Mailing Address:1636 Gold Star Drive, Suite 2600 City:Ralei h State:NC Zip:27607 Phone: (919 ) 664-6062 Email:Rex.w.williams.nWmail.mil 4. Local jurisdiction for building permits: Point of Contact: Fax: ( ) BY: Form SWU-101 Version Oct. 31, 2013 Page 2 of 6 IV. PROJECT INFORMATION I. In the space provided below, briefly summarize how the stormwater runoff will be treated. Sheet flow into drop and curb inlets to a proposed infiltration basil 2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved: ❑ Approval of a Site Specific Development Plan or PUD Approval Date: ❑ Valid Building Permit Issued Date: ❑ Other: Date: b. If claiming vested rights, identify the regulation(s) the project has been designed in accordance with: ❑ Coastal SW -1995 ❑ Ph II - Post Construction 3. Stormwater runoff from this project drains to the Cape Fear River basin. 4. Total Property Area: 41.29 acres 5. Total Coastal Wetlands Area: 0 acres 6. Total Surface Water Area: 0 acres 7. Total Property Area (4) - Total Coastal Wetlands Area (5) - Total Surface Water Area (6) = Total Project Area+:41.29 acres + Total project area shall be calculated to exclude the following: the normal pool of impounded structures, the area between the batiks of streams and rivers, the area below the Normal High Water (NHV\o line or Mean High Water (MHVV) line, and coastal wetlands landward from the NHW (or MHW) Iine. The resultant project area is used to calculate overall percent built upon area (BUA). Non -coastal wetlands Iandward of the NHW (orMHA9 line may be included in the total project area. 8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 =18.28 % 9. How many drainage areas does the project have?1 (For high density, count 1 for each proposed engineered storntwater BMP. For low density and other projects, use 1 for the whole property area) 10. Complete the following information for each drainage area identified in Project Information item 9. If there are more than four drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as below. Basin Information Drainage Area 1 Drainage Area _ Drainage Area _ Drainage Area _ Receiving Stream Name UT to Smith Creek Stream Class C;Sw Stream Index Number * 18-74-63 Total Drainage Area (so 233,947 On -site Drainage Area (so 233,947 Off -site Drainage Area (so - Proposed Impervious Area** (so 148,565 % impervious Area**(total) 63.5 Impervious" Surface Area Drainage Area 1 Drainage Area _ Drainage Area _ Drainage Area _ On -site Buildings/Lots (so - On -site Streets (sf) - On -site Parking (so 48,210 On -site Sidewalks (sf) - Other on -site (sf) - Future (so 59,950 Off -site (sf) - Existing-BUA*** (so 40,405 Total (sf): 148,565 * Stream Class and Index Number can be determined at: http //portal nctienr.orq/weh/ziW/ s/csu/ctasstpcattons Impervious area is defined as the built upon area including, but not limited to, buildings, roads; parking areas, sidewalks, gravel areas, etc. Form SWU-101 Version Oct. 31, 2013 Page 3 of 6 ' *Report only that amount of existing BUA that will remain afte-e development. Do not report any existing BUA that is to be removed and which will be replaced by new B UA. 11. How was the off -site impervious area listed above determined? Provide documentation. NA Proieets in Union County: Contact DEMLR Central Offlice staff to check if the project is located within a Threatened & Endangered Species watershed that may be subject to more stringent stormwater requirements as per 15,f NCAC 02B .0600. V. SUPPLEMENT AND O&M FORMS The applicable state stormwater management permit supplement and operation and maintenance (O&M) forms must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded fromhgp://portaLncdenr.org/web/­wq/ws/su/bmg-manual. VI. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Energy, Mineral and Land Resources (DEMLR). A complete package includes all of the items listed below. A detailed application instruction sheet and BMP checklists are available from htq2:1 /portal.ncdenr.org/ web/wq /ws /su/statesw/ forms does. The complete application package should be submitted to the appropriate DEMLR Office. (The appropriate office may be found by locating project on the interactive onlinemap athM://portal.ncdenr.org/web/n/ws/su/maps.) Please indicate that the following required information have been provided by initialing in the space provided for each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions for each submitted application package from ht!p://portal.ncdenr.org/web/wq/ws/su/statesw/forms dots. Initials 1. Original and one copy of the Stormwater Management Permit Application Form. 2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants V r Form. (if required as per Part VH below) 3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M agreement(s) for each BMP: 4. Permit application processing fee of $505 payable to NCDENR. (For an Express revieiv, refer to io - i http://www.envheIR.org/pages/onestol2exRress.html for information on the Express program and the associated fees. Contact the appropriate regional office Express Permit Coordinator for additional information and to schedule the required application meeting.) 5. A detailed narrative (one to two pages) describing the stormwater treatment/managementfor the project. This is required in addition to the brief summary provided in the Project Information, item 1. 6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the receiving stream drains to class SA waters within 1h mile of the site boundary, include the 1h mile radius on the map. 7. Sealed, signed and dated calculations (one copy). 8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including: a. Development/Project name. b. Engineer and firm. c. Location map with named streets and NCSR numbers. d. Legend. e. North arrow. f. Scale. g. Revision number and dates. h. Identify all surface waters on the plans by delineating the normal pool elevation of impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal waters, and any coastal wetlands landward of the MHW or NHW Iines. o Delineate the vegetated buffer landward from the normal pool elevation of impounded structures, the banks of streams or rivers, and the MHW (or NHW) of tidal waters. i Dimensioned property/project boundary with bearings & distances. j. Site Layout with all BUA identified and dimensioned. k. Existing contours, proposed contours, spot elevations, finished floor elevations. L Details of roads, drainage features, collection systems, and stormwater control measures. m. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a qualified person. Provide documentation of qualifications and identify the person who made the determination on the plans. Form SWU-101 Version Oct. 31, 2013 Page 4 of 6 n. Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations. o. Drainage areas delineated (included in the main set of plans, not as a separate document). p. Vegetated buffers (where required). 9. Copy of any applicable soils report with the associated SHWT elevations (Please identify t: ,'; J' elevations in addition to depths) as well as a map of the boring locations with the existing elevations and boring logs. Include an 8.5"x11" copy of the NRCS County Soils map with the project area clearly delineated. For projects with infiltration BMPs, the report should also include the soil type, expected infiltration rate, and the method of determining the infiltration rate. (Infiltration Devices submitted to WiRO: Schedule a site visit for DEMLR to verify the SHWl' prior to submittal, (910) 796-7378.) 10. A copy of the most current property deed. Deed book:1121 Page No: 0020 11. For corporations and limited liability corporations (LLC): Provide documentation from the NC Secretary of State or other official documentation, which supports the titles and positions held by the persons listed in Contact Information, item 1a, 2a, and/or 3a per 15A NCAC 2H.1003(e). The corporation or LLC must be listed as an active corporation in good standing with the NC Secretary of State, otherwise the application will be returned. h!tp://www.secrgjLr ,ystate.nc.us/Corporations/CSearch.aspx VII. DEED RESTRICTIONS AND PROTECTIVE COVENANTS For all subdivisions, outparcels, and future development, the appropriate property restrictions and protective covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed BUA allocations vary, a table listing each lot number, lot size, and the allowable built -upon area must be provided as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and protective covenants forms can be downloaded from http•//portal ncdenr ore/web/Ir/state-stormwater- forms does. Download the latest versions for each submittal. In the instances where the applicant is different than the property owner, it is the responsibility of the property owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring that the deed restrictions are recorded. By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and protective covenants for this project, if required, shall include all the items required in the permit and listed on the forms available on the website, that the covenants will be binding on all parties and persons claiming under them, that they will run with the Iand, that the required covenants cannot be changed or deleted without concurrence from the NC DEMLR, and that they will be recorded prior to the sale of any lot. VIII. CONSULTANT INFORMATION AND AUTHORIZATION Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as a consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as addressing requests for additional information). Consulting Engineer:Philh_p G. Tripp, P.E. Consulting Firm: Tripp Engineering -- Mailing Address:419 Chestnut Street City:Wilmington Phone: (910 ) 763-5100 Email:trippeng@ec rr com State:NC Zip:28401 Fax: (910 763-5631 IX. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out, complete this section) I, (print or hjpe name of person listed in Contact Information, item 2a) , certify that I own the property identified in this permit application, and thus give permission to (print or hjpe name of person Iisted in Contact Information, item 1a) with (print or type name of organization listed in Contact Information, item la) to develop the project as currently proposed. A copy of the lease agreement or pending property sales contract has been provided with the submittal, which indicates the party responsible for the operation and maintenance of the stormwater system. Form SWU-101 Version Oct. 31, 2013 Page 5 of 6 As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated agent (entity Iisted in Contact Information, item 1) dissolves their company and/or cancels or defaults on their Iease agreement, or pending sale, responsibility for compliance with the DEMLR Stormwater permit reverts back to me, the property owner. As the property owner, it is my responsibility to notify DEMLR immediately and submit a completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater treatment facility without a valid permit. I understand that the operation of a stormwater treatment facility without a valid permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement action including the assessment of civil penalties of up to $25,000 per day, pursuant to NCGS 143-215.6. Signature: Date: a Notary Public for the State of , County of . do hereby certify that personally appeared before me this _ day of and acknowledge the due execution of the application for a stormwater permit. Witness my hand and official seal, SEAL My commission expires X. APPLICANT'S CERTIFICATION I, (print or type name of person Iisted in Contact Information, item 1 a) Rodney Newton certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants will be recorded, and that the proposed project complies with the requirements of the applicable stormwater rules under 15A NCAC 2H .1000 and any other applicable state stormwater requirements. Signature: _ /) . /L ` Date: I, �� t.`f \ a Notary Public for the State of . �' ( 6� X 1t !1[f. , County of Vb.do hereby certify that KYLN uk .L personally appeared before me this day of � .��-� Ui �.1 , and acknowledge the due execution of the application for a stormwater permit. Witness any hand and official seal, �- d'-'- tZ L�^— SEAL My commission expires��1 Form SWU-101 Version Oct. 31, 2013 Page 6 of 6 s Permit No.�)U.J c '4 J y oo (to be provided byDWQ) QF WATF9 ® STORMWATER MANAGEMENT PERMIT APPLICATION FORM WC®ENR 401 CERTIFICATION APPLICATION FORM INFILTRATION BASIN SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part Ill) must be printed, filled out and submitted along with all of the required information. I. PROJECT INFORMATION Project Name Wilmington National Guard Contact Person Phil Tripp Phone Number 910-7635100 Date 10/9/2014 Drainage Area Number 1 II. DESIGN INFORMATION Site Characteristics Drainage area 233,947.00 fe Impervious area 148,565.D0 it' Percent impervious 63.50 % Design rainfall depth 1.50 in Peak Flow Calculations 1-yr, 24-hrrainfall depth 1-yr, 24-hr intensity Pre -development 1-yr, 24-hr discharge Post -development 1-yr, 24-hr discharge Pre/Post 1-yr, 24-hr peak flow control Storage Volume: Non -SA Waters Minimum design volume required Design volume provided Storage Volume: SA Waters 1.5" runoff volume Pre -development 1-yr, 24-hr runoff volume Post -development 1-yr, 24-hr runoff volume Minimum required volume Volume provided Soils Report Summary Soil type Infiltration rate SH WT elevation Basin Design Parameters Drawdown time Basin side slopes Basin bottom elevation Storage elevation Storage Surface Area Top elevation Basin Bottom Dimensions Basin length Basin width Bottom Surface Area 3.76 in 3.90 in/hr 0.92 ft3/sec 13.82 ft3/sec 12.90 ft3/sec 18,172.00 tO 18,232.00 ft3 OK for non -SA waters ft3 ft3 ft3 ft3 ft3 sand 1.20 inlhr 5.50 fmsl 0.43 days OK 3.00 :1 OK 7.50 fmsl OK 8.00 fmsl 18,670.00 fe 13.00 fmsi 175.00 It 130.00 It 17,794.00 fe Form SW401-Infiltration Basin-Rev.5 11Apr2011 Parts I. & II. Design Summary, Page 1 of 2 Permit No. (to be provided by DWQ) Additional Information Maximum runoff to each inlet to the basin? LNU ac-in OK Length of vegetative filter for overflow na t OK Distance to structure 35.00 It OK Distance from surface waters 1,300.00 It OK Distance from water supplyweil(s) 100+ t OK Separation from impervious soli layer 2.OU It OK Naturally occuring soil above shwt 2.00 It OK Bottom covered with 4-in of clean sand? y (Y or N) OK Proposed drainage easement provided? y (Y or N) OK Capures all runoff at ultimate build -out? y (Y or N) OK Bypass provided for larger storms? na (Y or N) OK Pretreatment device provided drop inlet Fonn SW4o1-Infiltration Basin-Rev.5 11Ap2n11 Parts I. & II. design Summary, Page 2 of 2 ` l Permit Number:__ (to be provided by DYVO Drainage Area Number:_._ Infiltration Basin Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. Important maintenance procedures: --- The drainage area will be carefully managed to reduce the sediment load to the infiltration basin. — Immediately after the infiltration basin is established, the vegetation will be watered twice weekly if needed until the plants become established (commonly six weeks). — No portion of the infiltration basin will be fertilized after the initial fertilization that is required to establish the vegetation. --- The vegetation in and around the basin will be maintained at a height of approximately six inches. After the infiltration basin is established, it will be inspected once a quarter and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance will be kept in a known set location and will be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potentialproblem: How I will remediate theproblem: The entire BMP Trash/debris is present. Remove the trash/debris. The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to infiltration basin erosive gullies have formed. remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one-time fertilizer application. The inlet device: pipe or The pipe is clogged (if Unclog the pipe. Dispose of the Swale applicable). sediment off -site. The pipe is cracked or Replace the pipe. otherwise damaged (if applicable). Erosion is occurring in the Regrade the swale if necessary to swale (if applicable). smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. Form SW401-Infiltration Basin O&M-Rev.3 Page 1 of 3 BMP element: The forebay The main treatment area The embankment The outlet device The receiving water Potential problem: Sediment has accumulated and reduced the depth to 75% of the original design depth. Erosion has occurred or riprap is displaced. Weeds are present. A visible layer of sediment has accumulated. Water is standing more than 5 days after a storm event. Weeds and noxious plants are growing in the main treatment area. Shrubs or trees have started to grow on the embankment. An annual inspection by an appropriate professional shows that the embankment needs repair. Clogging has occurred. The outlet device is damaged Erosion or other signs of damage have occurred at the outlet. How I will remediate the problem: Search for the source of the sediment and remedy the problem if possible. Remove the sediment and dispose of it in a location where it will not cause impacts to streams or the BMP. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Remove the weeds, preferably by hand. If pesticides are used, wipe them on the plants rather than Search for the source of the sediment and remedy the problem if possible. Remove the sediment and dispose of it in a location where it will not cause impacts to streams or the BMP. Replace any media that was removed in the process. Revegetate disturbed areas Replace the top few inches of filter media and see if this corrects the standing water problem. If so, revegetate immediately. If not, consult an appropriate professional for a more extensive repair. Remove the plants by hand or by wiping them with pesticide {do not Remove shrubs or trees Make all needed repairs. Clean out the outlet device. Dispose of the sediment off -site. Repair or replace the outlet device. Contact the NC Division of Water Quality 401 Oversight Unit at 919- 733-1786. Form SW401-Infiltration Basin O&M-Rev.3 Page 9. of 3 State Stormwater Management Systems Permit No. SW8 140906 Wilmington Readiness Center Renovation North Carolina National Guard Stormwater Permit No. SW8140906 New Hanover County Designer's Certification I, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/ weekly/ full time) the construction of the project, (Project) for (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is included in the Certification. Noted deviations from approved plans and specification; Signature Registration Number Date SEAL Page 6 of 7 State Stormwater Management Systems Permit No. SW8 140906 Certification Requirements: 1. The drainage area to the system contains approximately the permitted acreage. 2. The drainage area to the system contains no more than the permitted amount of built -upon area. 3. All the built -upon area associated with the project is graded such that the runoff drains to the system. 4. All roof drains are located such that the runoff is directed into the system. 5. The bypass structure weir elevation is per the approved plan. 6. The bypass structure is located per the approved plans. 7. A Trash Rack is provided on the bypass structure. 8. All slopes are grassed with permanent vegetation. 9. Vegetated slopes are no steeper than 3:1. 10. The inlets are located per the approved plans and do not cause short-circuiting of the system. 11. The permitted amounts of surface area and/or volume have been provided. 12. All required design depths are provided. 13. All required parts of the system are provided. 14. 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Call and Email the completed form to the Permit Coordinator along with a completed DETAILED narrative, site plan (PDF file) and vicinity map (same items expected in the application package of the project location. Please include this form in the application package. • Asheville Region Alison Davidson 828 296-4698;alison.davidson®ncdenr C ov • Fayetteville or Raleigh Region -David Lee 919-791-4203; davidleefncdenrgov ■ Mooresville or Winston Salem -Marcia Allocco 704-235-2107; marcia.alloccofncdenr.00v • Washington Region -Lyn Hardison 252-948-3842 or lyn.hardisonfncdenr.gov • Wilmington Region -Cameron Weaver 910-796-7303 or cameron.weaver@ncdenr.00v NOTE Project application received after 12 noon will be stamped in the following work day. Project Name: NATIONAL GUARD READINESS CENTER County: NEW HANOVER Applicant: VICKIE DUDICK Company: NORTH CAROLINA NATIONAL GUARD Address: 1636 GOLD STAR DRIVE City: RALEIGH, State: NC Zip: 27607-_ /off Phone: 984-664-6186, Fax: = Email: vickie.a.dudick@mail.mil 7' Physical Location:2412 INFANTRY ROAD, WILMINGTON NC M related to this Prc;ect SW 140906 St"J SW NPDES NPDES V."Q WQ E&S NEWHA-015-00 E&S Other Project Drains into SMITH CREEK waters — Water classification C, SW (DWR Surface Water Ciasr>ifica!iors Va") Project Located in CAPE FEAR River Basin. Is project draining to class ORW waters? N, within Yz milic and draininc to class SA waters N or within 1 mile and draining to class HQW waters? N JUN 1 4M Engineer/Consultant: JAMIE E. GOLLINGS Company: JACOBS Address:111 CORNING ROAD, SUITE 200 City: CARY, State: NC Zip: 27518 _ Phone: 919-859-5752, Fax: 919-859-5000, Email: lamie.gollings�iacobs.com PLEASE PROVIDE ESTIMATED INVESTMENT AND EXPECTED EMPLOYMENT, IF AVAILABLE � $10000000.00 #181 JOBS SECTION ONE: REQUESTING A SCOPING MEETING ONLY ❑ Scoping Meeting ONLY ❑ DWR, ❑ DCM, ❑ DEMLR, ❑ OTHER: SECTION TWO: CHECK ONLY THE PROGRAM (Sl YOU ARE REQUESTING FOR EXPRESS PERMITTING ❑ 401 Unit ❑ Stream Origin Determination: _ # of stream calls — Please attach TOPO map marking the areas in questions ❑ Intermittent/Perennial Determination: _ # of stream calls — Please attach TOPO map marking the areas in questions ❑ 401 Water Quality Certification ❑ Isolated Wetland (_linear ft or _acres) ❑ Riparian Buffer Authorization ❑ Minor Variance ❑ Major General Variance ® State Stormwater ® General ❑ SFR, ❑ SFR < 1 ac. ❑ Bkhd & Bt Rmp, ❑ Clear & Grub, ❑ Utility ❑ Other ❑ Low Density ❑ Low Density -Curb & Gutter _ # Curb Outlet Swales ❑ Off -site [SW (Provide permit #)] ® High Density -Detention Pond 3 # Treatment Systems ❑ High Density -Infiltration _ #Treatment Systems ❑ High Density -Bio-Retention _ # Treatment Systems ❑ High Density —SW Wetlands _ # Treatment Systems ❑ High Density -Other _ # Treatment Systems/® MOD:❑ Major ElMinor ElPlan Revision ❑ Redev. Exclusion SW 140906 (Provide permit#) ❑ Coastal Management ❑ Excavation & Fill ❑ Bridges & Culverts ❑ Structures Information ❑ Upland Development ❑ Marina Development ❑ Urban Waterfront ® Land Quality ® Erosion and Sedimentation Control Plan with 7_0 acres to be disturbed. (CK # & Amt. (for DEQ use)) SECTION THREE — PLEASE CHECK ALL THAT IS APPLICABLE TO YOUR PROJECT (for both scoping and express meeting request Wetlands on Site ❑ Yes ❑ No Wetlands Delineation has been completed: ❑ Yes ❑ No US ACOE Approval of Delineation completed: ❑ Yes ❑ No Received from US ACOE ❑ Yes ❑ No DEQ ure Fee Split for multiple permits: (Check# Buffer Impacts: ❑ No ❑ YES: _acre(s) Isolated wetland on Property ❑ Yes ❑ No 404 Application in Process w/ US ACOE: ❑ Yes ❑ No Permit Total Fee Amount S SUBMITTAL DATES Fee SUBMITTAL DATES Fee CAMA $ Variance (❑ Maj; ❑ Min) $ SW (❑ HD, ❑ LD, ❑ Gen) $ 401: $ LQS $ Stream Deter,_ $ NCDEQ EXPRESS March 2016 JACOBS Subject Stormwater Narrative Attention Cameron Weaver, NCDEQ From Jamie Gollings Date June 6, 2017 Copies to: 111 Corning Road, Suite 200 Cary, North Carolina 27518 United States T +1.919.859.5000 F +1.919.859.5151 www.jacobs.com Project Name NATIONAL GUARD READINESS CENTER Project No. F6W72100 National Guard - LTC Rodney Newton; MAJ Kent Caldwell; Mr. William Burriola; Mr Brian Ruff; Ms. Vickie Dudick Jacobs — Jim Kurtz; Paul Langenfeld; Tom Wainwright The North Carolina National Guard plans to demolish the existing Readiness Center located at 2412 Infantry Road and construct a new Readiness Center facility in the same location. The project generally includes demolition of the existing building, construction of the new building, site utilities, improvement of the previously permitted military vehicle parking area, and supporting facilities. The project was planned and permitted for Stormwater (SW8 140906) and Land Disturbance (NEWHA- 2015-007) as a renovation to the existing building renovation with the addition of military vehicle parking. The construction scope associated with the Stormwater and Land Disturbance Permits has been executed. From a Stormwater perspective, water quantity and quality compliance was permitted through the implementation of an infiltration basin. The infiltration basin included capacity for the immediately planned impervious cover plus some additional capacity for future impervious cover. From a Land Disturbance perspective, the extent of work from the original permit has been previously executed and the project team anticipates that a new permit will be issued vs. a permit modification. As the project has been rescoped to remove the existing building and create a significantly larger facility, the basis of design for the permitted infiltration basin is no longer applicable to the project and as such the project requires a modification to the existing Stormwater Permit. Furthermore, the existing infiltration basin is not performing as anticipated in the design and is holding water for extended periods of time. Given this site's immediate proximity to Wilmington International Airport, standing water creates conditions unfavorable to safe airport operations due to reflectivity and attraction of waterfowl. The combination of site hydrologic conditions and proximity to the airport result create a situation where the only option to meet stormwater quality and quantity requirements is a sand filter / dry pond treatment train. The sand filters act as primary stormwater control measures (SCM's) providing water quality treatment and the dry pond provides peak flow attenuation from new development. Refer to plans for more information on the location of the proposed sand filters and dry pond. 1�c ..:, Eng'fiv�ei'n.o Grouts ,nc. iiQ fill, Elise y . g I NATIONAL GUARD READINESS CENTER Mt g a NORTH CAROLINA ARMY NATIONAL GUARD n s 21 - II cn p . € r Q CONTRACT NO. W9133L - 15 - D - 0002 - D 304 wPROJECT NO. 85498371301 o 91 i WILMINGTON, NORTH CAROLINA �rmrcuaw cw.dmia�rnmwo�axi«c�rou.��x-eKu¢e-o r H - \ o- i -- _----- - I NATIONAL GUARD READINESS CENTER a g NORTH CAROLINA ARMY NATIONAL GUARD n I V . CONTRACT NO. W9133L - 15 - D - 0002 - D 304 o os PROJECT NO. 85498371301 W o $ WILMINGTON, NORTH CAROLINA • N:1Mi n355f .a� Ctp�wwpppryptwgtWgfp}�9i9WCARHGRO�O]tfKw • MaP vy a m t L IN ' ? NATIONAL GUARD READINESS CENTER p NORTH CAROLINA ARMY NATIONAL GUARD ' y OF o§ CONTRACT NO. W9133L - 15 - D - 0002 - D 304 PROJECTNO.85498371301 , '"_::,,,@• o a' WILMINGTON, NORTH CAROLINA. NCDENR, North Carolina Department of Environment and Natural Resources Pat McCrory Governor October 14, 2014 LTC Rodney Newton State of North Carolina through the NC Dept. of Public Safety, NC National Guard 1636 Gold Star Dr. Raleigh, NC 27607 Subject: Stormwater Management Permit No. SW8140906 (Wilmington Readiness Center Renovation North Carolina Ntationai Guard High Density Commercial Infiltration Basin Project New Hanover County Dear LTC Newton: John E. Skvarla. IiI Secretary The Wilmin n Regional Office received a complete State Stormwater Management Permit Application for Wilmington Readiness tenter Renovation North Carolina National Guard on October 13, 2014. Staff review of the plans and specifications has determined that the project; as proposed, will comply with the Stormwater Regulations set forth in Session Law 2008-211 and Title 15A NCAC 21-1.1000. We are forwarding Permit No. SW8140906 dated October 14, 2014, for the construction, operation and maintenance of the BMP`s and built -upon area associated with the subject project. This permit shall be effective from the date of issuance until October 14, 2022, and shall be subject to the conditions and limbtiuns as specified therein. Please pay special attention to the conditions listed in this permit regarding the Operation and Maintenance of the BMP(s), recordation of deed restrictions, certification of the BMP's, procedures for changing ownership, transferring the permit, and renewing the permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system, to record deed restrictions, to certify the BMP's, to transfer the permit, or to renew the permit, will result in future compliance problems If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing by filing a written petition with the Office of Administrative Hearings (OAH). The written petition must conform to Chapter 150E of the North Carolina General Statutes, and must be filed with the OAH within thirty (30) days of receipt of this permit. You should contact the OAH with a!! questions regarding the filing fee (if a filing fee is required and/or the details of the filing process at 6714 Mail Service Center, Raleigh, NC 27699-6714, or via telephone at 91 -431- 3000, or visit their website at www.NCOAH.com. Unless such demands are made this permit shall be final and binding. If you have any questions, or need additional information concerning this matter, please contact Kelly Johnson in the Wilmington Regional Office at (910) 796-7331. Sincerely, =- Tracy is, P.E., .Director Division of Energy, Mineral and Land Resources GDS/kpj: G:0Q1SharedlStormwater\Permits & Projects120141140906 HD01410 permit 140906 cc: Mr. Phillip G. Tripp, PE Inspector, New Hanover County Building Inspections New Hanover County Engineering Division of Coastal Management Wilmington Regional Office Stormwater File Division of Energy, Mineral, and Land Resources Land Quality Section — Wilmington Regional Office 127 Cardinal Drive Extension, Wilmington, North Carolina 28406 - (910) 796-7215 / Fax: (910) 350-2004 State Stormwater Management Systems Permit No. SW8 140906 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AHD i4ATURAL RESOURCES DIVISION OF ENERGY, MINERAL AHD LAND RESOURCES STATE STORMWATER MANAGEMENT PERMIT HIGH DEPSITY COMMERCIAL DEVELOPMENT In accordance with the provasons of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO State o North Carolina through the NC Department of Public Safety, NC National Guard Wilmington Readiness Center Renovation North Carolina National Guard 2412. Infantry Rd, Wilmington, New Hanover County FOR THE construction, operation and maintenance of one (1) infiltration basin in compliance with the provisions of Session Law 2008-211 and 15A NCAC 2H .1000 (hereafter the "stormuvaterrules`) and the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved by the Division and considered a part of this permit. This permit shall be effective from the date of issuance until October 14, 2022, and shall be subject to the following specified conditions and limitations: 1. DESIGN STANDARDS This permit is effective only with respect to the nature and volume of s�ormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.8 of this permit. The stormwater control has been designed to handle the runoff from 148,565 square feet of impervious area. 3. The basin has been designed to handle the 10 year 24 hour design storm without discharging therefore neither an LSIVFS nor an offline bypass are required. The tract will be limited to the amount of built -upon area indicated in Section 1.8 of this permit, and as shown on the approved plans. The built -upon area for the future development is limited to 0 square feet. 5. The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system. 6. The project shall provide a 50' wide vegetated buffer adjacent surface waters, measured horizontally from and perpendicular to the normal pool of impounded structures, the top of bank of both sides of streams and rivers, and the mean high water line of tidal waters. 7. Impervious area on the permitted plans that is outside of the drainage area line is not subject to State Stormwater because it was existing development in place prior to 1988. Page 2 of 7 State Stormwater Management Systems Permit No. SW8 140906 8, The following design criteria have been permitted for the infiltration basin and must be provided and maintained at design condition: Drainage Area, acres: Onsite, ft2: Offsite, ft2: b. Total Impervious Surfaces, ft2: Onsite, ft2: Offsite, ft2: C. Design Storm, inches: d. Basin Depth, feet: e. Bottom Elevation, FMSL: f. Bottom Surface Area, ft2: g. Max Stage Elevation of 10yr24hr storm, ft: h. Permitted Storage Volume (1.5inch), ft3: ik. Type of Soil: j. Expected Infiltration Rate, in/hr: k. Seasonal High Water Table, FMSL: I. Time to Draw Down, days: M. Receiving Stream/River Basin: n, Stream Index Number: o. Classification of Water Body: II. SCHEDULE OF COMPLIANCE 5.37 233,947 0 148,565 148,565 0 1.5 0.5 7.5 17,794 10.77 18,232 sand 1.20 5.5 0.43 UT to Smith Creek / Cape Fear 18-74-63 "C; SW11. 1. The stormwater management system shall be constructed in its entirety, vegetated and operational for its intended use prior to the construction of any built -upon surface. 2. During construction, erosion shall be kept tv a minimum and any eroded areas of the system will be repaired immediately. If the stormwater system is used as an Erosion Control device, it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility. The permittee shall follow the approved Operation and Maintenance Agreement in its entirety, and shall provide and perform the listed operation and maintenance procedures at the specified intervals to assure the permitted stormwater system functions at optimum efficiency. 4. Records of maintenance activities must be kept for each permitted BMP. The reports will indicate the date, activity, name of person performing the work and what actions were taken. 5. The facilities shall be constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 6. All stormwater collection and treatment systems must be located in public rights -of -way, common areas or easements. The final plats for the project will be recorded showing all such required rights -of -way, common areas and easements, in accordance with the approved plans. Access to the stormwater facilities shall be maintained via appropriate easements at all times. 7. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Any deviations from the approved plans and specifications must be noted on the Certification. A modification may be required for those deviations. Page 3 of 7 State Stormwater (Management Systems Permit No. SW8140906 8. The permittee shall submit to the Director and shall have received approval for revised plans, specifications, and calculations prior to construction, for any modification to the approved plans, including, but not limited to. those listed below: a. Any revision to any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Redesign or addition to the approved amount of built -upon area or to the drainage area. C. Further deveiopment, subdivision, acquisition, lease or sale of any, all or part of the project area. d. Filling in, altering; or piping of any vegetative conveyance shown on the approved plan. e. The construction of any designated future BUA on the application. 9. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made. Ill. GENERAL COWDITIONS This permit is not traneerabie to any person or entity except after notice to and approval by the Director. The permittee shall submit a completed and signed Name/Ownership Change Form, accompanied by the support'ng documentation as iisted on the form, to the Division at least 60 days prior to any one or more of the following events: a. An ownership change including the sale or conveyance of the project area in whole or in part; b, The sale or conveyance of the common areas to a Homeowner's or Property Owner's Association, subject to the requirements of Session Law 2011-256; c. Bankruptcy; d. Foreclosure; e. Dissolution of the partnership or corporate entity; f. A name change of the current permitiee; g. A name change of the project; h. A mailing address change of the permittee; 2. Tne permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer request. 3. Approved plans, calculations, supplement forms, operation and maintenance agreements and specifications for this project are incorporated by reference and are enforceable parts of the permit, A copy of the approved plans and specifications shall be maintained on file by the Permittee at ali times. 4. Any individual or entity found to be in noncompliance with the terms and conditions of this permit or with the stormwater ra?es, is subject to enforcement action by the Division, in accordance Oth NCGS 143, Article 21. 5. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances, which may be imposed by other government agencies (local, state, and federal) having jurisdiction. 6. to the event that the facilities fail to perform satisfactorily the Permittee shall take immediate corrective action. including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. 7. The permittee grants DENR Staff permission to enter the property during normal business hours for the purpose of inspecting all components of the permitted stormwater management facility. 8. The permit issued shall continue in force and effect until revoked or terminated. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and reissuance or termination does not stay any permit condition. 9. Unless specified elsewhere, permanent seeding requirements for the stormwater controls must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. Page 4 of 7 State Stormwater Management Systems Permit No. SW8 140906 10. The issuance of this permit does not prohibit the Director from reopening and modifying the permit, revok;ng and reissuing the permit, or terminating the permit as allowed by the laws, rules and regulations contained in Session Law 2008-211, Title 15A NCAC 2H.1000, and NCGS 143-215.1 et. al. 11. The permittee shall'submit a permit renewal application at least 180 days prior to the expiration date of this permit. The renewal request must include the appropriate documentation and the processing fee: Permit issued this the W'- day of October 2014, NORT-I CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION D vis- .E., Director Division of Energy, Mineral and Land Resources By Authority of the Environmental Management Commission Page 5 of 7 State Stormwater Management Systems Permit No, SW8 140906 Wilmington Readiness Center Renovation North Carolina National Guard Stormwater Permit No. SW8140906 New Hanover County Designer's Certification I; _ as a duly registered in the State of North Carolina, having been authorized to observe ;periodically/ weekly/ full time) the con&ruction of the project; (Project) for _..(Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is included in the Certification. Noted deviations from approved plans and specifcation: Signature Registration Number Date Page 6 of 7 State Stormwater Management Systems Permit No. SW8 140906 Certification Requirements: 1. The drainage area to the system contains approximately the permitted acreage, 2. The drainage area to the system contains no more than the permitted amount of built -upon area. �_3. All the built -upon area associated with the project is graded such that the runoff drains to the system. 4. All roof drains are located such that the runoff is directed into the system. 5. The bypass structure weir elevation is per the approved plan. 6. The bypass structure is located per the approved plans. 7. A Trash Rack is provided on the bypass structure. __._8. All slopes are grassed with permanent vegetation. _ 9. Vegetated slopes are no steeper than 3:1. _10, The inlets are located per the approved plans and do not cause short-circuiting of the system. 11. The permitted amounts of surface area and/or volume have been provided. 12. All required design depths are provided, 13. All required parts of the system are provided. 14. The required system dimensions are provided per the approved plans. cc: NCDENR-DEMt_R Wilmington Regional Office Inspector, New Hanover County Building Inspections Page 7 of 7 RCDENR G, C �iL..!eD. Fr[rient of Env'irDilmein" and N'Mura' Resou "CCs Pat -Crory John E. Skvarla, !I Governor Secretary September 29, 2014 `,ETTER OF APPROVA., -WITH MODIFICATIONS AND E' R-70RI�ANCE RESERVATIONS NC I�TATIONAL GUARD, DEPARTMENT OF PUBLIC SAFETY ATTN: RODNEY NEWTOi� 1636 GOLD STAR DRIVE, SU I'1 E 2600 RALEIGH. NC 27607 RE: Project Name: WM-MINGTON READ�TESS CENTER RENOVATION NORTH CAR.OLINA NATIONAL GUARD Acres .Approved: 5.0 Project ID: NEWILA-2015-007 County: New Hanover. City: Wilmington Address: Infantry Road River Basin: Cape Fear Stream Classification.: Other Submitted. By: Monica. L. Valsi, E.I., Tripp Engineering, P.C. Date Received by LQS: September. 5, 2014 and September 26, 2014 Plan Type: Institutional Dear Mr.. Newton: This office has reviewed the subject erosion and sedimentation control plan. We :find the plan to be acceptable and hereby issue this Letter of Approval. The enclosed Certificate of Approval must be posted at the job site. This plan approval shall expire three (3) years .following the date of approval, if no land -disturbing activity has been undertaken, as is required by Title 15A NCAC 4B .0129. Please be aware that your project will be covered by the enclosed NPDES Construction Storm.water General Permit NCG010000. Please become familiar with all the requirements and conditions of this permit in order to achieve compliance. Title 15A NCAC 4B .0118(a) requires that a copy of the approved erosion control plan be on file at the job site. Also, this letter gives the notice required by G.S. 113A-61.1(a) of our right of periodic inspection to ensure compliance with the approved plan. Division of Energy, Mineral, and Land Resources Energy Section - Geological Survey Section - Land Quality Section 127 Carding: Drive Extension Wilmington, NC 28405-PHONE: 910-796-7215/ FAX: 910-360-2004 Internet: hllp:ltgortal.ncdenr.oro/weblirl An Equal Opportunity 1 Affirmative Action Employer - 50% Recycled 110% Post Consumer Paper 1-cltcr of Approval -whb Modifications and Per.orixlance. Res: rvadons Rodney \ evvion September 2c), 2014 Pane 2 of 4 '.North Carolina's Sedimentation Pollution C,ontroi Act is performance -oriented, requiring protection of existing natural resources and adjoining propenies. If, following the commencement o.f:'this project, the erosion and sedimentation control plan is inadequate to meet the requirements of the Sedimentation Pollution Control Act of 1973 (North Carolina General Statute I I3A.-_5l through 66), this office may require revisions to the plan and implementation of the revisions to ensure compliance with the Act. Acceptance and approval of this plan is conditioned upon your compliance with Federal and State water quality laws. regulations. and rules. In addition, local city or county ordinances or rules may also apply to this land -disturbing activity. This approval does not supersede any other permit or approval. Please note that this approval is based in part on the accuracy of the .information provided in the Fira.ancial. Responsibility Form, which you provided. You are requested to ir.le an amended form if there is any change in the information included on the form.. In addition, it would be helpful if you notify this office of the proposed starting date for this project.. Please notify us if you plan to have a preconstruction conference. Your cooperation is appreciated. Sincerely, -; Rhonda Hall Assistant Regional Engineer Land Quality Section Enclosures: Certificate of Approval Modifications and Performance Reservations NPDES Permit cc: Monica L. Valsi, E.I., Tripp .Engineering, P.C., 41.9 Chestnut Street, Wilmington, l\1C 28401 Letter of Approval with Modifications and Performance Reservations Rodney 'newton September 29. 2014 Page 3 of 44 MGD1Y1CA,.T. 0NS AND & . Project Name: W1.I..MINGTON READINESS CENTER RENOVATION'NORTH CAROLINA NATIONAL GUARD Project ID: NEWHA-2015-007 County: New Hanover This plan approval shall expire three (3) years following the date of approval, if no land -disturbing activity has been undertaken. as is required by Title I5A NCAC 4l3 .0129. 2. The developer is responsible for the control of sediment on -site. If the approved erosion and sedimen' tion control measures prove insufficient. the devLlopar must take those addition -A steps necessary to stop sediment from leaving this site. Each sediment storage device must be inspected after each storm event. Maintenance and/or clean out is necessary anytime the device is at 50% capacity. All sediment storage measures will remain on site and functional until all grading and final landscaping of the project is complete. Any and all existing ditches on this project site are assumed to be left -undisturbed by the proposed development unless otherwise noted. The removal of vegetation tiivithin any existing ditch or channel is prohibited unless the ditch or channel is to be regarded with side slopes of 2 horizontal to 1 vertical or less steep. Bank slopes may be mowed, butstripping of vegetation is considered new earth work and is subject to the same erosion control requirements as new ditches. 4. The developer is responsible for obtaining any and all permits and approvals necessary for the development of this project prior to the commencement of this land disturbing activity. This could include our agency's Stotmwater regulations and the Division of Water Resources' enforcement requirements within Section 401 of the Clean Water Act, the U.S. Army Corps of Engineers' jurisdiction of Section 404 of the Clean Water Act, the Division of Coastal Management's LAMA requirements. the Division of Solid Waste Management's landfill regulations, the Environmental Protection Agency and/or The U.S. Army Corps of Engineers jurisdiction of the Clean Water Act, local County or Municipalities' ordinances, or others that may be required. This approval cannot supersede any other permit or approval; however, in the case of a Cease and Desist Order from the Corps of Engineers, that Order would only apply to wetland areas. All highland would still have to be in compliance with the N,C. Sedimentation Pollution Control Act. 5. If any area on site falls within the jurisdiction of Section 401 or 404 of the Clean Water Act, the developer is responsible for compliance with the requirements of the Division of Water Resources (DWR), the Corps of Engineers and the Environmental Protection Agency (EPA) respectively. Any erosion control measures that fall within jurisdictional wetland areas must be approved by the aforementioned agencies prior to installation. The Land Quality Section must be notified of a relocation of the measures in question to the transition point between the wetlands and the uplands to assure that the migration of sediment will not occur. If that relocation presents a problem or contradicts any requirements of either DWR, the Corps, or the EPA, it is the responsibility of the developer to inform the Land Quality Section regional office so that an adequate contingency plan can be made to assure sufficient erosion control remains on site. Failure to do so will be considered a violation of this approval. Lester oi' Allpro\ al «.it.in Nllodi.-_5ca.ions and Peribrin tnce Reser4' ttons Rodnev Ne-%vton September 29. 2014 Wage 4 of 4 6. Any borrow material brought onto this site must be from a legally operated mine or other approved source. Any soil waste that leaves Lhis site can be transported to a permitted mine or separately permitted construction sites v,,ithout additional permits. Disposal at imy other locatior: would have to be included as a permit revision for this approval. 7. This permit allow,Ns for o landd-isiuribmice. as called for on the application plan, not to exceed 5_0 acres. Exceeding that acrea.g:; wilt bt violation of this permit and would require a revised plan and additional application fee. Any addition in impervious surface. over that already noted on the approved plan. 'Mould also require a revised plat: to vitrify the appropriateness of the erosion control measures and storirwater retention treasures. 8. The construction detail. for the proposed silt fence requires reinforcing wire and steel posts a maximum of eight (8) feet apart. Omission of the reinforcing wire is a construction. change that necessitates more posts for support; i.e.. the spacing Jistance needs to be reduced to no greater than s:x (6) feet apart. 9. Because the sediment traps and basins are shown on the plan as the primary sedimentation and erosion ,=trot devices on this project, it is necessary that the traps and basins and their collection systems be ins�alled before any other grading takes place on site, and that every structure that receives more than one acre of drainage is built so that each dewaters only from the surface. if that proves to be impractical, a revised plan must be submitted and approved that addresses erosion and sediment control needs during the interim period until the traps and basins are fully functioning. 10. A graveled construction entrance must be located at each point of access and egress available to construction vehicles during the grading and construction phases of this project. Access and egress from the project site at a point without a graveled entrance will be considered a violation of this approval. Routine maintenance of the entrances is critical. 11.. As a condition of the provided NPDES General Storrriwater Permit, groundcover stabilization must meet specific time frames. Slopes (including cuts, fills, and ditch banks) that are steeper than 3 horizontal to I vertical left exposed will, within seven (7) calendar days after completion of any phase of grading, be provided with groundeover. Slopes that are 3 horizontal to I vertical or flatter will be provided with groundcover within fourteen (14) calendar days. 12. As a part of routine monitoring of the approved land -disturbing activity, the financially responsible party shall assure inspections of the area covered by the approved plan after each phase of the plan has been completed and after establishment of temporary ground cover in accordance with North Carolina General Statute 113A-54.1(e). Weaver, Cameron From: Gollings, Jamie E. <Jamie.Gollings@jacobs.com> Sent: Wednesday, May 31, 2017 7:59 AM To: Weaver, Cameron Cc: vickie.a.dudick.nfa@maiLmil; MAJ Kent Caldwell USARMY NCARNG; william.s.burriola.mil@mail.mil; Ruff, Brian P Sr NFG NG NCARNG (US); rodney.d.newton.mil@mail.mil; Langenfeld, Paul; Wainwright, Thomas J. Subject: National Guard Readiness Center - Express Review Request Attachments: REQUEST FOR EXPRESS form FINAL.docx; EC Permit.pdf, WilmNationalGuard SW Permit.pdf Cameron, Please find attached a request for Express Review for stormwater and erosion control. The project will include a modification to the existing stormwater permit and there was a previous erosion control permit granted for the site both are attached. Please let us know your staff's earliest availability for an Express Review for this project and anything that you may need from us to proceed. Thank you in advance, Jamie E. Gollings, PE I Civil Engineer J_ACOBS CI fi e: 111 Corning I-io&d, .Suite 200, v lr- N!" ::n Start: �:3if(:�:41.'.g.�;`�.c•id2 iamie.gollinigs@iacobs.com i www.macobs.com NOTICE -'""k COMITI !':'CDUC-1 mi::,, c]n:- on( rJJ:. 1;':%:7;i.?lf ::!i i'?"' i=; for. ub Kok. Cr:'. of'I'Le: intcindfr (i rccipient. r,`Pr ui :vdnbl, copying or cis`.ribut,�n c;, c:: -: ��e on ti's im :ssage by �r.'nt�r:�ea reriF;crtc is str`. �I. �:', h't teQ. if you i1av� . _� .::0 tl1i r;cessage in crror, ^ie r::.:y L•> Imr.:, iutc:ly Ly rc �.Iyinra to'd i1�, ':s,?gc : r.i (i. k'Linn is Sior:'f..' COrri:;'ti d'. MEMORY TRANSMISSION REPORT FILE NO. DATE TO DOCUMENT PAGES START TIME END TIME PAGES SENT STATUS 448 08.02 08:00 ft 919198595151 10 08.02 08:00 08.02 08:07 10 OK TIME :08-02-2017 08:07 FAX NO.1 :9103502004 NAME :Mainfax JACOBS TO: Kelly Johnson NCDEQ 127 Cardinal Drive Extension Wilmington, NC 27601 FROM: Jamie Gollings DATE: FAX: Cc: LETTER OF TRANSMITTAL 7/18/17 919.600.1163 PHONE: 919.600.1163 PROJECT: North Carolina National Guard Readiness Center PROJECT#: NA Please find the following items for: Transmitted via: 0 Review and Comment 0 Fax # Of Fax pages 0 Approval 0 Mail ❑ Pick-up ❑Hand Delivery 0 Your Use 0 Fed -Ex COPIES DATE DESCRIPTION 1 7/18/17 Stormwater Report 2 N/A Plan Set REMARKS: Please find the attached for your use. Please let me know if you need anything else. JACOBS ENGINEERING GROUP INC., 111 CORNING ROAD, SUITE 200, CARY, NC 27518 TELEPHONE (919) 859-5000 FAX (919) 859-5151 Casmer, Jo From: Casmer, Jo Sent: Wednesday, July 12, 2017 9:01 AM To: 'jamie.gollings@jacobs.com' Cc: Weaver. Cameron (cameron.weaver@ncdenr.gov) Subject: Wilmington National Guard Readiness Center - SW8 140906 Attachments: SW8140906 Permit Fee Receipt.pdf I understand from Cameron Weaver that you wish to have a receipt for the permit fee paid for the captioned project application. It is attached as requested. Jo Casmer Administrative Assistant for DEMLR/Stormwater Section North Carolina Department of Environmental Quality Department of Environmental Assistance & Customer Service 910 796-7336 office 910 350-2004 fax io. casmerAncdenr.gov 127 Cardinal Drive Extension Wilmington, NC 28405 A1 01. -'>-",Nothing Compwes,,,- Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. Energy. Mineral LandResources ENVIMMMENTAL d11A0.1TY ROY COOPER GoWma MICHAEL S. R.EGAN $fty aoy TRACY DAVIS UrnK lol PERMIT PAYMENT .RECEIPT Check No: 221. Check Date: 7/11 i-1017 Clieck Amount- $4,000.00 Received From: Jamie E. Gollings Received On: 71,11 /20 f 7 For: 5tortx>:water Permit SW8 140906 Express M- Ajor Modification; National Guard Readiness Center (Wilmingtoril Balance Due: $0.00 Slate of Noilh L o ol+n:t tit rna �:•;rnaa r1t litr T f+C 9°�, Alit.:Ta! aj:u! two kesa �rcc s 4�'t!mi{x�ton Reaiona! if7;3ct• . !:�; i'a�AL;att)r'��i �x!cncor i ;L',1r,�ilxfiry:. �C 7E;•,i! Weaver, Cameron From: Taylor, Kenneth Sent: Thursday, July 06, 2017 2:25 PM To: Weaver, Cameron Subject: FW: Wilmington MILCON Environmental Reviews Cameron Weaver, I attended a meeting last week with LTC Cale Moody concerning the North Carolina National Guard Wilmington Readiness Center MILCON project. This is a $15 million Federally funded of FY13 funds must be award by 30 September. He asked me to see if th July 25 at 110C for project review could be moved o July 11th s that a 17 August solicitation could be done. m e if the earlier date of July 11th. Wo e p ssi le. Thank you for your assistance. LTC Moody's follow-up e-mail is shown below. Kenneth Dr. Kenneth B. Taylor, PG State Geologist of North Carolina N.C. Geological Survey North Carolina Department of Environmental Quality 919 707-9211 office 919 390-4767 mobile Kenneth.B.Taylor@ncdenr.gov Archdale Building 5th Floor, Suite 527 512 N Salisbury St, Raleigh, NC 27604 1612 Mail Service Center Raleigh, NC 27699-1612 Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. -----Original Message ----- From: Moody, Cale D LTC USARMY NG NCARNG (US) [mailto:cale.d.moody.mil@mail.mil] Sent: Thursday, July 06, 2017 12:13 PM To: Taylor, Kenneth <kenneth.b.taylor@ncdenr.gov> Subject: Wilmington MILCON Environmental Reviews Dr. Taylor, I just wanted to touch base with you on the discussion we had last week at the NCEM Energy Retreat regarding possibly getting the erosion control and storm water environmental reviews with DEQ scheduled earlier. They are currently scheduled for 25 JULY and if we could get them scheduled for on or around 11 July 2017 that would be awesome. As I mentioned this is FY13 money and if not awarded by 30 SEP 2017, we will lose the $15M funding. Appreciate your assistance greatly. Thank you, Cale D. Moody, PLS LTC, EN Fulltime: CFMO Deputy/Business Manager Office: (984) 664-6203 M-Day: CDR, 105th EN BN (RHINO 6) Office: (984) 661-2272 Mobile: (828) 734-9191 cale.d.moody.mil@mail.mil Weaver, Cameron From: Dudick, Vickie A NFG NG NCARNG (US) <vickie.a.dudick.nfg@mail.mil> Sent: Tuesday, June 27, 2017 4:28 PM To: Weaver, Cameron Cc: Scott, Georgette; Newton, Rodney D LTC USARMY NG NCARNG (US); Burriola, William S H CW2 USARMY NG NCARNG (US); Gollings, Jamie E. Subject: RE: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review Cameron- Per our conversation this afternoon, the NCARNG would like to switch the Jacksonville express review with Wilmington's review date. This puts Wilmington submittal meeting scheduled for 7/25 @ 11am at the Wilmington DEq office and Jacksonville scheduled for 8/2. Thank you for your consideration. Vickie A. Dudick Director of Environmental Management North Carolina National Guard 1636 Gold Star Drive Raleigh, NC 27607 984-664-6186 vickie.a.dudick.nfg@mail.mil -----Original Message ----- From: Weaver, Cameron[mailto:cameron.weaver@ncdenr.gov] Sent: Tuesday, June 27, 2017 9:38 AM To: Dudick, Vickie A NFG NG NCARNG (US) <vickie.a.dudick.nfg@mail.mil> Cc: Scott, Georgette <georgette.scott@ncdenr.gov>; Newton, Rodney D LTC USARMY NG NCARNG (US) <rodney.d.newton.mil@mail.mil>; Burriola, William S II CW2 USARMY NG NCARNG (US) <william.s.burriola.mil@mail.mil> Subject: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review All active links contained in this email were disabled. Please verify the identity of the sender, and confirm the authenticity of all links contained within the message prior to copying and pasting the address to a Web browser. Hi Vickie Cameron- Any update on the Express Review for the NCARNG permits? Is the NCARNG on the schedule or do you need anything additional from us? Has another Reviewer been assigned? Thank you for your prompt attention. Vickie A. Dudick Director of Environmental Management North Carolina National Guard 1636 Gold Star Drive Raleigh, NC 27607 984-664-6186 vickie.a.dudick.nfg@mail.mil < Caution-mailto:vickie.a.dudick.nfg@mail.mil > -----Original Message ----- From: Weaver, Cameron [Caution-mailto:cameron.weaver@ncdenr.gov < Caution-mailto:cameron.weaver@ncdenr.gov > ] Sent: Thursday, June 15, 2017 3:21 PM To: Dudick, Vickie A NFG NG NCARNG (US) <vickie.a.dudick.nfg@mail.mil < Caution-mailto:vickie.a.dudick.nfg@mail.mil > > Cc: Scott, Georgette <georgette.scott@ncdenr.gov < Caution-mailto:georgette.scott@ncdenr.gov > > Subject: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review All active links contained in this email were disabled. Please verify the identity of the sender, and confirm the authenticity of all links contained within the message prior to copying and pasting the address to a Web 3 Cameron Weaver Environmental Assistance Coordinator -Wilmington Regional Office NCDEQ-Division of Environmental Assistance and Customer Service 127 Cardinal Drive Ext. Wilmington, NC 28405 910-796-7303 NCDEQ NEW WEBSITE: Caution-Caution-http://deq.nc.gov/ DEACS NEW WEBSITE: Caution-Caution-http://deq.nc.gov/about/divisions/environmental-assistance-c ustomer- service E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. -----Original Message - From: Dudick, Vickie A NFG NG NCARNG (US) [Ca ution-Caution-mailto:vickie.a.dudick.nfg@mail. mi1] Sent: Thursday, June 15, 2017 2:48 PM To: Weaver, Cameron <cameron.weaver@ncdenr.gov < Caution-mailto:cameron.weaver@ncdenr.gov > > Cc: Burriola, William S II CW2 USARMY NG NCARNG (US) <william.s.burriola.mil@mail.mil < Caution-mailto:william.s.burriola.mil@mail.mil > > Subject: RE: National Guard Readiness Center Wilmington Express Review E Weaver, Cameron To: cale.d.moody.mil@mail.mil Cc: Dudick, Vickie A NFG NG NCARNG (US); Scott, Georgette Subject: FW: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review Hi LTC Moody: After hearing third -hand about your situation, I wanted to reach out to you directly. We make every effort to accommodate schedules, but reviews are scheduled based on when the requests are received in our system and are spaced to allow the individual attention that is needed to expedite the application reviews. We have a very limited staff available to conduct Express Reviews. In this case, after conversing via emails with Ms. Dudick, the review was already been moved up once in our scheduling by more than a week by switching with the NGRC project in Jacksonville. I have now reached out to additional staff to see if they can accommodate your request. Cameron Weaver Environmental Assistance Coordinator -Wilmington Regional Office NCDEQ-Division of Environmental Assistance and Customer Service 127 Cardinal Drive Ext. Wilmington, NC 28405 910 796-7303 NCDEQ NEW WEBSITE: http://deq.nc.gov/ DEACS NEW WEBSITE: http://deq.nc.gov/about/divisions/environmental-assistance-customer-service E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. -----Original Message ---- From: Dudick, Vickie A NFG NG NCARNG (US)[mailto:vickie.a.dudick.nfg@mail.mil] Sent: Tuesday, June 27, 2017 4:28 PM To: Weaver, Cameron <cameron.weaver@ncdenr.gov> Cc: Scott, Georgette <georgette.scott@ncdenr.gov>; Newton, Rodney D LTC USARMY NG NCARNG (US) <rodney.d.newton.mil @mail.mil>; Burriola, William S II CW2 USARMY NG NCARNG (US) <william.s.burriola.mil@mail.mil>; Gollings, Jamie E. <Jamie.Gollings@jacobs.com> Subject: RE: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Fxpress Review Cameron- Per our conversation this afternoon, the NCARNG would like to switch the Jacksonville express review with Wilmington's review date. This puts Wilmington submittal meeting scheduled for 7/25 @ 11am at the Wilmington DEQ office and Jacksonville scheduled for 8/2. Thank you for your consideration. Vickie A. Dudick Director of Environmental Management North Carolina National Guard 1636 Gold Star Drive Raleigh, NC 27607 984-664-6186 vickie.a.dudick.nfg@mail. miI -----Original Message ----- From: Weaver, Cameron [mailto:cameron.weaver@ncdenr.gov] Sent: Tuesday, June 27, 2017 9:38 AM To: Dudick, Vickie A NFG NG NCARNG (US) <vickie.a.dudick.nfg@mail.mil> Cc: Scott, Georgette <georgette.scott@ncdenr.gov>; Newton, Rodney D LTC USARMY NG NCARNG (US) <rodney.d.newton.mil@mail.mil>; Burriola, William S II CW2 USARMY NG NCARNG (US) <william.s.burriola.mil@mail.mil> Subject: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review All active links contained in this email were disabled. Please verify the identity of the sender, and confirm the authenticity of all links contained within the message prior to copying and pasting the address to a Web browser. Hi Vickie. You should be hearing from Jamie Gollings, your consultant of record on the request. This meeting has been scheduled forAugust 2 at 11 AM here at the Wilmington DEQ offices. Let me know of any issues Cameron Cameron Weaver Environmental Assistance Coordinator -Wilmington Regional Office NCDEQ-Division of Environmental Assistance and Customer Service 127 Cardinal Drive Ext. Wilmington, NC 28405 910-796-7303 NCDEQ NEW WEBSITE: Caution-http://deq.nc.gov/ DEACS NEW WEBSITE: Caution-http://deq. nc.gov/about/divisions/environmenta I -assistance -customer - service E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. -----Original Message ----- From: Dudick, Vickie A NFG NG NCARNG (US) [Caution-mailto:vickie.a.dudick.nfg@mail.mil] Sent: Tuesday, June 27, 2017 8:33 AM To: Weaver, Cameron <cameron.weaver@ncdenr.gov> Cc: Scott, Georgette <georgette.scott@ncdenr.gov>; Newton, Rodney D LTC USARMY NG NCARNG (US) <rodney.d.newton.mil@mail.mil>; Burriola, William S II CW2 USARMY NG NCARNG (US) <william.s.burriola.mil@mail.mil> Subject: RE: National Guard Readiness Center Wilmington Express Review Cameron- Any update on the Express Review for the NCARNG permits? Is the NCARNG on the schedule or do you need anything additional from us? Has another Reviewer been assigned? Thank you for your prompt attention. Vickie A. Dudick Director of Environmental Management North Carolina National Guard 1636 Gold Star Drive Raleigh, NC 27607 984-664-6186 vickie.a.dudick.nfg@mail.mil < Caution-mailto:vickie.a.dudick.nfg@mail.mil > -----Original Message ----- From: Weaver, Cameron [Caution-mailto:cameron.weaver@ncdenr.gov < Caution-mailto:cameron.weaver@ncdenr.gov > ] Sent: Thursday, June 15, 2017 3:21 PM To: Dudick, Vickie A NFG NG NCARNG (US) <vickie.a.dudick.nfg@mail.mil < Caution-mailto:vickie.a.dudick.nfg@mail.mil > > Cc: Scott, Georgette <georgette.scott@ncdenr.gov < Caution-mailto:georgette.scott@ncdenr.gov > > Subject: [Non-DoD Source] RE: National Guard Readiness Center Wilmington Express Review All active links contained in this email were disabled. Please verify the identity of the sender, and confirm the authenticity of all links contained within the message prior to copying and pasting the address to a Web browser. Hi Vickie. The quickness of the review is directly proportional to the completeness of the initial permit application packet that is brought to and discussed in the submittal meeting. The review meeting is scheduled so that the reviewer 4 is able to put their attention on that particular project immediately, but it is a balancing act between ongoing Express reviews in house already with the reviewer and when the reviewer will be able to issue the permit from the latest Express submittal. The 30 days covers the reasonable assumption that two rounds of additional information will be needed from the applicant to complete the review. The more complete the application, the faster the overall turnaround for permit issuance. I'll be in touch on Monday with a date that a reviewer will be able to meet concerning the Express Review. Let me know of any other issues. Cameron Cameron Weaver Environmental Assistance Coordinator -Wilmington Regional Office NCDEQ-Division of Environmental Assistance and Customer Service 127 Cardinal Drive Ext. Wilmington, NC 28405 910-796-7303 NCDEQ NEW WEBSITE: Caution-Caution-http://deq.nc.gov/ DEACS NEW WEBSITE: Caution-Caution-http://deq.nc.gov/about/divisions/environmental-assistance-c ustomer- service 5 E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. -----Original Message ----- From: Dudick, Vickie A NFG NG NCARNG (US) [Caution-Caution-mailto:vickie.a.dudick.nfg@mail.mil] Sent: Thursday, June 15, 2017 2:48 PM To: Weaver, Cameron <cameron.weaver@ncdenr.gov < Caution-mailto:cameron.weaver@ncdenr.gov > > Cc: Burriola, William S II CW2 USARMY NG NCARNG (US) <william.s.burriola.mil@mail.mil < Caution-mailto:william.s.burriola.mil@mail.mil > > Subject: RE: National Guard Readiness Center Wilmington Express Review Cameron- Just want to clarify what you told us on the phone today- After the DEQ office meeting and acceptance, 30 days is required for express permitting? My understanding is the Express review for Erosion Control averages 1.6 days and express review for Storm Water control averages 7.6 days. Please let us know if this has changed from the attached. Thank you. Caution-Caution-http://deq.nc.gov/permits-regulations/express-permitting -----Original Message ----- From: Dudick, Vickie A NFG NG NCARNG (US) Sent: Thursday, June 15, 2017 1:25 PM To: 'cameron.weaver@ncdenr.gov'<cameron.weaver@ncdenr.gov < Caution-mailto:cameron.weaver@ncdenr.gov > > 6 Cc: Burriola, William S II CW2 USARMY NG NCARNG (US) <william.s.burriola.mil @mail.miI < Caution-mailto:william.s.burriola.mil@mail.mil > >; Morris, Thomas S NFG NG NCARNG (US) <thomas.s.morrisl.nfg@mail.mil < Caution-mailto:thomas.s.morrisl.nfg@mail.mil > >; Newton, Rodney D LTC USARMY NG NCARNG (US) <rodney.d.newton.mil@mail.mil < Caution-mailto:rodney.d.newton.mil@mail.mil Subject: National Guard Readiness Center Wilmington Cameron- Per our conversation today, the NCARNG requests another Reviewer to expedite the National Guard Readiness Center Stormwater and Land Quality Express Permit Review. This project is a Federal contract with fiscal year 2017 funds which must be executed prior to September 30, 2017. Solicitation of bids can occur but the permits must be secured before the bids can be opened. Please note my correct email below. Thank you for your consideration. Vickie A. Dudick Director of Environmental Management North Carolina National Guard 1636 Gold Star Drive Raleigh, NC 27607 984-664-6186 vickie.a.dudick.nfg@mail.mil < Caution-mailto:vickie.a.dudick.nfg@mail.mil > sw<� jyn9N� DIVISION OF WATER QUALITY INFILTRATION SYSTEM INVESTIGATION Complete and email this form to Vincent.Lewis@ncmail.net. If there are more than 7 areas to be tested, attach a second sheet. Q State Soil Scientist Confirmation Visit date/time: Project Name: Wilmington National Guard County: New Hanover Street Address: 2412 Infantry Road; Wilmington, NC 28405 Directions from the nearest intersection of two major roads: approx. 4200 If north from intersection of MLK Jr Pkwy and North Kerr Ave. to Control Tower Drive to Infantry Road: awrox. 900 If to project site >1 acre being disturbed? ®YES ❑NO CAMA Major required? ❑YES ®NO Consultant Name: Monica Valsi Phone: 910-763-5100 Consultant Firm Name: Tripp Engineering, P.C. Bore Number 1 2 3 4 5 i a Existing Ground Elevation 14 b Proposed Bottom Elevation 7.5 I� c Difference a minus b 6.5 I d Add 2 ft. Min. Bore Depth) 8.5 h e Hardpan Depth? - f Approx. Elev. Of SHWT 5.5 Max. lowest bottom elev. 7.5 h Infiltration Rate OK? _ i Confirmation of SHWT * 1d I For projects requiring more than 5 hand borings, manpower or equipment to conduct the excavation must be provided by the consultant. *State Soil Scientist Use ONLY C, Th Sl40 Cw & ^ 1;A -lip Slaw/ CA 2, ��i� � �h ✓ h') Required Attachments: 1. Legible vicinity map. 2. Complete Soils Report. 3. PDF formatted site plan with the boring locations to be tested. Site plans should be emailed or hand -delivered only. Illegible faxed maps will not be accepted. All proposed infiltration areas and existing, active utility lines located within the proposed basin/trench must be marked and flagged. If these areas are not flagged, the Soils Scientist reserves the right to decline to do the investigation. If the proposed infiltration system will be located in an area of existing pavement and there is no open area nearby, equipment capable of breaking through the .impervious layer must be provided. The soils investigation does not take the place of a soils report prepared by an appropriate professional. The Soils Scientist will only verify the soil conditions that are reported in the Soils Report, and make a determination as to the suitability of the site to meet the infiltration design requirements under NCAC 2H.1000, and assumes no liability should the system fail. S:\WQS\STORMWATER\FORMS\infiltration site visit Revised 3/08