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HomeMy WebLinkAboutSW8110901_CURRENT PERMIT_20230201 STORMWATER DIVISION CODING SHEET POST-CONSTRUCTION PERMITS PERMIT NO. SW8 110 c10 1 DOC TYPE © CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE Z 0 2 3 C)2 0 i YYYYMMDD M STATE q yd rwn ' ROY COOPER p Governor C ELIZABETH S.BISER Secretary DOUGLAS R.ANSEL NORTH CAROLINA Interim Director Environmental Quality February 111, 2023 NGP VI Wilmington NC LLC Attn: David Kent, Manager 1650 Tysons Blvd, Suite 1500 McLean, VA 22102 Subject: Permit Renewal Post-Construction Stormwater Management Permit No. SW8110901 Wilmington Veterans Administration Outpatient Clinic New Hanover County Dear Mr. Kent: The Division of Energy, Mineral and Land Resources received a complete 8-year Permit Renewal Application for the subject permit on December 20', 2022. The Division is hereby notifying you that permit SW8110901 has been renewed, updated, and re-issued on February ht, 2023, as attached. A copy of the current operation and maintenance agreement is also enclosed. Please be aware that the renewal and re-issuance of this stormwater permit does not imply that the site is currently in compliance. This permit shall be effective until September 201h,2029 and does not supersede any other agency permit that may be required. The project shall be subject to the conditions and limitations as specified therein. This permit does not impose new or increased stormwater control requirements; it clarifies the rules and requirements of this program to provide you with a better understanding of your obligations under this permit. Failure to comply with these requirements will result in future compliance problems. Please note that this permit is not transferable except after notice to and approval by the Division. 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 (CAI-1). 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.NCOAff.com. Unless such demands are made this permit shall be final and binding. If you have any questions concerning this permit, please contact Aisia Freeman in the Wilmington Regional Office, at phone#(910) 796-7318 or Aisia.freeman@ncdenr.gov. Sincerely, C1 z w t' MOO A,-,Brian Wrenn, Director Division of Energy, Mineral and Land Resources Enclosures: Attachment C—Permitting History Copy of the Renewal Application Documents Copy of the current operation and maintenance agreement DES/af: \\\Storrnwater\Permits&Projects\201 1\110901 HD\2023 02 permit 110901 ®N��� North Carolina Department of Environmental Quality I Division of Energy,Mineral and land Resources Wilmington Regional office 1127 Cardinal Drive Extension I Wilmington,North Carolina 28405 o�wmrsWeawmw�,u—N, 910.796.7215 Post Construction Stormwater Management Permit No. SW8110901 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF ENERGY, MINERAL AND LAND RESOURCES POST- CONSTRUCTION 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 NGP VI Wilmington NC LLC Wilmington VA Outpatient Clinic Gardner Drive and Airport Boulevard, Wilmington, New Hanover County FOR THE construction, operation and maintenance of two (2) wet detention ponds in compliance with the provisions of 15A NCAC 2H .1000 and Session Law 2008-211 (hereafter collectively referred to as the "stormwater rules') as outlined in the application, approved stormwater management plans, supplement, calculations, operation and maintenance agreement, recorded documents, 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"). The project shall be constructed, operated and maintained in accordance with these approved plans and specifications. The approved plans and specifications are incorporated by reference and are enforceable part of this permit. This permit shall be effective from the date of issuance until September 20t", 2029 and shall be subject to the following specified conditions and limitations. 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 condition. 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. 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. The stormwater system has been approved for the management of stormwater runoff as described on page 2 of this permit. 3. A 50' wide vegetative buffer must be provided 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. 4. The tract will be limited to the amount of built-upon area indicated in Sections 1.2 and 1.7 of this permit, and per approved plans. The built-upon area for the future development is limited to 0 square feet. Page 1 of 5 Post Construction Stormwater Management Permit No. SW8110901 5. All stormwater collection and treatment systems must be located in either dedicated common areas or recorded easements. The final plats for the project will be recorded showing all such required easements, in accordance with the approved plans. 6. The runoff from all built-upon area within the permitted drainage areas of this project must be directed into the permitted stormwater control system. 7. The following design criteria have been provided in the wet detention ponds and must be maintained at design condition: Pond DA1 Pond DA2 a. Drainage Area, acres: 8.73 5.60 Onsite, ft2: 380,460 243,936 Offsite, ft2: 0 0 b. Total Impervious Surfaces, ft2: 276,262 146,745 Onsite, ft2: 276,262 146,745 Offsite, ft2: 0 0 C. Design Storm, inches: 1.5 1.5 d. Average Pond Design Depth, feet: 5.5 4.5 e. TSS removal efficiency: 90% 90% f. Permanent Pool Elevation, FMSL: 24.0 24.0 g. Permanent Pool Surface Area, ft2: 35,854 15,224 In. Permitted Storage Volume, ft3: 33,815 18,168 i. Temporary Storage Elevation, FMSL: 25.0 25.05 j. Pre-dev. 1 yr-24 hr. discharge rate, cfs: 0.348 0.223 k. Controlling Orifice: 3"0 pipe 2"0 pipe I. Orifice flowrate, cfs: 0.128 0.060 M. Permitted Forebay Volume, ft3: 36,863 11,417 n. Fountain Horsepower 1/2 1/6 o. Receiving Stream/River Basin: Smith Creek / CPF P. Stream Index Number: 18-74-63 q. Classification of Water Body: "C Sw" II. SCHEDULE OF COMPLIANCE 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. 3. The permittee shall, at all times, provide and perform the operation and maintenance necessary to assure the permitted stormwater system functions at the design condition in accordance with the signed and approved Operation and Maintenance Agreements, 4. Records of maintenance activities must be kept and made available upon request to authorized personnel of DEMLR. The records will indicate the date, activity, name of person performing the work and what actions were taken. 6. The facilities shall be constructed, operated and maintained in accordance with the provisions of this permit, the approved plans and specifications, and the supporting documents attached to this permit and on file with the Division. 7. A copy of the lease agreement that outlines the stormwater system operation and maintenance responsibilities for NGP VI Wilmington NC LLC, must be kept with the permit and maintenance activities records. Page 2 of 5 Post Construction Stormwater Management Permit No. SW8110901 8. Decorative spray fountains are allowed in the pond, subject to the following criteria: a. The minimum permanent pool volume is 30,000 cubic feet. b. The fountain must draw its water from less than 2' below the permanent pool surface. C. Separated units, where the nozzle, pump and intake are connected by tubing, may be used only if they draw water from the surface in the deepest part of the pond. d. The fountain may not be placed into the forebay. e. The falling water from the fountain must be centered in the main pond, away from the shoreline. f. The maximum horsepower for a fountain in this pond DA1 is 1/2 horsepower and pond DA2 is 1/6 horsepower. 9. 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. For changes to the project or SCM that impact the certifications, a new or updated certification(s), as applicable, will be required and a copy must be submitted to the appropriate DEQ regional office upon completion of the modification. a. Any modification to the approved plans and specifications, regardless of size including the SCM(s), BUA, details, etc. b. Redesign or addition to the approved amount of BUA or to the drainage area. c. Further development, subdivision, acquisition, lease or sale of any, all or part of the project and/or property area as reported in the approved plans and specifications. d. Altering, modifying, removing, relocating, redirecting, regrading, or resizing of any component of the approved SCM(s), the stormwater collection system and/or vegetative conveyance shown on the approved plan. e. The construction of any allocated future BUA. f. The construction of any permeable pavement, #57 stone area, public trails, or landscaping material to be considered a permeable surface that were not included in the approved plans and specifications. g. Other modifications as determined by the Director. 10. 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 constructed 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. 11. If the stormwater system was 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. 12. The stormwater management facility shall be located within a recorded drainage easement. Clear and unhindered access to all components of the stormwater management facilities for inspection and maintenance shall be maintained at all times. 13. 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. Page 3 of 5 Post Construction Stormwater Management Permit No. SW8110901 14. It is the responsibility of the permit holder, NGP VI Wilmington NC LLC, to notify DEMLR of any changes in ownership via the submittal of the completed and signed name/ownership change form. However, if the lease agreement or contract between NGP VI Wilmington NC LLC and the New Hanover County Airport Authority is dissolved, cancelled or defaults, and DEMLR is not notified by NGP VI Wilmington NC LLC to transfer the permit, then the responsibility for permit compliance reverts to the property owner. A complete transfer request must be submitted to the Division within 30 days as described below, otherwise the New Hanover County Airport Authority will be operating a stormwater treatment facility without a valid permit, which is a violation of NC General Statue 143-215.1. Failure to transfer the permit may result in appropriate enforcement action in accordance with North Carolina General Statute §143-215.6A through §143-215.6C being taken against the Property Owner. III. GENERAL CONDITIONS 1. CORRECTIVE ACTIONS REQUIRED. If 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. 2. PERMIT RENEWAL. 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). 3. CHANGES TO THE PROJECT NAME, PERMITTEE NAME OR CONTACT INFORMATION. The permittee shall submit a completed Permit Information Update Application Form to the Division within 30 days to making any one of these changes. 4. TRANSFER. This permit is not transferable to any person or entity except after notice to and approval by the Director. Neither the sale of the project and/or property, in whole or in part, nor the conveyance of common area to a third party constitutes an approved transfer of the permit. a. TRANSFER REQUEST. The transfer request must include the appropriate application, documentation and the processing fee as outlined in 15A NCAC 02H.1045(2). This request must be submitted within 90 days of the permit holder meeting one or more of the following: i. A natural person who is deceased, ii. A partnership, limited liability corporation, corporation, or any other business association that has been dissolved; iii. A person or entity who has been lawfully and finally divested of title to the property on which the permitted activity is occurring or will occur through foreclosure, bankruptcy, or other legal proceeding. iv. A person or entity who has sold the property, in whole or in part, on which the permitted activity is occurring or will occur, V. The assignment of declarant rights to another individual or entity; vi. The sale or conveyance of the common areas to a Homeowner's or Property Owner's Association, subject to the requirements of NCGS 143-214.7(c2); b. TRANSFER INSPECTION. 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 complies with the permit conditions. Records of maintenance activities performed to date may be requested. Projects not in compliance with the permit will not be transferred until all permit and/or general statute conditions are met. 5. COMPLIANCE. The permittee is responsible for compliance with the terms and conditions of this permit until the Division approves the transfer request. a. APPROVED PLANS AND SPECIFICATIONS. A copy of this permit, approved plans, application, supplement, operation and maintenance agreement, all applicable recorded documents, and specifications shall be maintained on file by the permittee at all times. Page 4 of 5 Post Construction Stormwater Management Permit No. SW8110901 b. DIVISION ACCESS. The permittee grants Division Staff permission to enter the property during normal business hours to inspect all components of the permitted project. c. ENFORCEMENT. 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. d. ANNUAL CERTIFICATION. The permittee shall electronically submit to the Division an annual certification completed by either the permittee or their designee confirming the projects conformance with permit conditions e. OBTAINING COMPLIANCE. 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. f. OTHER PERMITS. The issuance of this permit does not preclude the permittee from complying with and obtaining any other permits or approvals that are required 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. Permit renewed, updated, and reissued this the 1s' day of February 2023. NORTH CAROLIIN/A ENVIRONMENTAL MANAGEMENT COMMISSION 3 )7 ,al,Douglas R. Ansel, Interim Director Division of Energy, Mineral and Land Resources By Authority of the Environmental Management Commission Page 5 of 5 Attachment C-Permitting History Wilmington Veterans Administration Outpatient Clinic Permit No.SW8110901 Approval Permit Action BIMS Description of the Changes Modified Plan Sheets Date Version High Density Commercial Wet Detention Pond Project- construction,operation and maintenance of two(2)wet Original detention ponds in compliance with the provisions of 9/20/2011 Approval 1.0 15A NCAC 2H .1000 and Session Law 2008-21 I. The C-0-C-3.0,C-6.0-6.1 stormwater controls labeled DAI and DA2 have been designed to handle the runoff from 276,262 square feet and 146,745 square feet of built-upon area,respectively. Transfer-Name Change/Ownership Change-The 3/28/2019 Major 1.1 stormwater controls labeled DA 1 and DA2 have been Modification designed to handle the runoff from 276,262 square feet and 146,745 square feet of built-upon area, respectively. 2/l/2023 Renewal 2.0 New expiration date: September 20th,2029 Page 1 of 1 Pennit Number. (to be provided by DWQ) Drainage Area Number: Wet Detention 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. The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one): ❑ does ® does not incorporate a vegetated filter at the outlet. This system (check one): ❑ does ® does not incorporate pretreatment other than a forebay. Important maintenance procedures: — Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the basin should be watered twice weekly if needed, until the plants become established (commonly six weeks). — No portion of the wet detention pond should be fertilized after the first initial fertilization that is required to establish the plants on the vegetated shelf. — Stable groundcover should be maintained in the drainage area to reduce the sediment load to the wet detention basin. — If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain should be minimized to the maximum extent practical. — Once a year, a dam safety expert should inspect the embankment. After the wet detention pond is established, it should be inspected once a month 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 should be kept in a known set location and must 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 wet Areas of bare soil and/or Regrade the soil if necessary to detention 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. Vegetation is too short or too Maintain vegetation at a height of long, a roximately six inches. AYH/ Form SW401-Wet Detention Basin O&M-Rev.4 SEP U 7 2011 Paee I of 4 IW: Perot Number: (m be pi)vided by DWQ) Drainage Area Number. BMP element: Potentialproblem: How I will remediate theproblem: The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the Swale sediment off-site. The pipe is cracked or Replace the pipe. otherwise damaged. Erosion is occurring in the Regrade the swale if necessary to swale. smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. The forebay Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design depth for possible. Remove the sediment and sediment storage. dispose of it in a location where it will not cause impacts to streams or the BMP. Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used,wipe it on the plants rather than spraying. The vegetated shelf Best professional practices Prune according to best professional show that pruning is needed practices to maintain optimal plant health. Plants are dead, diseased or Determine the source of the dying. problem: soils, hydrology,disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used,wipe it on the plants rather than spraying. The main treatment area Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design sediment possible. Remove the sediment and storage depth. dispose of it in a location where it will not cause impacts to streams or the BMP. Algal growth covers over Consult a professional to remove 50% of the area. and control the algal growth. Cattails, phragmites or other Remove the plants by wiping them invasive plants cover 50"/ of with pesticide (do not spray). the basin surface. SEP 0 7 2011 Form SW401-Wet Detention Basin O&M-Rev.4 Page 2 of 4 tI Y. Permit Number: :56V t (to be provided by DWQ) Drainage Area Number: BMP element: Potentialproblem: How I will remediate theproblem: The embankment Shrubs have started to grow Remove shrubs immediately. on the embankment. Evidence of muskrat or Use traps to remove muskrats and beaver activity is present. consult a professional to remove beavers. A tree has started to grow on Consult a dam safety specialist to the embankment. remove the tree. An annual inspection by an Make all needed repairs. appropriate professional shows that the embankment needs repair. if applicable) The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site. The outlet device is damaged Repair or replace the outlet device. The receiving water Erosion or other signs of Contact the local NC Division of damage have occurred at the Water Quality Regional Office, or outlet. the 401 Oversight Unit at 919-733- 1786. The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 7 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 7 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) 17 Permanent Pool Elevation 24 Sediment Removal E . 17 Pe marten Pool Volume Sediment Removal Elevation 17 Volume Bottom Elevatio 16 -It Min. ----------------------------- ------------- ------ Sediment Bottom Elevation 16 1-ft n. Storage Sediment Storage FOREBAY MAIN POND Form SW401-Wet Detention Basin O&M-Rev.4 SEP U 7 2011 Page 3 of 4 BY: Permit Number: Sev B/roCfol (to be provided by DWQ) I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above. 1 agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name:Wilmington Veterans Adminstration Outpatient Clinic BMP drainage area number:I Print name:Robert D. Baker, Wilmington NC VA 2011 LLC Title:Managing Member Address:889 E. Johnson St. Fond du Lac WI 54935 Phone:920-924-2900 Signature,,�� _ / Date: 8• z s-/ I 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. I, Soav, ff. �,oev,r3 , a Notary Public for the State of W I County of 1=Cv,ol dw " c- , do hereby certify that _,V-Cbzr4- D, b%" personally appeared before me this 25 day of kcLa v. s,4- ao t I and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, L � • • E. KOE koTAR Y PUBLkG SEAL My commission expires RECEIVED, Form SW40I-Wet Detention Basin O&M-Rev.4 SEP 0 7 2011 Page 4 of 4 BY: . Permit Number: (10 be provided by DWQ) Drainage Area Number. 2.. Wet Detention 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. The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one): ❑ does ® does not incorporate a vegetated filter at the outlet. This system (check one): ❑ does ® does not incorporate pretreatment other than a forebay. Important maintenance procedures: — Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the basin should be watered twice weekly if needed, until the plants become established (commonly six weeks). — No portion of the wet detention pond should be fertilized after the first initial fertilization that is required to establish the plants on the vegetated shelf. — Stable groundcover should be maintained in the drainage area to reduce the sediment load to the wet detention basin. — If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain should be minimized to the maximum extent practical. — Once a year, a dam safety expert should inspect the embankment. After the wet detention pond is established, it should be inspected once a month 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 should be kept in a known set location and must 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 wet Areas of bare soil and/or Regrade the soil if necessary to detention 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. Vegetation is too short or too Maintain vegetation at a height of long. t -a rox_imately;six inches. Fornt SW401-Wet Detention Basin O&M-Rev.4 SEP 0 7 2011 page I Of 4 ram. PennitNumber: �����U� (to be provided by DWQ) Drainage Area Number. 2— BMP element: Potentialproblem: How I will remediate theproblem: The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the swale sediment off-site. The pipe is cracked or Replace the pipe. otherwise damaged. Erosion is occurring in the Regrade the swale if necessary to swale. smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. The forebay Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design depth for possible. Remove the sediment and sediment storage. dispose of it in a location where it will not cause impacts to streams or the BMP. Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used,wipe it on the 21ants rather than spraying. The vegetated shelf Best professional practices Prune according to best professional show that pruning is needed practices to maintain optimal plant health. Plants are dead, diseased or Determine the source of the dying. problem: soils, hydrology,disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. The main treatment area Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design sediment possible. Remove the sediment and storage depth. dispose of it in a location where it will not cause impacts to streams or the BMP. Algal growth covers over Consult a professional to remove 50% of the area. and control the algal growth. Cattails, phragmites or other Remove the plants by wiping them invasive plants cover 50% of with pesticide(do not spray). the basin surface. U 7 2011 Fonn SW401-Wet Detention Basin O&M-Rev.4 SEF Page 2 of 4 Permit Number: 5W (to be provided by DWQ) Drainage Area Number: l� BMP element: Potentialproblem: How I will remediate theproblem: The embankment Shrubs have started to grow Remove shrubs immediately. on the embankment. Evidence of muskrat or Use traps to remove muskrats and beaver activity is present. consult a professional to remove beavers. A tree has started to grow on Consult a dam safety specialist to the embankment. remove the tree. An annual inspection by an Make all needed repairs. appropriate professional shows that the embankment needs repair. if applicable) The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site. The outlet device is damaged Repair or replace the outlet device. The receiving water Erosion or other signs of Contact the local NC Division of damage have occurred at the Water Quality Regional Office, or outlet. the 401 Oversight Unit at 919-733- 1786. The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 8 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 8 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) 17 Permanent Pool Elevation 24 Sediment Removal E .F[6 � Pe maven Pool------------- Volume Sediment Removal Elevation 16 VolumeBottom L'leva[io Al Min. ------------ ---------- Sediment Bottom Elevation 15 1-I1 n. Storage Sediment Storage FOREBAY MAIN POND Form SW401-Wet Detention Basin O&M-Rev.4 SEP 0 7 2011 Page 3 of 4 Permit Number: 6 OFA ?01 (to be provided by DWQ) 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 Veterans Adminstration Outpatient Clinic BMP drainage area number:2 Print name:Robert D. Baker, Wilmington NC VA 2011 LLC Title:Managing Member Address:889 E. Johnson St Fond du Lac, WI 54935 Phone:920-924-2900 Signature: i�/ ✓ � r Date: t " 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. I, UOa ci V. a Notary Public for the State of vi i , County of end d,c I -ac_ do hereby certify that lob,+--t— D, �Le_t— personally appeared before me this 25 day of )-o i I , and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, �7r 6 �-F_ SEAL My commission expires I-11-t 5 Form SW401-Wet Detention Basin O&M-Rev.4 SEP 0 7 2011 Page 4 of 4 UEMLK U51m UNLY ' Date Received Fee Paid Permit Number Lp o0 01 NC DEQ Division of Energy, Mineral and Land Resources STATE STORMWATER: PERMIT RENEWAL APPLICATION FORM In accordance with 15A NCAC 2H.1045(3), the current permit holder shall renew their high density permit 180 days prior to its expiration. Renewed permits are valid for a period of 8 years per Session Law 2011-398 (SB 781) Section 60.(c). This application form is for permit renewals only. A. PROJECT INFORMATION 1. State Stormwater Permit Number: SW8 1 ]0901 2. Project name: Wilmington Veterans Administration Outpatient Clinic 3. Project street address: 1705 Gardner Drive City: Wilmington County: New Hanover ZIP : 28405 4. What, if any, changes have been made to the project as permitted? N/A If the project has changed from the original approved plans, please complete SWU-101 for a Major Modification or Minor Modification Application form available at: https://deg.nc.gov/about/divisions/energy- m ineral-land-resources/energy-mineral-land-rules/stormwater-program/post-construction. B. PERMITTEE INFORMATION If changes to the permittee or project name have been made, please complete either the Permit Update form or the Permit Transfer form available at: https://deg.nc.gov/about/divisions/energy-mineral-land- resources/energy-mineral-land-rules/stormwater-program/post-construction. State Stormwater Permits do not automatically transfer with the sale of the property. 1. Current Permit Holder's Company Name/Organization: NGP VI Wilmington NC LLC 2. Signing Official's Name: David Kent 3. Signing Official's Title: Manager 4. Mailing Address: 1650 Tysons Blvd, Suite 1500 City: McLean State: VA ZIP : 22102 5. Street Address: 1650 Tysons Blvd, Suite 1500 City: McLean State: VA ZIP : 22102 6. Phone: (703) 760-9217 Email: dk(a)ngpv.com r CEIVE AN 2 7 2023 BY: Stormwater Permit Renewal Form Page 1 of 3 May 11,2018 D. PERMITTEE'S CERTIFICATION I, pk,-, ( Keh f the person legally responsible for the permit, certify that I have a copy of the Permit and O&M Agreement on site (or I will obtain a copy and it will be kept on site), that I am responsible for the performance of the maintenance procedures, and the site has been and will be maintained according to the O&M Agreement and approved plans. I agree to notify DEMLR of any problems with the SCMs or built-upon area and to submit the proper forms to modify or transfer the permit prior to any changes to the project, SCMs, or ownershi All information provided on this permit renewal application is, to the best of my knowledge, correct and Signature: Date: 7 NOTARI TION: /� d''\\Oe M,r 1 \ �" , a Notary Public for the State of V \Cf�1n\C1� County of �\SSC do hereby certify that I M\4 personally appeared before me this the }b- day of �SOAW_cu 20011_� and acknowledge the due execution of the forgoing instrument. Witness my hand and official seal, (Notary Seal) OZ�•' NOTgRy �� PUBLIC r REG#7644199 r Notary Signature: o My COMMISSION: ni1 n`1 2� •. 01/31/2024 My commission ex iresLT O d l �• ; gOF�,Q�,: Slormwaler Permit Renewal Application Form Page 3 of 3 May 11,2018 Permit No.Jwa //0 `O/ (to be pm ded 0y DINO) > NC EHR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 15 401 CERTIFICATION APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form must be figad out,printed and submitted. The Required Items Checklist(Part Ill)must be printed,filled out and submitted akvlp with all W the required information. Ned name WiknirpWli VAOulpakent Clink Contact person '`. - • ,Tim C6nkEdales-PE f Phone number 91Q791.6707 Date 6115R011 r Drainage area number U: DESIGNINFORMATIONF`.f'E"Jfw:sue"v`1'-"'i��?.^°is3kZ�"�s„1•a.4� ',"`v:�`.g.;<'?.` <"+9":'�`�" .�•:'Y'+x4S _ m.•�n'C�",.n.tT.r.�S.?!R.:�•aai"k::.a�';��""'_3�rai, w She Characteristics Drainage area 7e0.4 fl,T Impervious area,post-development 276.262 f %impervious 72.61 % Design rainfall depth .0.5 in Storage Volume: Non•SAWaters Minimum volume required 33.496 111 OK I Volume provided J8,815 fl OK,volume provided is equal to or In excess of volume required. Storage Volume: SA Wabrs _ 1.5'rulalf volume ...ft Pre-development 1-yr.24-hrrurofl Post-0evelopment 1-Yr.24.1v muff Minimum volume required fl Volume provided u Peak Flow Calculations -,- Is the prelpost control of the 1yr 24hr storm peak flow required? n .,!i+:;:.:(Y or N) 1-yr,24-hr rainfall depth _ in Rational C.prede telopmend :r o(witless) Rational C,post-development - is'';'•..i(Unitless) Rainfall intensity.1-yr.24-hr storm i- l inthr Pro-development 1-yr,24-hr peak flow flllsec Post-development 1-yr,24-hr peak flow felsee PrelPost 1-yr.24-hr peak flow control f?kw Elevations Temporary pool elevation ';`,25.00:hnsl Permanent pool on(approx. ' '24.00 fiml RECEIVED SHWT aevation(apprmt.at the perm pod deraUon) .,23.00�hful Top d 10ft vegetated shelf elevation .24.50 Intel Bottom of iOft vegetated shelf elevation Sediment deanoul,top elevation(bottern of pond) 16.00'..hmsl Sediment deanou611oOmn elevation 11,.15.00.fmd SEP 19 2011 Sediment storage provided 1.00 fl Is Owe additional volume stored above thester"uhed temp.pool? i• '�' rY.-•;;t` DWQ - (Y«N) - PROD# EWation of the top of the additional volume '+ri`Z 25.0 find OK Form WMI-Wet Detention Basin.Rev.869117109 PW I,a II.D"Ign Summery,Page i of 2 Permit NoSW V 1 tUqf y1 (to be Amvided by DW0) Ili:DESIGN INFORMATIONi�.� .u=: "ow^. >"e.':�#�" 'fitTr.' :z'4°-0«mc`w. ig:✓b'-`W..' s`.N'u:itt ""� •'`t�'° ',.: r.+.�'i:``.-,�tiatn'iis-l-: Surface Areas Area,temporary pool .'s:i•.;41,778 fe Area REWIRED,permanent pool 17.813 f r SAIDA ratio - ;.'4:68(uniaess) Area PROVIDED.permanent pod,Ar.,, ,35,854,fl OK Area,bottom of 1011 vegetated shelf,Ammer 32,500,ft2 Area,sediment dearout,lop elevation(bottom of pond),Aw.r,,,r :11,277'ft Volumes Volume.temporary pod ,... 's.:38,815'fls OK Volume,Permanent pool,Vr _pw -:176,253 R Volume,forebay(sum of forebays if move than one forebay) ''136,863.ft Forebay%of permanent pod volume 21.7%% OK SAIDA Table Dab Design TSS removal s `go% Coastal SAIDA Table Used? ;Yf..'.;(Y or N) . MourdalnlPiedmont SAIDA Table Used? Ni-' -: :(Y or N) SAIDA ratio 4.68(udtiess) Average depth(used in SAIDA table): _ Calculation option l used?(Sea Figure 10-2b) N �•... �!(Y w N) Volume,permanent pool,Vr.,n.w,e 170,253 fV Area provided,permanent pod,Aw. jw 35,854 R Average depth calculated - 'R Need 3flmin, Average depth used in SAIDA,d,,.,(Rand to nearest 0.5ft) i R Calculation option 2 used?(Sea Figure 10-2b) '..,y--"",(Y or N) Area provided,permanent pool,Ar jw 35,854 fl Area,bottom of tOR vegetated shelf,Ab," 32,500 fl Area,sediment deanout,top elevation(bottom of pond),A Lp � 11,277 R2 'Depth'(distance bhv bottom of 10111 shelf and top of sediment) 7.50 it Average depth calculated _ '5.53 ft OK Average depth used in SAIDA.d.,(Round to nearest 0.5ft) 5.5'R OK Drawdown Calculations Drewdown through orifice? _ ._,` Y.. '(Y pr N) RECEIVED Diameter of orifice(If circular) .: 3.00 in Area of orifice iRondmulaQ �, ,,' ' 0.6 C 0( ) SEP 19 2011Coefficient of (CD) Driving head(NJ '.• r; 9�i 0.33 ft ow Orawdn through weir? •s:i;:'Ni 'Sl(Yor N) DWQ Wairtype "' (unItless) PROJ# Coefficient of discharge(C.) . : i(unitless) Length ofweir(L) ft Driving head(H) -. ':1:e-:,,, It Pre-development 1-yr,244Y peak flow 7 iJe'fl Isec Post-development l-yr,24-hr peak Row �iYo'ftslsec Storage volume dLsdlarge rate(through discharge orifice or weir) 0.14!flslsec days Or,draws down in 2-5 days. Storage volume drawdown time Additional Information _ Vegetated side slopes . 3.:1 OK Vegetated shelfsbpe •r . '10':1 OK Vegeteedshelfwidth is=�.'Jt.•, ,10.0.R OK Length of Ruwpelh to width ratio 31:1 OK Length to width ratio - :t'�.," a .'3.0:1 OK Tre6n Wk for Ovemew&onfloe7 ::.'..Y-:.'::: (Y or N) OK Freeboard provided :[S==•_rs",!,1.81 OK Vegetated fitter provided? N:�R;d1I(Yor N) OK Recorded drainage easement provided? OK Capures all runoff at ultimate build-out? !;3'kY ..7 Drain rtlxhanisrrl for maintenance or emergencies is: Pang Oul Form SWe01.WN DoW don Bash-Rev.8-9117a79 Parts 1.6 n.Design SWvnmy.Pepe 2 of 2 Permit No.:5w F/10 Ct C-1/ (h,ba provided by DWQ) oFVvAr f;9 JA Aga WDENK. STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form must be rifled out,pikifed end submitted. The Required Items Checklist(Pad 111)must be printed,filled out and submuffed a"will)all Of the required inbinallori. Project name .Wdo1dngbANi;LxupaoemQinice 7 Contact person Phone number 9107791-6707', Date Drainage area number 2lp Site Characteristics Drainage area 243,036 fl? Impervious area,post-development 146,745 f? %impervious 60.16% Design rainfall depth Storage Volume: Non-SA Waters Minknum volume required OK Volume provided 18 039,ft' 1 OK,volurne provided is equal to or In excess of volume required. Storage Volume: SAWaters 1.5'runoff volume ;R, Pf"evelopment 1-yr,24-hr runoff fe Post-developmert 1-yr,24-hrrunoff iff, Minlaw volume required ft Volume prinrWed r. fi? Peak Flow Calculations Is the prelpost control of the lyr 24hr storm peak low required? -'(Y or N) I-yr,24-1r rainfall depth Rational C.pro-development (unidess) Rational C.post-developmert ;(Unwess) Rainfall Intensity:i-r,24-hr storm Pre-development 1-yr,24-hr peak flow flelse; Post-daveltipment 1-yr,244ir peak flow R31sec PrerPost 1-yr.24-hr peak Ow=did felseo RECEIVED Elevations Temporary peel elevation 7 25.05 final Permanent pool elevation 0 24.00 host SHWr elevation(approx.at the perm.pool elevation) ",23.00 final SEP 19 2011 Top of 1 OR vegetated shelf elevation .-24.50 fod Bottom 1011vegetated shelf elevation 23.50 final DWQ Seffirivant cleanout,by elevation(bottom of pond) 1 17.DO Ims! PROD# Sediment cleanout,bottom elevation 5 16.00ifund Sediment storage Provided 1.004 Is them addakird volume stored above the state-required temp.pool? Y; ri,(Y or N) Elevation of ft top of the addifional volume Vs! 1 final OK Form SW401-WM Detention Sasln-PevA-9111W P"I.a 11.Desian Swwnary,Per 1 of 2 Permit No. JW ;F/to L 0 I (m ee Provided eY0VVQ) N[,,DESIGNINFORMATIONV's-,z+ - "i,. .>.hi1F �'.'> .�a-"-°s, l -n".' t ` �,. `°":i'�'� ;?': =si: �' w'-^;:rs 5, "•3 'v, '>FnTaz Surface Areas Area.temporary pod Area REQUIRED,permanent pod 11,709 W SAIDA ratio - 4.80(unitless) Area PROVIDED,permanent pod,Ate_" 15,224,f? OK Area,boftorn of 1011 vegetated shelf,A,." ,13,110 fl Area,sediment dears d,top elevation(bottom of pond).Aeayme .{)..`:' 2,682 0` Volumes Volume,temporary pod 18,639 ft OK Volume,pememenl pool,V,se,y o 51,992,fe Volume.forehay(sun of forebays if more than one forebay) ..11;417 fte Forebay%of Permanent pod volume 22.0%% OK SAIDA Table Data Design TSS removal 90.% Coastal SAIDA Table Used? ' . Y (Y or N) Mo dijoiPiedmorll SAIDA Table Used? W' _ (Y or N) SAIDA retlo 4.80(uni less) Average depth(used in SAIDA table): _ Calalabon option 1 used?(See Figure 10.2b) -N ,:,,'(Y or N) Volume,permanent pod,Va,,,,,pw 51,992 It' Area Provided,permanent pod,A..w 15,224 W Average depth calculated _ fl Need 3 ft min. Average depth used in SAIDA,dam,(Round to nearest 0.511) _ ft Caku lation option 2 used?(See Figure 10-2b) ' Y:,. "'(Y or N) Area provided,permanent pool,A._. 15,224 li Area,bottom of 10ft vegetated shelf,Ab L„a 13,110 ff Area,sed'uoem danoul,lop elevation(bottom of Pond).Aw_P„e 2,682 1? 'Depth'(distance bAv bottom of 1011 shelf and top of sediment) 6.50 If Average depth calculated 4.38 It OK Average depth used'In SAIDA.d,..(Round to nearest 0.511) 4.5;fl OK osin Calc Draw mete of RECEIVED Draadown through orifice? Y ` (Y or N) Diameter of orifice(if cirodar) i 2.00 in Area of orifice(if-noniarcdar) Coefficient of discharge(CO) (unNess) Driving head(NJ �: :`?: ..�.0.35e SEP 19 2011 Drawdown through weiR t t-;W..71'i+1(Yor N) Weir 7De i:!(udtless) DVVQ Coefficient of discharge(C.) ''t(udtless) PROJ# Length of weir(L) Driving head(H) "`- i1B Pre-development l-yr,24-hrpakllow Post-developmerd 1-yr,24-hr peak Bow `�',: NEi..fl Isec Storage volume discharge rate(through discharge orifice or weir) <-0,1)6;elm '. 3 OK,drawn down in 25 days. Storage volume dmwdown time m, Additional Information Vegetated side slopes t '3:1 OK Vegetated shelf slope 10':1 OK Vegetated shelf width t'.��.._�"..A10.0-a OK Length of flawpath to width ratio �1:1 OK Length to width MW r 10.:1 OK Trash rack for ovemow a orifice? Y m:;(Y m N) OK Freeboard provided I,;;;.:T:,z;'.-i,1'.B!ft OK Vegetated filter provided? �:'>4i�E<N,->'t4,: i?(Y a N) OK Recorded drainage easement Provided? _4J,i4%Y i,'_�.^,l(Y or N) OK Capures all nnoft at NWnate buildoul? gL Yell ;i(Y o_r N) OK Drain In Khamsm for maintenance or emergencies is: Pump ON £�'�;t ' i-.:.x.,e:)I.�a t+�f `i.'f SE3�3t y:.r r '?# •v' r✓a '.a, . Farm SW401-Wet Detention 9a.Rev.9.9I17109 Paris I,a II.Design Summary,Pane 2 of 2 u 09-20-'11 13:03 FROM-DENR Wilmington 910-350-2004 T-874 P00081WO09 F-225 State Stormwater Management Systems Permit No. SW8 110901 Wilmington VA Outpatient Clinic Stormwater Permit No. SW8 110901 New Hanover Countv Designer's Certification st I, '� � -") , in the State of North Carolina, having been authorized to obsery (periodically/ eekly/full time) the construction of the project, V,Inr�� 4M VA y/.¢1,,/,� f- (Project) for a'lMI^)An a V4- (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 specifications: CARO��.,w O yr,7 5 AZ ; y`_ =S 1aL 02Fz 347 J r u (� Signature Registration Number �i�L¢ `""•LLII,II,.I.. °" Date Page 7 of 8 09-20-'ll 13:03 FROl1-IIEIIR Wilmington 910-350-2004 T-874 P0009/0009 F-225 State Stormwater Management Systems Permit No, SW8 110901 Certification Requirements: �1. The drainage area to the system contains approximately the permitted acreage. L/'�'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 outlet stricture elevations are per the approved plan. 6. The outlet structure is located per the approved plans. //7. Trash rack is provided on the outlet structure. ✓ 8. All slopes are grassed with permanent vegetation. v/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. �jt. The permitted amounts of surface area and/or volume have been provided. 12. Required drawdown devices are correctly sized and located per the approved plans. 13. All required design depths are provided. '/ 14. All required parts of the system are provjded, such a a vegetated hell, an�}� r� forebayr .d•4 pr�7,� k-e-ee .fF 11w yw sr6/s�G -A �15. The required system dimensions are provided per the approved plans. . 6. All components of the Stormwater BMP are located in either recorded common areas, or recorded easements. cc: NCDENR-DWQ Regional Office New Hanover County Building Inspections Page 8 of 8