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Home My WebLink AboutSW8030620_HISTORICAL FILE_20040319STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW,�J��j�( DOC TYPE El CURRENT PERMIT ❑ APPROVED PLANS Ke-PHISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE YYYYMMDD TRIPP ENGINEERING, P.C. 41 419 OWStnut Sticct Wilmington, North Caioliiia 28401 Phone (910) 763-5100 • FAX (910) 763-5631 March 16, 2004 { NCDENR Division Water Quality 127 Cardinal Drive Wilmington, NC 28405-3845 Attn: Ms. Linda Lewis Re: Tidewater Storage SW8 030620 New Hanover County, NC TE 01139 Dear Linda We are writing to request a modification to existing permit no SW8 030620 for the above referenced project Enclosed please find modified site plan, permit application with narrative, trench drain calculations and check for the application fee Please note the site plan has changed from four buildings to three The total impervious surface has decreased from 45,978 sf to 45,757 sf We have modified the infiltration trench system, but maintain a storage volume that exceeds the State's requirement for 2" of rainfall Please review for approval and contact us with any questions, comments or if you need additional information Thank you Sincerely, Tripp Engineering, P.C. /;�, 0 . Michael Hoffer 18Tl: W414 Enc N1tiN 9 Y '0Q4 W P 1 * * * COMMUNICATION RESULT REPORT ( MAR 11 2004 8 33AM ) * * * TTI NCDENR WIRO FILE MODE OPTION ADDRESS (GROUP) RESULT PAGE ------------------------------------------------------------------------------------------------------ 888 MEMORY TX 9-7635631 QK P 1/1 REASON FOR ERROR E-1) HANG UP OR LINE FAIL E-3) NO ANSWER E-2) BUSY E-4) NO FACSIMILE CONNECTION *A% Michael F Easley, Governor Q William G Rorer Jr. Secretary ANorth Carolina Department of Environment and Natural Resources .y Alan W 101mek, P E ,Director p Division of Water Quality Coleen H Sullins, Deputy Director Onnsion of Water Quality FAX COVER SHEET Date: March 11, 2004 No. of Pages: 1 To: Mike Hoffer Frain: Lallift-Munn Company: Tripp Engineering, P.C. Water Quality Section - Stormwater FAX #: 910-763,5631 FAX # 910.350.2004 Phone # 910-395.3900 DWQ Stormwater Project Number: SW8 030620 Project Name: Tidewater Storage MESSAGE: Mike, Upon review of your request for a plan revision for Tidewater Storage, it has been determined that the submitted changes will require a permit modification. Anytime that the system parameters change requiring a new permit to be issued, a modification is required. Please submit a formal modification including the $420 application fee to Linda Lewis for review of the project. Please feel free to call me with any questions Michael F Easley, Governor William G Ross Jr, Secretary North Carolina Department of Environment and Natural Resources FAX COVER SHEET Date. March 11, 2004 No. of Pages: 1 To Mike Hoffer From. Laurie Munn Company- Tripp Engineering, P C Water Quality Section FAX #: 910-763-5631 FAX # 910-350-2004 Phone # 910-395-3900 DWQ Stormwater Project Number: SW8 030620 Project Name: Tidewater Storage MESSAGE. Mike, Alan W Klimek, P E ,Director Division of Water Quality Coleen H Sullins, Deputy Director Division of Water Quality - Stormwater Upon review of your request for a plan revision for Tidewater Storage, it has been determined that the submitted changes will require a permit modification Anytime that the system parameters change requiring a new permit to be Issued, a modification is required Please submit a formal modification including the $420 application fee to Linda Lewis for review of the project Please feel free to call me with any questions SIWQSISTORMWATIADDINFO\20041030620 mar04 N C Division of Water Quality 127 Cardinal Drive Extension (910) 395-3900 Customer Service Wilmington Regional office Wilmington, NC 28405 (910) 350-2004 Fax 1 800 623-7748 Michael F Easley, Govemor William G Ross Jr, Secretary North Carolina Department of Environment and Natural Resources FAX COVER SHEET Date: March 11, 2004 No. of Pages 1 To: Mike Hoffer From: Laurie Munn Company- Tripp Engineering, P C Water Quality Section FAX #- 910-763-5631 FAX # 910-350-2004 Phone # 910-395-3900 DWQ Stormwater Project Number. SW8 030620 Project Name- Tidewater Storage MESSAGE - Mike, Alan W Klimek, P E ,Director Division of Water Quality Coleen H Sullins Deputy Director Division of Water Quality - Stormwater Upon review of your request for a plan revision for Tidewater Storage, it has been determined that the submitted changes will require a permit modification Anytime that the system parameters change requiring a new permit to be issued, a modification is required Please submit a formal modification including the $420 application fee to Linda Lewis for review of the protect Please feel free to call me with any questions S1WQSISTORMWATIADDINF0120041030620 mar04 N C Division of Water Quality 127 Cardinal Drive Extension (910) 395-3900 Wilmington Regional Office Wilmington, INC 28405 (910) 350-2004 Fax Customer Service 1 800 623-7748 >Ww TRIPP ENGINEERING, P.C. 419 Chestnut Stiect Wilmington, North Caiohna 28401 Phone (910) 763-5100 • FAX (910) 763-5631 February 27, 2004 NCDENR Division Water Quality 127 Cardinal Drive Wilmington, NC 28405-3845 Attn: Ms. Laurie Munn Re: Tidewater Storage SW8 030620 New Hanover County, NC TE 01139 Dear Laurie MR 2 Zfl44 Enclosed please find modified site plan, permit application data, trench dram calculations and narrative for the above referenced project Please note the site plan has changed from four buildings to three The total impervious surface has decreased from 45,978 sf to 45,757 sf We have modified the infiltration trench system, but maintain a storage volume that exceeds the State's requirement for 2" of rainfall Please review for approval and contact us with any questions, comments or if you need additional information Thank you Sincerely, Tripp Engineering, P.C. A /�� Michael Hoffer MBH deb Eric February 26, 2004 Stormwater Narrative Tidewater Storage New Hanover County, NC TE 01139 Tidewater Storage is an existing 1 31-acre tract at 410 Cando Street A storage facility with 23,100 sf of buildings, 22,527 sf of asphalt access and 130 sf of concrete sidewalk are proposed Runoff from the total site, with an impervious area of 79% (1 05 acre), is to be treated by underground infiltration with no overflow No overflow is proposed, but the existing site drains to Smith Creek, classification C-SW r 28 04 02:18p Phillip Tripp 910-763-5631 p,1 TR.IPP ENGINEERING, P.C. 419 Chestnut Street Wilmington, North Carolina 28401 Phone (910) 763-5100 0 1FkX (910) 763-5631 January 28, 2004 NCDENR Division Water Quality 127 Cardinal Drive Wilmington, NC 28405-3845 Attn• Ms. Laurie Munn Re- Tidewater Storage SW8 030620 New Hanover County, NC TE 01139 Dear Laurie In response to your fax for the above referenced project, we offer the following 1 Revised calculations are provided 2 A revised supplement is enclosed Please review for approval and contact us with any questions, comments or if you need additional information Thank you Sincerely, Tripp Engineering, P.0 r Charles D. Cazier, E.I. CDC dcb Enc Jan 28 04 02:1Bp Phillip Tripp 910-763-5631 p - 3 1 /2812004 CDC WATERSHED DATA Total Drainage Area Sq ft I es S8,370 1 14 Tidewater Storage Inflltration Trench 10-year Storm Impervious Area Land Use Sq ft acres buildings 21 575 050 parking/asphalt 25,215 058 concrete 88 000 grassed parking 0 000 Total 46,878 108 INFILTRATION SYSTEM Rv-- 0 78 m✓in Design Rainfall= 2 96 impervious = 0 803 = 80 3% say_81 0% CPRE= 025 CPOST = (% imp )( 95)+(1-% imp )( 25) M 082 12 = 5 06 inMr 110 = 6 30 Inlhr 125 e 7 13 m1hr Volume of two inches and of runoff = (Desrgn rainfog)(Rv)(Dramage Area) V= 7,578 37 cu-ft Size on) Length (R) Volume Prpe provided L'(TrP= 8 375 Vp = 754 91 cu-ft 12 795 Total Volume provided (((L"W fl j-Vp)0 40)+Vp Area (so Elevation(ft) Vt = 10,052 95 cu-ft 8ottom 12000 303 Flood 12000 323 DRAWDOWN RATE RATE OF INFILTRATION 48 INIHR DEPTH OF BASIN 24 IN DRAW DOWN RATE 0 5 HRS 01139 TRIPP ENGINEERING, P.C. 419 Chestnut Street Wilmington, North Carolina 28401 Phone (910) 763-5100 • FAX (910) 763-5631 January 28, 2004 NCDENR Division Water Quality 127 Cardinal Drive Wilmington, NC 28405-3845 Attn. Ms. Laurie Munn Re: Tidewater Storage SW8 030620 New Hanover County, NC TE 01139 Dear Laurie In response to your fax, for the above referenced project, we offer the following l Revised calculations are provided 2 A revised supplement is enclosed Please review for approval and contact us with any questions, comments or if you need additional information Thank you Sincerely, Tripp Engineering, P.C. i J d Charles D. Camer, E.I. , r AN 2 9 20�4 CDC dcb Enc Trench Dimensions Height Width 2 ft 15 ft III. REQUIRED ITEMS CHECKLIST Length Volume Provided 800 ft 10,_0.52 95 cu ft The following checklist outlines design requirements per the Stormwater Best Management Practices manual (N C Department of Environment, Health and Natural Resources, November 1995) and Administrative Code Section 15 A NCAC 2H 1008 Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached If the applicant has designated an agent in the Stormwater Management Permit Application Form, the agent may initial below Attach justification if a requirement has not been met Applicants Initials CDL a System is located 50 feet from class SA waters and 30 feet from other surface waters 1� b System is located at least 100 feet from water supply wells C c Bottom of system is at least 2 feet above the seasonal high water table d Bottom of the system is 3 feet above any bedrock or impervious soil horizon NA e Off-line system, runoff is excess of the design volume bypasses the system (bypass detail provided) f System is designed to draw down the design storage volume to the proposed bottom elevation under seasonal high water conditions within five days based upon infiltration through the bottom only (a hydrogeologic evaluation may be required) g Soils have a minimum hydraulic conductivity of 0 52 inches per hour [X- h System is not sites on or in fill material or DWQ approval has been obtained CiS�- i Plans ensure that the installed system will meet design specifications (constructed or restored) upon initial operation once the project is complete and the entire drainage area is stabilized G� J System is sized to take into account the runoff at the ultimate built -out potential from all surfaces draining to the system, including any off -site drainage k System is located in a recorded drainage easement for the purposes of operation and maintenance and has recorded access easements to the nearest public right-of-way 1 System captures and infiltrates the runoff from the first 10 inch of rainfall (1 5 inch event for areas draining to SA waters) c- m Drainage area for the device is less than 5 acres �DC, n A pretreatment device ( filter strip, grassed swale, sediment trap, etc ) is provided o Trench bottom is covered with a layer of clean sand to an average depth of 4 inches rry p Sides of infiltration trench are lined with geotextile fabric �[ _ q Rock used is free of fines (washed stone) and has large void ratio r Side to bottom ratio is less than 4 1 S WU-107 Rev 3 99 Page 2 of 4 1/28/2004 CDC WATERSHED DATA Total Drain a Area sq ft acres 58,370 134 Tidewater Storage Infiltration Trench 10-year Storm Impervious Area Land Use sq ft acres buildings 21,575 050 arkm las halt 25,215 058 concrete 88 000 rasedparkino 0 000 Total 46,878 1 08 INFILTRATION SYSTEM Rv= 0 78 in/in Design Rainfall= 2 % impervious = 0 803 = 80 3% say 81 0% CPRE = 025 CPOST = (% imp)(95)+(1-% imp)(25) - 082 12 = 5 06 inlhr 110 = 6 30 inlhr 125 = 7 13 Inlhr Volume of two inches and of runoff = (Design rainfall) (Rv) (Drainage Area) V= 7,578 37 cu-ft Size (in) Length (ft) Volume Pipe provided L`(irr� 8 375 VP = 754 91 cu-ft 12 795 Total Volume provided (((L"W D")-Vp)0 40)+Vp Area (so Elevafton(ft) Vt = 10,052 95 cu-ft Bottom 12000 303 Flood 12000 323 DRAWDOWN RATE RATE OF INFILTRATION 48 INIHR DEPTH OF BASIN 24 IN DRAW DOWN RATE 05 HRS ,`o` t0AROI%''%,, p4 Y,9 oc�ES Slily, SEAL 9r: ` 17374 =cL 01139 ,1 t 1 /28/2004 CDC WATERSHED DATA Total Drainage Area 54 ft I acres 58,370 1 1 34 Tidewater Storage Infiltration Trench 10-year Storm Impervious Area Land Use sq ft acres huildin s 21,575 050 arkin !as halt 25,215 0 58 concrete 88 000 ,grassed parking 0 000 Total 46,678 1 08 INFILTRATION SYSTEM Rv= 0 78 intin Design Rainfall= 2 % impervious = 0 803 = 80 3% say 81 0% CPRF = 025 CPOST = (% imp)( 95)+(1-% imp )( 25) 082 12 = 5 06 iNhr 110 = 6 30 inlhr 125 = 7 13 inlhr Volume of two inches and of runoff = (Design rainfall) (Rv) (Drainage Area) V= 7,578 37 cu-ft Size (in) Length (ft) Volume Pipe provided L"(Trr') 8 375 VP = 754 91 cu-ft 12 795 Total Volume provided (((L'W D')-Vp)0 40)+Vp Area (sO Elevation(R) Vt = 10,052 95 cu-ft Bottom 12000 303 Flood 12000 323 DRAWDOWN RATE RATE OF INFILTRATION 48 INlHR DEPTH OF BASIN 24 IN DRAW DOWN RATE 0 5 HRS 01139 ` \`,��r�►1 GAtR r1of�, r .,�� (1[/Vg.�� SSlO ;qo SEAT. , .�,�. 17374 a •a %��/GR E G I "` !!�` rd111111 I �& ad. State Stormwater Management Systems Permit No SW8 030620 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY 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 Mr Tom Eakes Tidewater Storage New Hanover County FOR THE construction, operation and maintenance of an infiltration trench in compliance with the provisions of 15A NCAC 2H 1000 (hereafter referred to as 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 of Water Quality and considered a part of this permit This pen -nit shall be effective from the date of issuance until January 28, 2014, 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 on page 3 of this permit, the Project Data Sheet The stormwater control has been designed to handle the runoff from 45,978 square feet of impervious area This system must be operated with a vegetated filter 3 The tract will be limited to the amount of built -upon area indicated on page 3 of this permit, and per approved plans 4 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 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 A permit modification must be submitted and approved pnor to the construction of additional built -upon area from outside of the approved drainage area 2 A State Stormwater Management Systems Permit No SW8 030620 Project Name Permit Number Location Applicant Mailing Address DIVISION OF WATER QUALITY PROJECT DESIGN DATA SHEET Application Date Receiving Stream/River Basin Stream Index Number Classification of Water Body Drainage Area, acres Onsite, sq ft Offsite, sq fI Total Impervious Surfaces, sq ft Trench Dimensions, LxWxH, feet Piping (8" perforated piping) Piping (12" perforated piping) Trench Bottom Elevation, FMSL Permitted Storage Volume, f13 Temporary Storage Elevation, FMSL Type of Soil Expected Infiltration Rate SHWT Elevation, FMSL Time to draw down Tidewater Storage SW8 030620 New Hanover County Mr Tom Eakes P O Box 3373 Wilmington, NC 28405 January 28, 2004 Smith Creek / Cape pear 18-74-63 "C Sw" 131 58,370 none 45,978 800x 15x2 375 linear feet 795 linear feet 303 10,053 323 Baymeade (fine sandy loam) 48 0 m/hr 283 < 1 hour 3 State Stormwater Management Systems Permit No SW8 030620 II. SCHEDULE OF COMPLIANCE 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 The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited to a Semiannual scheduled inspections (every 6 months) b Sediment removal c Mowing and revegetation of slopes and the vegetated filter d Immediate repair of eroded areas e Maintenance of all slopes in accordance with approved plans and specifications f Debris removal and unclogging of outlet structure, onfice device, flow spreader, catch basins and piping g Access to the outlet structure must be available at all times 4 Records of maintenance activities must be kept and made available upon request to authorized personnel of DWQ The records will indicate the date, activity, name of person performing the work and what actions were taken 5 The facilities shall be constructed as shown on the approved plans This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data 6 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 7 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 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 Project name change c Transfer of ownership d Redesign or addition to the approved amount of built -upon area or to the drainage area e Further subdivision, acquisition, or sale of all or part of the project area The project area is defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan approval or a CAMA Major permit was sought f Filling in, altering, or piping of any vegetative conveyance shown on the approved plan 4 State Stormwater Management Systems Permit No SW8 030620 9 The permittee shall submit final site layout and grading plans for any permitted future areas shown on the approved plans, prior to construction If the proposed BUA exceeds the amount permitted under this permit, a modification to the permit must be submitted and approved prior to construction 10 A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of ten years from the date of the completion of construction 11 At least 30 days prior to the sale or lease of any portion of the property, the permittee shall notify DWQ and provide the name, mailing address and phone number of the purchaser or leasee An access/maintenance easement to the stormwater facilities shall be granted in favor of the permittee if access to the stormwater facilities will be restricted by the sale or lease of any portion of the property 12 The permittee must maintain compliance with the proposed built -upon area and ensure that the runoff from all the built -upon is directed into the permitted system 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 14 The permittee must maintain the current permitted drainage area No additional runoff from outside of the permitted drainage area boundary may enter the permitted stormwater facilities without first applying for and receiving a permit modification III. GENERAL CONDITIONS This permit is not transferable except after notice to and approval by the Director In the event of a change of ownership, or a name change, the permittee must submit a formal permit transfer request to the Division of Water Quality, accompanied by a completed name/ownership change form, documentation from the parties involved, and other supporting materials as may be appropriate The approval of this request will be considered on its merits and may or may not be approved The permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer request 2 Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement action by the Division of Water Quality, in accordance with North Carolina General Statute 143-215 6A to 143-215 6C 3 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) which have jurisdiction 4 In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, 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 5 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 6 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 State Stormwater Management Systems Permit No SW8 030620 7 Unless specified elsewhere, permanent seeding requirements for the stormwater control must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual 8 Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit 9 The permittee shall notify the Division any name, ownership or mailing address changes within 30 days Permit issued this the 28th day of January 2004 NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION ,may, Alan W Klimek, P E , Director Division of Water Quality By Authority of the Environmental Management Commission In State Stormwater Management Systems Permit No SW8 030620 Tidewater Storage Stormwater Permit No SW8 030620 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 7 State Stormwater Management Systems Permit No SW8 030620 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 The outlet/bypass structure elevations are per the approved plan 5 The outlet structure is located per the approved plans 6 Trash rack is provided on the outict/bypass structure 7 All slopes are grassed with permanent vegetation 8 Vegetated slopes are no steeper than 3 1 9 The inlets are located per the approved plans and do not cause short-circuiting of the system 10 The permitted amounts of surface area and/or volume have been provided 11 Required drawdown devices are correctly sized per the approved plans 12 All required design depths are provided 13 All required parts of the system are provided, such as a vegetated shelf, and a forebay 14 The overall dimensions of the system, as shown on the approved plans, are provided cc NCDENR-DWQ Regional Office New Hanover County Building Inspections TRIPP ENGINEERING, P.C. 419 Chestnut Street Wilmington, North Carolina 28401 Phone (910) 763-5100 • FAX (910) 763-5631 October 15, 2003 NCDENR Division Water Quality 127 Cardinal Drive Wilmington, NC 28405-3845 Attn: Ms. Laurie Munn Re- Tidewater Storage SW8 030620 New Hanover County, NC TE 01139 Dear Laune In response to your correspondence dated July 29, 2003, we offer the following 1 A note that "no wetlands exist on site" has been added to the plan 2 A note that "all roof drains to be routed to the infiltration system" has been provided 3 An extra copy of the site plan has been enclosed and highlighted to show the drainage area to the proposed system 4 Revised calculations including the additional pipe volumes have been provided 5 900 sf has been deducted from the proposed building area 6 Yes, Vincent visited the site with Mr Tripp and determined the SHGWT at elevation 28 3 Please review for approval and contact us with any questions, comments or if you need additional information Thank you Sincerely, Tripp Engineering, P.C. C� Charles D. Camer, E I. 00 Z1 ?0493 CDC dcb C Eric WA 7`FR Michael F Easley Governor OF Q� William G Ross Jr, Secretary O� North Carolina Department of Environment and Natural Resources Alan W Klimek, P E ,Director 0 -C Division of Water Quality Coleen H Sullins Deputy Director Division of Water Quality July 29, 2003 Mr Tom Eakes P O Box 3373 Wilmington, NC 28405 Subject REQUEST FOR ADDITIONAL INFORMATION Stormwater Project No SW8 030620 Tidewater Storage New Hanover County Dear Mr Eakes The Wilmington Regional Office received a Stormwater Management Permit Application for Tidewater Storage on June 26, 2003 A preliminary review of that information has determined that the application is not complete The following information is needed to continue the Stormwater review Please either delineate all wetlands on site, disturbed or undisturbed, or note on the plans that none exist Please provide a note on the plans that all roof drains must be directed so as to be picked •� up by the infiltration trench Please delineate the drainage area and include any off -site drainage 4 Please revise your calculations to reflect a volume calculation as detailed on the attached page This calculation increases your volume because it includes 100% of the volume inside of the pipes 5 The proposed building area is 900 square feet too high It looks like the entire square footage for the two-story building was included instead of the square footage of the footprint Please revise your calculations and the application to reflect the correct built - upon area for the buildings Has Vincent Lewis been to this site yet? Please let me know If Vincent has not visited the site, I will schedule a time for the soil investigation If no one is able to meet us on the site, please mark the location of the trenches Also, if there is a possibility of underground utilities, please mark those as well Please note that this request for additional information is in response to a preliminary review The requested information should be received by this Office prior to August 29, 2003, or the application will be returned as incomplete The return of a project will necessitate resubmittal of all required items, including the application fee N C Division of Water Quality 127 Cardanal Drive Extension (910) 395-3900 Wilmington Regional office Wilmington NC 28405 (910) 350-2004 Fax Customer Service 1 800 623-7748 A6. 10h �ENR Mr Tom Eakes July 29, 2003 Storrnwater Project No SW8 030620 If you need additional time to submit the information, please mail or fax your request for a time extension to the Division at the address and fax number at the bottom of this letter The request must indicate the date by which you expect to submit the required information The Division is allowed 90 days from the receipt of a completed application to issue the permit. The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215 1 and is subject to enforcement action pursuant to NCGS 143-215 6A Please reference the State assigned project number on all correspondence Any original documents that need to be revised have been sent to the engineer or agent All original documents must be returned or new originals must be provided Copies are not acceptable If you have any questions concerning this matter please feel free to call me at (910) 395-3900 RSS/ Ism cc Enclosure Sincerely, Laune Munn Environmental Engineer SIWQSISTORMWATIADDINFO\20031030620 ju103 doc Laurie Munn Phil Tripp, P E Job No d( ls'� Date 7 — i q —CE:b TRIPP ENGINEERING, P.C. 419 Chestnut Street, Wilmington, NC 28401 Phone (910) 763-5100 - FAX (910) 763-5631 Email tnppeng@ec rr com � 1 r yLE�TTER OF TRANSMITTAL ry To J \ C-� C� f � f-- - - Attention 1 ,� Q,� _ .( r(-" ),Is Subject r � �`„ Q !A#Gzq_ FAX TRANSMITTAL NUMBER OF PAGES INCLUDES COVER _ I am sending you (✓) ATTACHED ( } UNDER SEPARATE COVER JUL 15 2003 ( ) Prints ( ) Tracings ( ) Copy of letter ( ) Specifications ( ) Other Copies Item No _ Description �� . . . n 7 A These are transmitted as checked below ( ) For Approval ( ) For Your Use ( } Sign & Return Review cc ,.R TRIPP ENGINEERING, P.C. 419 Chestnut Street Wilmington, North Carolina 28401 Phone (910) 763-5100 • FAX (910) 763-5631 June 19, 2003 NCDENR Division Water Quality 127 Cardinal Drive Wilmington, NC 28405-3845 Attn. Ms. Linda Lewis Re: Tidewater Storage New Hanover County, NC TE 01139 Dear Linda Enclosed please find two (2) sets of plans, one (1) signed original and one (1) copy of the application form with narrative, one (1) underground infiltration trench supplement, and one check for the application fee Please review for approval and contact us with any questions, comments or if you need additional information Thank you Sincerely, Tripp Engineering, P.C. J � Jennifer Rohde JLR deb Eric £ooz 9 z N n r (12AI202M TOM FAKES PH 910-255-2018 1608 LANDFALL 09 WILMINGTON, NC 28405-4254 pav K, A Z—� 1) to thQ order of . . 8101 65-i515�0 NC Date %.Z e-;, 3 z7 i s BWnk of America. f // ACHWrO530MI96 Memo 1.05 3000 i96l: 0006 2 599 248 fir" I-- - - -- --- --- - -- - -- - - - - - - E 8 June 24, 2003 Stormwater Narrative Tidewater Storage New Hanover County, NC TE 01139 Tidewater Storage is an existing 1 31 acre vacant tract at 410 Cando Street A storage facility with 21,575 sf of buildings, 25,215 sf of asphalt access and 88 sf of concrete sidewalk is proposed Runoff from the total site, with an impervious area of 81% (1 08 acre), is to be treated by underground infiltration with no overflow No overflow is proposed, but the existing site drains to Smith Creek, classification C-SW I rn Gj --0) ---y-V4V I S i 'v}rJ r) wi I- !SS' 1 I (-Z 11CjLf 1-4 -21 S1 2� STORMWATER SUBMITTAL REQUIREMENTS T'Jt�ie-k "1 INFILTRATION/EFILTRATION SYSTEMS s—b Basins and Trench A / Site Plan J 1 Development/Project Name 2 Designer=s seal, signature, name and firm ✓ 3 Legend ^� 4 North Arrow 5 Location Map with direction, distance to named streets, NCSR numbers b Scale 7 Date $ Revision number and date Original contours, proposed contours, spot elevations, finished floor elevations Existing drainage, including off -site Include a map of any offsite areas I I Property/Project boundary lines, dimensioned 12 Mean High Water Line, if necessary 13 Drainage easements, pipe sizes 0 Wetlands delineated, or a note on the plans that none exist Infiltration system may not be located in a wetland 15 Details of the road, parking, cul-de-sacs, including sidewalks, curb and gutter Drainage area to each basin/trench delineated 17 Level spreader mechanism within a basin (Not needed for trench) 1�J.,Qr 18 Vegetated filter detail if SA waters involved This is NOT a connector ditch _ 19 Dimensions of the road, parking cul-de-sacs, sidewalks, and curb and gutter 20 Unit footprint with dimensions and concrete wood deck areas noted for apartments or condo development 21 Basin section with Bottom elevation Storage elevation Slopes 3 1 22 Trench section with Bottom elevation Height and width of trench Perforated pipe size Filter fabric Fill material Bypass structure detail Must bypass prior to entering the pond/trench (Contact DWQ for required design storm if no bypass is provided ) 24 Location of monitoring wells, if necessary 25 Vegetation requirements Weeping Love Grass is not suitable for use in NC C �) 05) Y-i Q ass f bi �C'�C/1/1 Uu� ra-vrlC�' i lam ' C �--- t a-na CC,( CS ~�� 5 k' ip vi yr d C j STORMWATER SUBMITTAL REQUIREMENTS INFILTRATION/EXFILTRATION SYSTEMS Basins and Trench Calculations Aft 1 Required volume, 1 5" for SA, 1 5" for non -SA, for bypassing systems Contact DWQ for design storm for non -bypassing systems 2 Provided volume 3 Drawdown time for the basin/trench 4 Built -upon area draining to each. basin/trench Supporting Documentation 1 A completed permit application and supplement a Is the person who signed the landowner or a leasee? Must be landowner b Sections completely filled to and initialed c Check signature per 1003 (e) Make sure title is provided d If agent signs, signatory authorization from owner e Infiltration supplement sheet provided f Mailing address & phone of applicant- no C/O g Verify water body classification h Missing information I Hand initial design requirements 2 Soils report a Type of soil b Bore location log c Depth to Seasonal High Water Table d Expected infiltration rate Use lowest value if a range is specified 3 UU 3- 3G-t-0 4- [ a1 W Zo s- Proposed deed restrictions, if applicable S Q CCU- q UO -� S C zz ) , 2 C zo-) C /-7S � � 1 Z� DCZZ�* 2- 0 2 �Q3� = 2-502-q rl,23-7) Zq I ��( -711 0 , (0 Z ( � 2-1) 1� A ,� P 1 0 FILE -MODE _ --- 766 MEMORY TX * COMMUNICATION RESULT REPORT ( OCT 30 2003 4 07PM )TTI * NCDENR WIRO - RESULT- -= PAGE OPTION _ _- ADDRESS (GROUP) _ _ __-- ----- - P 2/2 _ - ------ --- - OK --------- ---:------ - 97635631 ---TREASON-FOR ERROR ) NO FACSIMILE CONNECTION E-2) BUSY E-1) HANG UP OR LINE FAIL E-4 E-3) NO ANSWER State pf Nor& Carolina Department of Environment ad Nadu d Rosourcne `G bi ngton Regional Office Michael F, Easley, Gowmar William 0, Ross Jr., Secretary i VAX COVER SHEET Date: r0 130 L03 No. Of Pages: To: U 1'1 M U.h From:.�YL� C0; CO: FAX #: �1 3 ;51y [ FAQ: 210g35 Z 0O4 1 Kra*r W�!_al..,: f ti 127 cardinal Delve 1nv=tw4 Wilmlodbn. N.C. ge r (910) 3SO4M An Equal Oppnst dWAftlemad"Aattan VmplOW p I 4e .E MODE, 3 rMEMORY rTX 38 E�g4 9 �WM � � � TTI NCDENR WIRO COWUNICATION RESULT RE�'dRT ( JAN PAGE ADDRESS,(GROUP)� OPTZ_ — ' �g7635631 _!�piCSIMILE CONNECTION_ _ �- REASc7N FOR ERRI4RWRNG UP 4R LINE FAIL E-3) NO ANSWER State pi'North Qvoll= Depatment of Bnvim==t od Natural Resources Wilmington Resional Office Michael F. Buley, 4ovemor William G. Ross 3r., Seaeta y FAX COVER SHEEN' D06.. 10 130U3 No. OiPages: CO. CO: FAX #:_ .!I( - lo. 1 FAX#; 9 em s. - adit, --Of -a-,rtAA---CatCs.�i3 - ------ /Z��I qrd,;a,?WS , � � �r�� a)3� F An Ngaal Opportunity AiilrRAWD AWdn % "Toyer State of North Carolina ,. Department of Environment and Natural Resources Wilmington Regional Office Michael F Easley, Govemor William G Ross Jr., Secretary F YiV'wIIC6-Ij*fw.3 f R 5R35m"M Date: 10130 43 No. Of Pages: --- To: _ u ri-L Nl u-h nFom: "GLIB � lVf. t.[.v�n CO: CO: FAX #:� (a .5 � � FAX#: 910-350-2004 a 1/ 1 i :�►� 127 Lwt -:Ves-on+--MY�-call nal Mve Extension, Wihnington, Ni 2840"B45 Telephone (910) 3 3900 Fox (910) 3W2M An Equal Opportunity AMrmahve Action Employer ' 10A4 2003 Tidewater Storage 01139 CDC Infiltration Trench 10-year Storm WATERSHED DATA Total Drama a Area sq ft acres 58 370 134 Impervious Area Land Use sq ft acres buildings 21 575 050 arkm las halt 25,215 058 concrete 88 000 ,grassed parking 0 000 Total 46 878 1 08 INFILTRATION SYSTEM R v= 0 78 mf n Design Rainfall= 2 Volume of two inches and of runoff = (Design ra+nfall)(F V= 7,578 37 cu-ft 7e Pipe provided L'(7rr2) Vp = ---3A05 68—cu-ft— Volume provided (((L'W'D•)-Vp)0 40)+Vp Vt = 11,403 41 cu-ft (--7 rP v + 5 e- p-eY RATE RATE OF INFILTRATION 48 IN1HR DEPTH OF BASIN 24 IN DRAW DOWN RATE 0 5 HRS °% impervious = 0 803 = 80 3°% say 81 0°% CPRE = 025 CPOST = (°% imp)( 95)+(1-% imp)(25) = 082 12 = 5 06 in/hr 110 = 6 30 mlhr 125 = 7 13 mlhr Size (in) Length (ft) 8 365 12 795 Area (so Elevation(ft) Bottom 12000 303 Flood 12000 323 rPJvrse,j VP Vp 3 15) 5) CLk LC, l rl- P� U qkA-S -` 'tq/ 11D-If-03 �`�,J�-""� rl� �t"•`i�'f�`-iT`�r-rlt�4 �irat `�.�'�..i' I�itiar, 7r�;,��cJ�� r...l..�Y't�i'" i.; i �,/e�7+..r �'+l;.. r' ,,=s dq ` "r"'. - 'tt�, t��'i S��y,��,"}`r' F�, �"mil tY'1! rr - cx x:h , . r �, �iy j4 F v1y, 4,Tt s �lr� 2r t s y a '� �� .w �vf '"14wsaur'.Y'r�• sa �Jri t '�"r'V 1,�T < n..�'�r..yr ' r "�r f; ' A r L, ti•4,` � - r��"l a l RaX Fr`n �j`c'�rr.F�417xs„7tt �M7Af s r �i''rrto R, i d u, M +C i t d ,.� f " .+ 5 k . :r{ c 41 .rM} w.riF-._-� ...,.I.+s.a �uL..:l.i ,Gs'-t�`t.7 � l,.kh` �. e� r"+� t r ENGIN_EERIN�GCONSULTING�SERVICES,;LTD ><x.�x �G6otechniddieeGonstruction Maten s`1i'Elivironmental �+ {t,rr �`S. 1+j.V5 M a � �'✓�� a�'Y Yi �i�.f+l 1. � T'i �Y �'1� Y'r L+ �4 � �i'L� 1 V 1p } � � d / r M1", �f� � I 1 5 a • ��3i,` )� iY�l'7' 3y333',"-?T ., i� lb� j _ rJ � } ��Z r� i ��.�� ..� �., •fT' >`.; � a A�r� 7��',5, r, '4}}irrJuly ^t2003 r r "�'" -�• ' r� J • �' � ` �• rrJ'y , '(s-. .a.�i 4 fY ��r ��.. �fk 3,J�J�� ~ i . r'. Mr Phil Tnpp Tripp Engmeenng �• t 419 Chestnut Street - Wilmington, North Carolina 28401 Re Infiltration Evaluation Tidewater Storage Facility Wilmington, North Carolina ECS Project No 22 10650 Dear Mr Tripp Engineering Consulting Services, Ltd (ECS) recently conducted an infiltration evaluation for the Tidewater Storage Facility, located on Hunters Trail in Wilmington, North Carolina This letter, with attachments, is the report of our investigation Field and Laboratory Investigations On June 26, 2003, ECS conducted an investigation of the subsurface soil and ground water conditions at the location you requested as indicated on the provided Site Sketch The purpose of our investigation was to determine the infiltration rate of the subsurface soils at the test location We investigated the subsurface soil and ground water conditions by drilling a hand auger boring to depths of approximately 6 feet below the existing ground surface at the approximate location indicated We visually classified the subsurface soils and obtained representative samples of each soil type encountered We also recorded the ground water level observed at the time of the hand auger boring The attached Site Soil Evaluation Form provides a summary of the subsurface conditions encountered at the hand auger boring location A selected soil sample from the hand auger boring was tested in our laboratory for grain size analysis in general accordance with the ASTM Procedure D-422, "Particle Size Analysis of Soils" Results of those tests are tabulated on the attached Grain Size Analysis Summary Form Our field classifications and laboratory test result indicates that the subsurface soils at the test location consisted of brown to gray relatively drainable silty fine to medium sand strata Ground water was not encountered at the time of our exploration to depths investigated However, the subsurface soils below 60 inches did appear to become moist with depth P O' Box 10434, Wilmington, NC 28404 - (910) 686-9114 - FAX (910) 686-9666 - 1-800-327 5832 - Jacksonville, NC (910) 355-2727 - www ecslimued com Aberdeen MD" Atlanta, GA Austin, TX Baltimore MD Chantilly VA Charlotte NC Chicago IL Cornelia GA" Dallas TX Danville VA* Frederick MD Fredericksburg VA Greensboro NC Greenville, SC Norfolk VA Research Triangle Park NC Richmond, VA Roanoke VA San Antonio TX Williamsburg VA Wilmington NC Winchester VA *Testing Services Only ry'is summanzed on the Site Soil Evaluation Form and is also listed below The infiltration test was performed at a depth of approximately 36 inches below existing grade and indicated an infiltration rate of 0 8 inches per minute Evaluations Based on observations in the hand auger boring, it is ourjudgment that the seasonal high ground water level at the site will be at a depth of approximately 60 inches below existing grade In order to keep the base of the infiltration system at Ieast 24 inches above the level of the seasonal high ground water levels, the infiltration system will need to extend no deeper than 36 inches below existing grade at the location selected Such installation depths will place the base of the infiltration system within the upper stratum of moderately -drawable fine to medium sands Our test results indicate that the infiltration rate for these materials is as low as 0 8 inches per minute The lower stratum of relatively free-drammg fine to medium sands, within which seasonal high ground water levels are Iikely to occur, is expected to have infiltration rates considerably greater than the controlling infiltration rate of 0 8 inches per minute for the shallow soils It is also likely that the seasonal high groundwater conditions and infiltration rates can vary across this site due to naturally occurring soil type and because of the surface topography If you have any questions after reviewing this report, please do not hesitate to contact us Respectfully, ENGINEERING CONSULTING SERVICES, LTD 2 s J Stamm Construction Services Manager Attachments Site Sketch Infiltration Evaluation Grain Size Analysis Summary Form H CARS, `•�. Cr °r 5S'•'`g F ( 1 L d alid M Sobh, 22983 Principal Engmejr NC License No 2��GtNEco�,�.,; _ =a�'r.:"1.n.:..itnSTtdua.L''T.+CL4i�"'-`'Te:�+„S^ -t' -�''-`GcsT'^�xc r � �.^.,-7 �q r a yen. �L .rY '✓^+r...'nr'r'1 «. .�. "' M{r -1 r' r�s �� t a F'4, , .�k i �t r� u c h. K �cr.`„ y +��' • t if x ,�fY' rw�' C+Sj (. il"- ,,.rr a a:� :-t tit^ �¢;n f �` ^' �' r'F `itr i i,'fz�p 4`��,_r, y, ,« kns ' Jr .,/ re ° (e�h {,yy,l�f ,,r, 7Y''yCtl' b�'Sn'"' a �i1 �F$Mr'3'Si-tr1P'�P s �7' n"r. r u 7 ter• }, cray,< t,. , a jy 1_ wrv'y ,.z,✓ yti Y �., A s Y `k � � r r' { .it3 r r tisr`(r tr f• ` '� t+ �t .ct= Sw � � d w�'�" . -, ' � �t .ti � _ �' �- � +, r ' �. � 1 .� � fir++ •..� { r• 1� u �''�, .{., " "r � „� , rr{` �*.lixe ,. i�p%ro fL c �y1�1EakineerSevesrLt,E sx rl".`' .v > cF�F1 rI f'Jj k � � t "�_ � � y nfiltration Evaluation - _ i; : I ��'x?3 'Fib#rtt� 1�; ' ,�� '�. �.'tt S°*"r� q,.r `�!•n��ti� Arl 1 Job Number 110650 ` Location Wilmington NC Job Name Tidewater Storage Facility Required Minimum Blows/l 75" Contractor Tripp Engineering ttiat� F 1 �' „> Test w4t`^ y� tiorl `7 i 4 S }JS ' , is �_o Date r �[} .r r�Uy {''"4`"S^ s lElevation F1'iii�Y' s'c!'Ay9uvr 1' �+[ir w:s , �Di V epthl rw>,.K hl r'Y ' x 1 r +,ai, i t F slq•#' F :, d%�r , fc�'•- �u b Ji I lkh rr e'Y �z'' t z o '$ ,r�+,cc{ f n, x ,ter wX-Y' �+t1xF` Soii Ctassiiicatzon`, '{ FC r�at Td' rr _p� ai?<i��i''r k+>•,.,€ :$,�s s' +l',t1'i 'yi a l r, rt t74'YT rS� f J11i:F , n t1 N c r' f1- r`y:i x" r, 1 t1 f'P .n s7 ,}h 1 ! Re �i �J k� - inilT$;� 5r r{ A.s..r }4 4rr fW"'A 6`u ��k ,k 1 6/2603 0-24" Gray Fine to Medium SAND 24-54" Brown to Gray Silty Fine to Medium SAND 54-60" Gray to Orange Silty Fine to Medium SAND 60-72" Gray Fine to Medium SAND Seasonal High Water 60" No ground water encountered to depths explored Location 1 Depth Sieve Size 10 40 80 200 24-54" Percent Passing 999 928 387 94 Moisture Content/% 719 Soil Description Brown to Gray Silty Fine to Medium SAND 0 7 SETBACKijJ?;Jf=i I No 1 —_— RIM 3375 PROPOSED INV 30 8 ' 350C ATE (20 x r FIN FLOOR J J PROPOSED TWO STORY GATE 1800 SF OFFICE DIN. 2 S30' X 30') RIM 3,375, INV 30 8/'' �J Y3 ]a 3 s DI No 3 RIM 33 75 INV 308 \v, VJLV % k3{-IS( 3.. BUILDING A 1900 SF j a (20 x I t � F F E. 347 75 o f-r jt, re 3'' DI Na 0. °n ONCRETE y .� RIM 33 75 DUMPSTER PAD' �C4 �IZ M D Tidewater Storage FaC111ty W1 l m1 ngt,on, North Carol 1 na 350 PROPOSED BUILDING 4500 SF- - (3D x 150') FIN FLOOR ELEV ,35 D ,_PROPOSED BUILDING -4-7'4375 SF (25 X 175 ) -FIN, FLOOR ELEV MO _(f', ... 1. - ye PROPOSE13 BUILDING w c ".,j4 350W SF - (20 x 175 )y _ F{N,sF,L OOR FI-EY -35.0 ` o )PQ8EDrBUILDING�1900 SF F1. v 3LO - fJ x In F, �Locatl Oil i O • -:! " ;r+h - �' r y'�r �+�}.lam at- * 6rk 'x5i LATERALS, ;'' G _ - O 10, O C. (TYP x x f TIO TRENCH /J 7 `` �� tirlS�+� e O �^ _ t � � :y.• 'C i 5 '+ :C34&�s 8'x5' LATERALS T r Y t ✓.�+. 4� J� 11 `V r; E IO TRENCH I 8'x5 LATERALS f 4-F 1r1� ✓CS 1� 4 010 Oa (TYP) .' Me" 8%5 LATERALS e top W M7tm� O10 0Q (TYP) 6 a °w �?Sr 1 '1� Lif �INc L LO TRETJCH I = a `e _ s TJ PROJECT+ NO * " DRAWING' NO `r % J ir„y. - y� zu SCALE vZ �.NTS$ '}` `r• sL� R DRAWN a.