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Home My WebLink AboutSW7090601_HISTORICAL FILE_20210521STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE YYYYMMDD ROY COOPER Governor DIONNE DELLI-GA TI Secretary BRIAN WRENN Dimclor Camden County Attention: Ken Bowman, Manager P.O. Box 190 Camden, NC 27921 Dear Mr. Bowman: NORTH CAROLINA Environmental Quality May 21, 2021 Subject: Stormwater Permit Renewal Stormwater Management Permit SW7090601 South Mills Fire Department Camden County IA— n .a A Division of Energy, Mineral, and Land Resources file review has determined that Stormwater Permit SW7090601 for a stormwater treatment system consisting of a wet detention basin serving the South Mills Fire Department located on Keeter Barn Road expires on December 30, 2021. This is a reminder that permit renewal applications are due 180 days prior to expiration. We do not have a record of receiving a renewal application. Please submit a completed permit renewal application along with a $505.00 fee for permit renewal. Also, it was noted in the file review that a designer's certification that the project was constructed in accordance with the approved plans as required by the permit has not been submitted. Please include this with your application. Permit application forms for renewal can be found on our website at: https://deq.ne.gov/about/divisions/energy-mineral-and-land- resources/stormwater/stormwater-program/post-construction-2. North Carolina General Statutes and the Coastal Stormwater rules require that this property be covered under stormwater permit. If you have questions, please feel free to contact me at (252) 948-3923. 1 will be glad to discuss this by phone or meet with you. If you would like, I can e-mail you a copy of the application forms. You can request a copy by e-mailing me at roger.thorpe(encdenr.gov. Sincerely, Roger K. Thorpe Environmental Engineer North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources Washington Regional Office 1 943 Washington Square Mall I Washington, North Carolina 27889 xom�rsaa,w. ��+-�\ 0-,� 252.946.6481 - Stormwater Management Plan Narrative ��lz`'- F�8S p��y — Keeter BarnRoad, Camden County South Mills Fire Department May 27, 2009 _ SEAL �. 03375pt GENERAL 11 �Ek A. Camden County proposes to construct a new Fire Station that will provide fire iion services to the northern areas of the Town of South Mills. The project site is located on the south side of Keeter Barn Road (SR 1226) approximately 1,200 if east of the intersection of Keeter Barn Road and US 17. The existing site is a 3.0 acre vacant parcel currently being utilized as farmland. The project proposes to construct an 11,700 sq.ft. fire station with vehicular accommodation areas and stormwater management infrastructure. STORMWATER MANAGEMENT Stormwater draining from proposed impervious 1§1rfaces will be directed to a stormwater wet detention basin located to the rear of the subject parcel where stormwater will be detained and concentrations of suspended sediments and dissolved pollutants will be removed prior to discharge. Current proposed site improvements will result in a site built upon area of 24%. There are potential plans for future expansion. Stormwater BMPs have been designed to manage stormwater draining from the site with a built upon area of 50%.-�'cT7, 'a"'IFIr Stormwater Collection, Treatment, Storage and Disposal JUN - 12009 Collection Stormwater draining from impervious surfaces will be directed to a grass swale collection system via site grading and roof drains. Stormwater collected in the grass swale system will be conveyed to the Wet Detention Basin. Treatment The site will offer multiples methods of stormwater treatment. The grass swale collection system draining the impervious surfaces has a total reach of approximate 400 If. The vegetation in grass swale collection system will provide a level treatment by filtering stormwater of fine particulates and pollutants prior to entering the wet detention basin. The primary method of stormwater treatment will via the wet detention basin. The wet detention basin has been design to remove 90% of the total suspended solid as outlined in the NC DENR Stormwater BMP manual. The wet detention will dilute and settle pollutants from stormwater runoff. Dissolved pollutants will be filtered and consumed by the wet detention planting located along the forebay wall and the main bay 10:1 shelf along the permanent pool water line. Storage At full build out (50% BUA) the site is calculated to generate 12,958 cf of stormwater runoff during the NC DENR required 1.5" rainfall event. The stormwater wet detention basin has a design storage below the overflow weir of 37,449 cf. 37,449 cf is calculated to be equivalent to the 4.3" rainfall event. Disposal The wet dentition basin will be drawn down using a 1.0" orifice attached to the basin's overflow structure at the season high water table (S.W.H.T.) of 9.5'. The orifice is calculated to draw down the wet detention basin below the overflow structure in 3.37 days. Stormwater in excess of the design storage will be directed into the stormwater overflow weir. The outfall for the overflow structure and the draw down orifice drains to an existing drainage ditch located at the rear of the property. Soils The USDA Soil "Survey of Camden County North Carolina" classifies the existing site's soils as Roanoke Series (RoA). Roanoke soils are generally poorly drained soils with shallow slopes (0- 2 %). A Soils Report for the site has been prepared for the site by G.E.T. Solutions and is attached in the provided calculations. The soil characteristics outlined in the soils report generally correlates with USDA RoA classification. The season high water table was observed by G.E.T. Solutions to be 2.5' — 3.0' below existing grade across the site. Existing elevations in the vicinity of the proposed wet pond are 12.2' - 12.3'. Using the observations by G.E.T., the season high water table was determined to be approximately 9.5' at the location of the wet pond. Calculations Design calculations have been included with this narrative. Conclusions The proposed stormwater management plan for the new fire station on Keeter Barn road has been designed in accordance with current stormwater regulations to manage stormwater draining from built upon areas. Hobbs, Upchurch & Associates, P.A. Consulting Engineers NJ 2522 S. Croatan Highway • Suite 2A • P.O. Drawer 1929 • Nags Head, North Carolina 27959 Fe-ir' r,'gd4R ,, _ yr May 28, 2009 Mr. Scott Vinson JUN — 12009 NCDENR—DWQ 943 Washington Square Mall Washington, NC 27889 Re: Stormwater Management Plan Application South Mills Fire Department — Keeter Barn Road Camden County Mr. Vinson, Please find attached for the Division's review a high density stormwater management plan application package for the proposed South Mills Fire Department site in Camden County. The following items are attached and are considered part of the application package: 1) Two (2) copies of the Stormwater Management Permit Application Form with one (1) copy of each BMP Supplement and Operation & Maintenance Agreement. 2) Stormwater Management Plan Narrative & Calculations 3) Two (2) copies of the site plan drawings 4) Review fee in the amount of $505.00, made payable to NC DENR If you have any questions or require additional information please do not hesitate to contact me at (252) 441-3913. Sincerely, Derek A. Dail, P.E. Hobbs, Upchurch & Associates enc: As Stated cc: Camden County Nags Head, NC • Telephone 252-441-3913 • Fax 252-441-2100 • e-mail: info@ hobbsupchurch.com Southern Pines • Myrtle Beach • Raleigh • Charlotte HOBBS, UPCHURCH & ASSOCIATES CONSULTING ENGINEERS FW P.O. DRAWER 1929 2522 S. CROATAN HWY., STE. 2A NAGS HEAD. NC 27959 PHONE: 1-(252) 441-3913 FAX: 1-(252) 441-2100 LETTER OF TRANSMITTAL Date: 5/29/09 Arm. Scott Vinson Ref.: CM0901 - South Mills Fire Station To: Scott Vinson We are sending you NCDENR-DWQ OAttached �Urd`-"12009 943 Washington Square Mall Under separate cover VIA Washington. NC 27889 The Following Item(s) : i Permit Copies O Pay Request O Samples Design Calcs ® Cover Letter Check ! Plans Copies Date Project No. Description 1 5/29/2009 CM0901 Cover Letter 1 5/29/2009 CM0901 Check to NCDENR $505.00 1 5/29/2009 CM0901 Design Calculations 2 5/29/2009 CM0901 Full Size Plans 2 5/29/2009 CM0901 Stormwater Application w/BMP and O&M 1 5/29/2009 CM0901 Plan Narrative These are Transmitted as Checked Below: s For Approval O Approved as Submitted 0 Resubmit for Approval e For Your Use O Approved as Noted O Submit for Distribution O As Requested O Returned for Corrections Return Corrected Prints O For Review and Comment O t� Prints Returned After Loan to Us Remarks: Copy To: Signed: Derek Dail, P.E.