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Home My WebLink AboutSW7080618_APPROVED PLANS_20210629STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW 610/S, DOC TYPE ❑ CURRENT PERMIT APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE YYYYMMDD iVa /_10 ROY COOPER Govemor JOHN NICHOLSON Interim Secretary BRIAN WRENN Director NORTH CAROLINA Environmental Quatity June 29. 2021 County of Dare Attention: Robert L. Outten, County Manager P.O. Box 1000 Manteo, NC 27954 Subject: Stormwater Permit Renewal Stormwater Management Permit SV 7080618 Roanoke Island Senior Center Dare County Dear Mr. Outten: A Division of Energy, Mineral, and Land Resources file review has determined that Stormwater Permit SW7080618 for a stormwater treatment system consisting of an infiltration basin serving the Roanoke Island Senior Center located at 962 Marshall C Collins Drive, Manteo, NC 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. Permit application forms for renewal can be found on our website at: https://deq.nc.gov/about/divisions/energy-mineral-and-land- r--sources/stormwater/stormwater-program/post-construction-2. North Carolina General Statutes and the Coastal Stormwater rules require that this property be covered under a 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 roaer.thoroe0ncdenr.aov. Sincerely, Roger K. Thorpe Environmental Engineer — North Carolina Department of Environmental Quality Division of Energv. Mineral and Land Resources Washington Regional Office 943 Washington Square Mall 1 Washington. North Carolina 27889 252.94h 6481 k)OCKO Michael F. Easley, Governor William G. Ross Jr., Secretary North Carolina Department of Environment and Natural Resources August 7, County of Dare Attn: Mr. David Clawson PO Box 1000 Manteo, NC 27954 Subject Stormwater Review SV 7060821 Roanoke Island Senior Center Dare County Dear Mr. Clawson: Coleco H. Sullins, Director Division of Water Quality This office received a Coastal Stormwater permit application and plans for the subject project on June 5, 2008. A preliminary review of your project indicates that before a State Stormwater permit can be issued the following additional information is needed: 1. Provide soils report with on -site borings & details that support the proposed infiltration system. 2. Provide x-sections for vegetated swale; include vegetation plan. 3. It appears that 113 of the project area is excluded from the drainage basin calculations; explain. 4. The development & stormwater controls for this site could be permitted as a new/separate project, rather than modify the current permit for the Dare Administration Building. Explain. The above requested information must be received in this office prior to September 8, 2008, or your application will be returned as incomplete. The return of this project will necessitate resubmittal of all required items including the application fee. If you need additional time to submit the required information, please mail or fax your request for time extension to me at the letterhead address and include the application number on the request The request must include justification for the amount of additional time needed. The request will only be granted for justifiable delays that are unforeseen and beyond the owner or consultant's control. You should also be aware that the Stormwater Rules require that the permit be issued prior to any development activity. Construction without a permit is a violation of 15A NCAC 2H.1000 and North Carolina General Statute 143-215.1 and may result in civil penalties of up to $25.000 per day. If you have questions, please feel free to contact me at (252) 9"19, or by email: bill.moore@rcrmall.net. S'incer/ely, , Gt/ �---- William J. rn Environmental Engineer cc: Albemarle & Associates t/Washington Regional Office Internet: svww ncwllcrauahl • nr 7��One North Carolina Division of Mil Quality Phone (252)946-6481 1VO /Caro iitn�a Washington, Washington Square Mall Fax (252) 946-9215 NLurall Wazhington, NC 27889 {� v le RIEC WELY LTD. JUN - 5 2008 June 4, 2008 NCDENR Land Quality Section 943 Washington Square Mall Washington, NC 27889 ATTN: Mr. Bill Moore DWQ-WA6R® RE: Roanoke Island Senior Center Stormwater Submittal Modification of the Existing Stormwater Permit # SW7060821 Dear Bill: Please find the enclosed Stormwater Management permit revision submittal for the Roanoke Island Senior Center. The County proposes to construct a 12,390 SF senior citizen/community center on a 1.14-acre portion of the overall 21.18-acre site. On a portion of this parcel is the existing Dare County Judicial Center. This submittal is a modification of the existing State Stormwater Permit # SW7060821 that was issued on 12/7/06. As we had discussed, we can bypass this infiltration basin at the inflow flume and send excess stormwater to the wooded area to the north, which eventually drains to a culvert along US64/264 and conveys directly to the sound. We would have to add a bypass structure in lieu of the flume. I agree that our overflow should be directed to the wet pond and then to the created wetland areas but I don't want to have to pipe the overflow for the entire length of the infiltration area. Thus, I have called the infiltration area a "fore bay infiltration / filtration area" for lack of a better term. The infiltration area will be planted as illustrate on the buffer plan with live oaks on the edge and turf within the basin area. I have set the overflow elevation at 4.3' MSL and the bottom at 3.0', We show a grassed conveyance swale from the south side of the infiltration area to convey into the fore bay of the existing wet pond. We can get this pond inlet swale into either section of this pond if you do not want it in the fore bay. We did not want to have to expand the wet pond at this time due to its being landscaped and essentially completed (functioning) at this time. I did run the SA/DA numbers on this and the wet pond has the volume but not the surface area needed to accommodate this additional runoff. This proposed fore bay infiltrationtfiltration area does provide the additional surface area that was lacking in the pond. Engineenng — Surveying — Land Planning P.O. Box 3989, 115 W. Saint Clair St., Kill Devil Hills, NC 27948 Telephone: 252-441-2113 Fax: 252-441-0965 Letter to Bill More Stormwater Submittal for Dare Co. Senior / Community Center June 4, 2008 Page 2 of 2 Our plan also shows a 2000-gallon cistern that will collect rooftop run-off for use in irrigation of the landscaping. The overflow from this cistern is directed to the parking lot for sheet flow across the parking lot to the infiltration fore bay area. We are not relying on the volume in this cistern for stormwater management volume purposes and have not accounted for it in the storage calculations. The construction schedule calls for the senior citizen center project to go out for bid in 6- 8 weeks and for construction to commence in September, 2008. Your assistance in expediting the issuance of this permit would be most helpful. Enclosed with this submittal are copies of the site plan sheets, applicable application forms, fees, supporting data and calculations for this work. Please do not hesitate to call me if you have any questions regarding this project. cc: Dave Clawson — Dare County Finance Director Tim Oakley, AIA File 07699A/350 Stormwater Drainage Area #1 Drainage Area STORMWATER CALCULATIONS for ROANOKE ISLAND SENIOR CENTER 49-W sf = 1.14 ac SURFACE AREA INFORMATION Gtt revious Surface C Value Arta C•A Building/Decks/Ramps 1.00 13,686 13,686 On -site Parking 095 5,965 5,667 On -site Sidewalks 0.95 6,000 5,700 Total Impervious Arta 25,651 25,053 Stornowater Management Areas C Value Area C`A Forebay Infiltration Area 1.00 5,303 5,303 Total Stormwater Management Area 5,303 5,303 Total Contributing Area 30,954 30,356 Composite C 098 Contributing Area 0 71 ace Infiltration Basin Characteristics Basin Storage Side Slope Depth (ft) Volume (cf) Forehay Infiltration Area 1:10 1 3 5,141 Total I 5,141 Cistern Storage for reuse Size(in) length fl Volume c 2,000 gallon cistern 0 • Total 0 Rate Total n/a Main Stormwater Management V 1 5" 4.3" 50. Intensity (in /hr) 05 0.75 2 15 2.50 Runoff (cfs) 0.35 0.52 1 50 1.74 2-How Runoff Volume (cf) 2,5119 3,763 10,788 12,544 Storage Volume (cf) 5,141 5,141 5,141 5,141 Infiltration Volume (cf) 8,838 8,838 8,838 8,838 Void Volume Under Pond (cf) 0 0 0 0 Total Stormwater Managed (cf) 13,979 13,979 13,979 13,979 Percent Retained 557 % 371 % 130% 111 % - Stonnwater falling upon the drazmfield and perimeter areas with greater than two feet separation excluded from calculations due to the porosity of existing conditions - based on two hour infiltration rate. •"- cistern volume of267 CF is in excess of 100%storage volume and is not included in storage calculations JUN - 5 2002 DI ti1QANA 10 Prepared by Albemarle and Associates, Ltd. 6/4/2008 STORMWATER NARRATIVEs�® for ROANOKE ISLAND SENIOR CENTER for JUN - 5 2008 DARE COUNTY ROANOKE ISLAND, DARE COUNTY, NC DIN-11VA,R0 Dare County intends to construct a 12,390 SF senior citizen/community center on the site of the existing judicial center at 962 Marshall C Collins Drive. New parking will be constructed for 16 parking spaces. The project area is approximately 49,500 SF of the 21.18 acres of the total site located at the northwest corner of US 64 and US 64/264 in Dare County, NC, and was the site of a recently demolished ABC store. The site is level, and mostly cleared. The Soil Survey for Dare County has mapped the soils to consist of LeA (Leon fine sand). Approximately 3852 CY of soil unsuitable for structural support was previously undercut and removed, and replaced with 4,791 CY of suitable fill. Stormwater runoff from the proposed senior center roof will be collected by gutters and conveyed to a 2,000 gallon cistern. Overflow from the cistern will be diverted to the new parking lot. Runoff from the parking lot will sheetflow to a forebay infiltration area on the east side of the proposed structure. The forebay infiltration area will serve to collect sediment and infiltrate the run-off. Any overflow will be directed into a vegetated filter/swale which will further filter the run-off before eventually reaching the existing wet stormwater retention pond. Any overflow from the pond will then flow to the created wetlands to the west. An underground 2,000 gallon cistern will be utilized for reusing stormwater by providing irrigation for landscaped areas. This volume is in excess of the 100% _ storage volume provided in the forebay infiltration area. Forebay Infiltration Area: ?Y Top surface area: 5303 SIF Bottom surface area: 2607 SF ar✓� Depth: 1.3' Volume (cf): (5303 + 2607)/2*1.3 = 5141 CF Attached are the stormwater calculations for the contributing area described above. 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