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HomeMy WebLinkAboutSW7020216_HISTORICAL FILE_20060120STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS HISTORICAL FILE DOC DATE 2106 YYYYMM DD -rm . zor VN M 4LY4 wky_(k LL�' FINANCIAL RESPONSIBILITY /OWNERSHIP FORM \ f Z0 f 6Y0 SEDIMENTATION POLLUTION CONTROL ACT No person may initiate a land -disturbing activity on one or more acres as covered by the Act before this form and an acceptable erosion and sedimentation control plan have been completed and approved by the Land Quality Section, NC Department of Environment, and Natural Resources. (Please type or print and, if question is not applicable, place NI A in the blank). Part A. 1. Project Name Currituck Law Enforcement Center Kitchen Addition 2. Location of land -disturbing activity: County _ Currituck _ 3AN 2 0 ?Qa6 City or Township Maple and Highway/Street SR 1246 `t g . M AMO 3. Approximate date land -disturbing activity will be commenced: ` March 2006 4. Purpose of development (residential, commercial, industrial, etc.): _ Institutional 5. Total acreage disturbed or uncovered (including off -site borrow and waste areas): 6. Amount of fee enclosed S 100.00 7. Has an erosion and sedimentation control plan been filed? Yes _X^ _ No Enclosed X_ 8. Person to contact should sediment control issues arise during land -disturbing activity Name Mr. Dan Scanlon Telephone (252)_232-2242 g Landowner(s) of Record (Use blank page to list additional owners): County of Currituck Lon -Term Lessee of the State Name(s) P. 0. Box 38 Current Mailing Address Currituck NC 27929 City State Zip 10. Recorded in Deed Book No. I Part B. Current Street Address EC'E0W: JAN 2 U 2006 �AI�7i3_Q1WITY SEMI, WASHINGTON REGIONAL OFFICE City State Zip Page No. 1.36 76 Person(s) or firm(s) who are financially responsible for this land -disturbing activity (Use a blank page to list additional persons or firms): County of Currituck Name of Person(s) or Firm(s) P.O. Box 38 Current Mailing Address Currituck NC _ _ 27929 City State Zip Current Street Address City State zip Telephone _ (252) 232-2242 Telephone 2. (a) If the Financially Responsible Party is not a resident of North Carolina give name and street address of a North Carolina Agent, NIA Name Mailing Address Ulty State z tp Telephone Street Address City State Zip Telephone (b) If the Financially Responsible Party is a Partnership or other person engaging in business under an assumed name, attach a copy of the certificate of assumed name. If the Financially Responsible Party is a Corporation give name and street address of the Registered Agent. NIA Name of Registered Agent Mailing Address City State Zip Telephone Street Address City State Zip Telephone The above information is true and correct to the best of my knowledge and belief and was provided by me under oath. (This form must be signed by the financially responsible person if an individual or his attorney - in -fact or if not an individual by an officer, director, partner, or registered agent with authority to execute instruments for the financially responsible person). I agree to provide corrected information should there be any change in the information provided herein. Mr. Dan Scanlon Type or - me Signature County Manager Title or Authority 1 -tom QL� Date I, M a Notary Public of the County of Ci' ev) State of North Carolina, hereby certify that ,aca-v, se- F G aa-n ( o n, = appeared personally before me this day and being duly sworn acknowledged that the above form was executed by him. Witness my ]rand and notarial seal, this / F day of J a-m Seal Notary My commission expires ,4111111 Quible Quiblo & Associates, P.C. ENGINEERING • ENVIRONMENTAL SCIENCES • PLANNING - SURVEYING �` SINCE 1959 D January 13, 2006 JAN 2 0 2006 Mr. Bill Moore DWQ-WARO NCDE & NR Division of Water Quality 943 Washington Square Mall Washington, North Carolina 27889 Subject: Stormwater Management Plan (High Density Application) Currituck County Law Enforcement Centcr Kitchen Addition Currituck County, North Carolina Dear Mr. Moore: P.O. Drawer 870 Kitty Hawk, NC 27949 Phone:252-261-3300 Fax:252-251-12E0 PRINCIPALS Soon C. Boyle, P.E. Joseph S. Lassiter, C E.P. Eduardo J, Valdlvieso, RE ASSOCIATES Joseph J. Anlaut. P.E. Katherine C. Marcheno, P,L.S. On Behalf of The County of Currituck, I hereby submit for review and approval a North Carolina Division Of Water Quality, Stormwater Management Permit Application package for the proposed kitchen addition to the Currituck Law Enforcement Center. The proposed kitchen addition is contained entirely within its own drainage area and, therefore, does not. contribute runoff to, or alter in any way, the existing stormwater management system. Pursuant to this condition, the stormwater management system for the new addition is being permitted as a stand-alone system with its own independent drainage area and the permit application does not address the existing system. The project proposes to build a kitchen addition that will serve the prison and to expand the on -site parking for the Law Enforcement Center employees. The proposed kitchen addition and parking expansion will result in the addition of 32,290 sf of impervious area, resulting in 106,752 sf, or 24% total coverage for the site. The Stormwater Management Plan for the proposed development will utilise overland flow through vegetated buffers to provide filtration and collection in adjacent infiltration basins to provide infiltration of stormwater. The enclosed narrative will explain in detail the stormwater management of this site. The following items are included and shall be considered part of this submittal package: • I . Review Fee Check for $420.00 • 2. Two (2) Copies of the Stormwater Management Permit Application Form • 3. Stormwater Management Plan Narrative • 4. Calculations and Supporting Data'f t1ooS t • 5. Two (2) sets of plans Please contact me with any questions or requests for additional information Sincerely, Quible & Associates, P.C. o c k, Derek A. Dail, E.I. enc: as stated cc: Mr. Dan Scanlon, Manager, Currituck County Ao A Quible Quible & Associates, P.C. ENGINEERING • ENVIRONMENTAL SCIENCES • PLANNING • SURVEYING SINCE 1959 March 30, 2006 Ms. Amy Franklin NCDENR Division of Water Quality 943 Washington Square Mall Washington, North Carolina 27889 P.O. Drawer 870 Kitty Hawk, NC 27949 Phone: 252-261-3300 Fax: 252-261-1260 PRINCIPALS Sean C. Boyle, PE. Joseph S. Lassiter, C.E.P. Eduardo J. VaIdivieso. P E. ASSOCIATES Joseph J. Anlouf, P.E. Katherine C, Marchello, PIS, 6E� MAR 31 Z006 RE: High Density Stonnwater Permit Application - Currituck Law 1nforcement Center• Kitchen Addition Revisions to hxisting Infiltration Basin Dear Ms. Franklin; I am sending this package as a follow-up to our conversation regarding the existing stonnwater pernlit for the Currituck Law Enforcement Center site. You are currently reviewing an application package for stonnwater associated with a Kitchen Addition at the Law Enforcement Center site. 'file infrastructure lbr the addition was designed such that all runoff from impervious areas associated with this new construction is collected independent of the existing stormwater management system and conveyed to a new infiltration basin at the southern extremity of the site. This package does not change that proposal in any way. The original infiltration basin was configured in such a manner that storage is located too close (within 100') to all existing County water supply well. The enclosed plan, supplement, and calculations propose to re -configure that existing basin in order to honor the needed setbacks. As per our phone conversation, a note has also been added to the plan sheet clarifying that no wetlands exist on the project site. Please note that even though this reconfiguration does not alter the system associated with the Kitchen Addition in any way, we are requesting that this re -configuration be included in the permit currently being processed as the re -configuration will be made a part of the Kitchen Addition plans and the work will be performed by the Kitchen Addition Contractor. Enclosed, for your review, please find the following items: Two (2) copies of Plan Sheet C2.2 (sheet added to Kitchen Addition Plan Set) Two (2) copies of Infiltration Basin Supplement for the re -configured basin Two (2) copies of calculations for the re -configured infiltration basin If you have any questions or need any further information, please contact nie at 252-261-3300, Sincerely; uible ssoc' tes, P.C. bpi Deel, P.E. Eric]: As stated ArF9 : t_ Miciad F. Easley, Governor WMimn G. Ross Jr, Icy , !� r North Carolina Department of Environment and Natural Rrsourccs ~ Alan W. Klimdc, P.E` Dkvctar Division of Water Quality April 10, 2006 r k, Mr. Dan Scanlon Currituck County Manager PO Box 39 Currituck, NC 27929 Subject Stomrnrater Review SW7020216-Mod Currituck County Law Enforcement Kitchen Addition Currituck County Dear Mr. Scanlon: This office received a Coastal Stormwater permit application and plans for the subject project on January 20, 2006. A preliminary review of your project indicates that before a State Stormwater permit can be issued the following additional information is needed. ➢ Please provide additional soils information for the area along the fence. ➢ Please provide an engineer certification for the existing infiltration basin. ➢ Please note that the existing infiltration basin should have 3:1 side slopes. The above requested information must be received in this office prior to May 10, 2006 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 this office at the Letterhead address. 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 211.1000 and North Carolina General Statute 143-215.1 and may result in civil penalties of up to $10,000 per day. Please reference the Stormwater Project Number above on all correspondence. If you have questions, please feel free to contact me at (252) 948-3934. Sincerely, d't —1 Amy L. Franklin Environmental Engineer Washington Regional Office cc: Washington Regional Office Andy Deal, PE No�rthCarolina Natuzally North Carolina Division of Water Quality Washington Regional Office Phone (252) 9416-6491 FAX (252) 946-9: 15 Customer Service Internet ncwateraualb.org 943 Washington Square Mall, Washington, NC 27889 1-877-623-6749 An Equal OpportunitylAfirrnative Action Employer- 5D% Recydedll D% Post Dxzumer Paper �OF \N A 7- 9p Michael F. Easley, Governor �O G William G. Ross Jr., Secretary DW r North Carolina Department of Environment and Natural Resources -� Alan W. Klimek, P.E. Director Division of Water Quality March 27, 2006 " Mr. Dan Scanlon Currituck County Manager PO Box 39 Currituck, NC 27929 Subject: Stormwater Review SW7060122 Currituck County Law Enforcement Center Kitchen Addition Currituck County Dear Mr. Scanlon: This office received a Coastal Stormwater permit application and plans for the subject project on January 20, 2006. A preliminary review of your project indicates that before a State Stormwater permit can be issued the following additional information is needed. ➢ It is this offices understanding that the county will be submitting a modification to the existing Stormwater permit (SW7020216). Please combine the two projects under the existing Stormwater number and resubmit the project. Please note an additional application fee is not required. The above requested information must be received in this office prior to April 27, 2006 or your application will be returned as incomplete. The return of this project will necessitate resubmittai 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 this office at the Letterhead address. You should also be aware that the Stormwater Rules require that the permit be issued prior to any development activity. Construction withouta 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 $10,000 per day. Please ,reference the Stormwater Project Number above on all correspondence. If you have questions, please feel free to contact me at (252) 948-3934. Sincerely, j lf ri u 10,J,t /J�r= Amy L. Franklin Environmental Engineer Washington Regional Office cc: Washington Regional Office David Deel, PE, Quibie and Associates ne Cal'Ohn Jl�atcrra!!p North Carolina Division of Water Quality Washington Regional Office Phone (252) 946-6481 FAX (252) 946-9215 Customer Service Internet: nouaterguality.om 943 Washington Square Mail, Washington, NC 27889 1-877-623-6748 An Equal Opportunity/Affirmative Action Employer— 50% Recycled110% Post Consumer Paper 1959 Q u i b I a sINCF, Quible & Associates, P.C. ENGINEERING • ENVIRONMENTAL SCIENCES • PLANNING • SURVEYING 8 Juniper Trail • P.O. Drawer 870 • Kitty Hawk, INC 27949 Phone 252-261-3300 • FAX 252-261-1260 • E-Mail quible@earthlink.net JOB (ca �17� GLEG M�,r?�trcatlak�. �n ��c: 5a#� SHEET NO. OF CALCULATED BY _ A D DATE CHECKED BY SCALE DATE "'Qu I b I e SINCE 1959 Quible & Associates, P.C. ENGINEERING • ENVIRONMENTAL SCIENCES • PLANNING • SURVEYING 8 Juniper Trail • P.O. 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P.O Drawer870 ENGINEERING • ENVIRONMENTAL SCIENCES • PLANNING • SURVEYING SINCE 1959 April 24, 2006 Ms. Amy Franklin NCDENR Division of Water Quality 943 Washington Square Mall Washington, North Carolina 27889 RE: Currituck Law Enforcement Center Kitchen Addition Stormwater Review SW7020216-Mod Dear Ms. Franklin; RECFIVED Apt 2 6 Z006 ® 9Y t7 Ct - ti AR0 Kitty Hawk. NC 27949 Phone:252-261-3300 Fax: 252-261-1260 PRINCIPALS Sean C. Boyle, P.E. Joseph S. Lassiter. C.E.P. Eduardo J Voldivieso, P.E. ASSOCIATES Joseph J. Anhui, P.E. Kathenne C. Marchello, P.L.S, I am sending this package in response to your April 10`I' letter regarding your review of the above referenced application. Upon review of the plans and a site inspection, you requested additional information as follows: Request: Please Provide additional soils irrfnr)nation fr)r the area along the,fence. Response: Warren Eadus, a Licensed Geologist on our staff, visited the site and took three additional borings for our reference; two along the fence line and one within the main area of the proposed infiltration basin. Boring Logs are attached. As shown in the logs, the soils consist generally of' fine silty sands with a layer of clayey fine sands at T-T of depth. The excavation for the infiltration basin will remove this clayey sand layer (excavation will generally be 3' deep throughout), leaving only fine sand to silty fine sand. This remaining soil will be suitable for placement of an infiltration system. Request: Please pi-ovlde a)1 engineer Certlf Catlon.fJr the existing infiltration basin. Response: I have attached an engineer certification for the existing infiltration basin. Please note that the certification lists as an exception to grading of the side -slopes, which will be corrected with other basin modifications proposed with this application. Request: Please note that the evlsting infiltration hasln should have .3: 1 side slUPes. Response: I have added a note requiring a re -grade of the basin side -slopes in order to provide the originally proposed 3:1 slope. An 8 ''/2" x I I " plan excerpt showing this notation has been attached to this letter. At your earliest convenience, please take an opportunity to review the enclosed information for compliance with your requirements. If you have any questions or need any further information, please contact me at 252-261- 3300. Sincerely; Q ible & Associates P.C. D� id A. D l P.E. Encl: As stated Quible & Associates, P.C. P.O. Dower 870 Kitty Hawk NC 27949 ENGINEERING • ENVIRONMENTAL SCIENCES • PLANNING • SURVEYING Phone: 252-261-= --- SINCE 1959 Fax:252.261-1260 PRINCIPALS Sean C. Boyle, P.E. MEMORANDUM Joseph S. er. C.E.P. Eduardo J. VaIdnldivieso, PE. —ASSOCIATES Joseph J, Anlaut, P E. KatheMe C. Niarchello. P.L.S. To: Andy Deel, P.E. From: Warren Eadus, L.G. Re: Currituck County Law Enforcement Center Andy: Please find enclosed boring logs for three borings installed to eight feet below ground surface at the Currituck Law Enforcement. The locations of the borings are shown on the enclosed site sketch. Thanks, Warren Eadus, L.G. enc as stated his— I 2. 3. 4. 5. 6. 7. 8. Quible SINCE 1959 & Associates, P.C. WELL LOG/BORING LOG PURPOSE OF WELL/BORING ENGINEERING = PLANNING ' SURVEYING ' ENVIRONMENTAL SCIENCES Phone: (252) 261-3300 Fax: (252) 261-1260 E—Mail: quiblepoarthllnk.com ON WELL/BORING LOCATION C* .k-A- -WPOP�_W lt' _ OWNER/ADDRESS 413 mhApr Py /flk, Z DATE INSTALLED L f f Zoo TOTAL DEPTH _ 15 F�-T = STATIC WATER LEVEL -t" 4 _Fg5a�r F G 5 TOPOGRAPHIC LAND SETTING LATITUDEILONGITUDE d 2 11 Jr" a " DEPTH (FT) 9. CASING AIA7 FROM_. TO 10. SCREEN NA- FROM-- TO 11. SAND PACK ##L`TO 12. GROUT &r FROM TO 13. COMMENTS Alk LOCATION SKETCH fN LvP'B•Ixa41� �°i kta4O" SAU* SCS� I DEPTH FORMATION DESCRIPTION " _ 4 0 -& ` J> glow+-p � i�la� S doyDS �_l Wt �_N o iL S,f,TS .T 1001.e� emu- -�— / n Aft AfrL7sS >'bG1.� ./ � S t 4 r 10 u es" bS• sc. � o�sz—r Obs ,s� (f7uR 3 _mot �OuIG 3 z Cow �37zowN Ir .sftNos w Z • 5 ro -vtoe Sow* cNo� ` &s IA t 'l�•c.G 5 kzo & 4?,.r, S S �R- •S v_vvp_s Quible SINCE 1959 & Associates, P.C. WELL LOG/BORING LOG ENGINEERING * PLANNING * SURVEYING * ENVIRONMENTAL SCIENCES Phone: (232) 201-3300 Fax: (252) 261-1260 E-Mall: quihlo9earthlink.eam 1. PURPOSE OF WELL/BORING 4-ffft" �S zkN 2. WELL/BORING LOCATION iA 99& rWk ArM "W �0/�T 3. OWNER/ADDRESS 2 4. DATE INSTALLED AP 5. TOTAL DEPTH t fe t- _ 6. STATIC WATER LEVEL T- G. 6 WT 7. TOPOGRAPHIC LAND SETTING 8. LATITUDE/LONGITUDE I&` s- • Z7-' N _ ` v g . ZS V4 DEPTH (FT,) 9. CASING NA- FROM_ TO 10. SCREEN Rk- FROM______TO 11. SAND PACK W& To 12. GROUT NI% FROM —To 13. COMMENTS A LOCATION SKETCH Ilk% 1401� SA*,c d DEPTH 0 +ri Z. Z,r 3` F. r � S -:�iS-7— FORMATION DESCRIPTION LO ! t 11-l>c P*g&. SpowN s*wt>s IK cN oJL 0f=f4Awv- loom- 4 'Oft 0 a. F;Fkgw fWarSA00S - Iftrj 4 r0*00., 100sr-1 �I 0 g oo LNG �F. luo!s T,, �lzlra�L 10 „IL -8 (6Z1 w gopwN sAs d G s ( 0 "4- 2...Su:�1,—ra)ES4nt05 0 I r 3 Quible SINCE 1959 & Associates, P.C. WELL LOG/BORING LOG ENGINEERING * PLANNING : SURVEYING c ENVIRONMENTAL. SCIENCES Phone: (252) 261-3300 Fax: (252) 261-1260 E-Malt: quibte®oorthlink.com 1. PURPOSE OF WELL/BORING G 1 06 ON 2. WELL/BORING LOCATION 3Ei 1,#W 67V C:CNTS9 . 3. OWNER/ADDRESS 4/3 /Ltkmc _ > , ^A NG "74' 4. DATE INSTALLED .APP.(L I+ 2.D!?(.0 _ 5. TOTAL DEPTH 6. STATIC WATER LEVEL i S 7. TOPOGRAPHIC LAND SETTING E �L 8. LATITUDE/LONGITUDE :W 2 3' Sir 12Y AJ 4/a ` o 1 1 $ Z! W DEPTH (PT.) 9. CASING N k FROM —TO TO 10. SCREEN NA' FROM TO 11. SAND PACK M&u-TO 12. GROUT 0 4- FROM— To 13. COMMENTS ME LOCATION SKETCH pcv.ro i N 58-3 DEPTH FORMATION OESCRIMON p 3t U L Z RmL�l -aWN CL A -{a Mir u�41r b s' 4r _ram -Tmb s i 1"rr, WF SRfvpS 5 Rr 41 o ote. *mp s • War' . If `5 pS 2 iv NF fr PF o �MM Magom34, Namo:CURRDlJCK Location: O38"%3'45�9"N 078°0T�385"VV Date: 1/�OOs � � � Caption: r�uohC Justice Scale: 1 inch equals 20ODfeet USBSTop - C,rrtiuok 771, ME M 7, *,, i MM I Mol Quible Quible & Associates, P.C. P.O.nrower870 Kitty Hawk, NC 27949 ENGINEERING • ENVIRONMENTAL SCIENCES • PLANNING • SURVEYING Phone', 252-261-3300 SINCE 1959 Fax: 252-261-1260 PRINCIPALS Sean C. Boyle, PE. A ril 24, 2006 Joseph S. Lass4ec C.E.P p Eduardo J, Valdivieso, P E ASSOCIATES Joseph J. Anlauf, P.E. Katherina C. MarchelIc. P.L.S. Ms. Amy Franklin NCDCNR Division of Water Quality 943 Washington Square Mall Washington, North Carolina 27889 RE: Engineer's Certification - Currituck County Law Enforcement Center High Density Stormwater Permit No. SW7020216 Dear Ms. Franklin; The purpose of this letter is to certify that, based on periodic construction inspections and final inspection of the stormwater management facilities at the Currituck County Law Enforcement Center, the facilities were constructed in substantial conformance with the approved plans and specifications with one noted exception: The infiltration basin side -slopes appear to have been constructed at a slope exceeding the 3:1 maximum slope. Modifications to this existing infiltration basin are the subject of a new permit application (SW7020216-Mod) and include re -grading of the infiltration basin side -slopes to conform to the 3:1 maximum. If you have any questions or need any further infornzation, please contact me at 252-261-3300. Sincerely; uible & ssociates, P.C. avid A, D , Encl: As stated ' x SEED DISTURBED AREA IN ACCORDANCE WITH THE PROJECT SEEDING SPECIFICATIONS \ �� NEW INFILTRATION BASIN \ AREA TO BE EXCAVATED BOTTOM ELEV, O 14.0, A I 1CA��,�� L eA�i - PORTION OF EXISTING INFILTRATION 1 C$ `pfl0a 4Ota BASIN TO BE FILLED - - - - - - - - - - - - - - - - - - - - - - - - - — 1 %'� — — -- — -- - c - - - - - - - - - - - -/- - 1013 jA- - - - I, .a EicoRrONA FGIT -' I I I INFIL TRA TION BA5IN ' 14.0 '� - _/ -�`- / WITH DI - SEED STURBED RACCORDANCEEA IN PROJEECTSEEDINGSPECIFICATIONS SAW PAS I I CONTRACTOR TO RE -GRADE BASIN SIDE -SLOPES TO CONFORM I I 14 ♦ ' / // TO 3:1 MAXIMUM SLOPE, I IAIV O /40' IV I \ / �L T� , COfL TAMC] I Q I� f- �- - -xv- ry>rr----- Ar. Quible Quible & Associates, P.C. ENGINEERING • ENVIRONMENTAL SCIENCES • PLANNING SINCE 1959 April 17, 2002 Mr. Roger Thorpe NCDE & NR Division of Water Quality 943 Washington Square Mall Washington, North Carolina 27889 :c: infiltration Basin Supplement Currituck County Law Enforcement Center Currituck County, North Carolina Dear Mr. Thorpe: DECEIVED ., . 1 APR 1 9 2002 DVQ-WARD P.O. Drawer 870 IOFIy Hawk, NC 27949 Phone: 252-261-3300 Fax: 252-261.1260 PRINCIPALS Soan C. Boyle, P.E. Joseph S. Lassiter, C.E.P. Eduardo J. ValdlvIeso, P.E. ASSOCIATES Joseph J. Anlaut, P.E. David S. Neff As per our telephone conversation, attached, please find an Infiltration Basin Supplement for the Stormwater Management Application for the above referenced project. This supplement supplies additional information pertinent to the site being treated as a "high density pocket" rather than the originally proposed low density project. If you have any questions, or require any additional information, please do not hesitate to contact me at (252 ) 261-3300. Sincerely, Quible & AL ssoc'• tes, P.C. David A. l,P.E. enc: as stated cc: Mr. Dan Scanlon, i'✓larcager, Currituck Counry Oa.3Rb of WArF9 `fly pG r > i �•1 vN: = :lW -c Michael F. Easley Governor William G. Ross Jr., Secretary Department of Environment and Natural Resources DIVISION OF WATER QUALITY April 19, 2002 Mr. Dan Scanlon, Manager Currituck County P.O. Box 38 Currituck, NC 27929 Dear Mr. Scanlon: Gregory J. Thorpe, Ph.D., Acting Director Division of Water Quality Subject: Stormwater Permit No. SW7020216 Currituck Law Enforcement Center High Density Stormwater Project Currituck County The Washington Regional Office received the completed Stormwater Application for the subject project on April 19, 2002. Staff review of the plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding Permit No. SW70020216 dated April 19, 2002 to Currituck County for an infiltration basin to serve the Currituck County Law Enforcement Center located adjacent to the Currituck County Airport. This permit shall be effective from the date of issuance until April 19, 2012 and shall be subject to the conditions and limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements in this permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system will result in future compliance problems. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing upon written request within thirty (30) days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this permit shall be final and binding. 943 Washington Square Mall Washington, NC 27889 252-946-6481 (Telephone) 252-946-9215 (Fax) F9 Dan Scanlon April 19, 2002 Page Two If you have any questions, or need additional information concerning this matter, please contact Roger K. Thorpe at (252) 946-6461, extension 214. Sincerely, �- Jim Mulligan Water Quality Regional Supervisor Washington Regional Office cc: Quible & Associates Currituck County Inspections- WaRO Stormwater Files Central Files State Stormwater Management Systems Permit No. SW7020216 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 Currituck County FOR THE construction, operation and maintenance of stormwater management systems 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 for, grassed swales and an infiltration basin to serve the Currituck County Law Enforcement Center located adjacent to the Currituck County Airport. This permit shall be effective from the date of issuance until April 19, 2012 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 2 of this permit, the Project Data Sheet. 3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. DIVISION OF WATER QUALITY PROJECT DATA Project Name: Currituck County Enforcement Center Permit Number: SW7020216 Location:. Currituck County Applicant: Currituck County Mailing Address: P.O. Box 38 Currituck, NC 27929 Application Date: 2/27/2002 Water Body Receiving Stormwater Runoff: UT to North River Classification of Water Body: C Total Site Area: 10.37 acres Total. Impervious Surfaces Allowed: 1.72 acres proposed Basin Depth: 1..3 feet Required Storage Volume: 6,135 cf Provided Storage Volume: 23,453 cf Overflow elevation 15.3 feet Law 4. No homeowner/lot owner/developer shall be allowed to fill in, alter, or pipe any vegetative practices (such as swales) shown on the approved plans as part of the stormwater management system without submitting a revision to the permit and receiving approval from the Division. 5. The following items will require a modification to the permit: a. Any revision to the approved plans, regardless of size b. Project name change C. Transfer of ownership d. Redesign or addition to the approved amount of built - upon area e. Further subdivision of the project area. In addition, the Director may determine that other revisions to the project should require a modification to the permit. 6. 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. II. SCHEDULE OF COMPLIANCE I. The permittee will comply with the following schedule for construction and maintenance of the stormwater management system. a. 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 surfaces exdept roads. b. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 2. The facilities must be -properly maintained and. operated at all times. The approved operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals. 3. The permittee shall at all times provide the operation and maintenance necessary to assure the, permitted stormwater system functions at optimum efficiency including, but not limited to: c a. Semi-annual scheduled inspections (every 6 months) b. Sediment removal C. Mowing and revegetation of side slopes d. Immediate repair of eroded areas e. Maintenance of side slopes in accordance with approved plans and specifications f. Debris removal and unclogging of outlet structure, orifice device and catch basins and piping. 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. 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 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. Mail the Certification to the Washington Regional' Office, 943 Washington Square Mall, Washington, North Carolina, 27889, attention Division of Water Quality. 7. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of five years from the date of the completion of construction. III. GENERAL CONDITIONS 1. This permit is not transferable. In the event there is a desire for the facilities to change ownership, or - there is a name change of the Permittee, a formal permit 'request must be submitted to the Division of Water Quality accompanied by an application fee, 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. 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 143-215.6(a) to 143-215.6(c). 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 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. Permit issued this the 19 th day of April, 2002. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION jr Grego y J. Thorpe,"Ph.D., Acting,Director Division of Water Quality By Authority of the Environmental Management Commission Permit Number SW7020216 Currituck County Law Enforcement Center Stormwater Permit No. SW7020216 Designer's Certification I, - I , as a duly registered Professional Engineer in the State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the project, for (Project) (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. Signature Registration Number Date Quible Quible & Associates, P.C. ENGINEERING • ENVIRONMEN[AL SCIENCES • PLANNING SINCE 1959 FECE�Vi D February 21, 2002 Mr. Bill Moore FEB 2 ( 20V NCDE & NR Division of Water Quality DWQ-WARD 943 Washington Square Mall Washington, North Carolina 27889 Re: Stormwater Management Plan (Low Density Application) Currituck County Law Enforcement Center Currituck County, North Carolina Dear Mr. Moore: P.O. Drawer 870 IGf1y Hawk, NC 27949 Phone:252-261-3300 Fox: 252-261-1260 PRINCIPALS Sean C. Boyle, P.E. Joseph S. Lassiter, C.E.P. Eduardo J. Valdlvieso, P.E. A -SLATES Joseph J. Ankxif, P.E. David S. P.E. On Behalf of The County of Currituck, I hereby submit for review and approval a North Carolina Division Of Water Quality, Stormwater Management Permit Application package for the proposed renovation of the old Maple Prison in Maple, North Carolina. The proposed renovation 1 conversion consists of the removal of several existing buildings and construction of one new building along with additions to several existing buildings along with parking and utility improvements. The renovation / conversion will result in the addition of 27,700 sf of impervious area, resulting in 74,741 sf, or 16.5% total coverage for the site. The project falls within the Low Density classification and the stormwater management plan proposes Stormwater controls (infiltration basins) above and beyond what is prescribed by the applicable low density classification. The enclosed narrative will explain in detail the Stormwater management of this site. The following items are included and shall be considered part of this submittal package: 0 1. Review Fee Check for $420.00 0 2. Two (2) Copies of the Stormwater Management Permit Application Form 0 3. Stormwater Management Plan Narrative 0 4. Calculations and Supporting Data 0 5. Two (2) sets of plans Please contact me with any questions or requests for additional information at (252)261-3300. Sincerely, bavid leAsso 'ate - P.C. . Deel, P.E. eLTc: as stated cc: Mr. Dan Scanlon, Manager, Currituck Coun y Date Received Fee Paid Permit Number rn�lll�'1 5 vJ7 v ry State of North Carolina r C-�' ' 2H2 Department of Environment and Natural Resources Division of Water Quality `� U A n [)WQ-WARO e STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may be photocopied for use as an original I. GENERAL INFORMATION 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): County of Currituck 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): Dan Scanlon —Manager 3. Mailing Address for person listed in item 2 above: PO Box 38 City: Currituck State: NC Zip: Telephone Number. 252 232-2242 27929 4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): Currituck County Law Enforcement Center 5. Location of Project (street address): Adjacent to Currituck County Airport on SR 1246 approx. 3840 feet North of intersection 0 City: Maple County: Currituck 6. Directions to project (from nearest major intersection): Located adjacent to the Currituck County Airport on SR 1246 approx. 3840 feet North of the intersection of US 158 and SR 1246. 7. Latitude: 76001108" Longitude: 36023'56" of project 8. Contact person who can answer questions about the project: Name: David A. Deel Telephone Number: ( 252 ) 261-3300_ II. PERMIT INFORMATION: 1. Specify whether project is (check one): X New Renewal Modification Form SWU-101 Version 3.99 Page 1 of 4 2. If this application is being submitted as the result of a renewal or modification town existing permit, list the - existing permit number and its issue date (if known) V 3. Specify the type of project (check one): _Low Density High Density X Redevelop General Permit Other 4. Additional Project Requirements (check applicable blanks): ^CAMA Major X Sedimentation/Erosion Control _404/401 Permit _NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748. III. PROJECT INFORMATION 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project. Stormwater from proposed development will be collected and treated in a series of interconnected infiltration-swales which will ring the proposed developed area. 2. Stormwater runoff from this project drains to the 3. Total Project Area: 10.37 Acre%cres 5. How many drainage areas does the project have? Pasquotank River basin. 4. Project Built Upon Area: 16.5 % 6. Complete the following information for each drainage area. If there are more than two drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as below. } s8 �"`• E,,ya'` �eziz` Sasuz InfQrmatrvn a y. M M -__ L °" t�3?ra�nag��Area�1�' c - yx,N s - 9s s £$ ��Drarna a Areaw Receiving Stream Name North River Receiving Stream Class SC Drainage Area 117,459 Existing Impervious* Area 47,041 Proposed Imervious`Area 74,741 (Total Post -Cons ruction impervious) % Impervious* Area (total) 16.5 % im ggi 'SS. On -site Buildings 31,040 sf On -site Streets N On -site Parking 33,946 sf On -site Sidewalks 9,487 s Other on -site Off -site Total: 74,741 sf Total: Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. Form SVM-10I Version 3.99 Page 2 of 4 7. How was the off -site impervious area listed above derived?N I IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS The following italicized deed restrictions and protective covenants are required to be recorded for all subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table listing each lot number, size and the allowable built -upon area for each lot must be provided as an attachment. 1. The following covenants are intended to ensure ongoing compliance with state stormwater management permit number as issued by the Division of Water Quality. These covenants may not be changed or deleted without the consent of the State. 2. No more than 112,292 square feet of any lot shall be covered by structures or impervious materials. Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do -not include wood decking or the water surface of swimming pools. 3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings. 4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to construction. 5. All permitted runoff from outparcels or future development shall be directed into the permitted stormwater control system. These connections to the stormwater control system shall be performed in a manner that maintains the integrity. and performance of the system as permitted. By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the applicable items required above, that the covenants will be binding on all parties -and persons claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the sale of any lot. V. SUPPLEMENT FORMS The applicable state stormwater management permit supplement form(s) listed below must be submitted for each BMP specified for this project. Contact the Stormwater and General Permits Unit at (919) 733-5083 for the status and availability of these forms. Form SWU-102 Wet Detention Basin Supplement Form SWU-103 Infiltration Basin Supplement Form SWU-104 Low Density Supplement Form SWU-105 Curb Outlet System Supplement Form SWU-106 Off -Site System Supplement Form SWU-107 Underground Infiltration Trench Supplement Form SWU-108 Neuse River Basin Supplement Form SWU-109 Innovative Best Management Practice Supplement Form SWU-101 Version 3.99 Page 3 of 4 V1. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ). A complete package includes all of the items listed below. The complete application package should be submitted to the appropriate DWQ Regional Office. Please indicate that you have provided the following required information by initialing in the space provided next to each item. Initials • Original and one copy of the Stormwater Management Permit Application Form • One copy of the applicable Supplement Form(s) for each BMP • Permit application processing fee of $420 (payable to NCDENR) • Detailed narrative description of stormwater treatment/management • Two copies of plans and specifications, including: - Development/Project name - Engineer and firm -Legend - North arrow - Scale - Revision number & date - Mean high water line - Dimensioned property/project boundary - Location map with named streets or NCSR numbers - Original contours, proposed contours, spot elevations, finished floor elevations - Details of roads, drainage features, collection systems, and stormwater control measures - Wetlands delineated, or a note on plans that none exist - Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations - Drainage areas delineated Vegetated buffers (where required) VII. AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behalf, please complete this section. Designated agent (individual or firm): David A. Deel, 4uible & Associates, P.C. Mailing Address: PO Drawer 870 City:^ Kitty Hawk State: NC Zip: 27949 Phone:( 252 ) 261-3300 Fax: ( 252 Z 261-1260 VIII. APPLICANT'S CERTIFICATION 1, (print or type name of person listed in General Information, item 2) _D clviLe I F. _Sa" l., r, -Ir- , certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A NCAC 2H .1000. Signature: Date: a- Form SWU-101 Version 3.99 Page 4 of 4 Permit No. (to be provided by DWQ) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM LOW DENSITY SUPPLEMENT This form may be photocopied for use as an original A low density project is one that meets the appropriate criteria for built upon area and transports stormwater runoff primarily through vegetated conveyances. Low density projects should not have a discrete stonnwater collection system as defined by 15A NCAC 2H .1002(18). Low density requirements and density factors can be found in 15A NCAC 2H .1005 through .1007. I. PROJECT INFORMATION Project Name: Currituck County Law Enforcement Center Contact Person: David A. Deel Phone Number: ( 252 ) 261-3300 Number of Lots: 1 AIlowable Built Upon Area Per Lot*: 135,515 s f *If lot sizes are not uniform, attach a table indicating the number of lots, lot sizes and allowable built upon area for each lot. The attachment must include the project name, phase, gage numbers and provide area subtotals and totals. IL BUILT UPON AREA See the Stormwater Management Permit Application for specific language that must be recorded in the deed restrictions for all subdivisions. For uniform lot sizes, complete the following calculation in the space provided below where: • SA Site Area - the total project area above Mean High Water. Wetlands may be excluded when the development results in high density pockets. • DF Density Factor - the appropriate percent built upon area divided by 100. • RA Road Area - the total impervious surface occupied by roadways. • OA Other Area - the total area of impervious surfaces such as clubhouses, tennis courts, sidewalks, etc. • No. Lots - the total number of lots in the subdivision. • BUA/Lot - the computed allowable built upon area for each lot including driveways and impervious surfaces located between the front lot line and the edge of pavement. Form SWU-104 Rev 3.99 Page 1 of 2 (SA x DF)- RA - OA = BUA No. Lots Lot Calculation: 5A = 10.37 Ac. = 451,717 sf DF = 0.30 RA = N/A OA = N/A No. Lots = 1 BUA = 451,717 x 0.30 = 135,515 sf LOT 1 III. REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate that the following requirements have been met and supporting documentation is provided as necessary. If the applicant has designated an agent on the Stormwater Management Permit Application Form, the agent may initial below. Applicants Initials a. A 30 foot vegetative buffer is provided adjacent to surface waters. Projects in the Neuse River basin may require additional buffers. b. Deed restriction language as required on form SWU-101 shall be recorded as a restrictive covenant. A copy of the recorded document shall be provided to DWQ within 30 days of platting and prior to sale of any lots. c. Built upon area calculations are provided for the overall project and all lots. d. Project conforms to low density requirements within the ORW AEC (if applicable), [15A NCAC 2H 1007(2)(b)] Form SWU-104 Rev 3.99 Page 2 of 2 Permit No. (to be provided bY DWQ) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM INFILTRATION BASIN SUPPLEMENT This form may be photocopied for use as an original DWO Stormwater Management Plan Review: A complete stormwater management plan submittal includes a stormwater management permit application, an infiltration basin supplement for each system, design calculations, soils report and plans and specifications showing all stormwater conveyances and system details. I. PR—JjECT Ii TORNIATION Project Name Contact Person: Mr. Da er Phone Number: (252 ) 232-2242 This worksheet applies to: Basin No. 1 (as identified on plans) in Drainage Area 1 (from Form SWU-101) Ii. DESIGN INFORMATION - Attach supporting calculations/documentation. The soils report must be based upon an actual field investigation and soil borings. County soil maps are not an acceptable source of soils information. All elevations shall be in feet mean sea level (fmsl). Soils Report Summary Soil Type Infiltration Rate SHWT Elevation Basin Design Parameters Design Storm Design Volume Drawdown Time Basin Dimensions Basin Size Basin Volume Provided Basin Elevations Bottom Elevation Storage Elevation Top Elevation CnA 6-20 in/hr or cf/hr/sf (circle appropriate units) t 12.0' fmsl (Seasonal High Water Table elevation) 1 inch (1.5 inch event for SA waters,1 inch event for others) 5520 c.f. 1 days Varies ft. x 23,453 C.f. 14.0 fmsl 15.3 fmsl t 5.5 fmsl Varies ft = Varies sq. ft. (bottom dimensions) Fnrm .SW1T_1T1'3 RPv 1 00 Pnoe. 1 nr I III. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate that 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 W a. System is located 50 feet from class SA waters and 30 feet from other surface waters. O@D b. System is located at least 100 feet from water supply wells. DOO c. Bottom of system is at least 2 feet above the seasonal high water table. A(A O d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon. NO e. System is not sited on or in fill material or DWQ approval has been obtained. NZA f. 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. DAD g. Drainage area for the device is less than 5 acres. OPD h. Soils have a minimum hydraulic conductivity of 0.52 inches per hour and soils report is attached. jZn i. System captures and infiltrates the runoff from the first 1.0 inch of rainfall (1.5 inch event for areas draining to SA waters ). Design volume and infiltration calculations attached. LA 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. Calculations attached. k. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V). 1. A pretreatment device such as a catch basin, grease trap, filter strip, grassed swale or sediment trap is provided. Da m. Bottom of the device is covered with a layer of clean sand to an average depth of 4 inches or dense vegetative cover is provided. 114Za __ n. Vegeta_ted filter is. provided for overflow. and detail is shown on plans (Required minirnum length is 50 feet for SA waters, 30 feet for other waters). nAR_ o. Flow distribution mechanism within the basin is provided. p. A benchmark is provided to determine the sediment accumulation in the pretreatment device. /A q. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided). r. System is designed to -draw down the design storage volume to the proposed bottom elevation under seasonal high water conditions within five days. A soils report and all pertinent draw -down calculations are attached. s. 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. i Form SWU-103 Rev 3.99 Page 2 of 3 IV. INFILTRATION BASIN OPERATION AND MAINTENANCE AGREEMENT i . After every runoff producing rainfall event and at least monthly inspect the infiltration system for erosion, trash accumulation, vegetative cover, and general condition. 2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow vegetated cover to maintain a maximum height of six inches, and remove trash as needed. 3. After every runoff producing rainfall event and at least monthly inspect the bypass, inflow and overflow structures for blockage and deterioration. Remove any blockage and repair the structure to approved design specifications. 4. Remove accumulated sediment from the pretreatment system and infiltration basin annually or when depth in the pretreatment unit is reduced to 75% of the original design depth. The system shall be restored to the original design depth without over -excavating. Over -excavating may cause the required water table separation to be reduced and may compromise the ability of the system to perform as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream, etc.). A benchmark shall be established in the pretreatment unit. The benchmark will document the original design depth so that accurate sediment accumulation readings can be taken. The measuring device used to determine the depth at the benchmark shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the design depth reads feet in the pretreatment unit, the sediment shall be removed from both the pretreatment unit and the infiltration basin. `, if the Division determines that the system is failing, the system will immediately be repaired to original design specifications. If the system cannot be repaired to perform its design function, other stormwater control devices as allowed by NCAC 2H -1000 must be designed, approved and constructed. I acknowledge and agree by my signature below that I am responsible for the performance of the five 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. Print Name and Title: Dan Scanlon, Manager County of Currituck Address: En Rnx 39, Currituck, NC 27929 Date: Signature Note: The legally respo4sible 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, Mt7fLA�. i , a Notary Public for the State of _ Iva PAL , Pa r,21 i ki , County of do hereby certify that DO yA l ! F. personally appeared before me this 147L4 day of z , and acknowledge the due execution of the forgoing infiltration basin maintenance requirements. Witness my hand and official seal, .4/ SEAL My commission expires jutle , T ag0,1:112L Form SWU-103 Rev 3.99 Page 3 of 3 Treatment Stormwater runoff from proposed parking areas and travel aisles will be directed via paving surface grading to flow to the northern and western edge of the parking areas where it will pass through a 2' wide gravel shoulder where large particulates and debris will accumulate. This runoff will then flow overland into the proposed infiltration basins, passing across the vegetated infiltration basin side slopes. The basin bottoms will be grassed according to the general seeding specifications and maintained according to the operation and maintenance plan. The runoff will undergo filtration of fine particulates and pollutants by the vegetation within not only the basin and swale bottoms but also the basin and swale side walls which will also be seeded according to the general seeding specifications. The filtration by the vegetation is considered the primary treatment method. If the weather yields precipitation that exceeds the storage capability of the basin system then the accumulated runoff will overflow into an existing ditch system to the north of the property. It is unlikely during normal weather patterns, when considering storage volumes in conjunction with infiltration rates that the infiltration basins will ever over flow their boundaries. A secondary treatment method is also available when the stormwater runoff infiltrates into the subsurface. When the water passes through the void spaces between the particles of soil material particulates and pollutants that have a particle or grain size larger than the void size will be filtered out. In addition some pollutants will adsorb to the surface of the soil particles. The benefit of this adsorption will prevent the pollutants from reaching the water table and in some nutrient and microbe rich areas existing within the subsurface the pollutants will be consumed as food and undergo a natural biodegradation. Storage It should be noted that there is no storage requirement associated with the low density permit being applied for. However, since the land was readily available, and in the interest of minimizing flows from the site into the surrounding ditch systems, infiltration basins are being provided. This infiltration basin system will offer a portion of storage above the ground surface and a portion of storage within the void spaces available in the subsurface. The infiltration basins will offer storage in excess of the first 1 inch of runoff. The first I inch of runoff generated by all surfaces, pervious and impervious within the basin drainage areas will require approximately 5,520 ft3 of storage. The runoff generated by a 4.3 inch storm (which is widely recognized as the 10-year, 2-hour storm event for this area) will require 23,737 ft3 of storage. The storage available above the ground surface is 23,238 ft3. This storage value is equal to approximately 4.3 inches of runoff over all surfaces, pervious and impervious within the basin drainage areas. Additional storage is available within the subsurface in the two (2) feet of separation between the basin bottom and the seasonal high water table and the additional separation between the submerged basin side -slopes and the seasonal high water table. This subsurface storage will provide for an additional 10,740 ft3 of storage. The addition of the above ground storage and the subsurface storage is not quantified due to the fact that the above -ground storage noted above is roughly equivalent to the runoff generated by the 10-year, 2 hour storm (4.3 inches of runoff over all surfaces). Disposal The majority of stormwater runoff entering this management system will be infiltrated, therefore infiltration will be the primary source of disposal. The system has been designed with adequate storage so that this site will have the capability to handle a 4.3 inch, 10 year, 2 hour storm if such a weather event should occur. At such time that the capacity were to be exceeded the system will then overflow into adjacent Swale system to the north which will act as an emergency backup to this proposed system. Soils As per a geotechnical study by Geotechnical Environmental Testing Solutions, Inc., soils are comprised of mostly loose to medium dense fine sands and silty sands with very little slope overlaid with a layer of topsoil and rootmat within the top 8 inches of soil. Groundwater was encountered approximately 6 feet below existing grade (equivalent to an elevation of approximately 10.0'). These soils are well drained with moderate permeability. A copy of the boring logs from the aforementioned geotechnical study are included in the appendix of this narrative. RECEIVE® Stormwater Management Plan Narrative FEB 2 7 201;9 Currituck County Law Enforcement Center February 21, 2002 DWQ-W ARO General This project proposes the redevelopment 1 conversion of the existing Maple Prison as a Law Enforcement Center housing Highway Patrol, Detectives', and Magistrate's offices in conjunction with a County Detention Facility. The site is comprised of 10.37 acres of land situated immediately to the west of the Currituck County Airport on SR 1246 approximately 3840 feet north of the intersection of U.S. 158 and SR 1246. The project consists of conversion of an existing prison to a Law Enforcement Center, involving the demolition of several outbuildings, construction of one new small office building, additions and renovations to several existing buildings, and associated parking and utility improvements. The project site currently contains built - upon area of 47,041 square feet and proposes new built -upon area of 27,700 sf for a total built -upon area of 74,741 sf, or 16.5% of the project area. Therefore, the project is being developed as a "Low Density" development. The Stormwater Management Plan will utilize overland flow through vegetated buffers to provide filtration and collection in adjacent infiltration basins to provide infiltration of stormwater runoff generated by the proposed development. The following narrative will discuss specifically permissible built upon areas, Stormwater collection, treatment, and disposal, and a brief discussion of soils. Allowable Built Upon Area The Stormwater regulations allow for a maximum coverage of 30% for inclusion in the "low density" classification. The total land area used in calculations for this project is 10.37 acres. This area is comprised of one developable parcel. The total coverage proposed in the Stormwater Management Plan for this site is 1.72 acres (74,741 sf). The allowable coverage based on the 30% maximum allowable coverage as outlined in the NCDE & NR, DWQ, Administrative Code Section 15A NCAC 2H .1000 Stormwater Management for properties adjacent to SC waters is, 10.37 acres x 30%(.30) = 3.1 acres (135,515 sf ). Table I - Allowable Built Upon Area Parcel Parcel Area Lot Coverage Add'I Lot Total Lot (ft2) Proposed (ft2) Coverage .. Coverage Allowed (ft2) Allowed (ft2) Moyock Middle 451,717 ft2 74,741 ft2 60,774 ft2 135,515 ft2 School Stormwater Collection, Treatment, Storage, and Disposal Collection Stormwater runoff from proposed parking areas and travel aisles will be directed via paving surface grading to flow to the north and west where it will flow overland into a series of interconnected infiltration basins along the northern and western property lines. The soils found in the field are in general agreement with the United States Department of Agriculture, Soil Conservation Service, Soil Survey of Currituck County. According to the Soil Survey of Currituck County, the following soil types are predominant in the area of the proposed development according to Conetoe Loamy Sand, 0 to 3 percent slopes, moderately rapid permeability. Conclusion The stormwater management system proposed for the proposed Currituck County Law Enforcement Center will more than adequately serve this renovation project and provides controls above and beyond those which are prescribed by the project's low density classification. APPENDIX 5I tE APPENDIX ! - FIGURE I I NX, SAS F, ETBA L L 'OIL -DING -A k'f- T. 7 rZ -J.F k6- 3 *--Boring and core locations are approximate I I BORING AND CORE LOCATION PLAN PROJECT: Currituck Law Enforcement Center SCALE: N/A Currituck, North Carolina DATE:0911712001 PROJECT NO: 01-180G PLOTTED BY: WB CLIENT: Cederquist Rodriguez Ripley Maddux C, T &11111il.1315. I lW. APPENDIX n - m r q,'n ons, Inc. LOG OF BORING No. B'� PROJECT, Curl-ituck Law Enforcement Ccntcr - PROJECT NO.:lentat CLIENT: CedcrquistROdrifiuczRipleyMaddux PROJECT LOCATION: _Currituck, North Caroling LOCATION: See Attached Boring Location Sketch _ ELEVATION: NIA DRILLING METHOD: Rotary_Was� Mud) LOGGED BY CQTE G Stal9 iv01 DEPTH TO - WATER> INITIAL: $ 6 ft AFTER 24 NOURS: CAVING> •E• m Dine o Descriptton 19 E Zo iA b m V TEST RESULTS Plastic Limit Liquid Limit Water Content - • Penetration - 10 20 30 40 50 60 TO 4 3 3 3 a 4 s � 7 7 9 12 14 4.3 6-inches Topsoil 777 IZA 0.1 Reddish -Brown, moist, Silty SAND (SM) to poorly graded fine to medium SAND (SP-SM) with silt, very Ioose to loose 2 s Tan, moist, poorly graded fine to medium SAND (SP-SM) with silt to poorly graded fine to medium SAND (SP), loose to medium Clepse wct from 6 feet trace coarse sand from 18 feet r r y: [ is '• -'t F' aa.Ff ia. .1:Cc r 11:L1: ar :c�l r.):L•I: ,i • I' 1 r •i�ysrl .�Xrr 3 4 10 T 00 Boring terminated at 20 ft. zs �v 3b Figurer PAGE 1 of 1 �:. eo 'cal En ' ental a ons. Inc. LOG OF BORING No. B-2 J2 PROJECT: Currituck Law Enforccmcat Center PROJECT NO.: 01-18oG CLIENT: Cederquist Rodriguez Riplcy Maddux PROJECT LOCATION: CwTituck, North Carolina LOCATION: Sec Attachcd Baring Location Skctch ELEVATION: NIA DRILLER: Fishburne LOGGED BY: G. Stalis•E.1.T. DRILLING METHOD: Rotary Wash (Mud) DATE: 9/12/01 EPTH TO - WATER> INITIAL: �iP 6 ft AFTER 24 HOURS: = CAVING> f, a 67 o` bescri tiOfl- P E c M Z 0° U v TEST RESULTS Plastic Limit Liquid Limit Water Content - e Penetration . 10 20 30 40 50 60 70 T d s 6 e 12 a iz A 25 11 13 e to 4.0 8-inches Topsoil N. Reddish -Brown, moist, Silty SAND (SM) with trace clay, loose 2 Reddish -grown, moist, poorly graded fine to medium SAND (SP- SM) with silt to poorly graded fine to medium SA.NL D (SP), loose to dense wet from 6 feet- gray from 13 feet • F 1• 1 �: ? [ .i ri r t �:C r i l!:t). 1: is ( C Ili f1:t1; t4:ij. :6: 0 2 3 s 4 5 10 1s 6 7 29 Boring terminated at 20 ft, �5 30 35 Figure PAGE 1 of 1 d E ental ons, Inc. LOG OF BORING NO. B-3 PROJECT: Currituck Law Enforcement Ccntcr PROJECT NO.: 01-18OG CLIENT; Ccdcrquist Rodriguez Riplcy Maddua PROJECT LOCATION: Cunituck Noah Carolina LOCATION: See Attached Boring L9CariOn Sketch _ ELEVATION: N/A DRILLER: Fishburne .w LOGGED BY; G, Stalls, E.I.T. DRILLING METHOD: Rotary wash(Mud) DATE: 9/12101 DEPTH TO - WATER> INITIAL: 4 6 [t AFTER 24 HOURS: CAVING> L a� ❑ Description a o e z , 0 o m 3 V TEST RESULTS Plastic Limit F 1 Liquid Limit Water Content - • Penetration - IL 20 30 40 50 6 70 7 a 4 3 n a , 3 6 4 10 1s tz n arf 10 is 4-inches Topsoil LA 1111/1 _3 Brown -Tan, moist, poorly graded fine to medium SAND (Sp-SM) with silt, mixed with gravel and organics (FILL) 2 3 1. Tan, moist, poorly graded fine to medium SAND (SP-SM) with silt to poorly graded fine to mcdium SAND (SP), loose to medium dense wet from 6 feet Gray -Tan from 6 feet Gray from 18 feet s 4 >0 5 5 is 20 7 Boring terminated at 20 ft 25 30 35 Figure PAGE 1 of 1 ental 4ons' Inc. LOG OF BORING NO. B-4 PROJECT: Currituck Law Enforcement Ccnter PROJECT NO.: O1-I BOG CLIENT: Ccdcr isr t RodriSuez Riylcy Maddux PROJECT LOCATION: Cur6tuck. North Carolina LOCATION: Set Attschcd Boring Location Skh teh ELEVATION: N/A DRILLER: i:isbbumc _ LOGGED BY: - G. Stalls, E.I.T. DRILLING METHOD: Rotary wash (Mud) DATE: 9112101 DEPTH TO - WATER> INITIAL: -i� 6 ft AFTER 24 HOURS: ,r CAVING L a m m Description a � c E Z ca � � rn 1j v TEST RESULTS Plastlt Limit j I Liquid Limit Water Content - • Penetration - 10 20 30 40 54 60 7 3 3 3 s 4 4 s 13 10 7 6 3 7 a 9 s 11 15 a.3 6-inches Topsoil WV 77,71 ° i:llf j Tan -Brown, moist, poorly graded fine to medium SAND (SP-SM) with silt and trace organics, loose i :�. j '• { -�' F •?' ' �= r Fa.h a• i • i; t �; i [ .1:Ct r 7:i:ti1 •-1a:[r rh;ii• -i_•r F � - 't7; t!. :1:� t < 2 Reddish -Brown moist, poorly p y graded fine to mcdium SAND (SP- SM) to poorly graded fine to medium SAND (SP), loose to medium dense wet from 6 feet s 4 10 13 Gray, wet, Silty fine SAND (SM) with trace clay, medium dense g 15 1 Tan -Gray, wet, poorly graded fine to medium SAND (SP-Slv with silt, medium dense 7 �0 Boring terminated at 20 ft. 25 30 35 Figure PAGE 1 of 1 m EeO r ntal n e '' Lions, Inc. LOG OF BORING NO. C`1 PROJECT: Cunituck law Enforcement Centex PROJECT NO.: 01-18OG CLIENT: Ced uist Rodriguez Ripley Maddux PROJECT LOCATION: Currituck. North Carolina LOCATION: See Attached Boring Location Sketch ELEVATION: N)A DRILLER: G.Stalls F.I.T, LOGGED BY: G. Stalls• E.I.T, DRILLING METHOD; Eland Auger DATE, 9/17101 lXPTH TO -WATERS INITIAL: $ 6 ft AFTER 24 HOURS: = CAVING> L n v ❑QSCCIptinr] u a o is V as C" V TEST RESULTS Plastic Umit Liquid Limit Water Content - • Penetration - 10 20 30 40 50 50 7 3.0 inches Concrete F i; I�I�Ci .:I, t't: r Z .2 Brown, moist, Silty fine SAND (SM) with trace brick and gravel (FILL,), loose to medium dense Reddish -Brown, moist, poorly graded fine to medium SAND (SP- SM) to poorly graded fine to medium SAND (SP), loose to medium dense Tan from 5 feet wet from 6 feet s Boring terminated at 7 ft. 10 15 20 ZS 3P 35 Figure PAGE 1 of 1 �,. Ncal kwnw "'k : Lions. Inc. LOG OF BORING NO. C-2 PROJECT: Currituck Law Enforcement Center PROJECT NO.: 01-18OG CLIENT: _CudcTqui5tRodriLue7RiplcyMaddtLx „., PROJECT LOCATION: Currituek, Nonh Carolina LOCATION: See Attached Boring Location Skctnh _ ELEVATION: NIA DRILLER: G.Stalls, E.I.T. LOGGED BY: G. Sulfa, E.I.T. DRILLING METHOD: Hand Aur _ DATE: 9117l01 DEPTH TO - WATER> INITIAL: $ 6 ft AFTER 24 HOURS: CAVING> L r� m d= DesCClpti0rl R CODm m E Wo .120 t j sz TEST RESULTS Plastic Llmit t Liquid Limit Water Content - • Penetration - 10 20 30 40 50 60 70 3.5 inches Concrete �' t 't 1: t 7 i t I .2 Tan -Brown, moist, Silty fine SAND (S1) with trace metal and gravel (FILL), loose to medium dense Reddish -Brown, moist, poorly graded fine to medium SAND (SP- SM) to poorly graded fine to medium SAND (SP), loose to medium dense wet from 6 feet s Boring terminated at 7 ft. is 15 TQ 25 3o 35 Figure PAGE 1 of 1 TOTRL P.10 QUIBLE & ASSOCIATES, P.C. joB 00 17 2 - Lut f. Lo w Lt%,;'. C i - . P.O. Drawer 870 SHEET No. / - OF KITTY HAWK, NC 27949 CALCULATED BY - P - i) DATE (252) 261-3300 Fax (252) 261-1260 e-mail: quible@mindspring.com CHECKED BY DATE crAl P .............. . ... .. ...... .... 7^J. QUIBLE & ASSOCIATES, P.C. P.O. Drawer 870 KITTY HAWK, NC 27949 (252) 261-3300 Fax (252) 261-1260 e-mail: quible@mindspring.com JOB no 17 2 tovy or. - _s iA ) tn SHEET NO. a -_ OF _? CALCULATED BY DATE CHECKED BY DATE .1.1 . . .. ...... .. .. .. ......... . ......... . . ...... . . . ......... ............. . ........... ......... . ........... .. ... ..... . .. ...... ....... .. . . ............... . ..... .. ...... .. ... .. . ...... ... . ..... . .. ........... ..... .. .... 1ft1td7.0j'V . .. ......... .. ..... ... ... ..... .. .. .......... .... .. . .. ............ ve 0 ........ .. ..... j �ED ............. . ........... ............ ........... ............. ......... . ............ I. . ...... ............ . . ....... .............rJ .......... . .. FEB 7": 00:2 ...... .. .. J. ...... .... .... .. ..... 31A 7 Q!W R: ..... .. .... :1 ..... .. ... .. ......... .. .. .............. . .. .. .. ...... . ............ . .j QUIBLE & ASSOCIATES, P.C. P.O. Drawer 870 KITTY HAWK, NC 27949 (252) 261-3300 Fax (252) 261-1260 e-mail: quible@mindspring.com JOB 00172 -Luir. jor,; Lf Cfr. - 5(A)M SHEET NO. ff-3 — — OF UL CALCATED BY 0/�6 1 J DATE CHECKED BY DATE ccai F