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Home My WebLink AboutSW8050405_COMPLIANCE_20100218STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE COMPLIANCE EVALUATION INSPECTION DOC DATE YYYYMMDD State Stormwater inspection Report General Project Name: Laurel Woods Permit No: SW8050405 Expiration Date: Contact Person: Phone Number: Inspection Type: Inspection Date: 2-18-2010 Time In: 2:05 Time Out: 2:10 Current Weather. Clear Recent Rain (Date)? Rain — in Location Facility Address 1 Location:Muarryville Rd. City: MuarryviIle Zip: County:NH Lat: a"N Long: - 0"W Permit Information Rule Subject to (circle one): 1988 Coastal Rule 1995 Coastal Rule 2008 Coastal Rule Session Law 2006-246 Goose Creek High Quality Waters Outstanding Resource Waters Density (circle are): High (HD) Low (LD) ' Stormwater Best Management Practices (BMPs) (insert number of each): Wet Ponds Infiltration Basins Infiltration Trenches LD Swales Stormwater Wetlands Dry Ponds Bioretention Permeable Pavement Sand filters (circle one) Open Closed Cistern Level Spreader/Filter Strip Other (spec): File Review Yes No NIA NIE 1. Is the permit active? x 2. Signed Engineer's Certification on file? X 3. Signed Operation and Maintenance agreement on file? X 4. Recorded Deed Restrictions on file? X Site Visit: Built Unon Area (BUA) Yes No NIA NIE 5. BUA is constructed and consistent with the permit requirements? X 6. BUA (aspermitted) is graded such that the runoff drains to the system? (high density only) X 7. Drainage area is consistent withpermit? (i.e. no un ermitted drainage to the SW BMPs) X 8. Drainage area is stabilized? (to reduce risk of sedimentation to the SW BMPs) X Site Visit: Stormwater SMPs Yes No NIA NIE 9. Stormwater BMPs are located per the approvedplans? X 10. Stormwater BMPs have dimensions e . length, width, area matching the approvedplans? X 11. Stormwater BMPs are constructed per the approvedplans? X Site Visit: Oneration and Maintenance Yes No NIA NIE 12. Access points to the site are clear and well maintained? X 13. Trash has been removed as needed? X 14. Excessive landscape debris (grass clippings, leaves, etc) is controlled? X 15. Stormwater BMPs being operated and maintained as per the permit requirements? X 16. Inspection and Maintenance records are available for inspection? (high density only, 1995 — present only X Site Visit: Other Permit Conditions Yes No NIA NIE 17. Is the site compliant with other conditions of thepermit? Site Visit: Other Water Quality Issues Yes No NIA NIE 18. Is the site compliant with other water ualit issues as noted during the inspection? State Stormwater Inspection Report, Version 3.0_3-09 Page I of 3 State Stormwater Inspection Report Laurel Woods never constructed. Instead NH County Firestation. InS ection Pictures (some of the pictures taken during the site visit) Compliance Status ❑ Compliant ❑ Non -Compliant Letter Sent (circle one). Yes oNo Letter type: CEI NOV NOVRE Other Date Sent: Reference Number: C 2 h/0 , �V,_ Inspector Name and Signature: )/jI q2 Date:2/ State Stormwater Inspection Report, Version 3.0_3-09 Page 2 of 3 State Stormwater Inspection Report WET DETENTION O & M Inspection Checklist YES NO NIA NE INLETS and FOREBAY . Inlets are located per the approved plans: ❑ ❑ ❑ ❑ 2. Inlet device (swale or pipe) is free of damage, clogs or erosion: ❑ ❑ ❑ ❑ 3. Forebay berm is in place and without erosion: ❑ ❑ ❑ ❑ 4. Forebay is free of excessive sediment: ❑ ❑ ❑ ❑ SIDE SLOPES AND BANKS 5. Vegetated slopes are 3:1 or less: ❑ ❑ ❑ ❑ 6. Banks are stable and free of erosion or bare soil: ❑ ❑ ❑ ❑ 7. Slopes or berms are free of woody vegetation: ❑ ❑ ❑ ❑ 8. Free of muskrats or beaver activity: ❑ ❑ ❑ ❑ 9. Grass is being maintained and mowed (not scalped) as required: ❑ ❑ ❑ ❑ PERIMETER AND MAIN BAY 10. Vegetated shelf is 6:1 or 10:1 as permitted and properly vegetated: ❑ ❑ ❑ ❑ 11, Algal growth covers less 50% of the area: ❑ ❑ ❑ ❑ 12. Cattails, phragmites or other invasive plants cover less than 50% of the basin surface: ❑ ❑ ❑ ❑ 13. Main treatment area is free from excess sediment accumulation: ❑ ❑ ❑ ❑ OUTLETS 14. Swale or emergency outlet bypass is in the correct place and is in good condition: ❑ ❑ ❑ ❑ 15. Drawdown device is correctly sized free of damage or clogging: ❑ ❑ ❑ ❑ 16. Orifice size matches the approved plans ❑ ❑ ❑ ❑ 17. Outlet is free of erosion or other signs of damage: ❑ ❑ ❑ ❑ 18. Trash rack is installed ❑ ❑ ❑ ❑ 19. Vegetated filter is in place (if applicable) ❑ ❑ ❑ ❑ 20. Relative elevations match approved plans ❑ ❑ ❑ ❑ 2 t. Fountain pump (if permitted) is less than or equal to the maximum allowable size: ❑ ❑ ❑ ❑ State Stormwater Inspection Report, Version 3.0_3-09 Page 3 of 3 INFILTRATION BASIN ANALYSIS PROJECT NUMBER: SW8 050405 PROJECT NAME: Laurel Woods Subdivision DRAINAGE BASIN: Cape Fear RECEIVING STREAM: Smith Creek Index No.: 18-74-63 -r SITE AREA 7.79 acres IMPERVIOUS AREA CALCULATION BUILDINGS 33 lots @ 4K ft2 ea PARKING/ASPHALT CONCRETE OTHER TOTAL % IMPERVIOUS, I= €a % ELEVATION OF SEASONAL HIGH WATER TABLE REPORTED INFILTRATION -.RATE SURFACE AREAS AND ELEVATIONS FILENAME: S:1WQSIINBASINISW8 050405.WK1 DATE: 29-Apr-05 REVIEWER: P.Bartlett CLASS: C;Sw If ORW, is site within the 575' AEC? DRAINAGE AREA: Rational C 132,000 0.95 25,415 0.95 2,868 0.95 Paz C Elev. (ft) Area, sq ft Inc. Volume Acc. Volume BOTTOM 34 18,135 34 18,135 0 0 � 36.5 23,001 5142 51420 O' r ®' Sill-.4 TOP 37 5750.25 57170.25 VOLUME 1 DEPTH 1 DRAWDOWN CALCULATION DESIGN STORM, INCHES DESIGN VOLUME TOTAL VOLUME AVAILABLE DEPTH OF RUNOFF TIME TO DRAWDOWN 25 YEAR 24 HOUR STORM-, N/A Intensity, i =".33 inches 1 hour Qr=CiA= Qp through the bottom of the basin= 10 YEAR 10 MIN HIGH INTENSITY EVENT Intensity, i = 6.3 inches 1 hour Volume for 10 yr. 10 min. event = € do3.05 CUBIC FEET €€5711:7.025 CUBIC FEET ii630 FEET a03,' HOURS 1.42 CFS 2.52 CFS 16320.87 CF < COMMENTS Volume and drawdown are within Design Requirements. 0-�- 0-0 4 I �J1°f vs 3'1, 4 zo �rla'e-r{ , MUST BE <120 Must be > Qr 57170.25 CF N INFORMATION PERTAINING TO DEED RESTRICTIONS . AND PROTECTIVE COVENANTS �y O In accordance with Title 15 NCAC 2H.1000, the Coastal Stormwater Management Regulations, deed restrictions and protective covenants are required for High Density Residential Subdivisions where lots will be subdivided and sold. Deed restrictions and protective covenants are necessary to ensure that the development maintains a "built -upon" area consistent with the design criteria used to size the stormwater control facility. The following deed restrictions and covenants must be recorded prior to the sale of any lot: The following covenants are intended to ensure ongoing compliance with State Stormwater Management Permit Number , as issued by the Division of Water Quality under NCAC 2H.1000. S 2 7 2. The State of North Carolina is made a beneficiary of these covenants to the extent necessary to maintain compliance with the stormwater management permit. 4-3.. These covenants are to run with the land and be binding on all persons and parties claiming under them. S 2- �'4. The covenants pertaining to stormwater may not be altered or rescinded without the express written consent of the State of North Carolina, Division of Water Quality. -2. L, 5. Alteration of the drainage as shown on the approved plan may not take place without the concurrence of the Division of Water Quality. 6. The maximum allowable built -upon area per lot is KV square feet. This allotted amount includes any built -upon area construe ed within the lot property boundaries, and that portion of the right-of-way between the front lot line and the edge of the pavement. Built upon area includes, but is not limited to, structures, asphalt, Sec Z i concrete, gravel, brick, stone, slate, coquina and parking areas, but does not include raised, open wood decking, or the water surface of swimming pools. Note: If the BUA per lot varies, please substitute the following paragraph for the one above and provide a complete listing of the proposed BUA for each lot: The maximum allowable built -upon area per lot is as follows: Lot # '.'BUA Lot # BUA Lot # BUA These allotted amounts include any built -upon area constructed within the lot property boundaries, and that portion of the right-of-way between the front lot line and the edge of the pavement. Built upon area includes, but is not limited to, structures, asphalt, concrete, gravel, brick, stone, slate, coquina and parking areas, but does not include raised, open wood decking, or the water surface of swimming pools. 7. All runoff from the built -upon areas on the lot must drain into the permitted system. This may be accomplished through a variety of means including roof drain gutters which drain to the street, grading the lot to drain toward the street, or grading perimeter swales to collect the lot runoff and directing them into a component of the stormwater system. Lots that will naturally drain into the system are not required to provide these additional measures. 416l2005 Laurel Woods 04107 MBH Stormwater Infitration Basin 25-year Storm WATERSHED DATA Total Drainage Area s . ft. acres 339,343 7.79 Impervious Area Land Use s . ft. acres Bl1A (4,000 sfllot) 132,000 3.03 road 25,415 0.58 sidewalk 2,868 0.07 Total 160,283 3.68 INFILTRATION SYSTEM: Rv= 0.48 hiin Design Rainfall= 3 in % impervious = 0.472 = 47.2% say 47.2% CPRE = 0.25 CPOST = (% imp.)(.95)+(1-% imp.)(.25) 0.59 12 = 5.06 inlhr 110 = 6.30 h1hr 125 = 7.13 tnlhr Volume offrrstinch an a halfofrunoff = (Design rainfail) (Rv) (Drainage Area) V= 40,305 cu-€t Volume provided.- (L"W'D') Area (sO Efevation(ff) Va = 51,420 cu-ft Bottom: 18,135 34.00 Flood: 23,001 36.50 ORAWDOWN RATE: RATE OF INFILTRATION 6 iN1HR DEPTH OF BASIN: 30 IN DRAW DOWN RATE: 5.00 HRS ♦%'011I11 ii111,CA �' �.%�=04�p��5S SEAL 17374 EGOR�*�`� [CEX�TF� APR 1 1 2005 BY: APR 06,2005 08:49A Tripp Engineering 9107635631 Yt J )ob No. 0l Date: 5 TRIPP ENGINEERING, P.C. 419 Chestnut Street, Wilmington, NC 28401 Phone: (910) 763-5100 - FAK (910) 763-5631 Email: trippeng@ec.rr.com LETTER OF TRANSMITTAL To: NIM ' Attention: If A& L&LIS _ Subject: —1_&( [LCA UL611—Yl] �. FAX TRANSMITTAL: NUMBER OF PAGES INCLUDES COVER I am sending you: ( ) ATTACHED ( ) UNDER SEPARATE COVER ( ) Prints ( ) Tracings ( ) Copy of letter ( ) Specifications ( ) Other These are transmitted as checked below: ( ) For Approval ( ) For Your Use ( ) Sign & Return ( ) Review cc: —7Am /1(_y G) page 1 ;. APR 06,2005 08:49A Tripp Engineering 9107635631 page 2 INFILTRATION SITE VISIT REQUEST Name of the Project : Laurel Woods Location (attach a clear vicinity map):northw ast side of the intersection of Murry villa Rd and Knotty Ct. Street address, 5R number, community, etc. Directions from the nearest major intersection: Travel east from the intersection of Murrayville Road and 14wv 132 approximately 2,000 If. Site is on left- o wner/Applicant Name: Brunswick Properties, LLC Consultant Name: TrippEn ineerin Consultant Contact Information: 910-763-5100 : fax 763-5631; charlie-trippeng@ec.rr.com Phone, fax, email, etc. #1 #2 #3 #4 #5 #6 #7 #8 Existing ground elev. @basinitrench= 37.0 Bottom Elev. of infiltration basin/trench= 34.0 Existing ground minus bottom elev.= 3.0 �bc.r4y_ ate,Add 2' (max. o anon)= 5.0 Date[Time of Soils Investigation : Summary/Comments: N �01n (Vi/1C2nf WlffCC.14-m) All proposed infiltration areas and existing, active utility lines located within the proposed basin/trench must be marked and flagged_ If these areas are not flagged, the Soils Scientist reserves the right to decline to do the investigation. If the proposed infiltration system will be located in an area of existing pavement and there is no open area nearby, equipment capable of breaking through the impervious layer must be provided_ The soils investigation does not take the place of a soils report prepared by an appropriate professional, The Soils Scientist will only verify the soil conditions that are reported in the Soils Report, and make a determination as to the suitability of the site to meet the infiltration design requirements under NCAC 2H.1000, and assumes no liability should the system fail. ro APR 06,2005 08:49A Tripp Engineering 9107635631 page 3 G.accrd Wood's 1 VICINITY MAP NTS If ,rA Zj 7/0 � T b� APR 06,2005 08:49A Tripp Engineering 9107635631 ip page 2 r' INFILTRATION SITE VISIT REQUEST Name of the Project : Laurel Woods Location (attach a clear vicinity map):north est side of the intersection of Murrayville Rd and _Knotty Ct. Street adduss, SR number, community, etc. Directions from the nearest major intersection: Travel east from the intersection of Murrayville Road and Hwyl32 approximately 2.000 If Site ig on left_ Owner/Applicant Name: Brunswick Properties, LLC Consultant Name: TrippEngineering Consultant Contact Information: 910-763-5100: fax 763-5631; charlie-trippeng@gc,rr.eom Phone, tax, email, etc. #1 #2 #3 #4 #5 #6 #7 #8 Existing ground elev. @basin/trench= 37.0 Bottom Elev, of infiltration basin/trench= 34.0 Existing ground minus bottom elev.= 3.0 bcr ci ep+h Add 2' (max. bot#ewn}= 5.0 Date/Time of Soils Investigation : HaIj Summary/Comments: `W 4.t v t4 6/F (�6 � I om (V;'IC?,i f ftWr1�C6.7fi�m) O 'Z Sa hQ a v t rG 6. 7 soh All proposed infiltration areas and existing, active utility lines located "within the proposed basinitrench must be marked and flagged. If these areas are not flagged, the Soils Scientist reserves the right to decline to do the investigation. if the proposed infiltration system will be located in an area of existing pavement and there is no open area nearby, equipment capable of breaking through the impervious layer must be provided_ The soils investigation does not take the place of a soils report prepared by an appropriate professional. The Soils Scientist will only verify the soil conditions that are reported in the Soils Report, and make a determination as to the suitability of the site to meet the infiltration design requirements under NCAC 2H.1000, and assumes no liability should the system fail. APR 06,2005 03:19A Tripp Engineering 9107635631 0;& page 3 Lawrd NO()d.S 1, VICINITY MAP NTS