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Home My WebLink AboutSW6231104_Supplement-EZ Form_20240221 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 ProJect Name Tractor Supply Store-West End 2 Project Area(ac) ----. '64e.to■tl1 3 Coastal Wetland Area ac _ 0 4 Surface Water Area(ac) - — - 0 5 Is this project High or Low Density? _ High _6 Does this project use an off-site SCM? I no (COMPLIANCE WITH 02H.1003(4) 7 Width of vegetated setbacks provided(feet) 30-ft ' 8 Will the vegetated setback remain vegetated? Yes 9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? N/A 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 1-- 11 Infiltration System 1 12 Bioretention Cell 13 iWet Pond 14 Stormwater Wetland 15 Permeable Pavement 16 Sand Filter 17 Rainwater Harvesting(RWH) 18 Green Roof 19 Level Spreader-Filter Strip(LS-FS) — - 20 Disconnected Impervious Surface(DIS) - 21 ,Treatment Swale 22 Dry Pond —_ „_- 23 StormFilter 24 Silva Cell 25 Bayfilter 26 Filterra FORMS LOADED DESIGNER CERTIFICATION r 27 Name and Title: i J. Branch Smith,PE 28 Organization: 1 Paramounte En ineerin Inc. 29 Street address: 122 Cinema Drive 30 City,State,Zip_ _ Wilmington,NC 28409 31 Phone number(s):Email: 910-791-6707 32 , _ bsmith@paramounte-eng.com Certification Statement: I certify,under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or supervision:that the information provided in the form is,to the best of my knowledge and belief,true,accurate,and complete;and that the engineering plans, specifications,operation and maintenance agreements and other supporting information are consistent with the Information provided here. Designer 0011111//, O 4SSj••../4/ ,, n2� .'0 Oti'.. % Signa re of Designer :CL SEAL _ — 034354 . / LS//°RANCN�\\ / /q/2� /r i'JW 1\\ E ate DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 1 3 Does this project have low density areas? No 4 If so, number of low density drainage areas 0 Is all/part of this project subject to previous rule 5 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 4 Type of SCM PROJECT AREA Infiltration Basin 5 Total drainage area (sq ft) 267458 221500 6 Onsite drainage area (sq ft) 267458 221500 7 Offsite drainage area (sq ft) 0 0 8 Total BUA in project(sq ft) 139300 sf 139300 sf New BUA on subdivided lots (subject to permitting) 9 (sq ft) .0 sf .0 sf New BUA not on subdivided lots (subject to 10 permitting) (sf) 139300 sf 139300 sf 11 Offsite BUA (sq ft) .0 sf .0 sf 12 Breakdown of new BUA not on subdivided lots: - Parking (sq ft) 84100 sf 84100 sf -Sidewalk (sq ft) 28000 sf 28000 sf - Roof(sq ft) 22200 sf 22200 sf - Roadway(sq ft) - Future(sq ft) 5000 sf 5000 sf - Other, please specify in the comment box below (sq ft) .0 sf .0 sf New infiltrating permeable pavement on subdivided 13 lots (sq ft) -New infiltrating permeable pavement not on 14 subdivided lots(sq ft) - - Existing BUA that will remain (not subject to 15 permitting) (sq ft) - - 16 Existing BUA that is already permitted (sq ft) - - 17 Existing BUA that will be removed (sq ft) 2000 sf 2000 sf 18 Percent BUA 52.10% 62.90% 19 Design storm (inches) 1.50 in 20 Design volume of SCM (cu ft) 17056 cf 21 Calculation method for design volume Simple ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): INFILTRATION SYSTEM Drainage1 area number 2 ,. 2 Minimum required treatment volume(cu ft) 1 GENERAL MDC f ROM 0211.1050 3 — Is the SCM sized to treat the SW from all surfaces at build-out? Yes 4 Is the SCM located away from contaminated soils? Yes 5 What are the side slopes of the SCM(H:V or enter"Vertical"for trenches)? 4:1 6 Does the SCM have retaining walls,gabion walls or other engineered side slopes? No 7 Are the inlets.outlets,and receiving stream protected from erosion (10-year storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes 9 What is the method for dewatering the SCM for maintenance? Pump(preferred) 10 If applicable,will the SCM be cleaned out after construction? Yes 11 Does the maintenance access comply with General MDC(8)? Yes 12 Does the drainage easement comply with General MDC(9)? Yes 13 If the SCM is on a single family lot,does(will?)the plat comply with N/A General MDC(10)? 14 Is there an O&M Agreement that complies with General MDC(11)? Yes 15 Is there an O&M Plan that complies with General MDC(12)? Yes 16 Does the SCM follow the device specific MDC? Yes 17 Was the SCM designed by an NC licensed professional? Yes INFILTRATION SYSTEM MDraom 03N.1Q55 18 Proposed slope of the subgrade surface(%) 0% 19 Are terraces or baffles provided? No 20 j Type of pretreatment: Other Salk Data 21 Was the soil investigated in the footprint and at the elevation of the infiltration system? Yes 22 SHWT elevation(fmsl) _ 577.50 23 Depth to SHWT per soils report(in) 240.00 24 Ground elevation at boring in soils report(fmsl) 597.50 25 Is a detailed hydrogeologic study attached if the separation is between 1 and 2 feet? N/A 26 Soil infiltration rate(in/hr) 3.37 27 Factor of safety(FS) (2 is recommended): 2.00 Elevations 29 Bottom elevation(find) 585.00 ft 30 Storage elevation(fmsl) 588.3 ft 31 Bypass elevation(fmsl) 594.00 ft For Basins Only 32 Bottom surface area(ft2) 2850 ft 33 Storage elevation surface area(ft2) 7400.ft For Trenches Only 34 Length(ft) na 35 Width(ft) 36 Perforated pipe diameter,if applicable(inches) 37 Number of laterals 38 Total length of perforated piping 39 Stone type,if applicable 40 Stone porosity(%) 41 Is stone free of fines? 42 Is the stone wrapped in geotextile fabric? _ 43 Has at least one inspection port been provided? VolumeslDrawdown 44 Design volume of SCM(cu ft) 17056 cf 1 45 Time to draw down(hours) 43 Itrs ADDITIONAL INFORMATION Please use this space to provide any additional information about 46 the infiltration systems)._ __— Line 20 Pretreatment is 12"sumps in each storm basin. See plans and details. Infiltration 1