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HomeMy WebLinkAboutSW1240201_Supplement-EZ Form_20240227 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name Horsepasture River Wastewater Treatment Plant&Collect 2 Project Area(ac) 16 3 Coastal Wetland Area(ac) 0 4 Surface Water Area(ac) 0.99 5 Is this project High or Low Density? High 6 Does this project use an off-site SCM? No COMPLIANCE WITH 02H.1003(4) 7 Width of vegetated setbacks provided(feet) 25 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)? Yes 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 12 Bioretention Cell 13 Wet Pond 14 Stormwater Wetland _ 1 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 DryPond 23 Storm Filter 24 Silva Cell 25 Bayfilter 26 Filterra FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Scott Burwell 28 Organization: McGill Associates PA 29 Street address: 55 Broad Street 30 City,State,Zip: Asheville,NC 28805 31 Phone number(s): 828-252-0575 32 Email: scott.burwell@mcgillassociates.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 \\\��1ltlllli�li�// �` \ ,� CAROB//,��� • o� •.•• SS/6 1 AZ( — SEAL _ Signature of Designer 039177 = . '//,,,E.tBU,`���`�� 2-la0, 2 LI Seal Date 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 C FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 4 Type of SCM Wetland Wetland 5 Total drainage area(sq ft) 697600 164189 6 Onsite drainage area(sq ft) 697600 164189 7 Offsite drainage area(sq ft) N/A N/A 8 Total BUA in project(sq ft) 72410 sf 72410 sf New BUA on subdivided lots(subject to 9 permitting)(sq ft) N/A N/A New BUA not on subdivided lots(subject to 10 permitting)(sf) 11 Offsite BUA(sq ft) N/A N/A 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) 324 sf 324 sf -Sidewalk(sq ft) sf sf -Roof(sq ft) 7184 sf 7184 sf -Roadway(sq ft) 59348 sf 59348 sf -Future(sq ft) 9533 sf 9533 sf -Other,please specify in the comment box below(sq ft) 3205 sf 3205 sf New infiltrating permeable pavement on 13 subdivided lots(sq ft) N/A N/A New infiltrating permeable pavement not on 14 subdivided lots(sq ft) N/A N/A Existing BUA that will remain(not subject to 15 permitting)(sq ft) N/A N/A 16 Existing BUA that is already permitted(sq ft) N/A N/A 17 Existing BUA that will be removed(sq ft) N/A N/A 18 Percent BUA 10% 44% 19 Design storm(inches) 1.0 in 1.0 in 20 Design volume of SCM(cu ft) 4790 cf 4790 cf 21 Calculation method for design volume Discrete NRCS Discrete NRCS ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): Other includes equipment pads,process equipment,etc.The wetland has been designed to account for all of the impervious area on the entire site (including future BUA),not strictly what is flowing to it.This has created a more conservative design. STORMWATER WETLAND 1 Drainage area number 2 Minimum required treatment volume(cu ft) GEN ERM.MDC FROM 0211.1050 ' ••• -; 3 Is the SCM sized to treat the SW from all surfaces at build-out? '" :Wei I • 4 Is the SCM located away from contaminated soils? 5 What are the side slopes of the SCM(FIN)? 6 Does the SCM have retaining walls,gabion walls or other • N • engineered side slopes? O• Are the Inlets,outlets,and receiving stream protected from erosion .7 yes (10-year storm)? . . 8 Is there an overflow or bypass for inflow volume in excess of the • •, .• design volume? 9 What is the method for dewatering the SCM for maintenance? Drawdown OnTiqe • 10 if applicable,wilt the SCM be cleaned out after construction? 11 Does the maintenance access comply with General MDC(8)? 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)? r' Yes 16 Does the SCM follow the device specific MDC? 17 Was the SCM designed by an NC licensed professional? Yes STORMWATER WETLAND MDC FROM RR.1054 ,*>"'T • -,. I 18 Design volume of SCM(cu ft) 9758 Are the inlet(s)and outlet located in a manner that avoids short- ' yes 19 circuiting? 20 Are berms or baffles provided to improve the flow path? Does the orifice drawdown from below the top surface of the 21 permanent pool? 22 Does the wetland minimize impacts to the receiving channel from the • 1-yr,24-hr storm? es . . 23 Is a trash rack or other device provided to protect the outlet system? Yes- .-.• • ElevadonS . . . Elevation,peak attenuation above temporary pool(if applicable) • 3193.00 •24(fmsl) . . Elevation,temporary pool(top of the temporary inundation zone) 25(fmsl) 3192.00 26 Elevation,permanent pool(top of the shallow water zone)(fmsl) 3190.75 27 Elevation,bottom of shallow water zone(fmsl) 3190.00 :• 28 •Elevation,bottom of forebay deep pool at deepest point(at forebay — 3180.uu entrance)(fmsl) Elevation,bottom of forebay deep pool at shallowest point(at 3190.00- 29 forebay exit)(fmsl) 30 Elevation,bottom of non-forebay deep pool at deepest point(fmsl) 3187.50 . • Mandng Zones Area,total surface area of the SW wetland at temporary pool elev ' • ' 31 8 573.00 — • (sq ft) 32 Area,temporary inundation zone at temporary pool elev,(sq(t) 2,974.00 33 Area,shallow water zone at temporary pool elev.(sq ft) 34 Area,forebay at temporary pool elev.(sq ft) 35 Area,non-forebay deep pool at temporary pool elev.(sq ft) 1,250.00, Percent area provided,temporary inundation zone(should be 30 36 45%) 37 Percent area provided,shallow water zone(should be 35-45%) , 39% 38 Percent area provided,deep pool(forebay)(should be 10-15%) 12% • 39 Percent area provided,deep pool(non-forebay)(should be 5-15%) 15% Depths and Outlet .. 40 Peak attenuation depth above temporary inundation zone(inches) • Temporary inundation zone depth(temporary pool to permanent . 41 15 in pool)(inches) Shallow water zone depth(permanent pool to bottom of wetland) . 42 9 in (Inches) Depth,forebay at entrance(permanent pool to bottom of forebay 43 33 in entrance)(inches) Depth,forebay at exit(permanent pool to bottom of forebay exit) 9 in 44 (inches) Depth,non-forebay deep pools(permanent pool to deep pool 45 39 in bottom)(inches) 46 If there Is an orifice,diameter(inches) 2 in 47 If there is a weir,weir height(Inches) NJA 48 If there is a weir,weir length(inches) • NJA, Drawdown time for the temporary pool(days) 3 STORMWATER WETLAND Soil and Plants 50 Soil amendment depth(Inches) N/A 51 Has a soil amendment specification been provided? _ No 52 Has a landscaping plan that meets SW Wetland MDC(12)been Yes provided? 53 Number of plants per 200 square feet(#)in the shallow water zone: 54 Does the temporary inundation zone planting comply with SW Yes Wetland MDC(14)? Are the dam structure and temporary fill slopes planted In non- 55 clumping turfgrass? Yes 66 Will cattails be planted In the wetland? No ADDITIQNAL INFORMATION' ., ,,. '`'°' ' .. , 57 Please use this space to provide any additional Information about the storrnwater wetland(s): #53(did not allow input):50 plantings per 200sf