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Home My WebLink AboutSW6240902_Supplement-EZ Form_20241023 SUPPLEMENT—EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name _ Sanctuary Subdivision 2 Project Area(ac) 35.21 3 Coastal Wetland Area(ac) _ _ 0 4 Surface Water Area(ac) _ 0 _ 5 Is thl project High or Low Density? _ High 6 i Does this project use an off-site SCM? No COMPLIANCE WITH 02H.1003(4) 7 Width of vegetated setbacks provided(feet) _ 30 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: . 11 Infiltration System 12 Bioretention Cell 13 Wet Pond 2 14 IStormwater Wetland 15 I Permeable Pavement I 16 'Sand Filter _ 17 Rainwater Harvesting(RWH) 18 Green Roof 19 Level Spreader-Filter Strip(LS-FS) f 20 Disconnected Impervious Surface(DIS) 21 Treatment Swale 22 Dry Pond 23 I StormFilter 24 Silva Cell 25 Bayfllter 26 Filterra FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Donald L.Cu .,Jr..PE/Prect Manager 28 Organization: Curry Engineering` 29 Street address: 205 S.Fuquay Ave. 30 City,State,Zip: _ Fuquay-Varina,NC 27526 31 jPhone number(s): 919-552-0849 32 Email: don••curryeng.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. Desi ner r~Rf ? • ' • • � L': Signature of Designer • ‘'%-Ze:tv1;...;,VC;" 1131(2-021 Seal Date 1 I DRAINAGE AREAS ` 1 I Is this a high density project? Yes 2 I If so,number of drainage areas/SCMs 2 3 I 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 PRAINAGE AREA INFORMATION Entire Site 1 2 4 Type of SCM Wet Pond Wet Pond Wet Pond 5 Total drainage area(sq ft) 1191566 733553 458013 6 Onsite drainage area(sq ft) 1191566 733553 458013 _ 7 Offsite drainage area(sq ft) 0 0 0 8 Total BUA in project(sq ft) 367097 sf 197874 sf _ 169223 sf New BUA on subdivided lots(subject to permitting) 9 (sq ft) 246000 sf 126000 sf 120000 sf New BUA not on subdivided lots(subject to 10 permitting)(sf) sf sf sf 11 Offsite BUA(sq ft) sf sf sf 12 Breakdown of new BUA not on subdivided lots: i -Parking(sq ft) sf sf sf -Sidewalk(sq ft) 28750 sf 17424 sf 11326 sf -Roof(sq ft) sf sf sf -Roadwayisq ft) 92347 sf 54450 sf 37897 sf -Future(sq ft) sf sf sf -Other,please specify in the comment box below(sq ft) sf sf sf New infiltrating permeable pavement on 13 subdivided lots(sq ft) sf sf sf New infiltrating permeable pavement not on 14 subdivided lots(sq ft) sf sf sf 7Existing BUA that will remain(not subject to 15 permitting)(sq ft) sf sf sf 16 Existing BUA that is already permitted(sq ft) sf sf sf 17 Existing BUA that will be removed(sq ft) sf sf sf 18 Percent BUA 24% 27% 37% 19 Design storm(inches) 1.0 in 1.0 in 1.0 in 20 Design volume of SCM(cu ft) 32497 cf 17897 cf 14600 cf 21 !Calculation method for design volume Simple Simple Simple ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): DRAINAGE AREAS 1 Is this a high density project? _ Yes 2 If so,number of drainage areas/SCMs 2 3 I 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 4 'Type of SCM Wet Pond _ 5 ,Total drainage area(sq ft) 1191566 6 Onsite drainage area(sq ft) 1191566 _ 7 Offsite drainage area(sq ft) 0 8 Total BUA in project(sq ft) 367097 sf New BUA on subdivided lots(subject to permitting) 9 (sq ft) 246000 sf New BUA not on subdivided lots(subject to 10 ipermitting)(sf) sf 11 Offsite BUA(sq ft) sf 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) sf -Sidewalk(sq ft) 28750 sf -Roof(sq ft) sf -Roadway(sq ft) 92347 sf -Future(sq ft) sf _ -Other,please specify in the comment box below(sq ft) sf New infiltrating permeable pavement on 13 subdivided lots(so ft) sf New infiltrating permeable pavement not on 14 subdivided lots(sq ft) sf Existing BUA that will remain(not subject to 15 permitting)(sq ft) sf 16 l Existing BUA that is already permitted(q ft) sf 17 I Existing BUA that will be removed(sq ft) sf 18 Percent BUA 24% 19 Design storm(inches) 1.0 in 20 Design volume of SCM(cu ft) 32497 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): WET POND 1 Drainage area number 1 I 2 j 2'Minimum required treatment volume(cu ft) 17897 cf ; 14600 cf GENERAL MDC FROM 02H.1050 i 3 Is the SCM sized to treat the SW from all surfaces at build-out? _ Yes Yes 4 Is the SCM located away from contaminated soils? Yes Yes 5 What are the side slopes of the SCM(H:V)? 8 3:1 3:1 Does SCM have retaining walls,gabion walls or other engineered side slopes? No No Are the inlets,outlets,and receiving stream protected from erosion 7'(10-year storm)? Yea Yes Is there an overflow or bypass for inflow volume in excess of the 8 design volume? 1 Yes Yes 9!What is the method fordewatefing the SCM for maintenance? Pump(prefer).. Pump(preferred) 10 If applicable,will the SCM be cleaned out after construction? Yes Yes 11 Does the maintenance access comply with General MDC(8)? Yes Yes 121 Does the drainage easement comply with General MDC(9)? Yes _ Yes 131If the SCM is on a single family lot,does(will?)the plat comply with No No General MDC(10)? 14!Is there an O&M Agreement that complies with General MDC(11)? Yes Yes 151 Is there an O&M Plan that complies with General MDC(12)? Yes Yes 181 Does the SCM follow the device specific MDC? _ Yes Yes 17'.Was the SCM designed by an NC licensed professional? Yes Yes WET-POND MDC FROM 0211.2055 18 Sizing method used SA/DA SA/DA 19.Has a stage/storage table been provided in the calculations? Yes Yes 20 Elevation of the excavated main pool depth(bottom of sediment 344.50 366.00 removal)(fmsl) 21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 345.50 367.00 22_Elevation of the bottom of the vegetated shelf(fmsl) 350.00 371.00 23;Elevation of the permanent pool(fmsi) 350.50 371.50 24 Elevation of the top of the vegetated shelf(frost) 351.00 372.00 25 Elevation of the temporary pool(fmsl) 352.00 373.00 26 Surface area of the main permanent pool(square feet) 8546 8988 27 Volume of the main permanent pool(cubic feet) 28834 cf 31690 cf 28 Average depth of the main pool(feet) 4,55 ft 4,00 ft 29 Average depth equation used Equation 3 Equation 3 30 If using equation 3,main pool perimeter(feet) 424.0 ft 304-0 ft 31; If using equation 3,width of submerged veg.shelf(feet) 3.0 ft 3.0 ft 321 Volume of the forebay(cubic feet) 1 5470 cf 7748 cf 33 Is this 15-20%of the volume in the main pool? Yes Yes 34 Clean-out depth for forebay(inches) 12 in 12 in 35 Design volume of SCM(cu ft) 19905 cf 24011 cf 36 Is the outlet an orifice or a weir? Orifice Orifice 371 If orifice,orifice diameter(inches) 2 in 2 in 38! If weir,weir height(inches) in In 391 If weir,weir length(inches) i in in 40i Drawdown time for the temporary pool(days) 3.1 3.74 IAre the inlet(s)and outlet located in a manner that avoids short- circuiting? Yes Yes 42 Are berms or baffles provided to improve the flow path? No No 43 Depth of forebay at entrance(inches) 60 in 42 in 44 Depth of forebay at exit(inches) 54 in 36 in 45 Does water flow out of the forebay in a non-erosive manner? Yes Yes 46 Width of the vegetated shelf(feet) 6 ft 6 ft ! 471 Slope of vegetated shelf(H:V) 6:1 6:1 Does the orifice drawdown from below the top surface of the 48 permanent pool? Yes Yes Does the pond minimize impacts to the receiving channel from the 1- 49 yr,24-hr storm? Yes Yes Are fountains proposed?(If Y,please provide documentation that 50 MDC(9)is met.) No No 51 Is a trash rack or other device provided to protect the outlet system? Yes Yes 52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes 53 Species of turf that will be used on the dam and embankment Fescue or Fescue or Certt)pede Centipede 54!Has a planting plan been provided for the vegetated shelf? Yes Yes ADDITIONAL INFORMATION 55;Please use this space to provide any additional information about the 551, wet pond(s): Wet Pond 1 4:48 PM 7/30/2024