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HomeMy WebLinkAboutSW4240501_Supplement-EZ Form_20240819 SUPPLEMENT-EZ COVER PAGE rC! PROJECT INFORMATION 1 Project Name Reserve at Old Hollow 2 Project Area(ac) 15.16 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? • 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 0 12 Bioretention Cell 0 13 Wet Pond 2 14 Stormwater Wetland 0 15 Permeable Pavement 0 16 Sand Filter 0 17 Rainwater Harvesting(RWH) 0 18 Green Roof 0 19 Level Spreader-Filter Strip(LS-FS) 0 20 Disconnected Impervious Surface(DIS) 0 21 Treatment Swale 0 22 Dry Pond 0 23 StormFilter 0 24 Silva Cell 0 25 Bayfilter 0 26 Filterra 0 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Norris Z.Clayton,PE,President 28 Organization: Hugh Creed Associates,Inc.,P.A. _ 29 Street address: 1306 W.Wendover Ave. 30 City,State,Zip: Greensboro,NC 27408 31 Phone number(s): 336-906-3976 _ 32 Email: hca@hughcreedassociates.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 it ita#0._ 7,4 'Y SoaSo°�.. ( SEA : Si nature of Desig NryeF/ nT dp � F//6/2—`f Seat. .: .. • , Date DRAINAGE AREAS 1 Is this a high density project? I Yes 2 If so,number of drainage areas/SCMs 2 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 I I FORMS LOADED , DRAINAGE AREA INFORMATION Entire Site 1 2 4 of SCM Wet Pond Wet Pond 5 Total drainage area(sq ft) 661911 180307 276834 6 Onsite drainage area(sq ft) 661911 180307 _276834 7 Offsite drainage area(sq ft) 0 0 0 8 Total BUA in project(sq ft) 249086 sf 93320 sf 162078 sf New BUA on subdivided lots(subject to . 9 permitting)jsq ft) 123783 sf 46559 sf 77224 sf 'New BUA not on subdivided lots(subject to r10 permitting)(sf) 125303 sf 40449 sf 84854 sf 11 Offsite BUA(sq ft) sf sf sf 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) 44504 sf 15027 sf 29477 sf -Sidewalk(sq ft) 11272 sf 3004 sf 82.68 sf -Roof(sq ft) sf sf sf ._-Roadway(sq ft) 68082 sf --"-- 22418 sf 45664 sf -Future(sq ft) sf _ sf sf • -Other,please specify In the comment box below(sq ft) 1445 sf sf 1445 sf New infiltrating permeable pavement on 13 subdivided lots(sq_ftL sf sf sf New infiltrating permeable pavement not on 14 subdivided lotsLsq ft) sf ___, sf sf Existing BUA that will remain(not subject to 15 permitting)(sq ft) 15529 sf 6312 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 38% 50% 59% 19 'Design storm(inches) 1.0 in 1.0 in 20 Design volume of SCM(cu ft) 7328 cf _ 13307 cf 21 Calculation method for desi n volume Simple Simple ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): "Other"built-upon area from DA 2 is for gravel dnveway and pad for -Sanitary Sewer Lift Station and CBU's. WET POND 1 Drainage area number 1 2 2 Minimum required treatment volume(cu ft 7740 cf 1 13307 cf MD_ C FROM 02H. 0 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)? 3:1 3:1 6 Does the SCM have retaining walls,gabion walls or other No No engineered side slopes? 7 Are the inlets,outlets,and receiving stream protected from erosion (10-year storm)? Yes Yes 8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes design volume? 9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice Drawdown Orifice __ 10tIf applicable,will the SCM be cleaned out after construction? Yes Yes 11 Does the maintenance access comply with General MDC(8)? Yes Yes 12 Does the drainage easement comply with General MDC(9)? Yes Yes 13 If the SCM is on a single family lot,does(will?)the plat comply with N/A N/A General MDC(10)? 14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes _ 15 Is there an O&M Plan that complies with General MDC(12)? Yes Yes 16 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 02H.1053 18lSizing method used SA/DA SA/DA 191 Has a stage/storage table been provided in the calculations? Yes Yes 20 Elevation of the excavated main pool depth(bottom of sediment removal)Urns') i 955.00 935.00 21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 1 956.00 936.00 22 Elevation of the bottom of the vegetated shelf(fmsl) 961.00 941.00 _ 23 Elevation of thepermanent pool(fmsl) 962.00 942.00 _ 24 Elevation of the top of the vegetated shelf(fmsl) 962.00 942.00 25 Elevation of the temporary pool(fmsl) 963.10 943.70 26 Surface area of the main permanent pool(square feet) 5386 5878 27 Volume of the main permanent pool(cubic feet) 17757 cf 18148 cf 28 Average depth of the main pool(feet) 3.30 ft 3.09 ft 29 Average depth equation used Equation 2 Equation 2 30 If using equation 3,main pool perimeter(feet) 31 If using equation 3,width of submerged veg.shelf(feet) 32 Volume of the forebay(cubic feet) 2725 cf _ 3119 cf 33 Is this 15-20%of the volume in the main pool? Yes Yes 34 Clean-out depth for forebay(inches) 36 in 36 in Design volume of SCM(cu ft) _1 7972 cf _ 15244 cf __ 36 Is the outlet an orifice or a weir? Orifice i Orifice 37 If orifice,orifice diameter(inches) 1.25 in 1.50 in _38 If weir,weir held ht(inches) 39 If weir,weir length(inches, _ 40 Drawdown time for the temporary pool(days) 3.6 3.6 41 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes circuiting? 42 Are berms or baffles provided to improve the flow path? No No 43 Depth of forebay at entrance(inches) _ 36 in 36 in 44 Depth of forebay at exit(inches) 30 in 30 in 45 Does water flow out of the forebay in a non-erosive manner? Yes Yes 46l W idth of the vegetated shelf(feet) 6 ft 6 ft 4 S7 lope of vegetated shelf(H:V) 6:1 6:1 48 Does the orifice drawdown from below the top surface of the I,ermanent pool? No 49 Does the pond minimize Impacts to the receiving channel from the 1- yr.24-hr storm? Yes Yes Are fountains proposed?(If Y,please provide documentation that No No 50 MDC(9)is met.) 51,Is a trash rack or other device provided to protect the outlet system? Yes Yes 52Are 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 Hybrid Bermuda Hybrid Bermuda 54 Has a t;lanting plan been provided for the vegetated shelf? Yes Yes ADDITIONAL INFORMATION ®� J Please use this space to provide any additional information about 55 the wet pond(s): )Nit Dnnri 3 3:01 PM 8/16/2024