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Home My WebLink AboutSW6210905_Supplement-EZ Form_20230405SUPPLEMENT-EZ COVER PAGE FORMS LOADED t PROJECTINFORMATION 77777777 1 I Project Name f Surface Water Area (ac) Is this project High or Low Density? Does this proiect use an off -site SCM? Champion Court Rental_ 6.72 0 High No COMPLIANCE WITH 02H .1003(4) 7 (Width of vegetated setbacks provided feet N/A 8 1 Will the vegetated setback remain ve etated? N/A _ 9 If BUA is proposed in the setback does it meet NCAC 02H.1003(4)(c-d)? N/A 10 I Is streambank stabilization proposed on this proiect? NUMBER AND TYPE OF SCMS: 11 Infiltration System 12 IBioretention Cell t---- 13 Met Pond 14 Stormwater Wetland 15 i Permeable Pavement Level Pond 26 Filterra FORMS LOADED DESIGNER CERTIFICATION 27 ' Name and Title: Samuel R. Nye,_PE Principal Engineer 28 Organization: _ The Site Group, PLLC 29 Street address: 1111 Oberlin Rd. 30 City,State Zip: _ , -__ _ Raleigh, NC 27607 31 Phone numberfsl- 919-835-4787 Email: 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. uesryner ��\1111111///t C A /QO/ //��. 4 EAL 3498 Seal � I W O * 'Zse�__A/ Sicyature of Designer Date L/ /Sf2v2.3 DRAINAGE AREAS 1 Is this a high densityproject? a Yes _^ 2 If so, number of drainage areas/SCMs Does this project have low density areas? i 1 No 3 4 If so, number of low density drainage areas 0 5 Is all/part of this project subject to previous rule i versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 4 I ype OT OUVI vvetpurlu JTotal drainage area (sq ft) 316899 193759 ;Onsite drainage area (sq ft) 205413 183789 Offsite drainage area (sq ft) 111486 9970 Total BUA in project (sq ft) 166330 sf 151472 sf 5 6 7 8 9 New BUA on subdivided lots (subject to permitting) (sq ft 10 .11 12 New BUA not on subdivided lots (subject to permitting) (s 149948 sf 145819 sf Offsite BUA (sq ft) Breakdown of new BUA not on subdivided lots: 5653 sf 89468 sf 85339 sf I - Parkin (sq ft - Sidewalk (sq ft) .v.a. _ _._�____._-� - Roof (sq ft) 20160 sf 20160 sf - Roadway (sq ft - Future (sq ft) 40320 sf 40320 sf - Other, please specify in the comment box below sq ft) 13 New infiltrating permeable pavement on subdivided lots (sq ft) _ 14 New infiltrating permeable pavement not on subdivided lots (sq ft) 15permitting) Existing BUA that will remain (not subject to sq ft 16382 sf 16 Existing BUA that is already permitted sq ft 17 Existing BUA that will be removed (sq ft) 18 Percent BUA 52% 78% 19 Design storm (inches) 1.0 in 1.0 in 20 IDesign volume of SCM (cu ft) 21 Calculation method for design volume JSCS 12147 cf Method ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 1drainage area(s): Area for the entire site includes offsite drainage bypassing the wetpond and Drainage Area C. To offset the new BUA that cannot be treated by the pond, 5,653 SF of the existing Buffalo Lake Road is treated. WET POND 1 Drainage area number 1 c 21Minimum regwred treatment volume (cu ft) 12147 cf aGENERAL MDC PROM 02H .1050 3 Is the SCM sized to treat the SW from all surfacesatbuild-out? Yes 4 Is the SCM located away from contaminated soils? Yes_ 5 What are the side slopes of the SCM (H:V)? 3:1 6 Does the SCM have retaining walls, gabion walls or other engineered side slo es? 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 referred 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 General MDC 10 ? N/A 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 161 Does the SCM follow the device specific MDC? Yes 17 Was the SCM designed by an NC licensed professional? Yes POND MDC PRO .1053 1 18&Sizing method used SA/DA 19 Has aotage/storage table been provided in the calculations? Yes 20 Elevation of the excavated main pool depth (bottom of sediment removal) (fmsl 259.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 260.00 22 Elevation of the bottom of the vegetated shelf fmsl) 264.00 23 Elevation of the permanent pool fmsl 264.50 24 Elevation of the top of the vegetated shelf fmsl 265.00 25 Elevation of the temporary of fmsl) 266.00 26 Surface area of the main permanent pool(square feet 5653 27 Volume of the main permanent pool cubic feet 15887 cf 28 Average depth of the main pool feet 3.00 it 29 Average depth euation used Equation 3 30 If using equation 3, main pool perimeter (feet) 346.8 ft 31 If using equation 3, width of submerged veg, shelf feet 3.0 it 32 Volume of the forebay (cubic feet) 2778 cf 33 Is this 15-20% of the volume in the mainpool? Yes 34 Clean -out depth for forebay inches 54 in 35 Design volume of SCM (cu ft) 12147 cf 36 Is the outlet an orifice or a weir? Orifice 37 If orifice, orifice diameter (inches) 2 in — 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 2.8 41 Are the inlet(s) and outlet located in a manner that avoids short- clrcuitin ? Yes 42 Are berms or baffles provided to improve the flow ? Yes 43 Depth of forebay at entrance inches 66 in 44 Depth of forebay at exit (inches) 54 in 45 Does water flow out of the forebay in a non -erosive manner? Yes 46 Width of the vegetated shelf (feet) 6 it 47 Slope of vegetated shelf H: 6:1 48 Does the orifice drawdown from below the top surface of the permanent pool? Yes 49 Does the pond minimize impacts to the receiving channel from the 1- yr, 24-hr storm? Yes 50 Are fountains proposed? (if Y, please provide documentation that MDC(9) is met.) No 51 Is a trash rack or other device provided to protect the outlet system? Yes 52 Are the dam and embankment planted in non -clumping turf grass? Yes —531 Species of turf that will be used on the dam and embankment 54 1 Has a lantin Ian been provided for the vegetated shelf? ADDITIONAL INFORMATION 55' Please use this space to provide any additional information about the wet pond(s): Actual Orifice Diameter. 1.5 inches Centipede grass Yes + Wet Pond 1 10:11 AM 4/5/2023