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HomeMy WebLinkAboutSW5240103_Supplement-EZ Form_20240522 SUPPLEMENT-EZ COVER PAGE LOAD SUPPLEMENT FORMS PROJECT INFORMATION 1 Project Name -_ Rocky Mount Memorial Park 2 Project Area(ac) - 10.77 3 Coastal Wetland Area(ac) 4 Surface Water Area(ac) .13(wet pond permanent pool) 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? I No NUMBER AND TYPE OF SCMs: 11 Infiltration System 12 Bioretention Cell 13 Wet Pond _ 1 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 LOAD SUPPLEMENT FORMS DESIGNER CERTIFICATION 27 Name and Title: Phillip R Joyner,Jr.-Project Engineer 28 Organization: { Mack Gay Associates,PA __ 29 Street address: 1667 Thomas A Betts Pkwy 30 City,State,Zip: __ _� Rocky Mount,NC 27804 _31 Phone number(s): 252-446-3017 32 Email: phillip©mackgaypa.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 `\Lttlllll 1111j1 `\ (N CAR .� Q� S l-/tL Signature of Designer l I Ed -036848 . _ • . =,l�A ,,, ,,,s' tc, %, R. Jo't? s-/0-Z0?el '1j1111r11it111\\ 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 FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 4 Type of SCM Wet Pond 5 Total drainage area(sq ft) 474804 301,871 6 Onsite drainage area(sq ft) 474804 301,871 7 Offsite drainage area(sq ft) 8 Total BUA in project(sq ft) 70132 sf 70132 sf New BUA on subdivided lots(subject to permitting) 9 (sq ft) _ New BUA not on subdivided lots(subject to 10 permitting)(sf) 66913 sf 66913 sf 11 Offsite BUA(sq ft) 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) -Sidewalk(sq ft) 5431 sf 5431 sf -Roof(sq ft) Roadway(sq ft) 45800 sf 45800 sf -Future(sq ft) -Other,please specify in the comment box below(sq ft) 15681 sf 15681 sf New infiltrating permeable pavement on 13 subdivided 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) 3219 sf 3219 sf 16 Existing BUA that is already permitted(sq ft) 17 Existing BUA that will be removed(sq ft) 18 Percent BUA 15% 23% 19 Design storm(inches) 1.0 in 20 Design volume of SCM(cu ft) 6517 cf 21 Calculation method for design volume Simple Method ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): Other BUA is proposed mausoleum WET POND 1 Drainage area number 1 2 Minimum required treatment volume (cu ft) 6517 cf GENERAL MDC FROM 02H.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)? 3:1 Does the SCM have retaining walls, gabion walls or other engineered 6 side slopes? No 7 Are the inlets, outlets, and receiving stream protected from erosion Yes (10-year storm)? 8 Is there an overflow or bypass for inflow volume in excess of the Yes design volume? 9 What is the method for dewatering the SCM for maintenance? Other 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)? 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 WET POND MDC FROM 02H .1053 18 Sizing method used SA/DA 19 Has a stage/storage table been provided in the calculations? Yes 20 Elevation of the excavated main pool depth (bottom of sediment 166.00 removal) (fmsl) 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 167.00 22 Elevation of the bottom of the vegetated shelf (fmsl) 172.00 23 Elevation of the permanent pool (fmsl) 172.00 24 Elevation of the top of the vegetated shelf(fmsl) 173.00 25 Elevation of the temporary pool (fmsl) 173.19 26 Surface area of the main permanent pool (square feet) 3170 27 Volume of the main permanent pool (cubic feet) 10561 cf _ 28 Average depth of the main pool (feet) 3.30 ft 29 Average depth equation used 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) 2098 c f 33 Is this 15-20% of the volume in the main pool? Yes 34 Clean-out depth for forebay (inches) 12 in 35 Design volume of SCM (cu ft) 19840 cf 36 Is the outlet an orifice or a weir? Orifice Wet Pond 1 7:25 PM 5/16/2024 WET POND 37 If orifice, orifice diameter(inches) 1.3 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 3.3 41 Are the inlet(s) and outlet located in a manner that avoids short- Yes circuiting? 42 Are berms or baffles provided to improve the flow path? No 43 Depth of forebay at entrance (inches) 48 in 44 Depth of forebay at exit (inches) 24 in 45 Does water flow out of the forebay in a non-erosive manner? Yes 46 Width of the vegetated shelf(feet) _ 6 ft 47 Slope of vegetated shelf (H:V) _ 6:1 48 Does the orifice drawdown from below the top surface of the Yes permanent pool? 49 Does the pond minimize impacts to the receiving channel from the 1- Yes yr, 24-hr storm? 50 Are fountains proposed? (If Y, please provide documentation that No MDC(9) is met.) 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 53 Species of turf that will be used on the dam and embankment Centipede 54 Has a planting plan been provided for the vegetated shelf? Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Pond will utilize a pump for dewatering. Wet Pond 2 7:25 PM 5/16/2024