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Home My WebLink AboutSW6201003_Supplement-EZ Form_20210323 SUPPLEMENT-EZ COVER PAGE FORMSLOADED PROJECT INFORMATION Project Name Village at Rockfish 1 2Project Area (ac)21 3Coastal Wetland Area (ac)0 4Surface Water Area (ac)0 5Is this project High or Low Density?High Does this project use an off-site SCM?No 6 COMPLIANCE WITH 02H .1003(4) 7Width of vegetated setbacks provided (feet)No surface water on project area 8Will the vegetated setback remain vegetated?N/A 9If BUA is proposed in the setback, does it meet NCAC 02H.1003(4)(c-d)? Is streambank stabilization proposed on this project? 10 NUMBER AND TYPE OF SCMs: 11Infiltration System 12Bioretention Cell 13Wet Pond1 14Stormwater Wetland 15Permeable Pavement 16Sand Filter 17Rainwater Harvesting (RWH) 18Green Roof 19Level Spreader-Filter Strip (LS-FS) 20Disconnected Impervious Surface (DIS) 21Treatment Swale 22Dry Pond 23StormFilter 24Silva Cell 25Bayfilter Filterra 26 FORMSLOADED DESIGNER CERTIFICATION 27Name and Title:C. Scott Brown, PE Owner 28Organization:4D Site Solutions Inc. 29Street address:409 Chicago Dr. Ste. 112 30City, State, Zip:Fayetteville, NC 28306 31Phone number(s):910-426-6777 Email:sbrown@4dsitesolutions.com 32 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 ______________________________________________ Signature of Designer ______________________________________________ Date Seal DRAINAGE AREAS 1Is this a high density project?Yes ge areas/SCMs1 2 If so, number of draina 3Does this project have low density areas?No 4 If so, number of low density drainage areas0 Is all/part of this project subject to previous rule 5versions?No FORMSLOADED Entire Site1 DRAINAGE AREA INFORMATION 4Type of SCM wet pondwet pond ge area (sq ft)914760704557 5Total draina 6Onsite drainage area (sq ft)914760704557 7Offsite drainage area (sq ft)00 ject(sq ft)319973 sf288473 sf 8Total BUA in pro New BUA on subdivided lots (subject to 9permitting)(sq ft)243600 sf212100 sf New BUA not on subdivided lots (subject to 10permitting)(sf)76373 sf76373 sf 11Offsite BUA (sq ft) 12Breakdown of new BUA not on subdivided lots: - Parking(sq ft) sf - Sidewalk (sq ft)40 sf40 sf - Roof (sq ft) sf - Roadway(sq ft)76333 sf76333 sf - Future (sq ft) sf - Other, please specify in the comment box below(sq ft) sf sf New infiltrating permeable pavement on 13subdivided lots (sq ft) sf sf New infiltrating permeable pavement not on 14subdivided lots (sq ft) sf sf Existing BUA that will remain (not subject to 15permitting)(sq ft) sf sf 16Existing BUA that is already permitted (sq ft) sf sf 17Existing BUA that will be removed (sq ft) sf sf 18Percent BUA35%41% 19Design storm (inches)1.0 in1.0 in 20Design volume of SCM (cu ft)35676 cf35676 cf Calculation method for design volumeSimpleSimple 21 ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22drainage area(s): WET POND area number 21 Minimum required treatment volume cu ft 26591 cf GENERAL MDC FROM 02H .3050 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 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No 7 Are the inlets, outlets, and receiving stream protected from erosion 10- ear storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the desi n volume? Yes 9 What is the method for dewatering the SCM for maintenance? Pump preferred 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 bX an NC licensedprofessional? Yes WET POND MDC FROM 02H .1053 181 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 removal) (fmsl 73.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 74.00 22 Elevation of the bottom of the vegetated shelf (fmsl) 78.00 23 Elevation of the permanent pool (fmsl) 78.50 24 Elevation of the top of the vegetated shelf (fmsl) 79.00 25 Elevation of the temporary pool (fmsl) 79.38 26 Surface area of the main permanent pool (square feet) 23872 27 Volume of the main permanent pool (cubic feet) 84269 cf 28 Average depth of the main pool (feet) 3.71 ft 29 Average depth equation used Equation 2 301 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) 14765 cf 33 Is this 15-20% of the volume in the main pool? Yes 34 Clean -out depth for forebay (inches) 54 in 35 Design volume of SCM (cu ft) 36 Is the outlet an orifice or a weir? Orifice 371 If orifice, orifice diameter (inches) 3 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- circuiting? Yes 42 Are berms or baffles provided to improve the flow path? No 431 Depth of forebay at entrance (inches) 67 in 44 Depth of forebay at exit (inches) 60 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 permanentpool? Yes 49 Does the pond minimize impacts to the receiving channel from the 1- r, 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 53 Species of turf that will be used on the dam and embankment Centepede 54 Hasa plantin Ian been provided for the vegetated shelf? Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Line 37: Should read 2.8", spreadsheet is rounding Wet Pond 1 10:04 AM 3/23/2021