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Home My WebLink AboutSW4210501_Supplement-EZ Form_20210525SUPPLEMENT-EZ COVER PAGE FORMS LOADEL) PROJECT INFORMATION _ 1 Project Name 2 Project Area ac 3 Coastal Wetland Area ac 4 Surface Water Area ac 5 Is this project High or Low Density? 6 Does this project use an off -site SCM? Dollar General Store 2.03 No COMPLIANCE WITH 02H .1003(4) 7 Width of vegetated setbacks provided (feet)- 8 Will the vegetated setback remain vegetated? NIA 9 If BUA is proposed in the setback, does it meet NCAC 02H.1003 4 c-d ? No 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 1 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: 28 Organization: 29 Street address: 30 City, State, Zi : 31 Phone number(s): 32 Email: Matt Lowder, PE Triangle Site Design, PLLC 4004 Barrett Dr, Suite 101 Raleigh, NC 27609 919-553-6570 mlowder@trianglesitedesign.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 SEAL24434 � M Y 5 Iy Seal f Signature of Designer �-Z-7 2 Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so. number of drainage areas/SCMs 1 3 Does this ro'ect have low density areas? No 4 If so, number of low density drainage areas 0 5 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 4 Type of SCM Wet Pond Wet Pond 5 Total drainage area (sq ft 88448 48714 6 Onsite drainage area (sq ft 88448 48714 7 Offsite drainage area (sq ft 0 0 8 Total BUA in project (sq ft 38841 sf 38022 sf 9 New BUA on subdivided lots (subject to permitting) (sq ft - - 10permitting) New BUA not on subdivided lots (subject to (sf) 11 Offsite BUA (sq ft - - 12 Breakdown of new BUA not on subdivided lots: Parking (sq ft 26385 sf 25566 sf Sidewalk (sq ft 1816 sf 1816 sf Roof (sq ft 10640 sf 10640 sf _ Roadway s ft Future (sq ft 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 - 15 Existing BUA that will remain (not subject to ermitting) (sq ft - 16 Existing BUA that is already permitted (sq ft 17 Existing BUA that will be removed (sq ft - - 18 Percent BUA 44% 78% 19 Design storm inches 1.0 in 20 Design volume of SCM cu ft 3055 cf 21 Calculation method for design volume Simple Method ADDfTIONAL INFORMATION 22 Please use this space to provide any additional information about the draina a area(s): Some area at the driveway entrance is not captured. WET POND 1 IDrain_a92 area number 1 _ 2 Minimum required treatment volume cu ft 3055 cf GENE L MDC FROM 02H AWO 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: ? 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 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 00)? Is there an O&M Agreement that complies with General MDC (11)? N/A 14 Yes 15 Is there an O&M Plan that complies with General MDC 12 ? 1 Yes 16 Does the SCM follow the devicespecific MDC? Yes 17 Was the SCM designed by an NC licensed rofessional? Yes 3 18 Sizing method used SA/DA Yes 650.00 19 Has a stage/storage table been provided in the calculations? 20 Elevation of the excavated main pool depth (bottom of sediment removal) (fmsl 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 651.00 22 Elevation of the bottom of the ve etated shelf (fmsl) 656.50 23 Elevation of the permanent pool fmsl) 657.00 24 Elevation of the top of the vegetated shelf fmsl 657.50 25 Elevation of the temporary pool (fmsl) 658.20 26 Surface area of the main permanent pool (square feet) 2012 27 Volume of the main permanent pool cubic feet 4644 cf 28 lAverage depth of the main pool (feet) 3.06 ft 29 Average depth euation used Equation 3 30 If using equation 3, main pool perimeter feet 189.0 ft 31 If using equation 3, width of submerged veg. shelf feet 3.0 ft 32 Volume of the foreba (cubic feet) 821 cf 33 Is this 15-20% of the volume in the mainpool? Yes 34 Clean -out depth for foreba inches 36 in 351 Design volume of SCM cu ft 3055 cf 36 Is the outlet an orifice or a weir? Orifice 37 If orifice, orifice diameter (inches) 1 in 38 If weir, weir height inches 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 2.13 41 Are the inlet(s) and outlet located in a manner that avoids short- circuitin ? Yes 42 Are berms or baffles provided to improve the flowpath? Yes 43 Depth of forebay at entrance inches 48 in 44 Depth of forebay at exit (inches) 42 in 45 Does water flow out of the forebay in a non -erosive manner? Yes 46 lWidth of the vegetated shelf feet 6 ft 47 Slope of vegetated shelf H: 6:1 48 Does the orifice drawdown from below the top surface of the permanentpool? Yes Yes No 49 Does the pond minimize impacts to the receiving channel from the 1- r 24-hr storm? 50 Are fountains proposed? (If Y, please provide documentation that 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 Hybrid Bermuda 54 Hasa Elanting 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): Wet Pond 1 11:01 AM 4/27/2021