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Home My WebLink AboutSWA000206_Supplement-EZ Form_20230524SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION _ 1 Project Name Villages At Waxhaw 2 Project Area ac 7.44 3 _ Coastal Wetland Area ac _ 0 4 Surface Water Area ac 0 5 Is this project High or Low Density? High 6 1 Does this project use an off -site SCM? No COMPLIANCE WITH 021-1.1003(4) . 7 Width of vegetated setbacks provided feet N/A 8 Will the vegetated setback remain vegetated? N/A 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 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 1 Filterra FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Weston Boles, Senior Consultant 28 Organization: W.K. Dickson 29 Street address: 1213 W. Morehead St. Suite 300 30 City, State, Zip: Charlotte, NC 28208 31 Phone numbers : 704-305-2331 32 Email: wboles@wkdickson.com Certification Statement: 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. CARO _=�:•� SFAS � : = 0- 037833 _ :.0 0N' G\\Q, \\\� Signature of Designer z3 Date Seal 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 5 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 Wet Ponds 4 Type of SCM 5 Total drainage area (sq ft 208226.00 208226.00 6 Onsite drainage area (sq ft 204830.00 204830 7 Offsite drainage area (sq ft 3396.00 3396 8 Total BUA in project (sq ft 110451.00 110451 sf 9 New BUA on subdivided lots (subject to ermitting) (sq ft sf sf 10permitting) New BUA not on subdivided lots (subject to sf 110451 sf 110451 sf 11 offsite BUA sq ft sf sf 12 Breakdown of new BUA not on subdivided lots: - Parking (sq ft sf sf - Sidewalk sq ft 15335 sf 15335 sf - Roof (sq ft 52762 sf 52762 sf - Roadway s ft 42310 sf 42310 sf - Future (sq ft sf sf - Other, please specify in the comment box below (sq ft 44 sf 44 sf 13 New infiltrating permeable pavement on subdivided lots (sq ft sf sf 14 New infiltrating permeable pavement not on subdivided lots (sq ft sf sf 15permitting) Existing BUA that will remain (not subject to s ft sf sf 16 Existing BUA that is already permitted (sq ft sf sf 17 Existing BUA that will be removed (sq ft sf 18 Percent BUA 53% 53% 19 Design storm inches 1.0 in 1.0 in 20 Design volume of SCM cu ft 11930 sf 11930 cf 21 Calculation method for design volume Simple Method Simple Method ADDITIONAL INFORMATION 22 Please use this space to provide any additional information about the drainage area(s): WET POND 1 Drainage area number 1 1 __—IY 2 Minimu_m required treatment volume cu ft GENERAL MDC FROM 02H .1050 3 Is the SCM sized to treat the SW from all surfaces at build -out? cf Yes 4 Is the SCM located away from contaminated soils? Yes 5 What are the side slopes of the SCM H:V ? 2:1 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? Yes 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 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 devicespecific MDC? Yes 17 Was the SCM designed by an NC licensedprofessional? 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 removal) (fmsl 613.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl 614.00 22 Elevation of the bottom of the vegetated shelf fmsl 618.50 23 Elevation of the permanent pool fmsl 619.00 24 Elevation of the top of the vegetated shelf fmsl 619.50 25 Elevation of the temporary pool fmsl 620.26 26 Surface area of the main permanent pool square feet 6742 27 Volume of the main permanent pool cubic feet 23125 cf 28 Average depth of the main pool feet 3.13 ft 29 Average depth euation used Equation 2 301 If using equation 3, main pool perimeter feet N/A 31 If using equation 3, width of submerged veg. shelf feet N/A 32 Volume of the forebay cubic feet 2237 cf 33 Is this 15-20% of the volume in the main pool? Yes 34 Clean -out depth for forebainches 61n 35 Design volume of SCM cu ft 11930 cf 36 Is the outlet an orifice or a weir? Orifice 37 If orifice, orifice diameter inches 1 in 381 If weir, weir height inches na If weir, weir length inches na Drawdown time for the tem ora ool da s 5 Are the inlet(s) and outlet located in a manner that avoids short- arcuitin ? Yes r Are berms or baffles rovided to im rove the flow ath? Yes Depth of forebay at entrance (inches 66 in De th of forebay at exit inches 60 in Does water flow out of the foreba in a non -erosive manner? Yes Width of the vegetated shelf feet 6 ft Slope of vegetated shelf H:V 6:1 Does the orifice drawdown from below the top surface of the ermanent 001? Yes r5048 Does the pond minimize impacts to the receiving channel from the 1- r, 24-hr storm? Yes 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 Native Grasses 54 Has a planting plan been provided for the vegetated shelf? ADDITIONAL INFORMATION No 55 Please use this space to provide any additional information about the wet pond(s):