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Home My WebLink AboutSW3221006_Supplement-EZ Form_20230824 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name Cottages at Wingate-Phases 18,2 2 Project Area(ac) 118.64 3 Coastal Wetland Area(ac) N/A 4 Surface Water Area(ac) 17.43 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? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 12 Bioretention Cell 13 Wet Pond 4 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 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Matthew C.Kirchner,PE 28 Organization: Eagle Engineering, Inc. 29 Street address: 2013-A Van Buren Ave 30 City,State,Zip: Indian Trail,NC 28079 31 Phone number(s): 704-882-4222 32 Email: mkirchner@eagleonline.net 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 \�tI1II1111/j// \\\\ ,cN CA/?0 /%,/ O0FE s �ti .'9 • . SEAL < = Signature of Designer 04550 = /' yFw C K��G 04/19/2023 , p�4`119/2023 S /l II Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so,number of drainage areas/SCMs 4 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 2 3 4 4 Type of SCM Wet Pond Wet Pond Wet Pond Wet Pond 5 Total drainage area(sq ft) 5370677 1496875 1019236 459674 233461 6 Onsite drainage area(sq ft) 5239620 1391325 1001463 459674 233461 7 Offsite drainage area(sq ft) 131057 113284 17773 0 0 8 Total BUA in project(sq ft) 1253016 sf 578768 sf 376873 sf 174676 sf 65776 sf New BUA on subdivided lots(subject to permitting) 823354 sf 9 (sq ft) 378575 sf 272762 sf 121722 sf 45795 sf New BUA not on subdivided lots(subject to 377239 sf 10 permitting)(sf) 191625 sf 104111 sf 52954 sf 19981 sf 11 Offsite BUA(sq ft) 52423 sf 45314 sf 7109 sf sf sf 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) 19488 sf 19488 sf 0 sf 0 sf 0 sf -Sidewalk(sq ft) 19157 sf 10849 sf 4455 sf 2318 sf 1535 sf -Roof(sq ft) 0 sf 0 sf 0 sf Osf i 0 sf -Roadway(sq ft) 330026 sf 161288 sf 99656 sf 50636 sf 18446sf -Future(sq ft) sf sf sf sf -Other,please specify in the comment box below(sq ft) sf sf sf sf New infiltrating permeable pavement on 13 subdivided lots(sq ft) sf sf sf sf New infiltrating permeable pavement not on 14 subdivided lots(sq ft) sf sf sf sf Existing BUA that will remain(not subject to 15 permitting)(sq ft) 52423 sf 45314 sf 7109 sf sf sf 16 Existing BUA that is already permitted(sq ft) 0 sf sf sf sf sf 17 Existing BUA that will be removed(sq ft) 0 sf sf sf sf sf 18 Percent BUA 23% 39% 37% 38% 28% 19 Design storm(inches) 5.3 in 5.3 in 5.3 in 5.3 in 5.3 in 20 Design volume of SCM(cu ft) 118354 cf 55103 cf 40299 cf 15167 cf 7785 cf 21 Calculation method for design volume Simple Method Simple Method Simple Method Simple Method Simple Method ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): WET POND 1 Drainage area number Al A2 A3 B 2 Minimum required treatment volume cu ft 1 49645 cf I 15016 cf I 5906 cf I 32512 cf GENERAL MDC FROM 02H.1050 3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes Yes Yes 4 Is the SCM located away from contaminated soils? Yes Yes Yes Yes 5 What are the side slopes of the SCM(H:V)? 3:1 3:1 3:1 3:1 6 Does the SCM have retaining walls,gabion walls or other engineered No No No No side slopes? 7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes Yes Yes (10-year storm)? 8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes Yes Yes design volume? 9 What is the method for dewatering the SCM for maintenance? Pump(preferred) Pump(preferred) Pump(preferred) Pump(preferred) 10 If applicable,will the SCM be cleaned out after construction? Yes Yes Yes _ Yes 11 Does the maintenance access comply with General MDC(8)? Yes Yes Yes Yes 12 Does the drainage easement comply with General MDC(9)? Yes Yes Yes Yes 13 If the SCM is on a single family lot,does(will?)the plat comply with N/A N/A N/A N/A General MDC(10)? 14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes Yes Yes 15 Is there an O&M Plan that complies with General MDC(12)? Yes Yes Yes Yes 16 Does the SCM follow the device specific MDC? Yes Yes Yes Yes 17 Was the SCM designed by an NC licensed rofessional? Yes Yes Yes Yes 'WET POND MDC FROM 02H.1053 18 Sizing method used SA/DA _ SA/DA SA/DA SA/DA 19 Has a stage/storage table been provided in the calculations? Yes Yes Yes Yes 20 Elevation of the excavated main pool depth(bottom of sediment 507.00 509.00 525.00 493.00 removal)(fmsl) 21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 508.00 510.00 526.00 494.00 22 Elevation of the bottom of the vegetated shelf(fmsl) 512.00 514.00 532.00 498.00 23 Elevation of the permanent pool(fmsl) 512.00 514.00 532.00 498.00 24 Elevation of the top of the vegetated shelf(fmsl) 513.00 515.00 533.00 499.00 25 Elevation of the temporary pool(fmsl) 513.00 515.00 533.00 499.00 26 Surface area of the main permanent pool(square feet) 36137 10853 4067 19046 27 Volume of the main permanent pool(cubic feet) 124658 cf 36061 cf 16283 cf 66925 cf 28 Average depth of the main pool(feet) 3.40 ft 3.30 ft 4 ft 3.50 ft 29 Average depth equation used Equation 2 Equation 2 Equation 2 Equation 2 30 If using equation 3,main pool perimeter(feet) N/A N/A N/A N/A 31 If using equation 3,width of submerged veg.shelf(feet) N/A N/A N/A N/A 32 Volume of the forebay(cubic feet) 20643 cf 6280 cf 2963 cf 12947 cf 33 Is this 15-20%of the volume in the main pool? Yes Yes Yes Yes 34 Clean-out depth for forebay(inches) 48 in 48 in 36 in 48 in 35 Design volume of SCM(cu ft) 49853 cf 15167 cf 7785 cf 40299 cf 36 Is the outlet an orifice or a weir? orifice orifice orifice orifice 37 If orifice,orifice diameter(inches) 3.5 2 1.5 3 38 If weir,weir height(inches) 0 in 0 in 0 in 0 in 39 If weir,weir length(inches) 0 in 0 in 0 in 0 in 40 Drawdown time for the temporary pool(days) 3.36 3.02 2.73 2.92 41 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes Yes Yes circuiting? 42 Are berms or baffles provided to improve the flow path? Yes Yes Yes Yes 43 Depth of forebay at entrance(inches) 66 in 66 in 54 in 66 in 44 Depth of forebay at exit(inches) 54 in 54 in 42 in 54 in 45 Does water flow out of the forebay in a non-erosive manner? Yes Yes Yes Yes 46 Width of the vegetated shelf(feet) 6 ft 6 ft 6 ft 6 ft 47 Slope of vegetated shelf(H:V) 6:1 6:1 6:1 6:1 48 Does the orifice drawdown from below the top surface of the Yes Yes Yes Yes permanent pool? 49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes Yes Yes yr,24-hr storm? 50 Are fountains proposed?(If Y,please provide documentation that No No No No MDC(9)is met.) 51 Is a trash rack or other device provided to protect the outlet system? Yes Yes Yes Yes 52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes Yes Yes 53 Species of turf that will be used on the dam and embankment Centipede Grass Centipede Grass Centipede Grass Centipede Grass E 54 Has a planting plan been provided for the vegetated shelf? Yes Yes Yes Yes [DDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Wet Pond 3 1:48 PM 11/22/2022