The URL can be used to link to this page

Home My WebLink AboutSW3240602_Supplement-EZ Form_20241023 SUPPLEMENT-EZ COVER PAGE FORMS LOADED 1PROJECT INFORMATION 1 Project Name Cottages at Wingate-Phase 1 2 Project Area(ac) 72.10 3 Coastal Wetland Area(ac) N/A 4 Surface Water Area(ac) 2.91 5 Is this project High or Low Density? High 6 Does this project use an off-site SCM? No COMPLIANCE WITH 02H.1003(4) mIM • 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 I Infiltration System 12 Bioretention Cell 13 Wet Pond 3 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 \\ \\\III11///i, \\\��N C A f' 0, N -7 5- Signature of Designer SEAL 04550 = /, E ..- I 10/23/2024 '/ // eea0C'' 1623/2024 Date 0/IIIIII\\\ DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so,number of drainage areas/SCMs 3 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 Type of SCM Wet Pond Wet Pond Wet Pond 5 Total drainage area(sq ft) 3,291,109 sf 1,194,724 sf 459,674 sf 233,461 sf 6 Onsite drainage area(sq ft) _ 3,267,436 sf 1,171,051 sf 459,674 sf 233,461 sf 7 Offsite drainage area(sq ft) 23,673 sf 23,673 sf 0 sf 0 sf 8 Total BUA in project(sq ft) 738,700 sf 498,248 sf 174,676 sf _ 65,776 sf New BUA on subdivided lots(subject to permitting) 9 (sq ft) 498,840 sf 331,323 sf 121,722 sf 45,795 sf New BUA not on subdivided lots(subject to 10 permitting)(sf) 216,187 sf 143,252 sf 52,954 sf 19,981 sf 11 Offsite BUA(sq ft) 23,673 sf 23,673 sf 0 sf 0 sf 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) 19,488 sf 19,488 sf 0 sf 0 sf -Sidewalk(sq ft) 7,334 sf 3,481 sf 2,318 sf 1,535 sf -Roof(sq ft) 0 sf 0 sf 0 sf 0 sf -Roadway(sq ft) 189,365 sf 120,283 sf 50,636 sf 18,446 sf -Future(sq ft) 0 sf 0 sf 0 sf 0 sf -Other,please specify in the comment box below(sq ft) 0 sf 0 sf 0 sf 0 sf New infiltrating permeable pavement on 13 subdivided lots(sq ft) 0 sf 0 sf 0 sf 0 sf New infiltrating permeable pavement not on 14 subdivided lots(sq ft) 0 sf 0 sf 0 sf 0 sf Existing BUA that will remain(not subject to 15 permitting)(sq ft) 0 sf 0 sf 0 sf 0 sf 16 Existing BUA that is already permitted(sq ft) 0 sf 0 sf 0 sf 0 sf 17 Existing BUA that will be removed(sq ft) 0 sf 0 sf 0 sf 0 sf 18 Percent BUA 22% 42% 38% 28% 19 Design storm(inches) 5.3 in 5.3 in 5.3 in 5.3 in 20 Design volume of SCM(cu ft) 111,344 cf 63,260 cf 15,167 cf 7,785 cf 21 Calculation method for design volume 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 2 Minimum required treatment volume(cu ft) 49,645 cf I 15,016 cf I 5,906 cf GENERAL MDC FROM 02H.1050 3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes Yes 4 Is the SCM located away from contaminated soils? Yes Yes Yes _ 5 What are the side slopes of the SCM(H:V)? 3:1 3:1 3:1 6 Does the SCM have retaining walls,gabion walls or other engineered No No No side slopes? 7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes Yes (10-year storm)? 8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes Yes design volume? 9 What is the method for dewatering the SCM for maintenance? _ Pump(preferred) Pump(preferred) Pump(preferred) 10 If applicable,will the SCM be cleaned out after construction? Yes Yes Yes _ 11 Does the maintenance access comply with General MDC(8)? Yes Yes Yes 12 Does the drainage easement comply with General MDC(9)? 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 General MDC(10)? 14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes Yes 15 Is there an O&M Plan that complies with General MDC(12)? _ Yes Yes _ Yes _ 16 Does the SCM follow the device specific MDC? Yes Yes Yes 17 Was the SCM designed by an NC licensed professional? Yes Yes Yes WET POND MDC FROM 02H.1053 • 18 Sizing method used SA/DA SA/DA SA/DA 19 Has a stage/storage table been provided in the calculations? _ Yes Yes Yes 20 Elevation of the excavated main pool depth(bottom of sediment 507.00 509.00 525.00 removal)(fmsl) 21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 508.00 510.00 526.00 22 Elevation of the bottom of the vegetated shelf(fmsl) _ 512.00 514.00 532.00 23 Elevation of the permanent pool(fmsl) 512.00 514.00 532.00 24 Elevation of the top of the vegetated shelf(fmsl) 513.00 515.00 533.00 _ 25 Elevation of the temporary pool(fmsl) 513.25 515.00 533.00 26 Surface area of the main permanent pool(square feet) 36,137 sf 10,853 sf 4,067 sf _ 27 Volume of the main permanent pool(cubic feet) 124,658 cf 36,061 cf _ 16,283 cf _ 28 Average depth of the main pool(feet) 3.40 ft 3.30 ft 4.00 ft _ 29 Average depth equation used Equation 2 Equation 2 _ Equation 2 _ 30 If using equation 3,main pool perimeter(feet) N/A N/A N/A 31 If using equation 3,width of submerged veg.shelf(feet) N/A N/A N/A 32 Volume of the forebay(cubic feet) 20,643 cf 6,280 cf 2,963 cf _ 33 Is this 15-20%of the volume in the main pool? Yes Yes _ Yes _ 34 Clean-out depth for forebay(inches) 48 in 48 in 36 in 35 Design volume of SCM(cu ft) 49,853 cf 15,167 cf 7,785 cf 36 Is the outlet an orifice or a weir? Orifice Orifice Orifice 37 If orifice,orifice diameter(inches) 3.5 in 2 in 1.5 in 38 If weir,weir height(inches) 0 in 0 in 0 in 39 If weir,weir length(inches) 0 in 0 in 0 in 40 Drawdown time for the temporary pool(days) 3.36 3.02 2.73 41 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes Yes circuiting? _ 42 Are berms or baffles provided to improve the flow path? — Yes Yes _ Yes _ 43 Depth of forebay at entrance(inches) 66 in 66 in 54 in 44 Depth of forebay at exit(inches) 54 in 54 in 42 in 45 Does water flow out of the forebay in a non-erosive manner? Yes Yes Yes 46 Width of the vegetated shelf(feet) _ 6 ft 6 ft 6 ft 47 Slope of vegetated shelf(H:V) — 6:1 6:1 6:1 _ 48 Does the orifice drawdown from below the top surface of the Yes Yes Yes permanent pool? _ 49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes Yes yr,24-hr storm? 50 Are fountains proposed?(If Y,please provide documentation that No No No MDC(9)is met.) 51 Is a trash rack or other device provided to protect the outlet system? Yes Yes Yes 52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes Yes 53 Species of turf that will be used on the dam and embankment Centipede Grass Centipede Grass _Centipede Grass 54 Has a planting plan been provided for the vegetated shelf? Yes Yes Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Wet Pond 3 11:36 AM 3/22/2024