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Home My WebLink AboutSW6211205_Supplement-EZ Form_20220712SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name BROOKSTONE VILLAGE 2 Project Area ec 60.64 3 Coastal Welland Area ac 0 4 Surface Water Area ac 0 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 lWidth 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 SCM9: Infiltration S tem Bioretention Cell Wet PondStormwater Welland r Permeable Pavement Sand Filter Ralmvater Harvestin RWHGreen Roof 19 Level Spreader -Filter p Strip LS-FS 20 Disconnected Impewious Surface DIS 21 Treatment Swale 22 Dry Pond 23 Sto mi'ilter 24 Silva Cell 25 Be i0er 26 Fitiema FORMS LOADED DESIGNER CERTIFICATION 27 Name and This: Andraw Richards, PE 28 Or anization: Paremounte Engineering, Inc. 29 Street address: 122 Cinema Dr. 30 Cl State, ZI : Wilmington, NC 28403 31 Phorre num s : 910-791-6707 32 Email: adchards@paramounte-eng.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. Irk ' E S/OOI/ 2:Q� 7 SEAL Z : 052507 Q :O •'•FiyGINif /1�//E Sig re of De ner 3/Z 3 ZvZz 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 GE AREA INFORMATION Entire Site 1 4 Type of SCM WET POND 5 Total drainage area (sq ft 2641478 2565939 6 Onsite drainage area (sq ft 2633164 2557625 7 Offsite drainage area (sq ft 8314 8314 8 Total BUA in project (sq ft 1380437 sf 1380437 sf 9permitting) New BUA on subdivided lots (subject to s ft 239580 sf 239580 sf 10permitting) New BUA not on subdivided lots (subject to sf 1140857 sf 1140857 sf 11 Offsite BUA (sq ft 8314 sf 8314 sf 12 1 Breakdown of new BUA not on subdivided lots: Parking (sq ft Sidewalk (sq ft 13939 sf 13939 sf Roof (sq ft Roadway s ft 67518 sf 67518 sf Future (sq ft 1051086 sf 1051086 sf 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 15permitting) Existing BUA that will remain (not subject to s ft 16 1 Existing BUA that is already permitted (sq ft 17 Existing BUA that will be removed (sq ft 18 Percent BUA 52% 54% 19 Design storm inches 1" 20 Design volume of SCM cu ft 207792 cf 21 Calculation method for design volume SIMPLE ADDITIONAL INFORMATION 22 Please use this space to provide any additional information about the drainage area(s): I WET POND 11 Drainage area number 1 21 Minimum required treatment volume cu ft 114187 cf GENERAL MDC FROM 02H .1050 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 171 Was the SCM designed by an NC licensed rofessional? 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 234.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 235.00 221 Elevation of the bottom of the vegetated shelf (fmsl) 240.00 231 Elevation of the permanent pool (fmsl) 241.00 24 Elevation of the top of the vegetated shelf (fmsl) 241.00 25 Elevation of the temporary pool (fmsl) 243.50 26 Surface area of the main permanent pool (square feet) 57355 27 Volume of the main permanent pool (cubic feet) 265380 cf 28 Average depth of the main pool (feet) 5.20 ft 29 Average depth equation used Equation 3 301 If using equation 3, main pool perimeter (feet) 1119.0 ft 31 If using equation 3, width of submerged veg. shelf (feet) 6.0 ft 32 Volume of the forebay (cubic feet) 50688 cf 33 Is this 15-20% of the volume in the main pool? Yes 34 Clean -out depth for forebay (inches) 12 in 35 Design volume of SCM (cu ft) 207792 cf 36 Is the outlet an orifice or a weir? Orifice 371 If orifice, orifice diameter (inches) 6 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 2.94 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? Yes 431 Depth of forebay at entrance (inches) 60 in 44 Depth of forebay at exit (inches) 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 1 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 BERMUDA 54 Hasa planting 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 3 4:29 PM 6/29/2022