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Home My WebLink About20221617 Ver 2_Supp EZ Form_20230907SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 lProiect Name 1 2 1 Proiect Area (ac) 3 Coastal Wetland Area (ac) 4 Surface Water Area (ac) 5 Is this project High or Low Density? 6 Does this protect use an off -site SCM? Eastfield Crossing, Block C 117.7 0 0 High No COMPLIANCE WITH 02H .1003(4) 7 Width of vegetated setbacks provided (feet) 50 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 1 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: 28 Organization: 29 Street address: 30 City, State, Zip: 31 Phone number(s): 32 1 Email: 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. ,0A CARO o�'F6S0 •.�'L SEAL - 055810 _ o'•.F /Z •.NGINES.••-O 4 S. DOS /'11ItG��• Signature of Designer 8/14/2023 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 5 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 3 4 4 Type of SCM Wet Pond A2 Wet Pond A3 Wet Pond C1 Wet Pond C2 5 Total drainage area (sq ft) 4328287 1547451 245644 1698840 836352 6 Onsite drainage area (sq ft 4032031 1547451 245644 1406355 832581 7 Offsite drainage area (sq ft) 296256 292485 3771 8 Total BUA in project (sq ft 1173630 1173630 sf 9 New BUA on subdivided lots (subject to permitting) (sq ft) 399010 399010 sf 10permitting) New BUA not on subdivided lots (subject to sf 2965611 1038947 sf 173780 sf 978264 sf 774620 sf 11 Offsite BUA (sq ft) 12 Breakdown of new BUA not on subdivided lots: Parking (sq ft) 1396512 626034 sf 141195 sf 341876 sf 287407 sf Sidewalk (sq ft 76562 55975 sf 20587 sf Roof (sq ft) 625082 238358 sf 11998 sf 374726 sf Roadway s ft 393867 118580 sf 261662 sf 13625 sf Future (sq ft) Other, please specify in the comment box below (sq ft 473588 sf 13 New infiltrating permeable pavement on subdivided lots (sq ft) 14 New infiltrating permeable pavement not on Isubdivided lots (sq ft 15 Existing BUA that will remain (not subject to permitting) (sq ft) 16 Existin BUA that is already permitted (sq ft 17 Existing BUA that will be removed (sq ft) 18 Percent BUA 78% 67% 71% 58% 140% 19 Design storm (inches) 1 in tin 1 in tin 1 in 20 1 Design volume of SCM cu ft 144619 cf 124446 cf 20173 cf 132873 cf 63865 cf 21 1 Calculation method for design volume 1 Simple Method Simple Method 1 Simple Method 1 Simple Method 1 Simple Method ADDITIONAL INFORMATION 22 Please use this space to provide any additional information about the drainage area(s): WET POND 1 1 2 1 3 1 4 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 side slopes? No No No No 7 Are the inlets, outlets, and receiving stream protected from erosion (10-year storm)? Yes Yes Yes Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes Yes Yes Yes 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 General MDC (10)? N/A N/A N/A N/A 14 Is there an O&M Agreement that complies with General MDC (11)? Yes Yes Yes Yes 15I s there an O&M Plan that complies with General MDC (12)? Yes Yes Yes Yes 161 Does the SCM follow the device specific MDC? Yes Yes Yes Yes 17 Was the SCM desi ned b an NC licensed professional? Yes Yes Yes Yes WET POND MD[ FROM 02H _107 18 Sizing method used SA/DA SA/DA HRT HRT 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 removal) (fmsl) 163.25 164.00 161.00 162.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 163.75 164.50 161.50 162.50 221 Elevation of the bottom of the vegetated shelf (fmsl) 166.75 169.50 165.00 165.50 23 Elevation of the permanent pool (fmsl) 167.25 170.00 164.50 1166.75 24 Elevation of the top of the vegetated shelf (fmsl) 167.75 170.50 166.00 166.50 25 Elevation of the temporary pool (fmsl) 167.81 170.82 165.50 168.00 26 Surface area of the main permanent pool (square feet) 208261 22883 129349 48195 27 Volume of the main permanent pool (cubic feet) 520306 cf 69893 cf 363619 cf 148003 cf 28 Average depth of the main pool (feet) 3.00 ft 4.00 ft 2.81 ft 3.07 ft 29 Average depth equation used Equation 3 Equation 3 Equation 2 Equation 2 301 If using equation 3, main pool perimeter (feet) 4334.0 ft 731.0 ft 31 If using equation 3, width of submerged veg. shelf (feet) 3.0 ft 3.0 ft 32 Volume of the forebay (cubic feet) 73635 cf 82821 cf 82981 cf 162314 cf 33 Is this 15-20% of the volume in the main pool? Yes Yes Yes Yes 34 Clean -out depth for forebay (inches) 6 in 6 in 6 in 6 in 35 Design volume of SCM (cu ft) 869331 cf 130318 cf 132873 cf 63865 cf 36 Is the outlet an orifice or a weir? Orifice Orifice Orifice Orifice 371 If orifice, orifice diameter (inches) 8 in 2 in 4 in 3 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 3 4.5 3.35 2.74 41 Are the inlet(s) and outlet located in a manner that avoids short- circuiting? Yes Yes Yes Yes 42 Are berms or baffles provided to improve the flow path? No No No No 431 Depth of forebay at entrance (inches) 164 in 165 in 48 in 42 in 441 Depth of forebay at exit (inches) 164 in 165 in 48 in 42 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 permanent pool? Yes Yes Yes Yes 49 Does the pond minimize impacts to the receiving channel from the 1- yr, 24-hr storm? Yes Yes Yes Yes 50 Are fountains proposed? (If Y, please provide documentation that MDC(9) is met.) No No No No 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 Clean Crop Seed Clean Crop Seed Clean Crop Seed Clean Crop Seed 54 Hasa planting plan been provided for the vegetated shelf? Yes Yes Yes Yes IITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet Dond(s): Wet Pond 3 12:52 PM 8/14/2023