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Home My WebLink About20221617 Ver 1_02 - Block A - Supplemental EZ - Signed_20230301SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION Project Name 2 r1 Project Area ac 3 Coastal Wetland Area 4 Surface Water Area (a Eastfield Retail 46.48 5 1 Is this project High or Low Density? High 6 1 Does this protect use an off -site SCM? 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 ? 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration S stem 12 Bioretention Cell 13 Wet Pond 2 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 lBayfilter 26 IFilterra FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Charlie Yowell 28 Or anization: Bohler Engineering 29 Street address: 4130 Parklake Avenue #130 30 City, State, Zip: Raleigh, NC 27612 31 Phone numbers : 919-578-9000 32 Email: cyowell@bohlereng.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. Signature of Designer 2/28/2023 Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 2 3 Does this roiect have low H—ify 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 AREA INFORMATION Entire Site 1 2 4 Type of SCM Wetpond Wetpond 5 Total drainage area (sq ft 1793095 sf 1547451 sf 245644 6 Onsite drainage area (sq ft 1793095 sf 1547451 245644 7 Offsite drainage area (sq ft 8 Total BUA in project (sq ft) 1212727 sf 1038947 sf 173780 sf 9permitting) New BUA on subdivided lots (subject to s ft 10permitting) New BUA not on subdivided lots (subject to sf 1212727 sf 1038947 sf 173780 sf 11 Offsite BUA (sq ft 12 Breakdown of new BUA not on subdivided lots: Parking (sq ft 767229 sf 626034 sf 141195 sf Sidewalk (sq ft 76562 sf 55975 sf 20587 sf Roof (sq ft 250356 sf 238358 sf 11998 sf Roadway s ft 118580 sf 118580 sf Future (sq ft 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 15 Existing BUA that will remain (not subject to ermitting) (sq ft 16 Existing BUA that is already permitted (sq ft 17 Existing BUA that will be removed (sq ft 18 Percent BUA 68% 67% 71 % 19 Design storm inches 1.0 in 1.0 in 1.0 in 20 Design volume of SCM cu ft 144619 sf 124446 cf 20173 cf 21 Calculation method for design volume Simple Method Simple Method Simple Method ADDITIONAL INFORMATION 22 Please use this space to provide any additional information about the drainage area(s): WET POND area number ERAL MDC ISM 02H .1050 3 Is the SCM sized to treat the SW from all surfaces at build -out? Yes Yes 4 Is the SCM located away from contaminated soils? Yes Yes 5 What are the side slopes of the SCM (H:V)? 3:1 3:1 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No No 7 Are the inlets, outlets, and receiving stream protected from erosion 10- ear storm)? Yes Yes 8 Is there an overflow or bypass for inflow volume in excess of the desi n volume? Yes Yes 9 What is the method for dewatering the SCM for maintenance? Pump (preferred) Pump (preferred) 10 If applicable, will the SCM be cleaned out after construction? Yes Yes 11 Does the maintenance access comply with General MDC (8)? Yes Yes 12 Does the drainage easement comply with General MDC (9)? Yes Yes 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC 10 ? Is there an O&M Agreement that complies with General MDC (11)? N/A N/A 14 Yes Yes 15 Is there an O&M Plan that complies with General MDC (12)? Yes Yes 161 Does the SCM follow the device specific MDC? Yes Yes 17 Was the SCM designed by an NC licensedprofessional? Yes Yes 18 Sizing method used SA/DA SA/DA 19 Has a stage/storage table been provided in the calculations? Yes Yes 20 Elevation of the excavated main pool depth (bottom of sediment removal) (fmsl 163.25 164.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 163.75 164.50 22 Elevation of the bottom of the vegetated shelf (fmsl) 166.75 169.50 23 Elevation of the permanent pool (fmsl) 167.25 170.00 24 Elevation of the top of the vegetated shelf (fmsl) 167.75 170.50 25 Elevation of the temporary pool (fmsl) 167.81 170.82 26 Surface area of the main permanent pool (square feet) 208261 22883 27 Volume of the main permanent pool (cubic feet) 520306 cf 69893 cf 28 Average depth of the main pool (feet) 3.00 ft 4.00 ft 29 Average depth equation used Equation 3 Equation 3 30 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 33 Is this 15-20% of the volume in the main pool? Yes Yes 34 Clean -out depth for forebay (inches) 6 in 6 in 351 Design volume of SCM (cu ft) 869331 cf 130318 cf 36 Is the outlet an orifice or a weir? Orifice Orifice 37 If orifice, orifice diameter (inches) 8 in 2 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 3 4.5 41 Are the inlet(s) and outlet located in a manner that avoids short- arcuitin ? Yes Yes 42 Are berms or baffles provided to improve the flow path? No No 43 Depth of forebay at entrance (inches) 164.25 in 164.50 in 44 Depth of forebay at exit (inches) 164.25 in 164.50 in 45 Does water flow out of the forebay in a non -erosive manner? Yes Yes 46 Width of the vegetated shelf (feet) 6 ft 6 ft 47 Slope of vegetated shelf (H:V) 6:1 6:1 48 Does the orifice drawdown from below the top surface of the ermanent pooI? Yes Yes 49 Does the pond minimize impacts to the receiving channel from the 1- r, 24-hr storm? Yes Yes 50 Are fountains proposed? (If Y, please provide documentation that MDC 9 is met. No No 51 Is a trash rack or other device provided to protect the outlet system? Yes Yes 52 Are the dam and embankment planted in non -clumping turf grass? Yes Yes 53 Species of turf that will be used on the dam and embankment Clean Crop Seed Clean Crop Seed 54 Hasa plantinq plan been provided for the vegetated shelf? Yes Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Wet Pond 3 10:36 AM 2/28/2023