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Home My WebLink AboutSW6220504_Supplement-EZ Form_20220606SUPPLEMENT-EZ COVER PAGE M MS WAKD PROJECT INFORMATION i 1 Project Name Cameron Village 2 Pro act Area ae 42.3088 - 3 Coastal Wetland Area ac 4 Surface Water Area ac - 5 Is this project High or Low Den slt ? High 6 1 Does this project use an off -site SCM? No COMPLIANCE WITH 02H .1003(4 Width of vegetated setbacks provided feet N/A 8 Will the vegetated setback rerrlaln vegetated? N/A 9 0107 If BUA is proposed in the setback, does it meet NCAC 02H.1003 4 c-d ? No Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMS: Infiltration System 0 12 Bioretention Ceil 0 E1511 13 Wet Pond 2 14 Stormwater Wetland 0 Permeable Pavement 0 16 Sand Filter 0 17 Rainwater Harvesting(RWH 0 ._ 18 Green Roof 0 19 Level spreader -Filter Strip LS-FS 0 20 Disconnected Impervious Surface (DIS) 0 21 Treatment Swale 0 _ 22 D Pond 0 23 StormFilter 0 24 Silva Cell 0 25 Bayfilter 0 26 Filterra 1 0 F RM L-0 DED DESIGNER CERTIFICATION 27 Name and Title: Carlo Pardo, PE 28 Organization: Bowman North Carolina, Ltd. 29 Street address: 4004 Barrett Drive, Suite 101 30 City, State, Zip: Raleigh. NC 27609. 31 Phone number(s): 919-553-6570 32 Email: cpardo@bowman.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. A h' �( •��ri �d4a��.s5i�1 ��yf' a V _ SEAL _ i ❑51571 r � /1/trllF�ia111 Signature of Designer - 10/51/9/2- Date DRAINAGE AREAS 1 Is this a high density r9ject? Yes 2 If so, number of drainage areas/SCMs 2 3 Does this project have low density areas? No 4 If so, number of low density draina a areas 0 5 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 4 Type of SCM - Wet Pond Wet Pond 5 Total drainage area (sq ft 1842972 sf 1141886 sf 552343 sf 6 Onsite drainage areas ft 1842972 sf 1141886 sf 552343 sf 7 Offsite drainage area (sq ft 8 Total BUA in project (sq ft) 735961 sf 475548 sf 260413 sf 9 New BUA on subdivided lots (subject to permitting) (sq ft 10permitting) New BUA not on subdivided lots (subject to s 11 Offsite BUA (sq ft 12 Breakdown of new BUA not on subdivided lots: Parking (sq ft Sidewalk (sq ft 65294 sf 46590 sf 18704 sf Roof (sq ft 496000 sf 308000 sf 188000 sf Roadway s ft 164649 sf 110940 sf 53709 sf Future (sq ft Other, please specify in the comment box below Jpq ft 10018 sf 10018 sf 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 17230 sf 16 Existing BUA that is already permitted (sq ft) 17 Existing BUA that will be removed (sq ft 18 Percent BUA 41.65% 47.15% Desi n storm inches 1.0 in 1.0 in L Desi nvolume of SCM (cu ft) 40424 cf 21832cf Calculation method for design volume Simple Method Simple Method ADDITIONAL INFORMATION 22 Please use this space to provide any additional information about the drainage area(s): Drainage Area #1 - Pool Impervious Area = 10,018sf Drainage Area #1 has been designed for an area of 1,866,124 sf with an impervious area of 900,331 sf The future phase includes an additional 724,238 sf of drainage area with an additional impervious area of 424,783 sf WET POND 1 Drainage area number i 1 2 2 Minimum re uired treatment volume cu ft) 40424 cf 21832 of GENE RAL MDC FROM 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 design volume? Yes Yes 9 What is the method for dewatering the SCM for maintenance? Pum referred 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 ? N/A NIA 14 Is there an O&M Agreement that complies with General MDC (11)? Yes Yes 15 Is there an O&M Plan that complies with General MDC (12)? Yes Yes 161 Does the SCM follow the devicespecific MDC? Yes Yes 17 Was the SCM designed by an NC licensedprofessional? Yes Yes WET POND MDC FROM 02H .1053 18 Sizing method used SAIDA S)VDA 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 251.00 250.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 252.00 251.00 22 Elevation of the bottom of the vegetated shelf (fmsl) 255.50 254.50 23 Elevation of the permanent pool fmsl 256.00 255.00 24 Elevation of the top of the vegetated shelf (fmsl) 256.50 255.50 25 Elevation of the temporary pool fmsl 257.00 255.90 26 Surface area of the main permanent pool (square feet) 51435 18440 27 Volume of the main permanent pool cubic feet 183364 cf 60353 of 28 Average depth of the main pool (feet) 3.76 ft 3.59 ft 29 Average depth euation used Equation 3 Equation 3 30 If using equation 3, main pool perimeter (feet) 975.0 ft 593.0 ft 31 If using equation 3, width of submerged veg. shelf (feet) 3.0 ft 3.0 ft 32 Volume of the foreba (cubic feet) 35620 cf 9396 cf 331 Is this 15-20% of the volume in the mainpool? Yes Yes 34 Clean -out depth for foreba (inches) 24 in 24 in 35 Design volume of SCM (cu ft) 40424 of 21832 of 36 Is the outlet an orifice or a weir? Orifice Orifice 37 If orifice, orifice diameter inches 5.0 in 2.50 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 2.06 2.36 41 Are the inlet(s) and outlet located in a manner that avoids short- circuiting? Yes Yes 42 Are berms or baffles provided to improve the flowpath? Yes Yes 43 Depth of forebay at entrance (inches) 36 in 36 in 44 Depth of forebay at exit inches 30 in 30 in 45 Does water flow out of the forebayin a non -erosive manner? Yes Yes 46 Width of the vegetated shelf (feet) 6 ft 6 ft 47 Slope of vegetated shelf (H: 6:1 6:1 48 Does the orifice drawdown from below the top surface of the permanentpool? 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 S ecies of turf that will be used on the dam and embankment H brid Bermuda Hybrid Bermuda 54 Hasa alantin Ian been rovided for the ve etated shelf? Yes Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Wet Pond , 8-21 AM 1/5/2022