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Home My WebLink About2023-02-23 Lot 9 Wet Pond SupplementSUPPLEMENT-EZ COVER PAGE FORMS LOADED 71 PROJECT INFORMATION 1 Project Name CCEP - Lot #9 2 Project Area ac 18.57 3 Coastal Wetland Area ac 0 4 Surface Water Area ac 0 5 Is this project High or Low Density? High 6 1 Does this project use an off -site SCM? No COMPLIANCE WITH 02H .1003(4) 7 Width of vegetated setbacks provided feet 25 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 ? No 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 0 12 Bioretention Cell 0 13 Wet Pond 1 14 Stormwater Wetland 0 15 Permeable Pavement 0 16 1Sand Filter 0 17 lRainwater 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 Dry Pond 0 23 StormFilter 0 24 iSilva Cell 0 25 Bayfilter 0 26 IFilterra 0 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Jacob Hudson PE - Project Engineer 28 Organization: CE Group, Inc. 29 Street address: 301 Glenwood Avenue Suite 220 30 City, State, Zip: Phone numbers : Email: Raleigh, NC 27603 31 919 367-8790 ext. 110 32 Jacob@CEGroupinc.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 Designer \\��I►Illfriiii CARO o % o..oFE 2. a SEAL 050755 = 08 Z7��„ ► I f I, `�� Sea Signatur of signer Date 02 - 2 3 - 2d23 DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 1 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 4 Type of SCM Wet Pond 5 Total drainage area (sq ft 394702 394702 6 Onsite drainage area (sq ft 394702 394702 7 Offsite drainage area (sq ft 8 Total BUA in project (sq ft 260547 sf 260547 sf 9 New BUA on subdivided lots (subject to permitting) (scl 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 16230 sf 16230 sf - Sidewalk (sq ft 1915 sf 1915 sf Roof (sq ft 117185 sf 117185 sf - Roadway s ft 11180 sf 11180 sf - Future (sq ft 57753 sf 57753 sf - Other, please specify in the comment box below (sq ft 56284 sf 56284 sf 13 New infiltrating permeable pavement on subdivided lots (sq ft 14 New infiltrating permeable pavement not on Isubdivided lots (sq ft 15permitting) Existing BUA that will remain (not subject to s ft 16 Existing BUA that is already permitted (sq ft 17 Existing BUA that will be removed (sq ft 18 Percent BUA 32% 66% 19 Desi n storm inches 1.0 in 20 1 Design volume of SCM cu ft 21186 cf 21 lCalculation method for design volume I Simple IPlease use this space to provide any additional information about the 22 1drainage area(s): -oadinq Dock Area and Gravel Fire Access Drive WET PON D 1 Drainage area number 1 21 Minimum required treatment volume cu ft 21186 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 referred 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 ? NIA 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 17 Was the SCM designed by an NC licensedprofessional? Yes PO 18 DMQC FROM 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 237.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 238.00 22 Elevation of the bottom of the vegetated shelf (fmsl) 243.00 23 Elevation of the permanent pool fmsl) 243.50 24 Elevation of the top of the vegetated shelf (fmsl) 244.00 25 Elevation of the temporary pool (fmsl) 245,50 26 Surface area of the main permanent pool (square feet) 11175 27 Volume of the main permanent pool cubic feet) 35574 cf 28 jAverage depth of the main pool (feet) 3.18 ft 29 Average depth equation used Equation 2 30 If using equation 3, main pool perimeter (feet) 31 If using equation 3, width of submerged veg. shelf (feet) 32 Volume of the forebay (cubic feet) 5789 cf 33 Is this 15-20% of the volume in the main pool? Yes 34 Clean -out depth for forebay (inches) 12 in 351 Design volume of SCM (cu ft) 33119 cf 36 Is the outlet an orifice or a weir? Weir 37 If orifice, orifice diameter (inches) 38 If weir, weir height (inches) 6 in 39 If weir, weir length (inches) 48 in 40 Drawdown time for the temporary pool (days) 3 41 Are the inlet(s) and outlet located in a manner that avoids short- arcuitin ? Yes 42 Are berms or baffles provided to improve the flow path? Yes 43 Depth of forebay at entrance (inches) 42 in 44 Dept of forebay at exit (inches) 36 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 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 IV a 55 Please use this space to provide any additional information about the wet pond(s): 4:31 PM 2/23/2023