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Home My WebLink AboutSW5221101_Supplement-EZ Form_20221117SUPPLEMENT EZ COVER PAGE, DRAINAGE AREAS FORM, WET POND FORM SUPPLEMENT-EZ COVER PAGE LOAD SUPPLEMENT FORMS I.#tOJECT INFORMATION 1 Project Name Cedar Creek Apartments 2 Project Area ac 11,06 3 Coastal Wetland Area ac 4 Surface Water Area ac .28 wet pond permanentpool) 5 Is this project High or Low Density? High 6 Does this project use an off -site SCM? No .O_ PLIA,�-W...ITH 02H .'100.3(4) 7 Width of vegetated setbacks provided feel NIA 8 Will the ve eta_ted setback remain vegetated? NIA 9 _ _ _ if BUA is proposed in the setback, does it meet NCAC 021-1.1003 4 c-d ? NIA 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 12 Bioretention Cell 13 Wet Pond 1 14 1 Stormwater Wetland 15 !Permeable Pavement 16 1 Sand Filter 17 !Rainwater Harvesting RWH i8 _ Green Roof 19 !LevelSpreader-Filter StriLS-F5 20 Disconnected Impervious Surface (DIS) 21 ;Treatment Swale 22 Dry Pond 23 Storm Filter 24 !Silva Cell 25 1 Ba filter 26 ---. Filterra -- ---- LOAD SUPPLEMENT FORMS DESIGNER CERTIFICATION 27 Name and Title: Phillip R Joyner, Jr. - Project Engineer 28. Organization: Mack Ga Associates, PA 29 Street address: Y 1667 Thomas A Betts Pk 30 _ City, State, Zip: Rocky Mount, NC 27804 31 Phone numbers : _ 252-446-3017 32 . Email: phillip@mackgaypa.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. �'Z 99 •cr�SS16 4, 1�� _ SEAL r; 03G348 ` a � R. J0-4a��,` Signature of Designer 17- ??- -Zo?Z DRAINAGE AREAS 1 Is this a hi h density project? Yes 2 1 If so, number of drains a 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 4 T pe of SCM Entire Site 1 Wet Pond 5 JTotal drainage area (sq ft) 334976.4 6 lOnsite drainage area (sq ft 334976.4 7 Offsite drainage area (sq ft 8 Total BUA in project sq ft 62547 sf 9 New BUA on subdivided lots (subject to permitting) (sq ft) 10 New BUA not on subdivided lots (subject to permitting) s 62547 sf 11 Offsite BUA (sq ft 12 Breakdown of new BUA not on subdivided lots: - Parkin (sq ft) 40740 sf - Sidewalk (sq ft) 5431 sf - Roof (sq ft 16376 sf - Roadway (sq ft) - 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 permitting) (sq ft xistin BUA that is ahead permitted sq ft} xistin BUA that will be removed s ft ercent BUA 19% Design storm inches) 1.0 in KADDITIONAL esign volume of SCM cu ft) 6492 cf alculation method for design volume Simple Method INFORMATION lease use this space to provide any additional information about the rainage area(s): WET POND Drainage area number 1 2 P1 Minimum required treatment volume cu ft 6078 cf ENERAE 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.wr other engineered side slopes? No 7 Are the inlets, outlets, and receiving stream protected from erosion 1 (0- ear storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes 9 What is the method for dewatering the SCM for maintenance? Other 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)? 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 16 Does the SCM follow the device specific MDC? Yes 17 Was the SCM desi ned bj an NC licensedprofessional? 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) 423.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 424.00 22 Elevation of the bottom of the vegetated shelf (fmsl) 429.00 231 Elevation of the permanent pool (fmsl) 429.00 241 Elevation of the top of the vegetated shelf (fmsl) 430.00 25 Elevation of the temporary pool (fmsl) 429.46 26 Surface area of the main permanent pool (square.feet) 9441 27 Volume of the main permanent pool (cubic feet) 42059 cf 28 Average depth of the main pool (feet) 4.50 ft 29 Average depth equation used Equation 2 301 If using equation 3, main pool perimeter (feet) 311 If using equation 3, width of submerged veg. shelf (feet) 32 Volume of the forebay (cubic feet) 6990 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) 116164 cf 36 is the outlet an orifice or a weir? Orifice Wet Pond 1 8.37 AM 9/15/2022 WET POND 37 If orifice, orifice diameter (inches) 1.8 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 2.6 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? No 43 Depth of forebay at entrance (inches) 48 in 44 Depth of forebay at exit (inches) 24 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 permanent pool? Yes 49 Does the pond minimize impacts to the receiving channel from the 1- lyr, 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 54 Hasa Clanting Elan been Erovided for the vegetated shelf? Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Drain Ei ing with valve is installed for dewaterin �R Wet Pond 2 8:37 AM 9/15/2022