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Home My WebLink AboutSW6211201_Supplement-EZ Form_20220128SUPPLEMENT-EZ COVER PAGE LOAD SUPPLEMENT FORMS PROJECT INFORMATION 1 Project Name The Glen 2 Project Area ac 11.18 3 Coastal Wetland Area ac 0 4 Surface Water Area (ac) 0.4 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) 30 feet 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 1 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 IDry Pond 23 StormFilter 24 Silva Cell 25 Bayfilter 26 Filterra LOAD SUPPLEMENT FORMS DESIGNER CERTIFICATION 27 Name and Title: Andrew S Petty, VP 28 Organization: Curry Engineering Group, PLLC 29 Street address: 205 South Fuquay Avenue 30 City, State, Zip: Fuquay-Varina, NC 31 Phone number(s): 919-552-0849 32 Email: andy@curryeng.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. g �FESS 1 ��✓�r'_ SEAL 36823 G 2022.01.27 11.06.08 - 05'00' Date 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 1 4 Type of SCM N/A Wet Pond 5 Total drainage area (sq ft 487000.8 328007 6 Onsite drainage area (sq ft 487000.8 328007 7 Offsite drainage area (sq ft - 8 Total BUA in project (sq ft) 121704 sf 121704 sf 9 New BUA on subdivided lots (subject to ermitting) (sq ft 82500 sf 82500 sf 10permitting) New BUA not on subdivided lots (subject to s 39204 sf 39204 sf 11 Offsite BUA (sq ft - 12 Breakdown of new BUA not on subdivided lots: - - - Parking (sq ft 34848 sf 34848 sf - Sidewalk (sq ft 4356 sf 4356 sf - Roofs ft - - - Roadway s ft - - Future (sq ft - - Other, please specify in the comment box below (sq ft) - 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 25% 37% 19 Design storm inches 1.0 in 20 Design volume of SCM cu ft 13035 cf 21 Calculation method for design volume Simple ADDITIONAL INFORMATION 22 Please use this space to provide any additional information about the drainage area(s): WET POND 1 Drainage area number 1 2 Minimum required treatment volume cu ft 10494 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 design volume? Yes 9 What is the method for dewatering the SCM for maintenance? Pump (preferred) 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 ? N/A 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 WET POND MDC FROM 021H .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 71.50 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 72.00 22 Elevation of the bottom of the vegetated shelf (fmsl) 77.00 23 Elevation of the permanent pool fmsl 77.50 24 Elevation of the top of the vegetated shelf (fmsl) 78.00 25 Elevation of the temporary pool (fmsl) 78.50 26 Surface area of the main permanent pool (square feet) 8089 27 Volume of the main permanent pool cubic feet 26772 cf 28 Average depth of the main pool (feet) 4.03 ft 29 Average depth equation used Equation 3 301 If using equation 3, main pool perimeter (feet) 406.0 ft 31 If using a uation 3, width of submerged veg. shelf feet 3.0 ft 32 Volume of the forebay (cubic feet) 5070 cf 33 Is this 15-20% of the volume in the main pool? Yes 34 Clean -out depth for forebay (inches) 30 in 35 Design volume of SCM cu ft 13035 cf 36 Is the outlet an orifice or a weir? Orifice 371 If orifice, orifice diameter (inches) 2 in 38 If weir, weir height (inches) 39 If weir, weir length inches Drawdown time for the temporary pool (days) Are the inlet(s) and outlet located in a manner that avoids short- circuiting? 40 2.49 41 Yes 42 Are berms or baffles provided to improve the flowpath? Yes 43 Depth of forebay at entrance (inches) 36 in 44 Depth of forebay at exit (inches) 18 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- yr, 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 Centipede 541 Hasa planting plan been provided for the vegetated shelf? Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Wet Pond 3 11:05 AM 1/27/2022