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Home My WebLink AboutSW6210506_Supplement-EZ Form_20210528SUPPLEMENT-EZ COVER PAGE FORMS LOADED 1PROJECT INFORMATION 1 1 lProiectName 2 Project Area (ac) 3 Coastal Wetland Area (ac) 4 Surface Water Area (ac) 5 Is this project High or Low Density? 6 Does this project use an off -site SCM? Cotswold 19.1 0 2.45 No COMPLIANCE WITH 02H .1003(4) E=E 7 Width of vegetated setbacks provided (feet) n/a 8 Will the vegetated setback remain vegetated? 1 9 IlfBUA is proposed in the setback, does it meet NCAC 02H.1003(4)(c-d)? N/A 1 10 1 Is streambank stabilization proposed on this project? ...... . ............ NUMBER AND TYPE OF SCMs: I M 11 Infiltration ystem 12 Bioretention Cell 13 Wet Pond 2 14 Stormwater Wetland 15 Permeable Pavement 16 Sand Filte 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 StormFilte 24 Silva Cell I 1 25 113ayfilter IFilterra 1 26 I I FORMS LOADED IDESIGNER CERTIFICATION 27 Name and Title: 28 rganization: Scott Brown, PE - Vice President 4D Site Solutions, Inc. 29 Street address: 409 Chicago Drive, Suite 112 30 City, State, Zip: Fayetteville, NC 28306 1 31 JPhone number(s): 910-426-6777 1 32 JEmail: sbrown(a)4dsitesolutions.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. Seal Signature of Designer Date WETPOND [--fl Drainage area number 1 21Minimum required treal IGENERAL 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 Yes 7 Are the inlets, outlets, and receiving stream protected from erosion 1 (11 0-yea r storm)? Yes Yes 81's there an overflow or bypass for inflow volume in excess of the design volume? Yes Yes 91What is the method for clewatering 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)? N/A N/A 14 Is there an O&M Agreement that complies with General MDC (111)? I Yes Yes 151 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 17JWas the SCM designed by an NC licensed professional? Yes Yes WET POND MDC FROM 02H.1053 L 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) 284.50 284.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 285.50 285.00 221 Elevation of the bottom of the vegetated shelf (fmsl) 289.00 289.00 23 Elevation of the permanent pool (fmsl) 289.50 289.50 24 Elevation of the top of the vegetated shelf (fmsl) 290.00 290.00 25 Elevation of the temporary pool (fmsl) 292.09 291.09 26 Surface area of the main permanent pool (square feet) 8648 2186 27 Volume of the main permanent pool (cubic feet) 24933 cf 5140 cf 28 Average depth of the main pool (feet) 3.20 ft 3.21 ft 291Average depth equation used Equation 3 Equation 3 30 If using equation 3, main pool perimeter (feet) 407.8 ft 183.8 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) 4407 cf 869 cf 33 Is this 15-20% of the volume in the main pool? Yes Yes 34 Clean -out depth for forebay (inches) 12 in 12 in 35 Design volume of SCM (cu ft) 31705 cf 5356 cf 361 Is the outlet an orifice or a weir? Orifice Orifice 37 If orifice, orifice diameter (inches) 2.75 in 1.25 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 2 2.1 41 Are the inlet(s) and outlet located in a manner that avoids short- circuiting? Yes Yes 421Are berms or baffles provided to improve the flow path? No No 43 Depth of forebay at entrance (inches) 54 in 54 in 44 Depth of forebay at exit (inches) 48 in 48 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 I pe rma ne nt poo I? Yes Yes 49 Does the pond minimize impacts to the receiving channel from the 1- lyr, 24-hr storm? Yes Yes 50 Are fountains proposed? (If Y, please provide documentation that I MDC(9) is met.) No No 51 1 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 Centipede Centipede 54 Has a plantinq plan been provided for the vegetated shelf? Yes Yes ,ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about ithe wet pond(s): Wet Pond 1 4:07 PM 5/28/2021 DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 2 3 Does this oroiect h.". 1-.' '4-ih, areas? No 4 If so. number of 1--, 4-ify drainage areas 0 5 Is all/part of this project subject to previous rule versions? No I FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 4 Type of SCM Wet Pond Wet Pond 5 Total drainage area (sq ft) 591,964 97,762 6 Onsite drainage area (sq ft) 544,255 97,762 7 Offsite drainage area (sq ft) 47,709 8 Total BUA in project (sq ft) 291016 sf 50295 sf 9 New BUA on subdivided lots (subject to permitting) (sq ft) 148236 sf 32019 sf 10 New BUA not on subdivided lots (subject to permitting) (sf) 142780 sf 18276 sf 11 Offsite BUA (sq ft) 12 Breakdown of new BUA not on subdivided lots: Parking (sq ft) - Sidewalk (sq ft) Roof (sq ft) - Roadway (sq ft) 124469 sf 10736 sf Future (sq ft) - er, ease spec n e commen ox below (sq ft) 18311 sf 7540 sf 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 Ipermifting) (sq ft) 16 Existing BUA that is already permitted (sq ft) 17 Existing BUA that will be removed (sq ft) 18 Percent BUA 49% 51% 19 Design sto m (inches) 1.0 in 1.0 in 20 Design volume of SCM (cu ft) 31705 cf 5356 cf 21 Calculation method for design volume —J JADDITIONAL IN ORMATION 11111111F- JlPlease use this space to provide any additional information about the 22 drainage area(s): Simple Simple The other BUA listed is for the surface are of the wet pond which is considered as impervious