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Home My WebLink AboutSW3230301_Supplement-EZ Form_20230309SUPPLEMENT-EZ COVER PAGE FORMS LOADED (PROJECT INFORMATION Name Area (ac) Wetland Area Water Area (e Kerns Rii 71.06 1.79 5 1 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 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 lis streambank stabilization proposed on this project? No NUMBER AND TYPE SCMs: 11 Infiltration System 12 Bioretention Cell 13 Wet Pond 2 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 Dry Pond 23 StormFilter 24 Silva Cell 25 Bayfilter 26 lFilterra FORMS LOADED SIGNER CERTIFICATION 27 Name and Title: Clayton Blackwell, PE 28 Organization: McKim & Creed, Inc. 29 Street address: 8020 Tower Point Drive 30 City, State, Zip: Charlotte, NC 28227 31 1 Phone number(s): 704-945-3345 32 Email: jlackwell@mckimcreed.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. Signature of Designer Seal 01110/23 Date DRAINAGE AREAS 1 Is this a high density project? 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 drainage 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) 416869 1261062 6 Onsite drainage area (sq ft) 416869 1261062 7 Offsite drainage area (sq ft) 0 0 8 Total BUA in project (sq ft) 738340 sf 165350 sf 572990 sf 9 New BUA on subdivided lots (subject to permitting) (sq ft) 453600 sf 104400 sf 349200 sf 10 New BUA not on subdivided lots (subject to permitting) (sf) 284740 sf 60950 sf 223790 sf 11 Offsite BUA (sq ft) 12 Breakdown of new BUA not on subdivided lots: - Parking (sq ft) 18900 sf 4350 sf 14550 sf - Sidewalk (sq ft) - Roof (sq ft) - Roadway (sq ft) 236340 sf 56600 sf 179740 sf - Future (sq ft) 29500 sf 29500 sf - 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) 16 Existing BUA that is already permitted (sq ft) 17 Existing BUA that will be removed (sq ft) 18 Percent BUA 24 % 40 % 45 19 Design storm (inches) 1.0 in 1.0 in 20 Design volume of SCM (cu ft) 15475 cf 44962 cf 21 ICalculation method for design volume SA/DA Method SA/DA Method ADDITIONAL INFORMATION 22 Please use this space to provide any additional information about the drainage area(s): WET POND 1 Draina a area number 1 2 Minimum required treatmentvolume cu ft 15475 cf GENERAL MDC FROM 02H .1050 Is the SCM sized to treat the SW from all surfaces at build -out? Yes 3 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 en ines ed 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 dewaterin the SCM for maintenance? Pum ref! erred If applicable, will the SCM be cleaned out after construction? Yes 11 Does the maintenance access complywith General MDC 8 ? Yes 12 Does the drainage easement complywith General MDC 9 ? Yes 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC 10 Yes 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 devicespecific MDC? Yes 17 Was the SCM desi ned bv an NC licensedprofessional? Yes WET POND MDC FROM 02H .1053 18 Sizing method used 19 Has a stage/storage table been provided in the calculations? 20 Elevation of the excavated main pool depth (bottom of sediment0 removal fmsl 21 Elevation of the main pool bottom to of sediment removal fmsl0 22 Elevation of the bottom of the vegetated shelf fmsl 0 23 Elevation of the permanent pool fmsl 0 24 Elevation of the to of the vegetated shelf fmsl 0 F 25 Elevation of the temporary pool fmsl 0 26 Surface area of the main permanent pool (square feet 8 27 Volume of the main permanent pool cubic feet cf 28 Average depth of the main pool feet 29 Average depth euation used n 2 30 If usingequation 3 main pool perimeter feet 31 If usingequation 3, width of submerged veg. shelf feet 32 Volume of the foreba cubic feet 9768 cf 33 Is this 15-20 % of the volume in the main pool? Yes 34 Clean -out depth for foreba inches 12 in 35 Design volume of SCM cu ft 16754 cf 36 Is the outlet an orifice or a weir? Orifice 37 If orifice, orifice diameter inches 2 in 38 If weir, weir height inches 39 If weir, weir length inches 40 Drawdown time for the temporary pool (days) 3.2 41 Are the inlet(s) and outlet located in a manner that avoids short- cucuitin 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 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 SIo e of ve etated shelf H:V 6:1 48 Does the orifice drawdown from below the top surface of the ermanentpool. 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 turfgrass? Yes 53 Species of turf that will be used on the dam and embankment Fescue 54 Hasa plantinq plan been provided for the ve etated shelf? Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Wet Pond 1 10:33 AM 1/10/2023 WET POND 1 Draina a area number i 2 2 Minimum required treatmentvolume cu ft 44962 cf GENERAL MDC FROM 02H .1050 Is the SCM sized to treat the SW from all surfaces at build -out? Yes 3 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 en ines ed 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 dewaterin the SCM for maintenance? Pum ref! erred If applicable, will the SCM be cleaned out after construction? Yes 11 Does the maintenance access complywith General MDC 8 ? Yes 12 Does the drainage easement complywith General MDC 9 ? Yes 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC 10 Yes 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 devicespecific MDC? Yes 17 Was the SCM desi ned bv an NC licensedprofessional? Yes WET POND MDC FROM 02H .1053 18 Sizing method used 19 Has a stage/storage table been provided in the calculations? 20 Elevation of the excavated main pool depth (bottom of sediment0 removal fmsl 21 Elevation of the main pool bottom to of sediment removal fmsl0 22 Elevation of the bottom of the vegetated shelf fmsl 0 23 Elevation of the permanent pool fmsl 0 24 Elevation of the to of the vegetated shelf fmsl 0 F 25 Elevation of the temporary pool fmsl 0 26 Surface area of the main permanent pool (square feet 0 27 Volume of the main permanent pool cubic feet cf 28 Average depth of the main pool feet 29 Average depth euation used n 2 30 If usingequation 3 main pool perimeter feet 31 If usingequation 3, width of submerged veg. shelf feet 32 Volume of the foreba cubic feet 27341 cf 33 Is this 15-20 % of the volume in the main pool? Yes 34 Clean-outde th forforeba inches 12 in 35 Design volume of SCM cu ft 46706 cf 36 Is the outlet an orifice or a weir? Orifice 37 If orifice, orifice diameter inches 3 in 38 If weir, weir height inches 39 If weir, weir length inches 40 Drawdown time for the temporary pool (days) 3.78 41 Are the inlet(s) and outlet located in a manner that avoids short- cucuitin 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 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 SIo e of ve etated shelf H:V 6:1 48 Does the orifice drawdown from below the top surface of the ermanentpool. 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 turfgrass? Yes 53 Species of turf that will be used on the dam and embankment Fescue 54 Hasa plantinq plan been provided for the ve etated shelf? Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Wet Pond (2) 1 10:32 AM 1/10/2023