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Home My WebLink AboutSW3210301_Supplement-EZ Form_20210511SUPPLEMENT-EZ COVER PAGE FORMS LOADED (PROJECT INFORMATION 1 jProject Name 2 1 Project Area ac 3 lCoastal Wetland Area 4 Surface Water Area ac 5 Is this project High or Low Density? 6 Does this protect use an off -site SCM? Cresswind - Phase 3 63 0.56 High No COMPLIANCE WITH 02H .1003(4) 7 Width of vegetated setbacks rovided 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 ? Yes 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration S stem 0 12 Bioretention Cell 0 13 Wet Pond 1 14 Stormwater Wetland 0 15 Permeable Pavement 0 16 Sand Filter 0 17 Rainwater 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 Silva Cell 0 25 lBayfilter 0 26 1 Filterra 0 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Matthew S. Kiker Tho Or anization: Thomas & Hutton 29 Street address: 1020 Euclid Avenue 30 City, State, Zip: Charlotte, NC 28203 31 Phone numbers : 980-201-5507 32 Email: kiker.m@tandh.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. H C A R •�''�4 �•-.�p�LSSlgNq . q USEAL 04948O ' • .......... • .•� .•••.......• [i�9 THOMAS E HUTTON ENGINEERING No F-OB71 ' Signature of Designer Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of draina a areas/SCMs 1 3 Does this roiect have low densit areas? No 4 F5 If so, number of low densitydrainage areas 0 Is all/part of this project subject to previous rule versions? No FORMS LOADED Entire Site 1 4 T pe of SCM N/A Wet Pond 5 Total drainage area (sq ft 865355 6 Onsite drainage area (sq ft 865355 7 Offsite drainage area (sq ft 0 8 Total BUA in project (sq ft 589657 sf 9permitting) New BUA on subdivided lots (subject to s ft 589657 sf 10permitting) New BUA not on subdivided lots (subject to s - 11 Offsite BUA (sq ft - 12 1 Breakdown of new BUA not on subdivided lots: Parking (sq ft 91250 sf Sidewalk (sq ft 31114 sf Roof (sq ft 365000 sf Roadway s ft 89979 sf 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 15permitting) Existing BUA that will remain (not subject to s ft 16 Existina BUA that is already permitted (sq ft 17 Existing BUA that will be removed (sq ft 18 Percent BUA 68 0 19 Design storm inches 1 in 20 Design volume of SCM cu ft 47842 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 area number ERAL 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)? :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? Drawdown Orifice 10 If a Iicable, 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 ? No 14 Is there an O&M Agreement that complies with General MDC (11)? Yes 151 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 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 564.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 564.50 221 Elevation of the bottom of the vegetated shelf (fmsl) 567.50 23 Elevation of the permanent pool (fmsl) 568.00 24 Elevation of the top of the vegetated shelf (fmsl) 568.50 25 Elevation of the temporary pool (fmsl) 568.00 26 Surface area of the main permanent pool (square feet) 18273 27 Volume of the main permanent pool (cubic feet) 54465 cf 28 Average depth of the main pool (feet) 2.95 ft 29 Average depth equation used Equation 3 30 If using equation 3, main pool perimeter (feet) 660.0 ft 31 If using equation 3, width of submerged veg. shelf (feet) 3.0 ft 32 Volume of the forebay (cubic feet) 9305 cf 33 Is this 15-20% of the volume in the main pool? Yes 34 Clean -out depth for forebay (inches) 48 in 351 Design volume of SCM (cu ft) 47842 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 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? No 43 Depth of forebay at entrance (inches) 66 in 44 Depth of forebay at exit (inches) 60 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 ermanent pooI? 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 plantinq 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 1 11:49 AM 4/2/2021