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Home My WebLink AboutSW3210301_Supplement-EZ Form_20210309SUPPLEMENT-EZ COVER PAGE FCJRMS I..CJADFD PROJECT INFORMATION�� 1 ..................................................................................................................................................................................................................................................................................................................................................................................................................................................... Project Name Cresswind - Phase 2 2 Project Area ac 44.1 3 Coastal Wetland Area (ac) 0.. 4 Surface Water Area ac 0.5 5 Is this project High or Low Densit ? High 6 Does this project use an off -site SCM? No COMPLIANCE WITH 02H .1003(4�.......................................................................................... 7 Width of ve etated setbacksprovided feet 30 8 Will the vegetated setback remain vegetated? Yes 9 ( )(.. Is BUA other that as listed m 1003 4 c d out of the setbacks Yes 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCNIs. 11 Infiltration System 0 12 ..................................................................................................................................................................................................................................................................................................................................................................................................................................................... B ioretention Cell 0 13 Wet Pond.... i... 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 22 Dry Pond.... 0.. 23 StormFilter 0 24 Silva CelL........ 0.. 25 Bayfilter 0 26 Filterra 0 E RM51.DIFD DESIGNER CERTIFICATION 27 Name and Title: Matthew S. Kiker 28 Organization: Thomas & Hutton 29 Street address: 1020 Euclid Avenue 30 City, State, Zip: Charlotte, NC 28203„ 31 Phone number(s): 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. Designer CA i AL - 049480 - �� •••FN0INEER•••��,�.�. `Se`al r - Z40C:'. 4 Y Signature of Designer Date DRAINAGE AREAS ............................................................................................................................................................................................................................................................................ 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 1 Is all/part of this project subject to previous rule 3 versions? No ci..ici< ro i..ra D21 DRAINAGE�AREAINFORMATION�...... ...... ...... ...... ...... ................................................................................1................. 4 Type of SCM N/A Wet Pond 5 Total BUA in project (sq ft) 1 319710 sf 1319710 sf New BUA on subdivided lots (subject to 6 permitting) (sq ft) 860000 sf 860000 sf New BUA outside of subdivided lots (subject to 7 ermitting) (sD 459710 sf 459710 sf 8 Offsite -total area (sq ft) sf sf 9 Offsite BUA (sq ft) sf sf 10 Breakdown of new BUA outside subdivided lots: Parking (sq ft) sf sf Sidewalk (sq ft).... 26890 sf 26890 sf Roof (sq ft) sf sf Roadway (sq ft) 93466 sf 93466 sf Future (sq ft) 244354 sf 244354 sf Other, please specify in the comment box below sq ft sf sf New infiltrating permeable pavement on 11 subdivided lots (sq ft) sf sf New infiltrating permeable pavement outside of 12 subdivided lots s ft sf sf Exisitng BUA that will remain (not subject to 13 permitting) (sq ft) sf sf 14 Existing BUA that is already„permitted „ (sq ft) sf sf 15 Existing BUA that will be removed (sq ft) sf sf 16 Percent BUA 67% 67% 17 Design storm (inches) 1 in 18 Design volume of SCM (cu ft) 107158 cf 19 Calculation method for design volume Simple ADDITIONAL UFO Please use this space to provide any additional information about the area(s) The future area is intended to account for a portion of a future phase to be managed with this Phase 2 pond. WET POND 1 Drainage area number 1 2 Design volume of SCM (cu ft) 107158 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 Does the SCM have retaining walls, gabion walls or other 6 engineered side slopes? No Are the inlets, outlets, and receiving stream protected from erosion 7 (10-year storm)? Yes is there an overflow or bypass for inflow volume in excess of the 8 design volume? Yes 9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice .......................................................................................................................................................................................................................................................................................................................... 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 if the SCM is on a single family lot, does (will?) the plat comply with 13 .......................................................................................................................................................................................................................................................................................................................... General MDC (10)? No 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 designed by an NC licensed professional? Yes WET POND MDC FROM 02H .1053 18 Method used SA/DA .......................................................................................................................................................................................................................................................................................................................... 19 Has a stage/storage table been provided in the calculations? Yes Elevation of the excavated main pool depth (bottom of sediment 20 removal) (fmsl) 560:50 21 Elevation of the main pool bottom -(top of sediment removal) (fmsl) 561.00 Elevation of the temporary pool (fmsl) 565:51 ...................................................................................................................................................................................................................................................................................... Surface area of the main permanent pool (square feet) 38866 Volume ..of.the..main..pe permanent pool feet) p ( Average depth of the.. main.. poolfeet..( .................................................................................................................................2.89..ft...... 9 ) ..eused.................................................................................................................................................Equation..3 Avera(1 q q....e..pdet„quation 33 Is this 15-20% of the volume in the main pool? Yes ................................................................................................................................................................................................................................................................................................... 34 Clean -out depth for forebay (inches) 48 it .................................................................................................................................................................................................................................................................................................. 35 Design volume of SCM (cu ft) 10715E 36 Is the outlet an orifice or a weir. Orific ................................................................................................................................................................................................................................................................................................... 37 If orifice, orifice diameter (inches) 5. in ................................................................................................................................................................................................................................................................................................... 38 If weir, weir height (inches) ................................................................................................................................................................................................................................................................................................... 39 If weir, weir length (inches) ................................................................................................................................................................................................................................................................................................... 40 Drawdown time for the temporary pool (days) 3 ................................................................................................................................................................................................................................................................................................... Are the inlet(s) and outlet located in a manner that avoids short- 41 circuiting? Yes 42 Are berms or baffles provided to improve the flow path? No ................................................................................................................................................................................................................................................................................................... 43 Depth of forebay at entrance (inches) 60 it 44 Depth of forebay at exit (inches) 54 it 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 ................................................................................................................................................................................................................................................................................................... Does the orifice drawdown from below the top surface of the 48 permanent pool? Yes ................................................................................................................................................................................................................................................................................................... Does the pond minimize impacts to the receiving channel from the 1- 49 yr, 24-hr storm? Yes ................................................................................................................................................................................................................................................................................................... Are fountains proposed? (If Y, please provide documentation that 50 ................................................................................................................................................................................................................................................................................................... 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 .............'S3'.§pecies..of. turf .that.will..be..used..o n.the..dam..and..embankment Bermu 54 Has a planting plan been provided for the vegetated shelf. Yes ADDITIONAL�INFORMATION�.... ...... ""...... ...... ...... ...... ...... ...... ...... ....�� Flease use this s aoe to rovde an addtrona� nformatonabout p p Y 11 55 the wet pond(s): Wet Pond 1 5:10 PM 2/22/2021