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Home My WebLink AboutSW3230803_Supplement-EZ Form_20230829 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name MCCOY FARM 2 Project Area(ac) 64.37 3 Coastal Wetland Area(ac) 0 4 Surface Water Area(ac) 2.4 5 Is this project High or Low Density? High 6 Does this project use an off-site SCM? No COMPLIANCE WITH 02H.1003(4) 7 Width of vegetated setbacks provided(feet) 0 8 Will the vegetated setback remain vegetated? N/A 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 14 Stormwater Wetland 15 Permeable Pavement 16 Sand Filter 2 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 1 23 StormFilter 24 Silva Cell 25 Bayfilter 26 Filterra FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: HY NGUYEN,PRINCIPLE&ENGINEER 28 Organization: DPR DESIGN 29 Street address: 919 BERRYHILL RD. 30 City,State,Zip: CHARLOTTE,NC 28208 31 Phone number(s): 704-340-0641 32 Email: JMCGIVERN@DPR.DESIGN 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 \\\\ CAR ��Ni •`moo ESS%p° 02 °Q- SEAL r" Signature of Designer 030523 - y' GINE,E �a 8/12/2022 Seal Date O7/O5/20�� DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so,number of drainage areas/SCMs 3 3 Does this project have low density areas? No 4 If so,number of low density drainage areas 0 Is all/part of this project subject to previous rule 5 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 3 SAND FILTER- SAND FILTER- DETENTION- 4 Type of SCM SAND FILTERS SCM 1A SCM#2 SCM 1B 5 Total drainage area(sq ft) 1,690,128 1093356 274428 322344 6 Onsite drainage area(sq ft) 1,657,022 1065650 269028 322344 7 Offsite drainage area(sq ft) 33,106 27706 5400 0 8 Total BUA in project(sq ft) 614898 sf 491976 sf 122176 sf sf New BUA on subdivided lots(subject to permitting) 9 (sq ft) 436192 sf 348321 sf 87871 sf sf New BUA not on subdivided lots(subject to 10 permitting)(sf) 145600 sf 115949 sf 29651 sf sf 11 Offsite BUA(sq ft) 33106 sf 27706 sf 5400 sf sf 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) sf sf sf sf -Sidewalk(sq ft) 31000 sf 24738 sf 6262 sf sf -Roof(sq ft) sf sf sf sf -Roadway(sq ft) 84600 sf 67511 sf 17089 sf sf -Future(sq ft) sf sf sf sf -Other,please specify in the comment box below(sq ft) 30000 sf 23700 sf 6300 sf New infiltrating permeable pavement on 13 subdivided lots(sq ft) sf sf sf sf New infiltrating permeable pavement not on 14 subdivided lots(sq ft) sf sf sf sf Existing BUA that will remain(not subject to 15 permitting)(sq ft) sf sf sf sf 16 Existing BUA that is already permitted(sq ft) sf sf sf sf 17 Existing BUA that will be removed(sq ft) sf sf sf sf 18 Percent BUA 36% 45% 45% 0% 19 Design storm(inches) 1.0 in 1.0 in 1.0 in .0 in 20 Design volume of SCM(cu ft) 38896 of 31092 cf 7804 cf cf 21 Calculation method for design volume SCS SCS SCS N/A ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): Other BUA=Cluster Mailbox and Entry Monuments. SCM 1 B is for detention only;Design Storm does not apply. Note:Future for HOA area is part of the OTHER BUA values. SAND FILTER 1 Drainage area number 1A 2 2 Minimum re uired treatment volume cu ft 31092 sf 7804 sf GENERAL MDC FROM 02H.1050 3 Is the SCM sized to treat the SW from all surfaces at build-out? Yco Yco 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 No No side slopes? 7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes (10-year storm)? 8 Is there an overflow or bypass for inflow volume in excess of the Yes No design volume? 9 What is the method for dewatering the SCM for maintenance? Other Other 10 If applicable,will the SCM be cleaned out after construction? No No 11 Does the maintenance access comply with General MDC(8)? _ Yes Yes _ 12 Does the drainage easement comply with General MDC(9)? Yes Yes If the SCM is on a single family lot,does(will?)the plat comply with 13 General MDC(10)? N/A N/A 14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes 15 Is there an O&M Plan that complies with General MDC(12)? Yes Yes 16 Does the SCM follow the device specific MDC? Yes Yes 17 Was the SCM designed by an NC licensed professional? Yes Yes SAND FILTER MDC FROM 02H.1056 I � 18'SHWT elevation(fmsl) 589 608 19 Type of sand filter(open or closed) _ Open Open 20 If closed,will the filter will be pre-cast or pour-in-place? 21 If closed,top of grate elevation(fmsl) _ 22 Is this sand filter designed to attenuate peak flows? No Yes Sediment Chamber 23 Volume that can be retained in the sediment chamber(cubic feet) 40300 cf 3675 cf 24 Will there be a permanent pool in the sediment chamber? No No 25 Bottom of the sediment chamber(fmsl) 595.00 612.00 26 Area of the sediment chamber(square feet) _ 18500 sf 3500 sf _ 27 Physical depth of the sediment chamber(inches) 24 in 18 in 28 Ponding depth in the sediment chamber,above any permanent pool 24 in 18 in (inches) _ 29 Elevation of top of weir between chambers(fmsl) 597 613.5 Sand Chamber 30 Volume that can be retained in the sand chamber(cubic feet) 19900 cf 16675 cf 31 Bottom of the sand chamber(fmsl) _ 595.00 611.50 32 Area of the sand chamber(square feet) 10000 sf 8200 sf 33 Physical depth of the sand chamber(inches) _ 24 in 24 in _ 34 Ponding depth in the sand chamber,above the sand surface 24 in 24 in (inches) 35 Elevation of the bypass device(fmsl) 597 614.5 36 Type of bypass device Outlet structure Outlet structure with weir. with weir. _ 37 Mechanism for distributing flow over the sand surface RIP-RAP BERM RIP-RAP BERM 38 Sand specification for sand chamber ASTM C-33 ASTM C-33 _ 39 Depth above underdrain pipe(inches) 3 in 3 in _ 40 Will the media be maintained to drain at least two inches per hour at Yes Yes the sand surface? 41 Is at least one clean-out pipe provided at the low point of each Yes Yes underdrain line? 42 Will clean-out pipes be capped? Yes Yes ADDITIONAL INFORMATION 43 Please use this space to provide any additional information about the sand filter(s): SCM 1A:The sand filter provides WQ. Detention is provided by SCM 1B, the"water feature"descibed in the Narrative in the calculation binder. Dewater:these are sand filters;there should be no need for dewatering;if there is a complete failure of the sand media then any excess water would have to be pumped out;refer to DEWATERING DETAIL on CDs,C3 series. Sand Filter 1 11:33 AM 7/20/2023 DRY POND 1 Drainage area number 1 B 2 Minimum required treatment volume(cu ft) 150439 cf GENERAL MDC FROM 02H.1050 3 Is the SCM sized to treat the SW from all surfaces at build-out? No 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 No side slopes? 7 Are the inlets,outlets,and receiving stream protected from erosion Yes (10-year storm)? 8 Is there an overflow or bypass for inflow volume in excess of the Yes design volume? 9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice 10 If applicable,will the SCM be cleaned out after construction? No 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 N/A General MDC(10)? 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 DRY POND MDC FROM 02H.1062 18ISHWT elevation(fmsl) 589 19 Elevation of the bottom of the dry pond(fmsl) 589 20 Distance from bottom to SHWT(feet) ft 21 Elevation of the temporary pool during the design storm(feet) 590 ft 22 Ponding depth of the design storm(feet) 2 ft 23 Will the dry pond be uniformly graded to flow toward the outlet? No 24 Is a low flow channel being provided? No 25 Are the inlet(s)and outlet located in a manner that avoids short- Yes circuiting? 26 Will berms or baffles be provided to increase the flow path? No 27 What method of pretreatment will be provided? SAND FILTER 28 Design volume of SCM(cu ft) _ 342500 29 Diameter of drawdown orifice(in) 7"x 6" 30 Drawdown time for the temporary pool(hours) 110 31 Does the pond minimize impacts to the receiving channel from the 1- Yes yr,24-hr storm? 32 Is there a small permanent pool near the orifice to prevent clogging? No 33 Will the outlet be designed to prevent clogging? Yes 34 Are the dam and embankment planted in non-clumping turf grass? Yes 35 Species of turf that will be used on the dam and embankment See planting schedule 36 Will trees and shrubs be prevented from growing on the dam and Yes embankment? ADDITIONAL INFORMATION Please use this space to provide any additional information about the 37 dry pond(s): 1 B is a"water feature"used for detention only. It is an existing pond which will have a outlet structure to control the out flows. Please refer to the design,Sheets C2-5 and C2-6. If dewatering is necessary,there is a dewatering oriface. If this fails,then refer to DEWATERING DETAIL on the CDs,C3 series. Dry Pond 1 11:33 AM 7/20/2023