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Home My WebLink AboutSW1240301_Supplement-EZ Form_20240923 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name Marketplace at Mills River 2 Project Area(ac) 15.73 3 Coastal Wetland Area(ac) 0 -_ 4 Surface Water Area(ac) 0 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)_ s 30 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 1 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 Filterra FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Jennifer Losurdo,PE(Managing Partner) 28 Organization: Genesis Engineering Collaborative 29 Street address: _ 3360 Martin Farm Road,Suite 200 _ 30 City,State,Zip: Suwanee,GA 30024 31 Phone number(s): 470.375.2001 32 Email: jennifer.losurdo@genesiseng.net Certification Statement: I certify,under penally 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 \`\ ICf Al��i\\\``.•114 i/.„ Q`�0F ES.s017. 4 / SEAL 49384 = I�_'�`�'� Signs t 'of Designer .yti, it i INEER pj,�' ((‘I? N. I OS� '1111111111111tt'' •r 1 hi I‘btal+ Seal Dale DRAINAGE AREAS 1 Is this a high density project? Yes _- 2 If so,number of drainage areas/SCMs 1 3 Does this project have low density areas? No 4 If so,number of low density drainage areas 0 Is allpart of this project subject to previous rule 5 versions? No FORMS LOADED 'DRAINAGE AREA INFORMATION Entire Site 4 Type of SCM Sand Filter Sand Filter 5 Total drainage area(sq ft) 698673 622479 6 Onsite drainage area(sq ft) 698673 603003 7 Offsite drainage area(sq ft) 0 19476 8 Total BUA in project(sq ft) 499182 sf 473705 sf New BUA on subdivided lots(subject to 9 permitting)(sq ft) 160345 sf 160345 sf New BUA not on subdivided lots(subject to 10 permitting)(sf) 338837 sf 313723 sf 11 Offsite BUA(sq ft) sf 4598 sf 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) 64039 sf 64039 sf -Sidewalk(sq ft) 13189 sf 13189 sf -Roof(sq ft) 61125 sf 61125 sf -Roadway(sq ft) 20425 sf 19888 sf -Future(sq ft) sf sf -Other,please specify in the comment box below(sq ft) 174365 sf 150884 sf New infiltrating permeable pavement on 13 subdivided lots(sq ft) sf sf New infiltrating permeable pavement not on 14 subdivided lots(sq ft) sf sf Existing BUA that will remain(not subject to 15 permitting)(sq ft) 5694 sf 2429 sf 16 Existing BUA that is already permitted(sq ft) sf sf 17 Existing BUA that will be removed(sq ft) 41536 sf 38583 sf 18 Percent BUA 71% 77% 19 Design storm(inches) 1.0 in 20 Design volume of SCM(cu ft) 28709 cf 21 Calculation method for design volume SCS ADDITIONAL INFORMATION v__,.... (Please use this space to provide any additional information about the 22 drainage area(s): Subdivided lots include Lots 2,3,4 and 5.Line 12 includes all impervious area not on Lots 2-5.Other BUA:includes private driveways,drive aisles, concrete pads,truck well,and other miscellanous impervious areas. Roadway BUA:includes only Vance Hill Drive asphalt,curb,and gutter. Parking BUA: only parking space impervious area. SAND FILTER 1 Drainage area number _ 1 2 Minimum required treatment volume(cu ft) 26105 sf GENERAL MDC FROM 0211.1050 3 Is the SCM sized to treat the SW from all surfaces at build-out? _ Yes 4f 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 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? Pump(preferred) 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)? 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 SAND FILTER MDC FROM 02H.1056 18 SHWT elevation(fmsl) _ 2088 19 Type of sand filter(open or closed) 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? Yes Sediment Chamber 23 Volume that can be retained in the sediment chamber(cubic feet) 12021 cf 24 Will there be a permanent pool in the sediment chamber? No 25 Bottom of the sediment chamber(fmsl) 2097.00 26 Area of the sediment chamber(square feet) 2593 sf 27 Physical depth of the sediment chamber(inches) 39 in 28 Ponding depth in the sediment chamber,above any permanent 39 in pool(inches) 29 Elevation of top of weir between chambers(fmsl) 2101 Sand Chamber 30 Volume that can be retained in the sand chamber(cubic feet) 15578 cf 31 Bottom of the sand chamber(fmsl) 2094.50 32 Area of the sand chamber(square feet) 3070 sf 33 Physical depth of the sand chamber(inches) 75 in 34 Ponding depth in the sand chamber,above the sand surface 45 in (inches) 35 Elevation of the bypass device(fmsl) 2100.25 36 Type of bypass device orifce 37 Mechanism for distributing flow over the sand surface pipe network 38 Sand specification for sand chamber ASTM C-33 39 Depth above underdrain pipe(inches) 12 in 40 Will the media be maintained to drain at least two inches per hour at Yes the sand surface? 41 Is at least one clean-out pipe provided at the low point of each Yes underdrain line? 42 Will clean-out pipes be capped? _ Yes ADDITIONAL INFORMATION Please use this space to provide any additional information about 43 the sand filter(s): Sand Filter 3 10:53 AM 9/20/2024