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Home My WebLink AboutSW3201002_500 - send original - SuppEZ - sealed_20210106SUPPLEMENT-EZ COVER PAGE FORMS LOADED INFORMATION EL 1 Project Name 7-11 Long Ferry Road 2 Project Area (ac) 4.1 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) N/A 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 MBER AND TYPE 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 SIGNER CERTIFICATION 27 Name and Title: Jonathan Woodard, P.E., Project Engineer 28 Organization: McAdams 29 Street address: 3430 Toringdon Way, Suite 110 30 City, State, Zip: Charlotte, North Carolina 28277 31 Phone number(s): 704.527.0800 32 Email: jwoodard@mcadamsco.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 `,w i lllrlrl'1'' �.�` CAR p 'vvy '�. SEAL 0491 8 - '.•tip f NEF:: oQ-`; .N' s' wp0 \�. ��11rlu�IJ�I�, &111ure of Designer J412=i Date 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 5 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 4 Type of SCM Sand Filter 5 Total drainage area (sq ft) 176453 146,033 6 Onsite drainage area (sq ft 176453 140,637 7 Offsite drainage area (sq ft) 0 5,396 8 Total BUA in project (sq ft) 121036 sf 122430 sf 9 New BUA on subdivided lots (subject to permitting) (sq ft) 121036 sf 10 New BUA not on subdivided lots (subject to permitting) (so 121036 sf 122430 sf 11 Offsite BUA (sq ft) 12 Breakdown of new BUA not on subdivided lots: Parking (sq ft) 112204 sf 108202 sf Sidewalk (sq ft) 4030 sf 4030 sf Roof (sq ft) 4802 sf 4802 sf Roadway (sq ft) 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 Isubdivided 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) 11469 sf 11469 sf 18 Percent BUA 69% 84% 19 Design storm (inches) na V 20 Design volume of SCM (cu ft) na 6838 cf 21 Calculation method for design volume nA Simple Method ADDITIONAL INFORMATION 122 Please use this space to provide any additional information about the drainage area(s): SAND FILTER 1 Drainage area number 1 to SCM 2 Minimum required treatment volume cu ft 6838 sf 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 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-year 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 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 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC (10)? N/A 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 161 Does the SCM follow the device specific MDC? Yes 17 Was the SCM designed by an NC licensedprofessional? I Yes SAND FILTER MDC FROM 02H .1056 18 SHWT elevation (fmsl) -15 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? No Sediment Chamber 23 Volume that can be retained in the sediment chamber (cubic feet) 4236 cf 24 Will there be a permanent pool in the sediment chamber? No 25 Bottom of the sediment chamber fmsl 703.00 26 Area of the sediment chamber (square feet) 1899 sf 27 Physical depth of the sediment chamber inches 24 in 28 Ponding depth in the sediment chamber, above any permanent pool inches 15 in 291 Elevation of top of weir between chambers (fmsl) 705 Sand Chamber 30 Volume that can be retained in the sand chamber cubic feet 4447 cf 31 Bottom of the sand chamber (fmsl) 703.00 32 Area of the sand chamber (square feet) 1831 sf 33 Physical depth of the sand chamber (inches) 24 in 34 Ponding depth in the sand chamber, above the sand surface inches 15 in 351 Elevation of the bypass device (fmsl) 705 36 Type of bypass device Riser 37 Mechanism for distributing flow over the sand surface Diffusion over earthen weir 38 Sand specification for sand chamber See additional info 39 Depth above underdrain pipe (inches) 15 in minimum 40 Will the media be maintained to drain at least two inches per hour at the sand surface? Yes 41 Is at least one clean -out pipe provided at the low point of each underdrain line? Yes 42 Will clean -out pipes be capped? Yes TION 43 Please use this space to provide any additional information about the sand filter(s): Sand Specification: Clean AASHTO-M-6 or ASTM-C-33 Concrete Sand Sand Filter 3 5:49 PM 1/5/2021