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Home My WebLink AboutSW3220302_Supplement-EZ Form_20221212SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION roject Name RP roject Area acoastal Wetland Area urface Water Area (a Denver Defense 4.494 N/A N/A 5 1 Is this project High or Low Density? High 6 1 Does this protect use an off -site SCM? No COMPLIANCE WITH 02H .1003(4) 7 Width of ve etated setbacks provided feet 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 ? I N/A 10 1 Is streambank stabilization proposed on this project? I No NUMBER AND TYPE OF SCMs: 11 Infiltration S stem 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 Storm Filter 24 Silva Cell 25 jBayfilter 26 IFilterra FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Jay Henson, Principal 28 Or anization: HensonFole 29 Street address: 121 Gilead Rd. 30 City, State, Zip: Huntersvill, NC, 28078 31 JPhone numbers : 704-875-1615 32 Email: jay@hensonfoley.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. \0\1111III///// � .. CAR ��i oDS • S •� / / w � / V 1� Vo7'��_ SigIt ure of besigner 10/20/2022 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 AREA INFORMATION Entire Site 1 4 Type of SCM N/A sand filter 5 Total draina a area s ft 195759 119449 6 Onsite draina e area s ft 195759 117333 7 Offsite draina a area s ft 0 2116 8 Total BUA in project (sq ft) 121358 sf 72929 sf 9permitting) New BUA on subdivided lots (subject to s ft N/A N/A 10permitting) New BUA not on subdivided lots (subject to sf 87385 sf 53641 sf 11 JOffsite BUA (sq ft N/A 2116 sf 12 Breakdown of new BUA not on subdivided lots: Parking (sq ft 25415 sf 14234 sf Sidewalk (sq ft 338 sf 338 sf Roof (sq ft 5203 sf Roadway s ft Future (sq ft 56429 sf 39069 sf Other, please specify in the comment box below (sq ft 13 New infiltrating permeable pavement on subdivided lots (sq ft N/A N/A 14 New infiltrating permeable pavement not on subdivided lots (sq ft N/A N/A 15 Existing BUA that will remain (not subject to ermitting) (sq ft 33973 sf 17172 sf 16 Existing BUA that is already permitted (sq ft 17 Existing BUA that will be removed (sq ft 16572 sf 2900 sf 18 Percent BUA 49% 61 % 19 Design storm inches 1.0 in 1.0 in 20 Design volume of SCM cu ft n/a 4611 cf 21 lCalculation method for design volume I n/a Simple RV method ADDITIONAL INFORMATION 22 Please use this space to provide any additional information about the drainage area(s): With site conditions it was found impossible to get all new BUA to BMP. As a comprimise, some existing BUA would be taken to bmp and that the final BUA number to BMP was greater than proposed BUA. SAND FILTER ERAL MDC IMM 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- 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 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 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 SAND FILTER MDC FROM 02H .1056 18 SHWT elevation (fmsl) 831.5 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 I Sediment Chamber 23 Volume that can be retained in the sediment chamber (cubic feet) 2305 cf 24 Will there be a permanent pool in the sediment chamber? No 25 Bottom of the sediment chamber (fmsl) 842.00 26 Area of the sediment chamber (square feet) 500 sf 27 Physical depth of the sediment chamber (inches) 18 in 28 Ponding depth in the sediment chamber, above any permanent pool (inches) 18 in 29 Elevation of top of weir between chambers (fmsl) 843.5 I Sand Chamber 30 Volume that can be retained in the sand chamber (cubic feet) 2305 cf 31 Bottom of the sand chamber (fmsl) 841.50 32 Area of the sand chamber (square feet) 525 sf 33 Physical depth of the sand chamber (inches) 24 in 34 Ponding depth in the sand chamber, above the sand surface (inches) 24 in 351 Elevation of the bypass device (fmsl) 843.5 36 Type of bypass device 6" ORIFICE 37 Mechanism for distributing flow over the sand surface RIP -RAP BERM 38 Sand specification for sand chamber ASTM C33 39 Depth above underdrain pipe (inches) 18 in 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 ADDITIONAL INFORMATION 43 Please use this space to provide any additional information about the sand filter(s): Sand Filter 1 4:01 PM 10/13/2022