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HomeMy WebLinkAboutSW3230605_Supplement-EZ Form_20231011 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name Rogers Pond 2 Project Area(ac) 60.01 3 Coastal Wetland Area(ac) 0 4 Surface Water Area(ac) 1.56 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) 30 8 Will the vegetated setback remain vegetated? Yes 9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? Yes 10 Is streambank stabilization proposed on this project? Yes NUMBER AND TYPE OF SCMs: 11 Infiltration System 12 Bioretention Cell 13 Wet Pond 2 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: Blake H.Estridge,PE/Project Engineer 28 Organization: American Engineering Associates-Southeast,PA 29 Street address: 8008 Corporate Center Dr,Suite 110 30 City,State,Zip: Charlotte,NC 28226 31 Phone number(s): 704-375-2438 32 Email: bestridge@american-ea.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 11 \\,.4H Ci^ll///f// O OPI4 - 'a SEAL -- �23�� _ Signature of Designer • JO-U-2 --;>;17 '•11#0ii4E I 0 3 Seal Date 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 4 Type of SCM Wet Pond Wet Pond Sand Filter 5 Total drainage area(sq ft) 1450855 704149 500080 246626 6 Onsite drainage area(sq ft) 1402363 655657 500080 246626 7 Offsite drainage area(sq ft) 48492 48492 0 0 8 Total BUA in project(sq ft) 646972 sf 306882 sf _ 224851 sf 115239 sf New BUA on subdivided lots(subject to 9 permitting)(sq ft) 399584 sf 177288 sf 144820 sf 77476 sf New BUA not on subdivided lots(subject to 1 10 permitting)(sf) sf 11 Offsite BUA(sq ft) 48492 sf 48492 sf sf sf 12 Breakdown of new BUA not on subdivided lots: 0 -Parking(sq ft) sf -Sidewalk(sq ft) 51839 sf 21039 sf 20926 sf 9874 sf -Roof(sq ft) sf -Roadway(sq ft) 132904 sf 53799 sf 53705 sf 25400 sf -Future(sq ft) -Other,please specify in the comment box below(sq ft) 14153 sf 6264 sf 5400 sf 2489 sf New infiltrating permeable pavement on 13 subdivided lots(sq ft) New infiltrating permeable pavement not on 14 subdivided lots(sq ft) Existing BUA that will remain(not subject to 15 permitting)(sq ft) 16 Existing BUA that is already permitted(sq ft) 17 Existing BUA that will be removed(sq ft) 18 Percent BUA 44% 45% 47% 19 Design storm(inches) 1.0 in 1.0 in 1.0 in 20 Design volume of SCM(cu ft) 27226 cf 22345 cf 7364 cf 21 Calculation method for design volume Simple Method Simple Method Simple Method ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): Other BUA includes driveway areas inside of public road right-of-way WET POND 1 Drainage area number 1 2 I 2 Minimum required treatment volume(Cu ft) 25935 cf I 18941 cf GENERAL MDC FROM 02H.1050 3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes 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 Does the SCM have retaining walls,gabion walls or other 6 engineered side slopes? No No Are the inlets,outlets,and receiving stream protected from erosion 7(10-year storm)? Yes Yes 8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes design volume? 9 What is the method for dewatering the SCM for maintenance? Pump(preferred) Pump(preferred) 10 If applicable,will the SCM be cleaned out after construction? Yes Yes 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 WET POND MDC FROM 02H.1053 18 Sizing method used SA/DA SA/DA 19 Has a stage/storage table been provided in the calculations? Yes Yes 20 Elevation of the excavated main pool depth(bottom of sediment 626.50 588.50 removal)(fmsl) 21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 627.00 589.00 22 Elevation of the bottom of the vegetated shelf(fmsl) 632.00 594.00 23 Elevation of the permanent pool(fmsl) 632.50 594.50 24 Elevation of the top of the vegetated shelf(fmsl) 633.00 595.00 25 Elevation of the temporary pool(fmsl) 633.93 595.99 26 Surface area of the main permanent pool(square feet) 11901 9877 27 Volume of the main permanent pool(cubic feet) 47608 cf 34952 cf 28 Average depth of the main pool(feet) 4.00 ft 3.54 ft 29 Average depth equation used Equation 2 Equation 2 30 If using equation 3,main pool perimeter(feet) 31 If using equation 3,width of submerged veg.shelf(feet) 32 Volume of the forebay(cubic feet) 8687 cf 6450 cf 33 Is this 15-20%of the volume in the main pool? Yes Yes 34 Clean-out depth for forebay(inches) 66 in 66 in 35 Design volume of SCM(cu ft) 27226 cf 22345 cf 36 Is the outlet an orifice or a weir? Orifice Orifice 37 If orifice,orifice diameter(inches) 2.5 2 in 38 If weir,weir height(inches) 39 If weir,weir length(inches) 40 Drawdown time for the temporary pool(days) 2.2 2.4 Are the inlet(s)and outlet located in a manner that avoids short- 41 circuiting? Yes Yes 42 Are berms or baffles provided to improve the flow path? No No 43 Depth of forebay at entrance(inches) 72 in 72 in 44 Depth of forebay at exit(inches) 18 in 18 in 45 Does water flow out of the forebay in a non-erosive manner? Yes Yes 46 Width of the vegetated shelf(feet) 6 ft 6 ft 47 Slope of vegetated shelf(H:V) 6:1 6:1 Does the orifice drawdown from below the top surface of the 48 permanent pool? Yes Yes Does the pond minimize impacts to the receiving channel from the 1- 49 yr,24-hr storm? Yes Yes 50 Are fountains proposed?(If Y,please provide documentation that No No MDC(9)is met.) 51 Is a trash rack or other device provided to protect the outlet system? Yes i Yes 52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes 53 Species of turf that will be used on the dam and embankment Bermuda Sod Bermuda Sod 54 Has a planting plan been provided for the vegetated shelf? Yes i Yes ADDITIONAL INFORMATION Please use this space to provide any additional information about 55 the wet pond(s): Wet Pond 1 2:42 PM 10/11/2023 SAND FILTER 1 Drainage area number 3 2 Minimum required treatment volume(cu ft) 7264 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 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)? 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 16 Does the SCM follow the device specific MDC? Yes I 17 Was the SCM designed by an NC licensed professional? Yes SAND FILTER MDC FROM 02H.1056 18 SHWT elevation(fmsl) 581.5 I 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) 17060 cf 24 Will there be a permanent pool in the sediment chamber? No 25 Bottom of the sediment chamber(fmsl) 589.00 26 Area of the sediment chamber(square feet) 1494 sf 27 Physical depth of the sediment chamber(inches) 72 in 28 Ponding depth in the sediment chamber,above any permanent 72 in pool(inches) 29 Elevation of top of weir between chambers(fmsl) 590 Sand Chamber 30 Volume that can be retained in the sand chamber(cubic feet) 32258 cf 31 Bottom of the sand chamber(fmsl) 589.00 32 Area of the sand chamber(square feet) 700 sf 33 Physical depth of the sand chamber(inches) 72 in 34 Ponding depth in the sand chamber,above the sand surface 72 in (inches) 35 Elevation of the bypass device(fmsl) 592.5 36 Type of bypass device Riser with weir 37 Mechanism for distributing flow over the sand surface Riprap weir 38 Sand specification for sand chamber ASTM C-33 39 Depth above underdrain pipe(inches) 24 in Will the media be maintained to drain at least two inches per hour at 40 the sand surface? Yes 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 43 Please use this space to provide any additional information about the sand filter(s): Sand Filter 1 2:48 PM 10/11/2023