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Home My WebLink AboutSW6240403_Supplement-EZ Form_20240425 SUPPLEMENT-EZ COVER PAGE IFORMS LOADED PROJECT INFORMATION _ 1 Project Name Station Pointe Phase 2 ,-- - 2 Project Area(ac) 31.45 _ ._ - -- 3 Coastal Wetland Area(ac) - — 0 4 Surface Water Area(ac) _ 2.94 5 Is>this project High or Low Density? I _ High 6 Does this project use an off-site SCM? No COMPLIANCE WITH 02H.1003(4) 7 Width of vegetated setbacksprovided(feet) WA 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 I� 13 Wet Pond 1 1 — -- — 14 Stormwater Wetland — — — —15 Permeable Pavement - 16 Sand Filter _ —17 Rainwater Harvesting(RWH) - 18 IGreen Roof _-- — 19 Level Spreader-Filter Strip(LS-FS) 20 Disconnected Impervious Surface(DIS) - 21 Treatment Swale 22 Dry Pond -- --23 IStormFilter 24 iSilva Cell — -- —. 25 'Bayfilter26 j Filterra FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: _ Kirby R.Bell,Jr.Senior Project Engineer _ 28 Organization: r` _ Bass,Nixon and Kennedy,Inc 29 Street address: L 6310 Chapel Hill Road;Ste.250 30 City,State,Zip: - Raleigh.NC 27607 — 31 Phone number(s): - __ _ 919-851-4422 32 Email: robbie.bell@bnkinc.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 ,tto�puaaaesannrrr ice �9<• Sig igner�' i SEAL1 _ 14023 .......al m ala.„„ 3/1#4- Seat Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so.number of drainage areas/SCMs 1 ` 1 __ 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 4 Type of SCM Wet pond 5 Total drainage area(sq ft) 1,369,962 900,385 6 Onsite drainage area(sq ft) 1,369,962 900,385 7 Offsite drainage area(sq ft) 0 — 0 8 Total BUA in project(sq ft) 678239 sf 632492 sf New BUA on subdivided lots(subject to permitting) 9 (sq ft) 504000 sf 632492 sf _ New BUA not on subdivided lots(subject to 10 permitting)(sf), sf sf 11 Offsite BUA(sq ft) sf sf 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) sf _ sf i -Sidewalk(sq ft) 42688 sf _ 42688 sf -Roof(sq ft) _ sf 458252 sf -Roadway(sq ft) 131551 sf — 131551 sf -Future(§s ft) sf sf -Other,please specify in the comment box below(sq ft) sf _ 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) sf _sf 16 Existing BUA that is already permitted(sq ft) sf sf 17 Existing BUA that will be removed(sq ft) sf _ sf 18 Percent BUA 50% 70% 19 Design storm(inches) 1.0 in 1.0 in 20 Design volume of SCM(cu ft) N/A 51189 cf 21 Calculation method for design volume N/A SA/DA ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): WET POND 1'Drainage area number I 1 I 2 Minimum required treatment volume(Cu ft) ) 51189 cf GENERA!MDC FROM 02H 3050 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 7Yes (10-year storm)? Is there an overflow or bypass for inflow volume in excess of the Yes 8 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 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? WET P'OfID MDC FROM 02H.1053 18 Sizing method used SA/DA_ 19 Has a stage/storage table been provided in the calculations? Yes 20 Elevation of the excavated main pool depth(bottom of sediment 263.00 removal)(fmsl) 21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 263.50 22 Elevation of the bottom of the vegetated shelf(fmsl) 268.00 23 Elevation of the permanent pool(fmsl) 268.50 24 Elevation of the top of the vegetated shelf(fmsl) 269.00 - 25 Elevation of the temporary pool(fmsl) 271.33 26 Surface area of the main permanent pool(square feet) 23222 _ 27 Volume of the main permanent pool(cubic feet) 66007 cf 28 Average depth of the main pool(feet) 4.00 ft 29 Average depth equation used Equation 3 _ 30 If using equation 3,main pool perimeter(feet) ! 742.0 ft 31 If using equation 3,width of submersed veg.shelf(feet) I 3.0 ft 32 Volume of the forebay(cubic feet) 11730 cf_ 33 Is this 15-20%of the volume in the main pool? Yes 34 Clean-out depth for forebay(inches) 6 in 35 Design volume of SCM(cu ft) 199377 cf 36 Is the outlet an orifice or a weir? ; Orifice 37 If orifice,orifice diameter(inches) 3 in _ 38 If weir,weir height(inches) - 39 If weir,weir length(Inches) 40 Drawdown time for the temporary pool(days) 4.5 41 Are the inlet(s)and outlet located in a manner that avoids short- Yes circuiting? 42 Are berms or baffles provided to improve the flow path? Yes 43 Depth of forebay at entrance(inches) 54 in _ 44 Depth of forebay at exit(inches) 48 in 45 Does water flow out of the forebay in a non-erosive manner? 1 Yes 46 Width of the vegetated shelf(feet) _ 6 ft 47 Slope of vegetated shelf(H:V) 6:1 48 Does the orifice drawdown from below the top surface of the Yes permanent pool? 49 Does the pond minimize impacts to the receiving channel from the 1- , Yes yr,24-hr storm? _ Are fountains proposed?(If Y,please provide documentation that 50 No MDC(9)is met.) I _ 51 Is a trash rack or other device provided to protect the outlet system? Yes 52 Are the dam and embankment planted in non-clumping turf grass? I Yes 53 Species of turf that will be used on the dam and embankment 54 Has a planting plan been provided for the vegetated shelf? I Yes ADDITIONAL INFORMATION 55'Please use this space to provide any additional information about the wet pond(s): Wet Pond 1 3:05 PM 3/19/2024