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Home My WebLink AboutSW5231001_Supplement-EZ Form_20240408 SUPPLEMENT-EZ COVER PAGE PROJECT INFORMATION 1 Project Name Economy 3 Expansion 2 Project Area(ac) _ 144.4 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) 50+ 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)? 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 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 SUBMERGED GRAVEL WETLANDS 7 DESIGNER CERTIFICATION 27 Name and Title: Timothy S.Kennerly,PE 28 Organization: Kennerly Engineering&Design,Inc. 29 Street address: 12133 N NC HWY 150,Ste.F 30 City,State,Zip: Winston-Salem,NC 27127 31 Phone number(s): (336)775-2118 32 Email: timothy.kennerly@kennerlyengineering.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 \ ��\1111III1 of ESS%p' % '.Q % < ' Signature of Designer SEAL - - 29317 :> p'•F./yG I NEC•• \<4 //,/ s -‘ • 4/05 ///1111I11111�� Date / DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so,number of drainage areas/SCMs 7 3 Does this project have low density areas? No 4 If so,number of low density drainage areas Is all/part of this project subject to previous rule 5 versions? No DRAINAGE AREA INFORMATION I Entire Site 1 2 3 4 5 6 7 4 'Type of SCM SGW SGW SGW SGW SGW SGW SGW 5 Total drainage area(sq ft) 6,290,511 602,870 649,915 314,068 691,733 620,730 358,934 794,851 6 Onsite drainage area(sq ft) 6,290,511 602,870 649,915 314,068 691,733 620,730 358,934 794,851 7 Offsite drainage area(sq ft) 0 0 0 0 0 0 0 0 8 Total BUA in project(sq ft) 4860758 sf 508719 sf 571590 sf 274439 sf 578930 sf 539140 sf 294915 sf 706201 sf New BUA on subdivided lots(subject to 9 permitting)(sq ft) New BUA not on subdivided lots(subject to 10 permitting)(sf) 3308058 sf 508719 sf 571590 sf 274439 sf 578930 sf 394085 sf 294915 sf 706201 sf 11 Offsite BUA(sq ft) 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) 3308058 sf _ 508719 sf 550598 sf _ 264716 sf 641203 sf 394085 sf 283576 sf 665161 sf -Sidewalk(sq ft) -Roof(sq ft) -Roadway(sq ft) -Future(sq ft) -Other,please specify in the comment box below(sq ft) 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) 1552700 sf 145055 sf 16 Existing BUA that is already permitted(sq ft) 17 Existing BUA that will be removed(sq ft) 18 Percent BUA 70% 84% 88% _ 87% 84% 87% 82% 89% 19 Design storm(inches)(req.by rule) 1.0 in 1.0 in _ 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in 20 Design volume of SCM(cu ft) 41664 cf 53310 cf 34600 cf 56116 cf 51447 cf 38004 cf 61749 cf 21 Calculation method for design volume Total Storage Total Storage Total Storage Total Storage Total Storage Total Storage Total Storage ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): SUBMERGED GRAVEL WETLANDS 1 Drainage area number 1 2 3 4 5 6 7 2 Minimum required treatment volume(cu ft) 40671 45571 21891 46301 43032 23610 56270 GENERAL MDC FROM 02H.1050 3 Is the SCM sized to treat the SW from all-surfaces at build-out? Yes Yes Yes Yes Yes Yes Yes 4 Is the SCM located away from contaminated soils? Yes Yes Yes Yes Yes Yes Yes 5 What are the side slopes of the SCM(H:V)? 3:1 3:1 3:1 3:1 3:1 3:1 3:1 6 Does the SCM have retaining walls,gabion walls or other engineered side slopes? No No No No No No No 7 Are the inlets,outlets,and receiving stream protected from erosion(10-year storm)? Yes Yes Yes Yes Yes Yes Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes Yes Yes Yes Yes Yes Yes Cleanout in Cleanout in Cleanout in Cleanout in Cleanout in Cleanout in Cleanout in 9 control control control control control control control What is the method for dewatering the SCM for maintenance? structure structure structure structure structure structure structure 10 If applicable,will the SCM be cleaned out after construction? Yes Yes Yes Yes Yes Yes Yes 11 Does the maintenance access comply with General MDC(8)? Yes Yes Yes Yes Yes Yes Yes 12 Does the drainage easement comply with General MDC(9)? N/A N/A N/A N/A N/A N/A N/A 13 If the SCM is on a single family lot,does(will?)the plat comply with General MDC(10)? N/A N/A N/A N/A N/A N/A N/A 14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes Yes Yes Yes Yes Yes 15 Is there an O&M Plan that complies with General MDC(12)? Yes Yes Yes Yes Yes Yes Yes 16 Does the SCM follow the device specific MDC? N/A N/A N/A N/A N/A N/A N/A 17 Was the SCM designed by an NC licensed professional? Yes Yes Yes Yes Yes Yes Yes Submerged Gravel Wetland MDC 18 Minimum required treatment volume(cu ft) 40671 45571 21891 46301 43032 23610 56270 19 Bottom of the SGW cell(fmsl) 319 315.5 318 335 346 331.5 336 20 Elevation of the planting surface(fmsl) 323 319.5 322 339 350 335.5 340 21 Elevation at minimum 1"treatment volume 324.45 321.04 323.75 340.05 351.61 337.46 341.42 22 Elevation at ponding depth of design storm(fmsl)(lower weir) 324.5 321.25 324.5 340.25 351.8 338.4 341.5 23 Ponding depth of the minimum 1"treatment volume(in) 17.40 18.48 21.00 12.60 19.32 23.52 17.04 24 Ponding depth of design storm(in)(lower weir to planting surface) 18.00 21.00 30.00 15.00 21.60 34.80 18.00 25 Surface area of the SGW at planting surface(square feet) 24553 28518 11605 43292 26234 10970 38834 26 Surface area of the SGW at ponding depth of design storm(lower weir) 30999 32407 16075 46494 30929 15239 43498 27 Design volume of SCM(cu ft)(lower weir to planting surface) 41664 53310 34600 56116 51447 38004 61749 28 Is the SGW used for peak attenuation? Yes Yes Yes Yes Yes Yes Yes 29 Elevation of peak attenuation over planting surface(fmsl)(100-yr event) 327.47 324.21 326.68 342.28 354.5 340.49 344.31 30 Depth of peak attenuation over planting surface(in)(100-yr event) 53.64 56.52 56.16 39.36 54.00 59.88 51.72 31 Elevation of peak attenuation outlet above the planting surface(ft)(upper weir) 326 323.5 326 340.25 353.5 339.15 343.75 32 Height of peak attenuation outlet above the planting surface(in)(upper weir) 36.00 48.00 48.00 15.00 42.00 43.80 45.00 33 Diameter of the underdrain pipes(if applicable) 6" 6" 6" 6" 6" 6" 6" 34 Does the design include Internal Water Storage(IWS)? Yes Yes Yes Yes Yes Yes Yes 35 if so,elevation of the top of the IWS(fmsl) 322.5 319 321.5 338.5 349.5 335 339.5 Native Native Native Native Native Native Native 36 Wetland Wetland Wetland Wetland Wetland Wetland Wetland What type of vegetation will be planted? (grass,trees/shrubs,other)? Plants Plants Plants Plants Plants Plants Plants 37 Large Aggregate(Washed 57 Stone)Depth(inches) 36 36 36 36 36 36 36 38 Small Aggrgeate(Washed 78 Stone)Depth(inches) 4 4 4 4 4 4 4 39 Wetland Soil depth(inches) 8 8 8 8 8 8 8 40 Percentage of medium to coarse washed sand by volume 75-85 75-85 75-85 75-85 75-85 75-85 75-85 41 Percentage of fines(silt and clay)by volume 8-10 8-10 8-10 8-10 8-10 8-10 8-10 42 Percentage of organic matter by volume 5-10 5-10 5-10 5-10 5-10 5-10 5-10 Shredded Shredded Shredded Shredded Shredded Shredded Shredded 43 mulch or mulch or mulch or mulch or mulch or mulch or mulch or Type of organic material compost compost compost compost compost compost compost 44 Phosphorus Index(P-Index)of media(unitless) <30 <30 <30 <30 <30 <30 <30 45 Will compaction be avoided during construction? Yes Yes Yes Yes Yes Yes Yes 46 Depth of mulch,if applicable(inches) N/A N/A N/A N/A N/A N/A N/A 47 Type of mulch,if applicable N/A N/A N/A N/A N/A N/A N/A 48 How many clean out pipes are being installed? 7 9 4 9 13 5 8 49 Type of pretreatment that will be used: Forebay Forebay Forebay Forebay Forebay Forebay Forebay