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Home My WebLink AboutSW5231001_Supplement-EZ Form_20240119 SUPPLEMENT-EZ COVER PAGE FORMS LOADED ,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) Width of ye etated setbacks provided(feet) 50+ 11111 Will the ve•etated setback remain vegetated? Yes 9 If BUA is •ro•osed 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 I13 '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 FORMS LOADED DESIGNER CERTIFICATION 27 ,Name and Title: Timothy S.Kennerly.PE 28 Or anization: Kennerly Engineering&Desi n,Inc. 29 Street address: 12133 N NC HWY 150,Ste.F 30 City,State,Zip: Winston-Salem,NC 27127 31 Phone numbers): (336)775-2118 32 Email: I 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 \‘0t 1ltlllliiiiit .\`‘ C•A Rp % � • •ESS•/p• /p SEAL • Signature of Designer • 29317 )- T • 1/77/24Sz<7/ l l t l l l t Date DRAINAGE AREAS 1 Is this a high densltyJpect? 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 CLICK TO LOAD FORM J DRAINAGE AR EA INFORMATION Entire Site 1 2 '' 3 4 5 4 j pe of SCM SGW SGW SOW SGW SGW 5 Total drainage area(sq ft) 6,290,511 602,870 649,915 _ 314068 691,733 620,730 6 Onsite drainage area(sq ft) 6,290,511 915 314,068 691,733 602,870 649, _ 620,730 7 Offsite drainage area Call '0 0 0 0 0 0 • tl 8 Total BUA in project(sq f _ 4860758 sf 508719 sf 571590 sf _ 274439 sf 578930 sf . 539140 sf New BUA on subdivided lots(subject to 9 permitting,jsg 1J New BUA not on subdivided rots(subject "to I 10 permitting)(sf) 3308058 sf 508719 sf 571590 sf 274439 sf 578930 sf 394085 sf 11 Offsite BUA(sq ft) 12 Breakdown of new BUA not on subdivided lots: 1 -Parking(sq ft) � 3308058 sf 508719 sf 571590 sf 274439 sf _ 578930 sf 394085 sf -Sidewalk(sq ft) 1 -Roof(sq ft) _ •Roadwayft) — �� (sq __.. _..__Future5sy -Other,please specify in the comment box below(sq ft) _ I New infiltrating permeable pavement on T 13 subdivided Iots-_(s-g fti _ New infiltrating permeable pavement not on 14 subdivided lots(sq ft) 1 Existing BUA that will remain(not subject to _15 eoamitting)(sq ft)� 1552700 s# 145055 sf- 16 Existing BUA that is already permitted(sq ft) ______r"' ____� 17 Existir BUA that will be removed(sq ft) 18 Percent BUA 70% 84% 88% 87% 84% 87% 19 Design storm(inches) 3.4 in 2.8 in 2.8 in 2.8 in 2,8 in _20 Design volume of SCM(cu ft) 59823 cf 78199 cf 42445 of 91341 cf 89902 cf 21 Calculation method for deli n volume Total Storage Total Stora a Total Storage Total Storage Total Storage ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): �,�_ DRAINAGE AREAS y1 Is this a hi h density project? Yes 2 If so number of drainage areas/SCMs 7 3 Does this ro ect have low den_ge areas? No 4 If so,number of low density drainage areas Is all/part of this project subject to previous rule 5 versions? No CLICK TO LOAD FORM DRAINAGE AREA INFORMATION Entire Site 6 7 4 Type of SCM SGW SGW 5 Total drainage area(sq ft) 6,290,511 358,934 ..r.. 794,851 6 Onsite drainage area(sq ft) 6290,511 358,934 794,851 • 7 Offsite drainage area(sq ft) 0 0 0 • 8 Total BUA in_project(sq ft) -4860758 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)(sfL 3308058 sf 294915 sf 706201 sf 11 Offsite BUA(aft) 12�Breakdown of new BUA not on subdivided lots: • -Parking(sq ftL 3308058 sf 294915 sf 706201 sf • -Sidewalk(sq -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)(sg,ftj 1552700 sf_ ___��_ • 16 Existing BUA that is already,�ermitted(sg,ft)_ • • • 17 Existing BUA that will be removed(sq ft) _ 18 Percent BUA • 706/0 • 82% 89% 19 Design storm(inches) • • 2.8 in _ 2.8 in • 20 Design volume of SCM(cu ft) • 46909 cf 83621 of 21 Calculation method for design volume Total Storage_.,_._. Total Storage ADDITIONAL INFORMATION •. 22 (Please use this space to provide any additional information about the drainage area(s): • SUBMERGED GRAVEL WETLANDS 1 Drainage area number 1 2 3 4 5 6 7 2 Minimum required treatment volume (cu ft) 42575 47738 23069 46830 45595 24241 1 58393 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 Does the SCM have retaining walls, gabion walls or other engineered side 6 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 1 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 If the SCM is on a single family lot, does (will?) the plat comply with General 13 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 Bottom of the SGW cell (fmsl) 319 315.5 319 335 346 331.5 336 19 Ponding depth of the 1" treatment volume 13" 19" 21" 13" 19" 24" 17" 20 Ponding depth of design storm (inches) 23" 27" 30" 19" 28" _ 35" 24" 21 Surface area of the SGW (square feet) 24553 28518 11605 43292 26234 10970 38834 22 Design volume of SCM (cu ft) 59823 78199 42445 91341 89902 46909 83621 23 Is the SGW used for peak attenuation? Yes Yes Yes Yes Yes Yes Yes 24 Depth of peak attenuation over planting surface (in) (100-yr event) 49" 57" 56" 41" 57" 60" 52" 25 Height of peak attenuation outlet above the planting surface (in) 36" 48" 48" _ 19" 42" 44" 45" 26 Diameter of the underdrain pipes (if applicable) 6" 6" 6" 6" 6" 6" 6" 27 Does the design include Internal Water Storage (IWS)? Yes Yes Yes Yes Yes Yes Yes 28 if so, elevation of the top of the IWS (fmsl) 322.5 319 322.5 338.5 349.5 335 339.5 29 Elevation of the planting surface (fmsl) 323 319.5 323 f 339 350 335.5 340 Native Native Native I Native Native Native Native 30 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 31 Large Aggregate (Washed 57 Stone) Depth (inches) 36 36 _ 36 36 36 36 36 32 Small Aggrgeate (Washed 78 Stone) Depth (inches) 4 4 4 4 4 4 4 33 Wetland Soil depth (inches) 8 8 8 8 8 8 8 34 Percentage of medium to coarse washed sand by volume 75-85 75-85 75-85 75-85 75-85 75-85 _ 75-85 35 Percentage of fines (silt and clay) by volume 8-15 8-15 8-15 8-15 8-15 8-15 __ 8-15 36 Percentage of organic matter by volume 5-15 5-15 5-15 5-15 5-15 5-15 _ 5-15 Shredded Shredded Shredded Shredded Shredded Shredded Shredded 37 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 38 Phosphorus Index (P-Index) of media (unitless) <30 <30 <30 <30 <30 <30 <30 39 Will compaction be avoided during construction? Yes Yes Yes Yes Yes Yes Yes 40 Depth of mulch, if applicable (inches) N/A N/A N/A N/A N/A N/A N/A 41 Type of mulch, if applicable N/A N/A N/A N/A N/A N/A N/A 42 How many clean out pipes are being installed? 7 9 4 9 13 5 8 43 Type of pretreatment that will be used: Forebay Forebay Forebay Forebay Forebay Forebay Forebay