The URL can be used to link to this page

Home My WebLink AboutSW6240702_Supplement-EZ Form_20240924 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name NC Highway 27 Self-Storage 2 Project Area ac 8.26 3 Coastal Wetland Area ac 0 4 Surface Water Area ac 0 5 Is this project High or Low Density? High 6 1 Does this project use an off-site SCM? No COMPLIANCE WITH 02H.1003(4) 7 Width of vegetated setbacks provided feet N/A 8 Will the vegetated setback remain vegetated? N/A 9 Ilf BUA is proposed in the setback,does it meet NCAC 02H.1003 4 c-d? N/A 10 Ils streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration S stem 12 Bioretention Cell 13 Wet Pond 14 Stormwater Wetland 2 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 lBayfilter 26 Filterra FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Landon Lovelace 28 Or anization: Underfoot Engineering,INC. 29 Street address: 1149 Executive Circle,Suite C 30 City,State,Zip: Cary, NC 27511 31 1 Phone numbers : 919-576-9733 32 Email: Iovelace@underfootengineering.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 G 10 a` 9 A- A�. ` 3 Signature of Designer _z S ca . 5s"� FNGI� ' ��''�•.dON„�M��,;;• 2024.07.02 Seal Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so,number of drainage areas/SCMs 2 3 Does this roiect have low densit 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 AREA INFORMATION Entire Site 1 2 Stormwater Stormwater Stormwater 4 Type of SCM Wetlands Wetland Wetland 5 Total drainage area(sq ft 360243 204190 100604 6 Onsite drainage area(sq ft 360243 199914 99426 7 Offsite drainage area(sq ft 0 4276 1178 8 Total BUA in project(sq ft 230622 sf 162484 sf 69382 sf New BUA on subdivided lots(subject to 9permitting) s ft N/A N/A N/A New BUA not on subdivided lots(subject to 10permitting) s 230622 sf 160633 sf 68526 sf 11 Offsite BUA(sq ft N/A 1851 sf 856 sf 12 Breakdown of new BUA not on subdivided lots: Parking(sq ft 57081 sf 22037 sf 35044 sf Sidewalk(sq ft None None None Roof(sq ft 55300 sf 55300 sf None Roadway s ft 88143 sf 83296 sf 4847 sf Future(sq ft 28635 sf None 28635 sf Other,please specify in the comment box below(sq ft New infiltrating permeable pavement on 13 subdivided lots(sq ft None None None New infiltrating permeable pavement not on 14 subdivided lots(sq ft None None None Existing BUA that will remain(not subject to 15permitting) s ft None None None 16 Existina BUA that is already permitted(sq ft None None None 17 Existing BUA that will be removed(sq ft 3772 sf None None 18 Percent BUA 64% 80% 69% 19 Design storm inches 1.0 in 1.0 in 20 Design volume of SCM cu ft 48441 cf 20765 cf 21 Calculation method for design volume Simple Method Simple Method ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): STORMWATER WETLAND 1 IlDrainage area number 3 1 2 Minimum required treatment volume cu ft 13037 cf 5623 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 31 6 Does the SCM have retaining walls,gabion walls or other No No en, n ineered side slo es? 7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes 10-ear storm 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 13 If the SCM is on a single family lot,does(will?)the plat comply with N/A N/A General MDC 10 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 rofessional? Yes Yes TER WETLAND MDC FROM 02H.1054 18 Design volume of SCM(cu ft) 48441 cf 20765 cf 19 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes circuiting? 20 Are berms or baffles provided to improve the flow path? Yes Yes 21 Does the orifice drawdown from below the top surface of the Yes Yes ermanentpool? 22 Does the wetland minimize impacts to the receiving channel from the Yes Yes 1- r 24-hrstorm? 23 Is a trash rack or other device provided to protect the outlet system? Yes Yes Elevations 24 Elevation,peak attenuation above temporary pool(if applicable) 192.40 194.80 fmsl 25 Elevation,temporary pool(top of the temporary inundation zone) 191.25 194.25 fmsl 26 Elevation,permanent pool(top of the shallow water zone)(fmsl) 190.00 193.00 27 Elevation,bottom of shallow water zone(fmsl) 189.25 192.25 28 Elevation,bottom of forebay deep pool at deepest point(at forebay 187.00 190.00 entrance)(fmsl 29 Elevation,bottom of forebay deep pool at shallowest point(at 188.00 191.00 forebay exit)(fmsl 30 Elevation,bottom of non-forebay deep pool at deepest point(fmsl) 188.50 191.50 Planting Zones 31 Area,total surface area of the SW wetland at temporary pool elev. 12,512.00 6,647.00 s 32 Area,temporary inundation zone at temporary pool elev.(sq ft) 4,729.00 2,622.00 33 Area,shallow water zone at temporary pool elev.(sq ft) 5,109.00 2,552.00 34 Area,forebay at temporary pool elev.(sq ft) 1,274.00 722.00 35 Area,non-forebay deep pool at temporary pool elev.(sq ft) 1,400.00 752.00 36 Percent area provided,temporary inundation zone(should be 30- 38% 39% 45 37 Percent area rovided,shallow water zone should be 35-45% 41% 38% 38 Percent area rovided,deep pool(forebay) should be 10-15% 10% 11 39 Percent area provided,deep pool(non-forebay)(should be 5-15%) 11% 11 Depths and Outlet 40 Peak attenuation depth above temporary inundation zone(inches) 14 in 19 in 41 Temporary inundation zone depth(temporary pool to permanent 15 in 15 in pool) inches 42 Shallow water zone depth(permanent pool to bottom of wetland) 36 in 36 in (inches) 43 Depth,forebay at entrance(permanent pool to bottom of forebay 36 in 36 in entrance)((inches) 44 Depth,forebay at exit(permanent pool to bottom of forebay exit) 24 in 24 in (inches) 45 Depth,non-forebay deep pools(permanent pool to deep pool 18 in 18 in bottom)(inches 46 If there is an orifice,diameter(inches) 2 in 1.25 in 47 If there is a weir,weir height(inches) 4 in 6 in 48 If there is a weir,weir length(inches) 12 in 12 in 49 Drawdown time for the temporary pool(days) 2.54 3.36 Wetland 3 2:34 PM 6/10/2024 STORMWATER WETLAND Soil and Plants 50 Soil amendment depth(inches) N/A N/A 51 Has a soil amendment specification been provided? No No 52 Has a landscaping plan that meets SW Wetland MDC(12)been Yes Yes provided? 53 Number of plants per 200 square feet(#)in the shallow water zone: 50 50 Does the temporary inundation zone planting comply with SW 54 Yes Yes Wetland MDC 14? 55 Are the dam structure and temporary fill slopes planted in non- Yes rENo s clum in turf rass? 56 Will cattails be planted in the wetland? No ADDITIONAL IN ATION Please use this space to provide any additional information about 57 the stormwaterwetland(s): Wetland 4 2:34 PM 6/10/2024