The URL can be used to link to this page

Home My WebLink AboutSWA000204_Supplement-EZ Form_20230425SUPPLEMENT-EZ COVER PAGE FORMS LOADED -71 PROJECT INFORMATION 1 Project -Nam -------------e_—.---- The Glenns II 2 Project Area (ac)_-_._____ _--__._ 70.19 3 Coastal Wetland Area (ac) ---------------------- p 4 Surface Water Area (ac) p 5 Is this project High or Low Density? High 6 Does this project use an off -site SCM? No COMPLIANCE WITH 02H .4003(4 7 Width of vegetated setbacks provided (feet) WA 8 Will the vegetated setback remain vegetated? N/A 9 If BUA is proposed in the setback, does it meet NCAC 02H.I003 4 c-d)? N/A 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System p 12 Bioretention Cell p 13 Wet Pond p 14 Stormwater Wetland 2 15 Permeable Pavement p 16 Sand Filter p 17 Rainwater Harvesting RWH p 18 Green Roof p 19 Level Spreader -Filter Strip LS-FS) p 20 Disconnected Impervious Surface DIS) p 21 Treatment Swale p 22 Dry Pond p 23 Storm Filter p 24 Silva Cell p 25 lBayfilter p 26 1 Filterra p FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Vince G. Keene, P.E. x 28 Organization_ Yarbrough -Williams & Houle, Inc. € 29 Street address: ... - -- --- - P.O. Box 1198 30 City,, State Zip. Pineville, NC 28134 ( 31 32 iPhone number(s): Email: 704=556-1990 vincek@y-wh.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, opcoification3, operation and meintenence agreements and other, suppuitiny iidunnatiun die uunsislent with the Inrunndtlon provided here. Designer i 0 L Seal AL 3 Signa a igner Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 2 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 4 Type of SCM Entire Site 1 Wetland Wetland Wetland 5 Total drainage area (sq ft 1634806 871635 763171 6 lonsite drainage area (sq ft 767091 763171 7 Offsite drainage area (sq ft 104544 0 8 Total BUA in project (sq ft 252648 sf 240451 sf 9 � New BUA on subdivided lots (subject to permitting) (sq ft 181720 sf 184800 sf 10permitting) 11 12 New BUA not on subdivided lots (subject to s 111048 sf 4,698 sf 85051 sf 0 sf Offsite BUA s ft Breakdown of new BUA not on subdivided lots: Parkin s ft Sidewalks ft 0 sf 0 sf 16730 sf 0 sf 8962 sf 0 sf Roof (sq ft Roadway sq ft) 82899 sf 8850 sf 53629 sf 9000 sf Future (sq ft) _ Other, please specify in the comment box below (sq ft 13 _ New infiltrating permeable pavement on subdivided lots s ft 0 sf 0 sf 14 New infiltrating permeable pavement not on subdivided lots (sq ft 0 sf 0 sf Existing BUA that will remain (not subject to 15permitting) s ft 16 Existing BUA that is already permitted (sq ft 17 ' Existing BUA that will be removed (sq ft) 18 l Percent BUA 19 Design storm inches.) 20 Design volume of SCM (Cu ft) 21 Calculation method for design volume ,ADDITIONAL INFORMATION Please use this space to provide any additional information about the f' 22 drainage area(s): 4,698 sf 0 sf 0 sf 0 sf 0 sf 0 sf 29% 32% 1.0 in 1.0 in 22580 cf 21214 cf 1"WQV 111WOV STORMWATER WETLAND 1 Drainage area number 2 Minimum required treatment volume_ (cu ft) GENERAL MDC FROM 02H .1050 3' 4 5 6 _.. Is the SCM sized to treat the SW from all surfaces at build -out? Is the SCM located away from contaminated soils? What are the side slopes of the SCM (H:V)? Yes Yes Yes Yes 3:1 No Yes Yes 3:1 1 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No 7 Are the inlets, outlets, and receiving stream protected from erosion (10-yes year storm)? 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes PUMP (preferred) Yes Yes Yes N/A 9 What is the method for dewatering the SCM for maintenance? Pump referred 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 General MDC (10)? N/A 14 Is there an 0&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 Yes Yes 16 17 Does the SCM follow the device specific MDC? Was the SCM designed by an NC licensed professional? Yes Yes Design volume of SCM (cu ft) re the inlets) and outlet located in a manner that avoids short- Acircuitin ? Yes Yes F118 9 20 Are berms or baffles provided to improve the flowpath? Yes No Yes Yes No Yes 21 Does the orifice drawdown from below the top surface of the permanentpool? 22 Does the wetland minimize impacts to the receiving channel from the 1- r, 24-hr storm? 23 Is a trash rack or other device provided to protect the outlet system?T Yes Yes 24 Elevation, peak attenuation above temporary pool (if applicable) (fmsl) 0.00 0.00 25 Elevation, temporary pool (top of the temporary inundation zone) (fmsl) 582.00 578.50 26 Elevation, permanent pool (top of the shallow water zone) (fmsl) 27 Elevation, bottom of shallow water zone fmsi) 28 Elevation, bottomfmsl of forebay deep pool at deepest point (at forebay entrance 579.00 578.50 578.00 578.00 574.50 574.50 29 Elevation, bottom of forebay deep pool at shallowest point (at forebay exit) (fmsl) 577.00 577.00 30 Elevation, bottom of non-forebay deep pool at deepest point (fmsl) 575.00 575.00 31 Area, total surface area of the SW wetland at temporary pool elev. (sq ft) 28 866.00 19,243.00 32 Area, temporaryinundation zone at tem ora temporary pool elev. (sq ft 10,548.00 8,359.00 33 Area, shallow water zone at temporary pool elev. (sq ft) _ 11,104.00 Area, forebay at temporary pool elev. (sq ft) 3,319.00 Area, non-forebay deep pool at temporary pool elev_.(sq ft) 3,895.00 Percent area provided, temporary inundation zone (should be 30-45%) 37% Percent area provided, shallow water zone should be 35-45%) 38% 7,854.00 34 2,598,00 35 2,360.00 36 43% 37 41% 38 Percent area provided, deep pool(forebay) (should be 10-15%) 11 % 14% 39 Percent area provided, deep pool (non-forebay) (should be 5-15%) 13% 12% Depths and Outlet - 40 Peak attenuation depth above temporary inundation zone (inches) 8 in 10 in 41 Temporary inundation zone depth (temporary pool to permanent pool) inches 8 in 13 in 42 Shallow water zone depth (permanent pool to bottom of wetland) (inches 5 in 5 in 43 Depth, forebay at entrance (permanent pool to bottom of forebay ontranoo inohoo) _ 35 in 35 in 44 Depth, forebay at exit (permanent pool to bottom of forebay exit) (inches 17 in 17 in 45 Depth, non-forebay deep pools (permanent pool to deep pool bottom) (inches) If there is an orifice, diameter (inches) — --he 29 in 29 in 46 3 in 2 in 47 — - If there is a weir, weir ight inches No No _48 If there is a weir, weir length (inches) No 49 Drawdown time for the temporaryt pool (days) Wetland 1 12:48 PM 3/3/2023 STORMWATER WETLAND Soil and Plants 50 Soil amendment depth inches 24 in 24 in 51 Has a soil amendmentspecification beenprovided? Yes Yes 52 Has a landscaping plan that meets SW Wetland MDC (12) been provided? Yes Yes 53 Number of plants per 200 square feet (#) in the shallow water zone: 54 Does the temporary inundation zone planting comply with SW Wetland MDC (14)? _ _ _ _. Yes Yes 55 Are the dam structure and temporary fill slopes planted in non- cmping turfgrass? '. Yes Yes 56 Will cattails be planted in the wetland? No No ADDITIONAL INFORMATION 57 Please use this space to provide any additional information about the stormwater wetland(s): Pull down does not work on #53. But the number of plants per 200 sf is 50. I Wetland 2 12:48 PM 3/3/2023