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Home My WebLink AboutSW6220202_Supplement-EZ Form_20220223SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION Name Mject ject Area acastal Wetland Area rface Water Area (a Messer Parcels 12.24 5 1 Is this project High or Low Density? High 6 1 Does this protect use an off -site SCM? No COMPLIANCE WITH 02H .1003(4) 7 Width of vegetated setbacks rovided feet N/A 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 S stem 12 Bioretention Cell 13 Wet Pond 1 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 lBayfilter 26 1 Filterra FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Landon Lovelace, PE 28 Or anization: Underfoot Engineering, inc. 29 Street address: 1149 Executive Circle, Suite C 30 City, State, Zip: Cary, NC 27511 31 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. Seal �NC°A RO O� = r 032674 LL Signature of DeMggprt, FN� iN��,r�Q 2022.02.17 ' ��...Aj . Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 1 3 Does this roiect have low densit areas? No 4 If so, number of low density drainage areas 0 5 Is all/part of this project subject to previous rule versions? No FORMS LOADED AREA INFORMATION Entire Site 1 4 T pe of SCM Wet Pond 5 Total drainage area (sq ft 12.25 6 Onsite drainage area (sq ft 12.24 7 Offsite drainage area (sq ft 0.01 8 Total BUA in project (sq ft 166442 sf 9permitting) New BUA on subdivided lots (subject to s ft 88200 sf 10permitting) New BUA not on subdivided lots (subject to s 78242 sf 11 Offsite BUA (sq ft none 12 Breakdown of new BUA not on subdivided lots: Parking (sq ft none Sidewalk (sq ft 20374 sf Roof (sq ft none Roadway s ft 57868 sf Future (sq ft none Other, please specify in the comment box below (sq ft 13 New infiltrating permeable pavement on subdivided lots (sq ft none 14 New infiltrating permeable pavement not on subdivided lots (sq ft none 15permitting) Existing BUA that will remain (not subject to s ft none 16 Existina BUA that is already permitted (sq ft none 17 Existing BUA that will be removed (sq ft 6494 sf 18 Percent BUA 31 19 Design storm inches 7.8 in 20 Design volume of SCM cu ft 16861 cf 21 Calculation method for design volume SA/DA ADDITIONAL INFORMATION 22 Please use this space to provide any additional information about the drainage area(s): WET POND area number ERAL MDC FROM 02H .1050 3 Is the SCM sized to treat the SW from all surfaces at build -out? Yes 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 side slopes? No 7 Are the inlets, outlets, and receiving stream protected from erosion 10- ear storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the desi n volume? Yes 9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice 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 ? Yes 14 Is there an O&M Agreement that complies with General MDC (11)? Yes 151 Is there an O&M Plan that complies with General MDC 12 ? Yes 161 Does the SCM follow the device specific MDC? Yes 17 Was the SCM designed by an NC licensedprofessional? Yes WET POND 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 removal) (fmsl 260.50 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 261.00 22 Elevation of the bottom of the vegetated shelf (fmsl) 266.00 23 Elevation of the permanent pool (fmsl) 266.50 24 Elevation of the top of the vegetated shelf (fmsl) 267.00 25 Elevation of the temporary pool (fmsl) 267.75 26 Surface area of the main permanent pool (square feet) 16861 27 Volume of the main permanent pool (cubic feet) 63862 cf 28 Average depth of the main pool (feet) 3.50 ft 29 Average depth equation used Equation 3 30 If using equation 3, main pool perimeter (feet) 542.0 ft 31 If using equation 3, width of submerged veg. shelf (feet) .5 ft 32 Volume of the forebay (cubic feet) 12490 cf 33 Is this 15-20% of the volume in the main pool? Yes 34 Clean -out depth for forebay (inches) 6 in 351 Design volume of SCM (cu ft) 138089 cf 36 Is the outlet an orifice or a weir? Orifice 37 If orifice, orifice diameter (inches) 2 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 4.11 41 Are the inlet(s) and outlet located in a manner that avoids short- arcuitin ? Yes 42 Are berms or baffles provided to improve the flow path? Yes 43 Depth of forebay at entrance (inches) 6 in 44 Depth of forebay at exit (inches) 6 in 45 Does water flow out of the forebay in a non -erosive manner? 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 ermanent pooI? Yes 49 Does the pond minimize impacts to the receiving channel from the 1- r, 24-hr storm? Yes 50 Are fountains proposed? (If Y, please provide documentation that MDC 9 is met. No 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? Yes 53 Species of turf that will be used on the dam and embankment 54 Hasa plantinq plan been provided for the vegetated shelf? Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Wet Pond 1 10:40 AM 1/11/2022