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Home My WebLink AboutSW5210201_SUPPLEMENT EZ - ALL PAGES_20210209SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 lProiectName Project Area (ac) Coastal Wetland Area (ac) Surface Water Area (ac) Is this project High or Low Density? Does this protect use an off -site SCM? Essex Townes/Essex 37.35 0 1.22 No COMPLIANCE WITH 02H .1003(4) 7 Width of vegetated setbacks provided feet 50 8 Will the vegetated setback remain vegetated? Yes 9 Is BUA other that as listed in .1003 4 c-d out of the setback? No 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 0 12 Bioretention Cell 0 13 Wet Pond 2 14 Stormwater Wetland 0 15 Permeable Pavement 0 16 Sand Filter 0 17 Rainwater Harvesting RWH 0 18 Green Roof 0 19 Level Spreader -Filter Strip LS-FS 0 20 Disconnected Impervious Surface (DIS) 0 21 Treatment Swale 0 22 Dry Pond 0 23 StormFilter 0 24 Silva Cell 0 25 Ba filter IFilterra 0 26 0 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Jonathan Eakins, PE 28 Organization: The Nau Company, PLLC 29 Street address: PO Box 810 30 City, State, Zip: Rolesville, NC 27571 31 Phone numbers : 919-435-6394 x4 32 Email: Ieakins(a)thenauco.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. Signature of D signer 1 /28/2021 Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 2 3 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 4 T pe of SCM Wet pond Wet pond 5 Total BUA in project (sq ft 436678 sf 389123 sf 6 New BUA on subdivided lots (subject to ermitting) (sq ft 297575 sf 244906 sf 7 New BUA outside of subdivided lots (subject to ermittin s 139103 sf 144217 sf 8 Offsite -total area (sq ft sf sf 9 Offsite BUA (sq ft sf sf 10 Breakdown of new BUA outside subdivided lots: - Parking (sq ft sf sf - Sidewalk (sq ft sf sf - Roof (sq ft sf sf - Roadway s ft 139103 sf 144217 sf - Future (sq ft sf sf - Other, please specify in the comment box below (sq ft sf sf 11 New infiltrating permeable pavement on subdivided lots (sq ft sf sf 12 New infiltrating permeable pavement outside of subdivided lots (sq ft sf sf 13 Exisitng BUA that will remain (not subject to ermitting) (sq ft sf sf 14 lExistina BUA that is already ermitted (sq ft sf sf 15 Existing BUA that will be removed (sq ft sf sf 16 Percent BUA 55% 55% 17 Design storm inches 1 in 1 in 18 Design volume of SCM cu ft 36039 cf 32142 cf 19 Calculation method for design volume Simple method Simple method ADDITIONAL INFORMATION 20 Please use this space to provide any additional information about the drainage area(s): WET POND 1 Drainage area number 21 Design volume of SCM (cu ft) GENERAL MDC FROM 02H .1050 1 (North) 2 (South) 36039 cf 32142 cf 31 Is the SCM sized to treat the SW from all surfaces at build -out? Is the SCM located away from contaminated soils? Ye6 Yes 4 Yes 3:1 Yes 3:1 5 What are the side slopes of the SCM (H:V)? 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No No 7 Are the inlets, outlets, and receiving stream protected from erosion (10-year storm)? Yes Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes Yes 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 General MDC (10)? No No 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 professional? Yes Yes IWFT POND MDC FROM 02H _1053 18 Method used SA/DA SA/DA 19 Has a stage/storage table been provided in the calculations? Yes Yes 20 Elevation of the excavated main pool depth (bottom of sediment removal) (fmsl) 368.00 314.00 21 Elevation of the main pool bottom -(top of sediment removal) (fmsl) 367.00 313.00 22 Elevation of the bottom of the vegetated shelf (fmsl) 372.00 317.00 23 Elevation of the permanent pool (fmsl) 373.00 318.00 24 Elevation of the top of the vegetated shelf (fmsl) 373.00 318.00 25 Elevation of the temporary pool (fmsl) 374.80 319.80 26 Surface area of the main permanent pool (square feet) 18350:1 16296:1 27 Volume of the main permanent pool (cubic feet) 54266 cf 39448 cf 28 Average depth of the main pool (feet) 3.00 ft 3.00 It 29 Average depth equation used Equation 2 Equation 3 301 If using equation 3, main pool perimeter (feet) 653.0 ft 31 If using equation 3, width of submerged veg. shelf (feet) 6.0 ft 32 Volume of the forebay (cubic feet) 10536 cf 6428 cf 33 Is this 15-20% of the volume in the main pool? Yes Yes 34 Clean -out depth for forebay (inches) 12 in 12 in 35 Design volume of SCM (cu ft) 36039 cf 32142 cf 36 Is the outlet an orifice or a weir? Orifice Orifice 371 If orifice, orifice diameter (inches) 4 in 3 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 2.8 4.7 41 Are the inlet(s) and outlet located in a manner that avoids short- circuiting? Yes Yes 42 Are berms or baffles provided to improve the flow path? No No 431 Depth of forebay at entrance (inches) 72 in 44 Depth of forebay at exit (inches) 36 in 45 Does water flow out of the forebay in a non -erosive manner? Yes Yes 46 Width of the vegetated shelf (feet) 6 It 6 It 47 Slope of vegetated shelf (H:V) 6:1 6:1 48 Does the orifice drawdown from below the top surface of the permanent pool? Yes Yes 49 Does the pond minimize impacts to the receiving channel from the 1- yr, 24-hr storm? Yes Yes 50 Are fountains proposed? (If Y, please provide documentation that MDC(9) is met.) No No 51 Is a trash rack or other device provided to protect the outlet system? Yes Yes 52 Are the dam and embankment planted in non -clumping turf grass? Yes Yes 53 Species of turf that will be used on the dam and embankment fescue/bermuda fescue/bermuda Has a planting plan been provided or the vegetate shelf.? es Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Wet Pond 1 11:36 AM 1/28/2021