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Home My WebLink AboutSW6211001_Supplement-EZ Form_20220210SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name 2 Project Area ac 3 Coastal Wetland Area ac Wayside Road Apartments 20.17 0 0 4 Surface Water Area ac 5 Is this Droiect High or Low Density? High 6 Does this protect use an off -site SCM? No COMPLIANCE WITH 02H .1003(4) 7 Width of ve etated setbacks provided 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 1 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 12 Bioretention Cell 13 Wet Pond 2 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 Ba filter IFilterra 26 FORMS LOADED NER CERTIFICATION Name and Title: Organization: Street address: City, State, Zip: Phone number(s): Email: C. Scott Brown, PE - Vice President 4D Site Solutions, Inc. 409 Chicago Drive - Suite 112 Fayetteville, North Carolina 28306 910-426-6777 sbrown(&4dsitesolutions.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 Signature of Designer Date WET POND 1 Drainage area number 2 Minimum required treat 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 3:1 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-yea r storm)? Yes Yes 8 Is there an overflow or bypass for inflow volume in excess of the desi n 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 ? Is there an O&M Agreement that complies with General MDC (11)? N/A N/A 14 Yes Yes 151 Is there an O&M Plan that complies with General MDC (12)? Yes Yes 161 Does the SCM follow the device specific MDC? Yes Yes 17 Was the SCM designed by an NC licensedprofessional? Yes Yes WET POND MDC FROM 02H .1053 18 Sizing 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 245.20 246.20 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 246.20 247.20 221 Elevation of the bottom of the vegetated shelf (fmsl) 249.20 251.20 23 Elevation of the permanent pool (fmsl) 249.70 251.70 24 Elevation of the top of the vegetated shelf (fmsl) 250.20 252.20 25 Elevation of the temporary pool (fmsl) 251.96 253.07 26 Surface area of the main permanent pool (square feet) 7408 11831 27 Volume of the main permanent pool (cubic feet) 20214 cf 37488 cf 28 Average depth of the main pool (feet) 3 ft 3 ft 29 Average depth equation used Equation 3 Equation 3 30 If using equation 3, main pool perimeter (feet) 424.0 ft 578.0 ft 31 If using equation 3, width of submerged veg. shelf (feet) 3.0 ft 3.0 ft 32 Volume of the forebay (cubic feet) 3847 cf 6942 cf 33 Is this 15-20% of the volume in the main pool? Yes Yes 34 Clean -out depth for forebay (inches) 48 in 66 in 35 Design volume of SCM (cu ft) 27089 cf 23998 cf 361 Is the outlet an orifice or a weir? Orifice Orifice 37 If orifice, orifice diameter (inches) 1.75 in 2.00 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 4.5 3.9 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 43 Depth of forebay at entrance (inches) 54 in 66 in 44 Depth of forebay at exit (inches) 48 in 60 in 45 Does water flow out of the forebay in a non -erosive manner? Yes Yes 46 Width of the vegetated shelf (feet) 6 ft 6 ft 47 Slope of vegetated shelf (H:V) 6:1 6:1 48 Does the orifice drawdown from below the top surface of the ermanent pooI? Yes Yes 49 Does the pond minimize impacts to the receiving channel from the 1- r, 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 Centipede Centipede 54 Hasa plantinq plan been provided for the vegetated shelf? Yes Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Wet Pond 1 4:32 PM 2/10/2022 DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 2 3 Does this oroiect have low densit areas? No 4 If so number of low 4-ify drainage areas 0 5 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 4 Type of SCM Wet Pond Wet Pond 5 Total drainage area (sq ft 878,537 300,353 273849 6 Onsite drainage area (sq ft 300,353 273849 7 Offsite draina a area (sq ft 8 Total BUA in project (sq ft 360808 sf 188578 sf 169858 sf 9permitting) New BUA on subdivided lots (subject to s ft 10 New BUA not on subdivided lots (subject to permitting) (sf) 360808 sf 188578 sf 169858 sf 11 Offsite BUA (sq ft 12 Breakdown of new BUA not on subdivided lots: - Parking (sq ft - Sidewalk (sq ft 35543 sf 22749 sf 12794 sf - Roof (sq ft 109036 sf 59267 sf 49769 sf - Roadway s ft 157607 sf 81453 sf 73782 sf - Future (sq ft - Other, please specify in the comment box below (sq ft 58622 sf 25109 sf 33513 sf 13 New infiltrating permeable pavement on subdivided lots (sq ft 14 New infiltrating permeable pavement not on subdivided lots (sq ft 15permitting) Existing BUA that will remain (not subject to s ft 16 lExistina BUA that is already permitted (sq ft 17 Existing BUA that will be removed (sq ft 18 Percent BUA 41% 63% 62% 19 Design storm inches 1.0 in 1.0 in 20 Design volume of SCM cu ft 27089 cf 23988 cf 21 Calculation method for design volume ADDITIONAL INFORMATION 11111111F- JlPlease use this space to provide any additional information about the 22 drainage area(s): Simple Simple "Other' impervious areas listed are to account for the water surface of the ponds, providing more accurate routing results.