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Home My WebLink AboutSW6210205_1644-Supplement form_20210310SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 lProiectName 2 Project Area ac 3 Coastal Wetland Area ac 4 Surface Water Area ac 5 Is this project High or Low Density? 6 Does this project use an off -site SCM? Spring Lake Ray Road Dollar General 3.11 No COMPLIANCE WITH 02H .1003(4) 7 Width of vegetated setbacks provided feet 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 ? 10 1 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 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 Ba filter IFilterra 26 FORMS LOADED IDESIGNER CERTIFICATION 27 IName and Title: 28 Organization: 29 Street address: 30 City, State, Zip: 31 Phone numbers : 32 Email: C. Scott Brown, PE - Vice President 4D Site Solutions, Inc 409 Chicago Drive, Suite 112 Fayetteville, NC 28306 910-426-6777 sbrown(a)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 DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 1 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 4 Type of SCM Wet pond Wet pond 5 Total drainage area (sq ft) 68825 68825 6 Onsite drainage area (sq ft 68825 68825 7 Offsite drainage area (sq ft 8 Total BUA in project (sq ft 47944 sf 47944 sf 9 New BUA on subdivided lots (subject to ermitting) (sq ft 10 New BUA not on subdivided lots (subject to permitting) (sf) 47944 sf 47944 sf 11 Offsite BUA (sq ft 12 Breakdown of new BUA not on subdivided lots: - Parking (sq ft 29839 sf 29839 sf - Sidewalk (sq ft - Roof (sq ft 8990 sf 8990 sf - Roadway s ft - Future (sq ft 2444 sf 2444 sf - Other, please specify in the comment box below (sq ft 6671 sf 6671 sf 13 New infiltrating permeable pavement on subdivided lots (sq ft 14 New infiltrating permeable pavement not on subdivided lots (sq ft 15 Existing BUA that will remain (not subject to ermitting) (sq ft 16 lExistina BUA that is already ermitted (sq ft 17 Existing BUA that will be removed (sq ft 18 Percent BUA 70% 70% 19 Design storm inches 1.0 in 1.0 in 20 Design volume of SCM cu ft 8185 cf 8185 cf 21 Calculation method for design volume Simple ADDITIONAL INFORMATION INNEW Please use this space to provide any additional information about the 22 drainage area(s): Simple The 6,671 sf is the pond surface area. The pond is impervious. 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 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? Yes 7 Are the inlets, outlets, and receiving stream protected from erosion 10-yea r storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes 9 What is the method for dewatering the SCM for maintenance? Pump (preferred) 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 O&M Agreement that complies with General MDC (11)? Yes 15 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 264.55 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 265.55 221 Elevation of the bottom of the vegetated shelf (fmsl) 170.55 23 Elevation of the permanent pool (fmsl) 171.05 24 Elevation of the top of the vegetated shelf (fmsl) 171.55 25 Elevation of the temporary pool (fmsl) 272.34 26 Surface area of the main permanent pool (square feet) 5791 27 Volume of the main permanent pool (cubic feet) 20896 cf 28 Average depth of the main pool (feet) 3.60 ft 29 Average depth equation used Equation 2 30 If using equation 3, main pool perimeter (feet) 31 If using equation 3, width of submerged veg. shelf (feet) 32 Volume of the forebay (cubic feet) 3367 cf 33 Is this 15-20% of the volume in the main pool? Yes 34 Clean -out depth for forebay (inches) 12 in 35 Design volume of SCM (cu ft) 8185 cf 361 Is the outlet an orifice or a weir? Orifice 37 If orifice, orifice diameter (inches) 1 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 4.3 41 Are the inlet(s) and outlet located in a manner that avoids short- circuiting? Yes 42 Are berms or baffles provided to improve the flow path? No 43 Depth of forebay at entrance (inches) 90 in 44 Depth of forebay at exit (inches) 78 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 Bermuda 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 10:24 AM 3/10/2021