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Home My WebLink AboutSW6220101_Supplement-EZ Form_20220614SUPPLEMENT-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? I Woodshire Subdivision Phase 7 1 32.96 0 0 Both High and Low No COMPLIANCE WITH 02H .1003(4) 7 Width of ve etated setbacks provided feet 30 8 Will the vegetated setback remain vegetated? Yes 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 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 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 4D Site Solutions, Inc. 409 Chicago Drive - Suite 112 Fayetteville, NC 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 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? Yes 4 If so number of low 4-ify drainage areas 1 5 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 LID 1 4 Type of SCM Wet Pond Low Density 5 Total drainage area (sq ft 1435900 845,252 606,611 6 Onsite drainage area (sq ft 1435900 829,289 606,611 7 Offsite draina a area (sq ft 15963 15,963 0 8 Total BUA in project (sq ft 436196 sf 396196 sf 40000 sf 9 New BUA on subdivided lots (subject to ermitting) (sq ft 284000 sf 244000 sf 40000 sf 10 New BUA not on subdivided lots (subject to permitting) (sf) 136233 sf 136233 sf sf 11 10fifsite BUA (sq ft 15963 sf sf 12 Breakdown of new BUA not on subdivided lots: - Parking (sq ft - Sidewalk (sq ft 15984 sf 15984 sf - Roof (sq ft - Roadway s ft 107814 sf 107814 sf - Future (sq ft - Other, please specify in the comment box below (sq ft 12435 sf 12435 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 Existing BUA that is already ermitted (sq ft 17 Existing BUA that will be removed (sq ft 18 Percent BUA 30% 47% 7% 19 Design storm inches 1.0 in 20 Design volume of SCM cu ft 69983 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 The "other' impervious included above is the water surface of the pond 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? No 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 desi n 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 ? Is there an O&M Agreement that complies with General MDC (11)? N/A 14 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 269.50 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 270.50 221 Elevation of the bottom of the vegetated shelf (fmsl) 279.00 23 Elevation of the permanent pool (fmsl) 279.50 24 Elevation of the top of the vegetated shelf (fmsl) 280.00 25 Elevation of the temporary pool (fmsl) 283.43 26 Surface area of the main permanent pool (square feet) 9632 27 Volume of the main permanent pool (cubic feet) 45201 cf 28 Average depth of the main pool (feet) 6.00 ft 29 Average depth equation used Equation 3 30 If using equation 3, main pool perimeter (feet) 512.0 ft 31 If using equation 3, width of submerged veg. shelf (feet) 3.0 ft 32 Volume of the forebay (cubic feet) 7464 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) 69983 cf 361 Is the outlet an orifice or a weir? Orifice 37 If orifice, orifice diameter (inches) 2.5 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 2 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) 102 in 44 Depth of forebay at exit (inches) 90 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 Grass 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 2:11 PM 6/14/2022 LOW DENSITY DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 021-1.1003 1 Is project below density thresholds set forth in the applicable stormwater rule? Yes 2 Does project maximize dispersed flow and minimize channelization of flow? Yes 3 Has the use of piping been minimized per .1003(2)(c)? Yes 4 Side slopes of the vegetated conveyances (H:V) 3:1 5 Maximum velocity in the vegetated conveyances during the 10-year storm? 2.59 6 Are curb outlet swales proposed? No 7 Maximum longitudinal slope of curb outlet swale(s) (% ) 8 Bottom width of curb outlet swale(s) (feet) 9 Maximum side slope of curb outlet swale(s) (H:V) 10 Minimum length of curb outlet swale(s) (feet) 11 Are treatment swales used instead of curb outlet swales? 12 Is stormwater released at the edge of the setback as dispersed flow? Yes 13 Have stormwater outlets been designed to prevent downslope erosion? Yes 14 Are variations to rule .1003 proposed? No ADDITIONAL INFORMATION 15 JPlease use this space to provide any additional information about this low density project: