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Home My WebLink AboutSW6220301_Supplement-EZ Form_20220325SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name 1 Project Area (ac) Long Point Subdivision 2 34.14 - 3 Coastal Wetland Area ac 4 Surface Water Area ac - 5 Is this project High or Low Density? High 6 Does this project use an off -site SCM? No COMPLIANCE WITH 02H .1003(4) 7 Width of vegetated 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 ? _ No 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 1 12 Bioretention Cell 0 13 Wet Pond 2 14 Stormwater Wetland 0 15 Permeable Pavement 0 16 Sand Filter 0 0 17 Rainwater Harvesting RWH 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 113ayfilter 0 26 1 Filterra 0 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Carlo Pardo. PE 28 Organization: Bowman North Carolina. Ltd. 29 Street address: 4006 Barrett Drive, Suite 104 30 City, State, Zip: Raleigh. NC 27609 31 Phone numbers : 919-553-6570 32 Email: cpardo@bowman.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. E5 • SEAL 051571 �� .c •• FNG! NEED : Q �`�� { Slgnalure of Designer Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 3 3 Does this ro�ect have low density 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 DRAINAGE AREA INFORMATION Entire Site 1 2 3 4 Type of SCM - Wet Pond Wet Pond Infiltration Basin 5 Total drainage area (sq ft) 1487139 sf 384558 113843 424106 6 Onsite drainage area (sq ft 1487139 sf 384558 113843 424106 7 Offsite drainage area (sq ft 8 Total BUA in project (sq ft 336735 sf 139536 sf 47257 sf 147943 sf 9 New BUA on subdivided lots (subject to permitting) (sq ft 10permitting) New BUA not on subdivided lots (subject to (sf) 11 Offsite BUA (sq ft 12 Breakdown of new BUA not on subdivided lots: - Parking (sq ft - Sidewalk (sq ft 1766 sf 1766 sf Roof (sq ft 242000 sf 104000 sf 26000 sf 112000 sf - Roadway s ft 85615 sf 35536 sf 12137 sf 35943 sf - Future (sq ft - Other, please specify in the comment box below s ft 7354 sf 7354 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 Existing BUA that is already permitted (sq ft 17 Existing BUA that will be removed (sq ft 9318 sf 931$ sf 18 Percent BUA 22 64% 36.3% 42% 35% 19 1 Design storm inches 1.0 in 1.0 in 1.0 in 20 1 Design volume of SCM cu ft 12068 cf 4029 cf 12863 cf 21 lCalculation method for design volume Simple Method Simple Method 1 Simple Method ADDITIONAL INFORMATION 22 Please use this space to provide any additional information about the draina a areas : Entire Site: Existing 9,318 sf Impervious Area to be removed from DA2 Other: Pool & Building from DA2 There is 1,999 sf of impervious roadway area that will bypass Wet Pond 2 WET POND 1 Drainacle area number 1 2 21 Minimum fe uired treatment volume cu ft 12068 cf 4029 cf GENERAL MOC 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: ? 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- ear 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 clewatering 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 ? N/A N/A 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)? 1 Yes Yes 161 Does the SCM follow the devicespecific MDC? Yes Yes 17 Was the SCM designed by an NC licensedprofessional? Yes Yes WET PQNQ MQC 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 250.00 247.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 251.00 248.00 22 Elevation of the bottom of the vegetated shelf (fmsl) 258.50 252.50 23 Elevation of the permanent pool fmsl 259.00 253.00 24 Elevation of the top of the vegetated shelf (fmsl) 259.50 253.50 25 Elevation of the tem ora pool (fmsl) 259.80 253.80 26 Surface area of the main permanent pool (square feet 11690 2850 27 Volume of the main permanent pool (cubic feet) 42894 cf 6423 cf 28 Average depth of the main pool feet 4.47 ft 3.02 ft 29 1 Average depth euation used Equation 3 Equation 3 30 If using a uation 3, main pool perimeter (feet) 747.0 ft 274.0 ft 31 If using equation 3, width of submerged veg. shelf feet 3.0 ft 3.0 ft 32 Volume of the foreba (cubic feet) 8120 cf 1024 cf 33 Is this 15-20% of the volume in the mainpool? Yes Yes 34 Clean -out depth for foreba inches 18 in 18 in 35 Design volume of SCM (cu ft 12068 cf 4029 cf 36 1 Is the outlet an orifice or a weir? Orifice Orifice 37 If orifice, orifice diameter (inches) 1.75 in 1.00 in 38 If weir, weir height (inches 39 If weir, weir length inches 40 Drawdown time for the temporary pool (days) 2.52 2.40 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 flowpath? Yes Yes 43 Depth of forebay at entrance (inches) 30 in 30 in 44 Depth of forebay at exit (inches) 24 in 24 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: 6:1 6:1 48 Does the orifice drawdown from below the top surface of the permanentpool? 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 Hybrid Bermuda Hybrid Bermuda 54 Hasa plantinO Dian been Drovided for the vegetated shelf? Yes Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Entire Site: Existing 9,318 sf Impervious Area to be removed from DA2 There is 1,999 sf of impervious roadway area that will bypass Wet Pond 2 Wet Pond 1 1:21 PM 3/14/2022 INFILTRATION SYSTEM 1 Drainage area number 3 2 1 Minimum required treatment volume (cu ft) 128633 cf 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 or enter "Vertical' for trenches)? 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 design volume? Yes 9 jWhat 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 16 Does the SCM follow the device specific MDC? Yes 17 Was the SCM designed by an NC licensedprofessional? Yes INFILTRATION SYSTEM MDC FROM 02H .1051 18 1 Proposed slope of the subgrade surface(%) 0% 19 jAre terraces or baffles provided? No 20 IType of pretreatment: Forebay I Snlh nntn 21 Was the soil investigated in the footprint and at the elevation of the infiltrations stem? Yes 22 SHWT elevation fmsl 241.00 23 Depth to SHWT per soils report (in) 87.60 24 Ground elevation at boring in soils report (fmsl) 248.30 25 Is a detailed hydrogeologic study attached if the separation is between 1 and 2 feet? N/A 26 Soil infiltration rate inlhr 11.00 27 Factor of safes (FS) (2 is recommended): 2.00 Elevations 29 Bottom elevation (fmsl) 246 ft 30 Stora a elevation fmsl 247.1 ft 31 1 Bypass elevation (fmsl) 249.9 ft For Basins Only 32 1 Bottom surface area ft2 11195 ft 33 IStorage elevation surface area (ft2) 13240. ft For Trenches Onlv 34 Length(ft 35 Width (ft) 36 Perforated pipe diameter, if applicable (inches) 37 Number of laterals 38 Total length of perforated piping 39 Stone type, if applicable 40 Stone porosity 41 Is stone free of fines? 42 Is the stone wrapped in Qeotextile fabric? 43 Has at least one inspection port been provided? Volumes/Drawdown 44 IDesign volume of SCM (cu ft) 12863 cf 45 1 Time to draw down hours) 2.5 hrs ADDITIONAL INFORMATION 46 Please use this space to provide any additional information about the infiltration system(s): Infiltration 1 3:02 PM 3/14/2022