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Home My WebLink AboutSW6210101_Supplement form_20210204 SUPPLEMENT-EZ COVER PAGE FORMSLOADED PROJECT INFORMATION Project Name Grays Creek Safe Storage 1 2Project Area (ac)4.32 3Coastal Wetland Area (ac)0 4Surface Water Area (ac)0 5Is this project High or Low Density?High Does this project use an off-site SCM?No 6 COMPLIANCE WITH 02H .1003(4) 7Width of vegetated setbacks provided (feet)0 8Will the vegetated setback remain vegetated?N/A 9If BUA is proposed in the setback, does it meet NCAC 02H.1003(4)(c-d)?N/A Is streambank stabilization proposed on this project?No 10 NUMBER AND TYPE OF SCMs: 11Infiltration System1 12Bioretention Cell 13Wet Pond 14Stormwater Wetland 15Permeable Pavement 16Sand Filter 17Rainwater Harvesting (RWH) 18Green Roof 19Level Spreader-Filter Strip (LS-FS) 20Disconnected Impervious Surface (DIS) 21Treatment Swale 22Dry Pond 23StormFilter 24Silva Cell 25Bayfilter Filterra 26 FORMSLOADED DESIGNER CERTIFICATION 27Name and Title:Scott Brown, PE 28Organization:4D Site Solutions Inc. 29Street address:409 Chicago Dr. Ste. 112 30City, State, Zip:Fayetteville, NC 28306 31Phone number(s):910-426-6777 Email:sbrown@4dsitesolutions.com 32 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. Designer ______________________________________________ Signature of Designer ______________________________________________ Date Seal DRAINAGE AREAS 1Is this a high density project?Yes ge areas/SCMs1 2 If so, number of draina 3Does this project have low density areas?No 4 If so, number of low density drainage areas0 Is all/part of this project subject to previous rule 5versions?No FORMSLOADED Entire Site1 DRAINAGE AREA INFORMATION 4Type of SCM Infiltration ge area (sq ft)139568 5Total draina 6Onsite drainage area (sq ft)114042 7Offsite drainage area (sq ft)25526 ject(sq ft)114042 sf 8Total BUA in pro New BUA on subdivided lots (subject to 9permitting)(sq ft) New BUA not on subdivided lots (subject to 10permitting)(sf)114042 sf 11Offsite BUA (sq ft) 12Breakdown of new BUA not on subdivided lots: - Parking(sq ft)53727 sf - Sidewalk (sq ft)458 sf - Roof (sq ft)59857 sf - Roadway(sq ft) - Future (sq ft) - Other, please specify in the comment box below(sq ft) New infiltrating permeable pavement on 13subdivided lots (sq ft) New infiltrating permeable pavement not on 14subdivided lots (sq ft) Existing BUA that will remain (not subject to 15permitting)(sq ft) 16Existing BUA that is already permitted (sq ft) 17Existing BUA that will be removed (sq ft) 18Percent BUA82% 19Design storm (inches)1.0 in 20Design volume of SCM (cu ft)5930 cf Calculation method for design volumeSimple method 21 ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22drainage area(s): INFILTRATION SYSTEM 1 1Drainage area number 9122 cf 2Minimum required treatment volume (cu ft) GENERALMDCFROM02H.1050 Yes 3Is the SCM sized to treat the SW from all surfaces at build-out? Yes 4Is the SCM located away from contaminated soils? What are the side slopes of the SCM (H:V or enter "Vertical" for 5 3:1 )? trenches Does the SCM have retaining walls, gabion walls or other 6 No engineered side slopes? Are the inlets, outlets, and receiving stream protected from erosion 7 Yes (10-year storm)? Is there an overflow or bypass for inflow volume in excess of the 8 Yes design volume? Pump (preferred) 9What is the method for dewatering the SCM for maintenance? Yes 10If applicable, will the SCM be cleaned out after construction? Yes 11Does the maintenance access comply with General MDC (8)? Yes 12Does the drainage easement comply with General MDC (9)? If the SCM is on a single family lot, does (will?) the plat comply with 13 N/A General MDC (10)? 14Is there an O&M Agreement that complies with General MDC (11)? Yes Yes 15Is there an O&M Plan that complies with General MDC (12)? Yes 16Does the SCM follow the device specific MDC? Yes 17Was the SCM designed by an NC licensed professional? INFILTRATIONSYSTEMMDCFROM02H.1051 18Proposed slope of the subgrade surface (%) 19 Are terraces or baffles provided? Other 20 Type of pretreatment: {ƚźƌƭ5ğƷğ Was the soil investigated in the footprint and at the elevation of the 21 Yes infiltration system? 124.33 22SHWT elevation (fmsl) 89.00 23Depth to SHWT per soils report (in) 131.75 24Ground elevation at boring in soils report (fmsl) Is a detailed hydrogeologic study attached if the separation is 25 No between 1 and 2 feet? 0.66 26Soil infiltration rate (in/hr) 1.00 27Factor of safety (FS) (2 is recommended): Elevations 127 ft 29Bottom elevation (fmsl) 129. ft 30Storage elevation (fmsl) 129 ft 31Bypass elevation (fmsl) For Basins Only 2 4379 ft 32 Bottom surface area (ft) 2 8916. ft 33 Storage elevation surface area (ft) For Trenches Only 34Length (ft) 35Width (ft) 36Perforated pipe diameter, if applicable (inches) 37Number of laterals 38Total length of perforated piping 39Stone type, if applicable 40Stone porosity (%) 41Is stone free of fines? 42Is the stone wrapped in geotextile fabric? 43Has at least one inspection port been provided? Volumes/Drawdown 5930 cf 44Design volume of SCM (cu ft) 33 hrs 45Time to draw down (hours) ADDITIONAL INFORMATION Please use this space to provide any additional information about 46 the infiltration system(s): Infiltration110:52AM2/4/2021