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Home My WebLink AboutSW6210907_Supplement-EZ Form_20210930SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 j Project Name Timberland Gas Station 2 Project Area ac 4.392 3 Coastal Wetland Area ac 4 Surface Water Area (ac) _ 5 Is this ro ect 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)_ Will the vegetated setback remain vegetated? NIA 8 N/A No 9 tf BUA is proposed in the setback, does it meet NCAC 02H_1003 4 c-d ? 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 1 0 12 I3ioretention Cell 13 Wet Pond 0 �14 _ Stormwater Wetland 0 15 Permeable Pavement 0 16 Sand Filter 0 17 Rainwater Harvesting RWH 0 18 Green Roof 0 19 Level Spreader -Filter Strip LS-F5 0 20 Disconnected Impervious Surface (DIS)0 21 Treatment Swale _ 0� 22 lDry Pond 0 23 StormFilter 0 24 Silva Cell 0 25 Elayfilter 0 26 Filterra 0 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Carlo Pardo, PE 20 Organization: _:_ Triangle Site Demon, PLLC 29 street address: City, State, Zip: 4004 Barrett Drive. Suite 101 30 Raleigh, NC 27609 31 Phone numbers : 919-553-6570 32 Email_ cpardo@trianglesitedesign.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 know;edge 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. !!lyy11111ftllll/1 Z' k RQ( SEAL 051571IN - Signature of Designer q 6. Date DRAINAGE AREAS 1 Is this a high density ro ect? Yes 2 If so, number of drainage areas/SCMs 1 3 Does this promect have low density areas? No 4 If so, number of low density drainage areas 0 5 Is alllpart of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 4 Type of SCM - Infiltration Basin 5 Total drainage area (sq ft 191320 sf 126116 sf 6 Onsite drainage area (sq ft) 191320 sf 107849 sf 7 Offsite drainage area (sg ft 18267 sf 8 Total BUA in project sq ft 77923 sf 87964 sf 9 New BUA on subdivided lots (subject to permitting) (sq ft 10permitting) New BUA not on subdivided lots (subject to s 11 Offsite BUA (sq ft 18267 sf 12 Breakdown of new BUA not on subdivided lots: Parking (sq ft Sidewalk (sq ft 2338 sf 2338 sf Roof (sq ft 8000 sf 8000 sf Roadway s ft 67585 sf 59359 sf Future (sq ft Other, please specify in the comment box below s fi 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 1B Percent BUA 41% 70% 19 Desi n storm inches 1.0 in I Design volume of SCM cu fi 7123 cf _2D 21 Calculation method for design volume Simple Method ADDITIONAL INFORMATION 22 Please use this space to provide any additional information about the drainage area(s): Offsite Drainage area includes a portion of Calloway Road and the future Lot 68 in the Timberland Ranch development. INFILTRATION SYSTEM 1 Drainage area number 1 2 1 Minimum reauired treatment volume (cu ft) _ — 712 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 "VerticT far 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- ear storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes What is the method for dewatering the SCM for maintenance? Pump (preferred) _9 10 If applicable, will the SCM be cleaned out after construction? Yes 11 Does the maintenance access comply with General MDC (8)7 Yes 12 Does the drainage easement comply with General MDC (9)? Yes 13 If the SCM is an a single family lot, does (will?) the plat comply with General MDC 10 ? N/A 14 Is there an 0&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 licensed professional? Yes 18 1 Proposed slope of the subgrade surface (%) 0% 19 lAre terraces or baffles provided? No 20 IType of pretreatment: Forebay Solis Data 21 Was the soil investigated in the footprint and at the elevation of the infiltrations stem? Yes 22 SHWT elevation (fmsl) 366.00 23 Depth to SHWT per soils report (in) 180.00 24 Ground elevation at boring in soils report (fmsl) 381.00 25 Is a detailed hydrogeologic study attached if the separation is between 1 and 2 feet? Yes 26 Soil infiltration rate (inlhr) 11.00 27 IlFactor of safety (FS) (2 is recommended): 2.00 I lrlevatlons 29 Bottom elevation (fmsl 378 ft 30 13torage elevation fmsl 380. ft 31 1 Bypass elevation (fmsl) 380.7 ft For saslns only 32 Bottom surface area tt? 4975 ft 33 1 Storage elevation surface area ft 7075. ft Fnr Trpnehes Qnlv 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 geotextile fabric? 43 Has at least one inspection port been provided? Vofumes/Drawdown 44 IDesign volume of SCM cu ft 7123 cf 45 1 Time to draw down hours 3 hrs ADDITIONAL INFORMAT10N 46 Please use this space to provide any additional information about the infiltration syslem(s): Infiltration 1 8:06 AM 9/2/2021