Loading...
HomeMy WebLinkAboutSW5220302_Supplement-EZ Form_20220406FORMS LOADED DJECT INFORMATION 1 Project Name NCNG JFHQ Heli ad 2 Project Area ac 12.55 3 Coastal Wetland Area ac 0 4 Surface Water Area ac 0.09 5 Is this project High or Low Density? High 3 Does this project use an off -site SCM? No MPLIANCE WITH 02H .1003(4) 7 Width of vegetated setbacks provided feet 50, 3 Will the ve etated setback remain vegetated? Yes 3 Is BUA other that as listed in .1003 4 . c-d out of the setback? Yes 3 Is streambank stabilization proposed on this project? No MISER AND TYPE OF SCMs: 1 Infiltration System 0 2 Bioretention Cell 1 3 Wet Pond 0 4 Stormwater Wetland 0 5 Permeable Pavement 0 3 Sand Filter 0 7 Rainwater Harvesting RWH 0 B Green Roof 0 3 Level Spreader -Filter Strip LS-FS 0 7 Disconnected Impervious Surface (DIS) 0 1 Treatment Swale 0 2 DEy Pond 0 3 StormFilter 0 4 Silva Cell 0 5 Bayfilter 0 3 Filterra 0 FORMS LOADED SIGNER CERTIFICATION 7 Name and Title: 3 Organization: 3 Street address: 7 City,State Zip: 1 Phone number(s): 2 lEmail: , P.E., Sen_ for Timmons Grc Suite 102 191866-4505 Certification Statement: I certify, under penalty of law that this Supplement-FZ 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. ���•Q��H iCA fro oFEsSz0 •fyy: r = :Q SEAL 033612 - Lq--O� Signature of Designer I/ - Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 1 3 Is all/part of this project subject to previous rule versions? No FORMS LOADED Entire Site 1 4 T pe of SCM Bioretention 5 Total BUA in project (sq ft 119081 sf 119081 sf 6permitting) New BUA on subdivided lots (subject to s ft 7permitting) New BUA outside of subdivided lots (subject to s 118275 sf 118275 sf 8 Offsite - total area (sq ft 1017 sf 1017 sf 9 Offsite BUA (sq ft 836 sf 836 sf 10 Breakdown of new BUA outside subdivided lots: Parking (sq ft 118275 sf 118275 sf Sidewalk (sq ft sf sf Roof (sq ft sf sf Roadway s ft sf sf Future (sq ft sf sf Other, please specify in the comment box below (sq ft 11 New infiltrating permeable pavement on subdivided lots (sq ft 12 New infiltrating permeable pavement outside of subdivided lots (sq ft 13permitting) Exisitng BUA that will remain (not subject to s ft sf sf 14 Existing BUA that is already permitted (sq ft 15 Existing BUA that will be removed (sq ft 16 Percent BUA 22% 45 0 17 Design storm inches 1 in 18 Design volume of SCM cu ft 10028 cf 19 Calculation method for design volume Simple Method ADDITIONAL INFORMATION 20 Please use this space to provide any additional information about the drainage area(s): BIORETENTION CELL 1 1 (Drainage area number Design volume of SCM (cu ft) ERAL 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- year storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? What is the method for dewatering the SCM for maintenance? Yes 9 Drawdown Orifice 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)? No 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC (10)? 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 1 Does the SCM follow the device specific MDC? Yes 17 lWas the SCM designed by an NC licensed professional? Yes BIORETENTION CELL MDC FROM 02H .1052 18 SHWT elevation (fmsl) 420.00 19 Bottom of the bioretention cell (fmsl) 422.50 20 Ponding depth of the design storm (inches) 12 in 21 Surface area of the bioretention cell (square feet) 10050 sf 22 Design volume of the bioretention cell (cubic feet) 10028 cf 23 Is the bioretention cell used for peak attenuation? Yes 24 Depth of peak attenuation over planting surface (in) 21 in 25 Height of peak attenuation outlet above the planting surface (in) 18 in 26 Infiltration rate of the in situ soil (inch/hour) <2 27 Diameter of the underdrain pipes (if applicable) 6 in 28 Does the design include Internal Water Storage (IWS)? Yes 29 if so, elevation of the top of the IWS (fmsl) 424 30 Elevation of the planting surface (fmsl) 426 31 What type of vegetation will be planted? (grass, trees/shrubs, other)? Grass 32 Media depth (inches) 30 in 33 Percentage of medium to coarse washed sand by volume 82% 34 Percentage of fines (silt and clay) by volume 9% 35 Percentage of organic matter by volume 9% 36 Type of organic material Peat Moss 37 Phosphorus Index (P-Index) of media (unitless) 20 38 Will compaction be avoided during construction? Yes 39 Will cell be maintained to a one inch/hour standard? Yes 40 Depth of mulch, if applicable (inches) N/A 41 Type of mulch, if applicable N/A 42 How many clean out pipes are being installed? 12 43 IType of pretreatment that will be used: None ADDITIONAL INFORMATION Please use this space to provide any additional information about the 44 bioretention cell(s): SCM is on state owned land so a drainage easement is not applicable. Bioretention 4 9:19 AM 6/29/2020