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HomeMy WebLinkAboutSW1200501_Supplement-EZ Form_20200506SUPPLEMENT-EZ COVER PAGE FORMS LOADED 1 Project Name Car Rider Improvements Fairview Elementary 2 Project Area (ac)1.9 3 Coastal Wetland Area (ac)0 4 Surface Water Area (ac)0 5 Is this project High or Low Density?High 6 Does this project use an off-site SCM? No 7 Width of vegetated setbacks provided (feet) 8 Will the vegetated setback remain vegetated?No 9 Is BUA other that as listed in .1003(4)(c-d) out of the setback?No 10 Is streambank stabilization proposed on this project? No 11 Infiltration System 0 12 Bioretention Cell 2 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-FS)0 20 Disconnected Impervious Surface (DIS)0 21 Treatment Swale 0 22 Dry Pond 0 23 StormFilter 0 24 Silva Cell 0 25 Bayfilter 0 26 Filterra 0 FORMS LOADED 27 Name and Title:Scott Burwell, P.E. 28 Organization:McGill Associates 29 Street address:55 Broad Street 30 City, State, Zip:Asheville, NC 28801 31 Phone number(s):828.252.0575 32 Email: Scott.Burwell@mcgillassociates.com Certification Statement: Designer ______________________________________________ Signature of Designer ______________________________________________ Date 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. PROJECT INFORMATION NUMBER AND TYPE OF SCMs: DESIGNER CERTIFICATION COMPLIANCE WITH 02H .1003(4) Seal DRAINAGE AREAS 1 Is this a high density project?Yes 2 If so, number of drainage areas/SCMs 2 3 Is all/part of this project subject to previous rule versions? No FORMS LOADED Entire Site 1 2 4 Type of SCM Bioretention Cell Bioretention Cell 5 Total BUA in project (sq ft) 6673 sf 18698 sf 6 New BUA on subdivided lots (subject to permitting) (sq ft) 7 New BUA outside of subdivided lots (subject to permitting) (sf) 6004 sf 14652 sf 8 Offsite - total area (sq ft) 9 Offsite BUA (sq ft) 10 Breakdown of new BUA outside subdivided lots: - Parking (sq ft) - Sidewalk (sq ft) - Roof (sq ft) - Roadway (sq ft) 6004 sf 14652 sf - Future (sq ft) - 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) 13 Exisitng BUA that will remain (not subject to permitting) (sq ft) 669 sf 4046 sf 14 Existing BUA that is already permitted (sq ft) 15 Existing BUA that will be removed (sq ft) 16 Percent BUA 100% 100% 17 Design storm (inches) 3 in 3 in 18 Design volume of SCM (cu ft) 1178 cf 2926 cf 19 Calculation method for design volume Simple Simple 20 DRAINAGE AREA INFORMATION ADDITIONAL INFORMATION Please use this space to provide any additional information about the drainage area(s): BIORETENTION CELL 1 Drainage area number 1 2 2 Design volume of SCM (cu ft) 1178 cf 2926 cf 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:V)?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-year 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 dewatering the SCM for maintenance?Other Other 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)? 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)?Yes Yes 16 Does the SCM follow the device specific MDC?Yes Yes 17 Was the SCM designed by an NC licensed professional?Yes Yes 18 SHWT elevation (fmsl) 19 Bottom of the bioretention cell (fmsl)2306.00 2270.00 20 Ponding depth of the design storm (inches)12 in 12 in 21 Surface area of the bioretention cell (square feet)1464 sf 2794 sf 22 Design volume of the bioretention cell (cubic feet)1743 cf 3133 cf 23 Is the bioretention cell used for peak attenuation?Yes Yes 24 Depth of peak attenuation over planting surface (in)24 in 24 in 25 Height of peak attenuation outlet above the planting surface (in)12 in 12 in 26 Infiltration rate of the in situ soil (inch/hour) 27 Diameter of the underdrain pipes (if applicable)8 in 8 in 28 Does the design include Internal Water Storage (IWS)?Yes Yes 29 if so, elevation of the top of the IWS (fmsl)2304.5 2268.5 30 Elevation of the planting surface (fmsl)2306.25 2270.25 31 What type of vegetation will be planted? (grass, trees/shrubs, other)?Grass Grass 32 Media depth (inches)30 in 30 in 33 Percentage of medium to coarse washed sand by volume 75-85%75-85% 34 Percentage of fines (silt and clay) by volume 8-15%8-15% 35 Percentage of organic matter by volume 5-10%5-10% 36 Type of organic material Pine Bark Fines Pine Bark Fines 37 Phosphorus Index (P-Index) of media (unitless) 50 50 38 Will compaction be avoided during construction?Yes Yes 39 Will cell be maintained to a one inch/hour standard? 40 Depth of mulch, if applicable (inches) 41 Type of mulch, if applicable 42 How many clean out pipes are being installed? 43 Type of pretreatment that will be used: 44 Please use this space to provide any additional information about the bioretention cell(s): BIORETENTION CELL MDC FROM 02H .1052 GENERAL MDC FROM 02H .1050 ADDITIONAL INFORMATION Bioretention 3 9:22 AM 4/21/2020