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Home My WebLink AboutSW1190501_NBMS_SUPPLEMENT 7_15_19_7/15/2019SUPPLEMENT-EZ COVER PAGE LOAD SUPPLEMENT FORMS PROJECT INFORMATION 1 Project Name 2 Pro ect Area ac 3 Coastal Wetland Area 4 Surface Water Area (a North Buncombe Middle School 2.506 5 Ils this project High or Low Density? High 6 1 Does this proiect use an off -site SCM? No COMPLIANCE WITH 02H .1003( 7 Width of vegetated setbacks provided feet 30' 8 Will the vegetated setback remain vegetated? Yes 9 Ils BUA other that as listed in .1003 4 c-d out of the setback? no 10 I Is streambank stabilization proposed on this project? no NUMBER AND TYPE OF SCMS: 11 Infiltration System 0 12 Bioretention Cell 1 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 Bay -filter 0 26 1 Filterra 0 LOAD SUPPLEMENT FORMS DESIGNER CERTIFICATION 27 Name and Title: Travis Maxwell 28 Organization: Brooks Engineeering Associates 29 Street address: 17 Arlington Street 30 City, State, Zip: Asheville, N.C. 28801 31 1Phone numbers : 828-232-1331 32 Email: tmaxwelKDbrooksea.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. 0 AIIIII11jj//// CAI? �V'SSI �Ll _ = SEAL 025514 'fNGNE�¢� I /'/tf 1111111\\i 6�r� Signature of Designer � ��1�� 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 AREA INFORMATION Entire Site 1 4 Type of SCM Bioretention Cell Bioretention Cell 5 Total BUA in promect (sq ft 545172 sf 69985 sf 6permitting) New BUA on subdivided lots (subject to s ft 7permitting) New BUA outside of subdivided lots (subject to s 29585 sf 8 Offsite - total area (sq ft 9 Offsite BUA (sq ft 10 Breakdown of new BUA outside subdivided lots: Parking (sq ft 114729 sf 24626 sf Sidewalk (sq ft 23888 sf 1004 sf Roof (sq ft 352996 sf Roadway s ft 49724 sf Future (sq ft Other, please specify in the comment box below (sq ft 11 New infiltrating permeable pavement on subdivided lots (sq ft sf 12 New infiltrating permeable pavement outside of subdivided lots (sq ft sf 13permitting) Exisitng BUA that will remain (not subject to s ft 531671 sf 40400 sf 14 Existinci BUA that is already permitted (sq ft 15 Existing BUA that will be removed (sq ft 13501 sf 13501 sf 16 Percent BUA 43% 64 0 17 Design storm inches 1 in 1 in 18 IDesign volume of SCM cu ft 1297 cf 1297 cf 19 lCalculation method for design volume simple simple ADDITIONAL INFORMATION 20 Please use this space to provide any additional information about the drainage area(s): DRAINAGE AREA INFORMATION Entire Site 1 4 Type of SCM 5 Total BUA from project (sq ft) 6 1995 rules SL 2006-246 2008 rules 2017 rules 7 New BUA on subdivided lots (subject to permitting) (sq ft) 1995 rules SL 2006-246 2008 rules 2017 rules New BUA outside of subdivided lots (subject to permitting) (sf) 1995 rules SL 2006-246 2008 rules 8 2017 rules 9 Offsite - total area (sq ft) 1995 rules SL 2006-246 2008 rules 2017 rules 10 Offsite BUA (sq ft) 1995 rules SL 2006-246 2008 rules 2017 rules 11 IDesign storm (inches) 1995 rules SL 2006-246 2008 rules 2017 rules 12 Breakdown of new BUA: Parking (sq ft Sidewalk (sq ft Roof (sq ft Roadway s ft Future (sq ft Other, please specify in the comment box below (sq ft 13 New infiltrating permeable pavement on subdivided lots (sq ft 14 New infiltrating permeable pavement outside of subdivided lots (sq ft 15permitting) Exisitng BUA that will remain (not subject to s ft 16 Existina BUA that is already permitted (sq ft 17 Existing BUA that will be removed (sq ft 18 Percent BUA 19 Design volume of SCM cu ft 20 Calculation method for design volume ADDITIONAL INFORMATION 21 Please use this space to provide any additional information about the drainage area(s): BIORETENTION CELL Drainage area number Design volume of SCM (cu ft) IGFNFRAI MDC FROM n2H .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 71 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 Drawdown Orifice 9 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 complywith General MDC (9)? 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 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) LOWER THAN 2192 19 Bottom of the bioretention cell (fmsl) 2193.00 20 Ponding depth of the design storm (inches) 12 in 21 Surface area of the bioretention cell (square feet) 3114 sf 22 Design volume of the bioretention cell (cubic feet) 2917 cf 23 Is the bioretention cell used for peak attenuation? Yes 24 Depth of peak attenuation over planting surface (in) 25 Height of peak attenuation outlet above the planting surface (in) 26 Infiltration rate of the in situ soil (inch/hour) 1 in/hr 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) 2196.5 30 Elevation of the planting surface (fmsl) 2198 31 What type of vegetation will be planted? (grass, trees/shrubs, other)? Grass 32 Media depth (inches) 24 in 33 Percentage of medium to coarse washed sand by volume 85% 34 Percentage of fines (silt and clay) by volume 10% 35 Percentage of organic matter by volume 5% 36 Type of organic material mulch 37 Phosphorus Index (P-Index) of media (unitless) 10 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? 4 43 Type of pretreatment that will be used: gravel & grass ADDITIONAL INFORMATION Please use this space to provide any additional information about the 44 bioretention cell(s): Bioretention 4 9:29 AM 7/15/2019