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Home My WebLink AboutSW1221201_Supplement-EZ Form_20221215FORMS LOADED PROJECT INFORMATION - -- - -- 1 Project Name James River Equipment -Mills River 2 _ Project Area (ac) 16-61 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 NUMBER AND TYPE OF SCMS: 11m Infiltration System 12 Bioretention Cell 2 13 Wet Pond 14 Stormwater Wetland 15 Permeable Pavement� 16 Sand Filter 17 Rainwater Harvesting (RWH) 18 _ Green Roof _ 19 Level Spreader -Filter Strip (LS-FSjw__ 20 Disconnected Impervious Surface {DIS) 21 Treatment Swale 22 Dry Pond 23 StormFilter 24 Silva Cell 25 Bayfilter 26 Filterra FORMSLOADED DESIGNER CERTIFICATION 27 Name and Title: Mark Brooks, PE 28 Organization: Brooks Engineering Associates, PA 29 Street address: 15 Arlington Street 30 City, State, Zip: W Asheville, NC 28801 31 Phone number(s): 828-232-4700 32 Email: mbrooks@brooksea.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. Designer E i+ AL ' Sea! / !/ Signature o Des gner Date Z =I I k"F `- 1 Is this a high densityproject? Yes __ 2 If so, number of drainage areaslSCMs 2 3 Does this project have low density areas? �_ No 4 If so, number of low density drainage areas 0 5 Is alllparl of this project subject to previous rule versions? No CLICK TO LOAD FORM DRAINAGE AREA INFORMATION - Entire Site :'-: Bioretention 1 Bioretention .2 Bioretention 4 Type of SCM 5 Total drainage areas ft 510,681 225,834 284,847 6 Onsite drainage area (sq ft 510,681 225,834 284,847 7 Offsite drainage areas ft 0 0 0 _ 8 Total BUA in project (sq ft _ 370670 sf 170002 sf 200668 sf 9(sg New BUA on subdivided lots (subject to permitting) ft) NIA NIA NIA 10 New BUA not on subdivided lots (subject to permitting} (sf} 370670 sf 170002 sf 200668 sf 11 Offsite BUA (sq ft) 12 _-___� Breakdown of new BUA not on subdivided lots: Parking (sq ft) _ 36054 sf 846a sf 27586 sf Sidewalk (sq ft 1676 sf 1080 sf 596 sf _ Roof (sq ft 48321 sf 33821 sf 14500 sf Roadwa sq� Future (sq ft Other, please specify in the comment box below s ft 284619 sf 126633 st 157986 sf 13 New infiltrating permeable pavement on subdivided lots (sq ft) _ New infiltrating permeable pavement not on subdivided lots (sq ft) _14 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 18 Percent BUA _ 73% 75% 70% 19 tlesi n storm inches 1.49 in 1.51 in 20 Design volume of S_CM ft� 13961 of 16237 cf 21 Calculation method for design volume ADDITIONAL INFORMATION' Simple Simple 22 Please use this space to provide any additional information about the drainage area(s): Ocher Areas: Gravel Equipment Storage Pad 111.01,111,111,11,1 ' 1 1 Drainage area number 1 2 2 _ Minimum re uired treatment volume cu ft 13691 cf 16237 cf GENERAL MDC FROM 02H .1050 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)? 3A 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? Drawdown Orifice Drawdown Orifice 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)? NIA NIA 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 mm 17 NO —RETENTION Was the SCM designed by an NC licensed professional? Yes Yes CELL MDC FROM 021-11.1052 �18 SHWT elevation (fmsl) <2086 <2086 19 Bottom of the bioretention cell (fmsl) 2093.00 2091.00 20 Ponding depth of the design storm (inches) 12 in 12 in 21 _ Surface area of the bioretention cell (square feet) 17161 sf 10684 sf 22 Design volume of SCM (cu ft) 13691 cf 16237 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) .06 in/hr .25 inlhr 27 Diameter of the underdrain pipes (if applicable) 6 in 6 in 28 Does the design include Internal Water Storage (IWS)? Yes Yes 29 _ if so, elevation of the top of the IWS (fmsi) 2091.5 2089.5 30 Elevation of the planting surface (fmsl) 2093 2091 31 What type of vegetation will be planted? (grass, trees/shrub—s, other)? Grass Grass 32 Media depth (inches) 36 In 36 in 33 Percentage of medium to coarse washed sand by volume 84% 84% 34 Percentage of fines (silt and clay) by volume 8% 8% 35 Percentage of organic matter by volume 8% 8% 36 Type of organic material Pine Bark Fines Pine Bark Fines 37� Phosphorus Index (P-Index) of media (unitiess) 10 10 38 Will compaction be avoided during construction? Yes Yes 39 Will cell be maintained to a one inch/hour standard? _ Yes Yes 40 Depth of mulch, if applicable (inches) NIA NIA 41 Type of mulch, if applicable NIA NIA 42 How many clean out pipes are being installed? 7 7 43 Type of pretreatment that will be used: Grassed Swales Grassed Swales Bioretention 3 2:58 PM 12/14/2022