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Home My WebLink AboutSW1210902_Supplement-EZ Form_20220425SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name Broadpolnte Industrial Facility 2 Project Area ac 25,064 3 Coastal Welland Area ao 0 4 Surface Water Area ac 0.006 5 Is this project High or Low Density? Both HI h and Low Densif 6 IDoes this project use an off -site SCM? No COMPLIANCE WITH 02H .1003[4] 7 Width of ve etated setbacks provided feet 30 e Will the vegetated setback remain vegetated? Yes 9 If BUA is proposed in the setback, does it meet NCAC 02H.1003 4 e d ? Yes 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 0 12 Biorelention Cell 0 13 Wet Pond 0 14 Stormwater Welland 0 15 Permeable Pavement 0 16 Sand Filter 1 17 Rainwater Harvesting RWH 0 18 Green Roof 0 19 Level Spreader -Filter Strip LS-FS 0 20 Disconnected Impervious Surface O15 0 21 Treatment Swale 0 22 Dry Pond 0 23 StormFiller 0 24 Silva Cell 0 25 Ba fitter 0 26 Hlorra 0 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Daniel H alt 28 Organization: Wade Trim Ina 29 Street address: 53 North Market Street 30 City, Stale, Zip: Asheville, NC 28801 31 Phone numbers : 8282551197 32 Email: rhyall@wadetrim.com Certification Statement: I certify, under penally 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 engfneering plans, specificalions, operation and maintenance agreements and other supporting information are consistent with the information provided here. ti,,�nrtrrrunr r GAR0<j''%, ��`•`�O� ti PN0 S C., rW �05 �, _ No �T,4. 0 _ e A � r • (a � +r of Designer Z®le?e- Dat DRAINAGE AREAS 1 Is this a hi h densityproject? Yes 2 If so, number of drainage areaslSCMs 1 3 Does this project have low densityareas? Yes 4 If so, number of low densitydrainage areas 1 r5 Is alllpart of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 LD 1 4 Type of SCM NIA Sand Filter Dispersion Flow, & Vegetated Conve ence 5 Total drainage area (sq ft 7092049___ 273174 818875 6 Onsite drainage area (sq ft 1092049 0 _ 223399 sf NIA 273174 818875 7 Offsite drainage area (sq fl 0 0 8 Total BUA in project s ft 21680i sf 6599 sf 9permitting) New BUA on subdivided lots (subject to s fl NIA NIA 10permitting) New BUA not on subdivided lots (subject to s 223399 sf 216801 sf 6599 sf 11 Offsite BUA (scl ft sf sf sf 12 Breakdown of new BUA not on subdivided lots: Parking (sq fl 97872 sf 91274 sf 6599 sf - Sidewalk (sq ft 4965 sf 4965 sf sf Roof (sq fl 120562 sf 120562 sf sf - Roadway (s ft NIA NIA NIA Future (sq fE NIA NIA NIA - Other, please specify in the comment box below (sq fl WA NIA NIA 13 New infiltrating permeable pavement on subdivided lots (sq ft WA NIA NIA 14 New infiltrating permeable pavement not on subdivided lots (sq ft WA NIA NIA 15permitting) Existing BUA that will remain (not subject to s ft WA NIA NIA 16 Existing BUA that is already permitted (sq ft WA NIA i 7 Existing BUA that will be removed (sq fl NIA NIA _NIA NIA_ 18 Percent BUA 21% 79% _ _ 1% 19 Design storm Inches 1.0 in 1.0 in NIA 20 Design volume of SCM cu fl NIA 13417 cf NIA 21 lCalculation method for design volume NIA Simple Method NIA ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 ldfainage area(s): LD1 designed to have sufficient dispersion at pipe outlet; sized for 10 year storm event LOW DENSITY DESIGN REQUIREMENTS FOR LOW DENSIrL PROJECTS FROM 02H .1003 1 Is project below density thresholds set forth in the applicable stormwater rule? Yes 2 IDoes project maximize dispersed flow and minimize channehzation of flow? Yes 3 Has the use of piping been minimized per .1003(2)(c)? Yes 4 Sfde slopes of the vegetated conveyances (H:V) 2:1 5 Maximum veracity in the vegetated conveyances during the 10-year storm? 6 6 Are curb outlet swales proposed? No 7 Maximum longitudinal slope of curb outlet swale(s) (%) 0 Bottom width of curb outlet swale(s) (feet) 9 Maximum side slope of curb outlet swale(s) (H:V) 10 Minimum length of cufb outlet swale(s) (feet) 11 Are treatment swales used instead of curb outlet swales? No 12 Is stormwater released at the edge of the setback as dispersed flow? Yes 13 Have stormwater outlets been designed to prevent downslope erosion? Yes 14 JAre variations to rule .1003 proposed? No ADDITIONAL INFORMATION 15 please use this space to provide any additional information about this low density project: Low -Density Portion of this project: Swale 1 = Ditch-2, reference plan sheet C2.1 High - Density Portion of this project: Swale 2 = Ditch-1A, Swale 3 = Ditch-1 B, Swale 4 = Ditch-1C, reference plan sheet C2.1 SCS method was used for the following calculations �® r •r � :r rr �r � rr � r SAND FILTER 1 I Drainage area number DA-SF �2 Minimum re wired treatment volume cu ft 13059 st FRIG ERAL MDE FROM 002H .1050 3 Is the SCM sized to treat the SW from all surfaces at build -out? Yes 4 Is the SCM located away from contamfnated soils? Yes 5 What are the side slopes of the SCM (H:V)? 2:1 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 9 What is the method for dewatering the SCM for maintenance? 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)? Yes 13 It the SCM is on a single family lot, does (will?) the plat comply with General MDC 10 ? NIA 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 161 Does the SCM follow the device specific MOC? Yes 17 1 Was the SCM designed by an NC licensedprofessional? Yes SAND FILTER MDC FP.QM QZH.1056 18 SHWT elevation (fmso 2046.5 ft 19 Type of sand filter (open or closed O en 20 If dosed, will the filter will be pre -cast or pour -in -place? 21 If dosed, top of grate elevation (fmsl) N/A 22 Is this sand filler designed to attenuate peak flows? No ISedlment Chamber 23 Volume that can be retained in the sediment chamber (cubic feet) 5379 cf 24 Will there be a permanent pool in the sediment chamber? No 25 Bottom of the sediment chamber fmsl 2058.50 26 Area of the sediment chamber (square feet 1823 sf 27 Physical depth of the sediment chamber (inches) 12 in 28 Ponding depth in the sediment chamber, above any permanent pool (inches 36 in 29 Flevation of top of weir between chambers fmsi 2059.5 ISand Chamber 30 Volume that can be retained in the sand chamber cubic feet) 8057 cf 31 Bottomof the sand chamber (fmsQ 2059.50 32 Area of the sand chamber(square feet)_1623 sf 33 Physical depth of the sand chamber inches 18 in 34 Ponding depth in the sand chamber, above the sand surface (inches) 36 In 35 Elevation of the bypass device (fmsl 2062.5 36 Type of bypass device Inlet 37 Mechanism for distributing now over the sand surface Level Weir 38 Sand_specifiGatlon for sand chamber ASTM C-33 39 Depth above underdrain pipe (inches) 18 in 40 Will the media be maintained to drain at least two inches per hour at the sand surface? Yes 41 Is at least one dean-oul pipe provided at the low point of each underdrain line? Yes 42 Will clean -out piE2s becapped? ADDITIONAL INFORMATION 43 Please use this space to provide any additiional Information about the sand filler(s): Yes