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Home My WebLink AboutSWA000227_Supplement-EZ Form_20230919 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name _ Waxhaw Volunteer Fire Department 2 Project Area(ac) - _ 4 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 COMPLIANCE WITH 02H.1003(4) 7 Width of vegetated setbacks provided(feet) N/A 8 Will the vegetated setback remain vegetated? N/A 9 If BUA is proposed in the setback,does it meet NCAC 02H•1003(4c21)? N/A 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System _ 0 12 Bioretention Cell _ 0 _ 13 Wet Pond 0 14 Stormwater Wetland 0 15 Permeable'Pavement 0 16 Sand Filter 1 17 Rainwater Harvesting(RWH) 0 18 GreenRoof 0 19 Level Spreader-Filter Strip(LS-FS) 0 20 Disconnected Impervious Surface(DIS) 0 21 Treatment Swale 0 22 Dry Pond 1 23 StormFllter 0 24 Silva Cell 0 25 Bayfilter 0 26 Filterra 0 FORMS LOADED DESIGNER CERTIFICATION _ 27 Name and Title: - Brad Smith,PE,PMP 28 Organization: Timmons Group 29 Street address: 610 E Morehead St,Suite 250 30 CiLState,Zip: Charlotte,NC 28202 31 phone numbers: 704-376-1079 32 Email: brad.smith@limmons.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 0 =2 9 • aSEAL <• Si store of Designer 48704 ` B/1.0y3 • e/ IN�• g\�� M�BRAO'-\ e/t01 Seal Date DRAINAGE AREAS • I Is this a high density project? Yes 2 If so,number of drainage areas/SCMs 1 3 Does this project have low density areas? No 4 If so,number of low density drainage areas 0 Is all/part of this project subject to previous rule 5 versions? No FORMS LOADED 'DRAINAGE AREA INFORMATION Entire Site 1 sand filter/dry sand filter/dry 4 Type of SCM pond pond 5 Total drainage area(sq ft) 189486 101930 6 Onsite drainage area(sq ft) 126056 101685 7 Offsite drainage area.(sq ft) 63430 245 8 Total BUA in project(sq ft) 49361 sf 49361 sf _ New BUA on subdivided lots(subject to 9 ermitting)(sq ft)_ - - New BUA not on subdivided lots(subject to 10 permitting)(sf) 49361 sf 49361 sf 11 Offsite BUA(sq ft) - - 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) 30851 sf 30851 sf -Sidewalk(sq ft) 2860 sf 2860 sf -Roof(sue 10326 sf 10326 sf -Roadway(sq ft) - - -Future(sq ft)- 5324 sf 5324 sf -Other,please specify in the comment box below(sq ft) - - New infiltrating permeable pavement on 13 subdivided lots(sq ft) - - New infiltrating permeable pavement not on 14 subdivided lots(sq ft) - - Existing BUA that will remain(not subject to 15 permitting)(sq ft) - - 16 Existing BUA that is already permitted(sq ft) - - _ _ 17 Existing BUA that will be removed(sq ft) - - 18 Percent BUA sf 28% 19 Design storm(inches) _ 5.2 in 20 Design volume of SCM(cu ft) 38271 sf 38271 cf 21 Calculation method for design volume Prismatic Prismatic ADDITIONAL INFORMATION _ Please use this space to provide any additional information about the 22 drainage area(s): SAND FILTER 1 Drainage area number _ 1 2'Minimum required treatment volume(cu ft) 3087 sf FENERWIQG FAQM DOH ' 311s the SCM sized to treat the SW from all surfaces at build-out? *ea 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 No side slopes? 7 Are the inlets,outlets,and receiving stream protected from erosion Yes (10-year storm)? 8 Is there an overflow or bypass for inflow volume in excess of the Yes design volume? 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 If the SCM is on a single family lot,does(will?)the plat comply with N/A 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 Does the SCM follow the device specific MDC? Yes 17 Was the.SCM designed by an NC licensed professional? Yes W0 FILTERMDC FROM 0_2H:4O 181SHWT elevation(fmsl) >10'below ex 19 Type of sand filter(open or closed) Open 20 If closed,will the filter will be pre-cast or pour-in-place? _ 21 If closed,top of grate elevation(fmsl) _ _ 22 Is this sand filter designed to attenuate peak flows? Yes Sediment Chamber 23 Volume that can be retained in the sediment chamber(cubic feet) 38271 cf 24 Will there be a permanent pool in the sediment chamber? No 25 Bottom of the sediment chamber(fmsl) 577.00 26 Area of the sediment chamber(square feet) 9490 sf 27 Physical depth of the sediment chamber(inches) 72 in 28 Ponding depth in the sediment chamber,above any permanent pool N/A (mom`) 29'Elevation of top of weir between chambers(fmsl) 579 Sand Chamber 30 Volume that can be retained in the sand chamber(cubic feet) 788 cf 31 Bottom of the sand chamber(fmsU 575.50 32 Area of the sand chamber(square feet) 525 sf 33 Physical depth of the sand chamber(Inches) 18 in 34 Ponding depth in the sand chamber,above the sand surface 60 in (incites) 35 Elevation of the bypass device(fmsl) 577.67 36 Type of bypass device ORIFICE 37 Mechanism for distributing flow over the sand surface FLOW 38 Sand specification for sand chamber ASTM C-33 39 Depth above underdrain pipe(inches) 12 in 40 Will the media be maintained to drain at least two inches per hour at Yes the sand surface? Is at least one clean-out pipe provided at the low point of each 41 underdrain line? Yes 42 Will clean-out pipes be capped? Yes ADDITIONAL INFORMATION 43 Please use this space to provide any additional Information about the sand Iilter(s)_ 2 DRY POND 1 Drainage area number 1 2 Minimum required treatment volume(cu ft) 4118 ci GENERAL 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 Does the SCM have retaining walls,gabion walls or other 6 engineered side slopes? No Are the inlets,outlets,and receiving stream protected from erosion 7(10-year storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the Yes design volume? 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 If the SCM is on a single family lot,does(will?)the plat comply with N/A 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 Does the SCM follow the device specific MDC? Yes 17 Was the SCM designed by an NC licensed professional? Yes DRY POND MDC FROM OVUM 18 SHWT elevation(fmsl) - 19 Elevation of the bottom of the dry pond(fmsl)_ 577 20 Distance from bottom to SHWT(feet) - 21 Elevation of the temporary pool during the design storm(feet) 581 ft 22 Ponding depth of the design storm(feet) 4 ft 23 Will the dry pond be uniformly graded to flow toward the outlet? Yes 24 Is a low flow channel being provided? No • Are the inlet(s)and outlet located in a manner that avoids short- 25 circuiting? Yes 26 Will berms or baffles be provided to increase the flow path? Yes 27 What method of pretreatment will be provided? SAND FILTER 28 Design volume of SCM(Cu ft) 38271 29 Diameter of drawdown orifice(in) 1.2 in 30 Drawdown time for the temporary pool(hours) 65 Does the pond minimize impacts to the receiving channel from the 1- 31 Yes yr,24-hr storm? 32 Is there a small permanent pool near the orifice to prevent clogging? No 33 Will the outlet be designed to prevent clogging? Yes 34 Are the dam and embankment planted in non-clumping turf grass? Yes 35 Species of turf that will be used on the dam and embankment TALL FESCUE Will trees and shrubs be prevented from growing on the dam and 36 embankment? Yes ADDITIONAL INFORMATION 37 Please use this space to provide any additional information about the dry pond(s): 2