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Home My WebLink AboutSW3170802_Supplement-EZ Form_20170802SUPPLEMENT -EZ FORM COVER PAGE 11 Please indicate the types, quantities and locations of SCMs that will be used on this project: Quantity Infiltration System T Location(s) Bioretention Cell The Isaacs Group, PC Wet Pond 1 8720 Red Oak Blvd. Stormwater Wetland Charlotte, NC 28217 Permeable Pavement (704)227-9402 Sand Filter 1 bcowan@isaacsfrp.com Rainwater Harvesting _ Green Roof Level Spreader -Filter Strip _ Disconnected Impervious Surface Treatment Swale Dry Pond Designer information for this project: Name and Title Anthony Brent Cowan, P E. • Organization: The Isaacs Group, PC Street address: 8720 Red Oak Blvd. City, State, Zip: Charlotte, NC 28217 Phone number(s): (704)227-9402 Email bcowan@isaacsfrp.com Designer eepe1E699B��o� "B 0 'Y'•�QROFESS'/0 ;�/ o Amo r ® r• - m ® �/NEER v � a� �. s® � ��13. CO% %�, �� IR."'pa�eoa Sealt A�� Signature of D igner 6�L311 R Date Applicant: - Cnnranmrn Quant, Project Name: Weddington-Matthews Road Subd. Address Weddington-Matthews Road City / Town Weddington Company JBH Development, LLC Contact: J.•Bart Hopper, Mailing Address: 229 East Kingston Ave. _ City, State, Zip. Charlotte, NC 28203' Phone number(s): (704) 805-4802 Email bhopper@hoppercomImunities.com' Certification Statement- ] 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 I am aware that there are significant penalties for submitting false information including the possibility of fines and imprisonment for knowing violations as well as a report being made to my professional board t'10 02 2'u17 DENR-LAND QUALITY STORMWATER PERMITTING Cover Page 1 2 10 PM 7/6/2017 SAND FILTER weddington THE DRAINAGE AREA� Drainage area number 1 Break down of BUA in the drainage area (both new and existing): Total coastal wetlands area (sq ft) Parking / driveway (sq ft) 5750 sf Total surface water area (sq ft) Sidewalk (sq ft) 6250 sf Total drainage area (sq ft) 360677 sf Roof (sq ft) 69000 sf BUA associated with existing development (sq ft) Roadway (sq ft) _ 32500 sf _ Proposed new BUA (sq ft) 113692 sf Other, please specify in the comment box below (sq ft) _ _ Percent BUA of drainage area 31% ITotal BUA (sq ft)113500 sf COMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAMS _ Sto_rmw_ater program(s) that apply (please specify) Design rainfall depth (in) 2 8 in - ' Minimum volume required (cu ft) 14008 cf Design volume of SCM (cu ft) 14008 cf GENERAL MDC FROM 02H.1050 #1 Is the SCM sized to treat the SW from all surfaces at build -out? Yes #7 If applicable, with the SCM be cleaned out after construction Yes #2 Is the SCM located on or near contaminated soils? No #8 Does the mainetenance access comply with General MDC (8)? Yes #3 What are the side slopes of the SCM (H V)? 31 #9 Does the drainage easement comply with General MDC (9)? Yes #3 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No #10 If the SCM is on a single family lot, does the plat comply with General MDC (10)? _ #4 Are the inlets, outlets, and receiving stream protected from erosion (10 -year storm)? Yes #11 Is there an O&M Agreement that complies with General MDC (11)? #5 Is there a a bypass for flows in excess of the design flow? No 412 Is there an O&M Plan that complies with General MDC (12)? #6 What is the method for dewatering the SCM for maintenance? Drawdown Onfice #13 Was the SCM designed by an NC licensed professional? Yess_�� SAND FILTER MDC FROM 02H.1056 #1 SHWT elevation (fmsl) #3 Volume of stormwater from drainage area during design storm (cubic feet) 14008 cf #1 Type of sand filter (open or closed) Olsen #3 Total volume that can be stored above the sediment and sand chambers (cubic feet) 23886 cf #1 If closed, describe if the filter will be pre -cast or pour -in-place #3 Is this sand filter designed to attenuate peak flaws? Yes _ #3 Elevation of the bypass device (fmsl) _ #1 If closed, top of grate elevation (fmsl) #3 Describe the bypass device #2 Volume that can be retained in the sediment chamber (cubic feet) _ , #2 Will there be a permanent pool in the sediment chamber? #2 Bottom of the sediment chamber (fmsl) #4 Ponding depth from the top of the sand to the bypass device (ft) #2 Area of the sediment chamber (square feet) #5 Describe the mechanism for distributing flow over the sand surface _ #2 Physical depth of the sediment chamber (inches) T #2 Ponding depth in the sediment chamber, above any permanent pool (inches) #6 Sand specification for sand chamber #2 Elevation of tap of weir between chambers (fmsl) _ _ _ #2 Volume that can be retained in the sand chamber (cubic feet) #2 Bottom of the sand chamber (fmsl) 694 It #7 Depth above underdrain pipe (inches) 18 in #2 Area of the sand chamber (square feet) 1497 sf #8 Will the media be maintained to drain at least two inches per hour at the sand surface? Yes #2 Physical depth of the sand chamber (inches) _ 18 in #9 Is at least one cleanout pipe provided at the low point of each underdrain line? Yes #2 Ponding depth in the sand chamber, above any permanent pool (inches) #9 Will cleanout pipes be capped? Yes ADDITIONAL INFORMATION Please use this space to provide any additional information about this sand filter that you think is relevant to the review Sand Filter 1 1:32 PM 7/6/2017 WETPOND Weddington 'THE DRAINAGE AREA __ _ Drainage area number 2_—down of BUA in the drainage area (both new and existing). - - Total coastal wetlands area (sq ft) -- -11Break ;, - Parking / driveway (sq ft) 11750 sf y 9950 sf 141000 sf 4 51740 sf Total surface water area (sq ft) .alk (sq ft) Total drainage area (sq ft) 728758 sf - Roof (sq ft) BUA associated with existing development (sq ft) R - Roadway (sq ft) Proposed new BUA (sq ft) 214440 sf Other, please specify in the comment box below (sq ft) Percent BUA of drainage area 29% Total BUA (sq ft) _- �_--� T -- - 214440 sf- COMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAM _ - Storm_water program(s) that apply (please specify) Design rainfall depth (in) 2 8 in f IMinimum volume required (cu ft) 31898 cf i Design? volume of SCM (cu ft) 31898 cf eofS- - - - -- ---- -- --- --- - - - - --- - - - I'GENERAL MDC FROM 07H.1050 - #1 Is the SCM sized to treat the SW from all surfaces at build -out? _ 1#7 If applicable, with the SCM be cleaned out after construction -- Yes Yes --Yes __-, --Yes #2 Is the SCM located on or near contaminated soils? No 1I#8 Does the mainetenance access comply with General MDC (8)? - #3 What are the side slopes of the SCM (H V)? 3 1 _�#9 Does the drainage easement comply with General MDC (9)? #3 Does the SCM have retaining walls, gabion walls or other engineered side slopes No ;i#10 If the SCM is on a single family lot, does the plat comply with General MDC (10)? #4 Are the inlets, outlets, and receiving stream protected from erosion (10 -year storm)? —_Yes_ 1611 Is there an O&M Agreement that complies with General MDC (11)? #5 Is there a a bypass for flows in excess of the design flow? I No #12 Is there an O&M Plan that complies with General MDC (12)? #6 What is the method for dewaten_ng the SCM for maintenance? Drawdown Orifice 1#13 Was the SCM designed by an NC licensed professional? Yes J WET POND MDC FROM 02H .1053 _ #1 Method used SA/DA #6 Width of the vegetated shelf (feet) t loft ___ - J #1 Surface area of the main permanent pool (square feet) - -_ 25270 sf #6 Location of vegetated shelf —j#6 Submerged ____ 690 ft - 689 ft _ _ _ _ ___ j 101 4 0 in j - 110 hrs #1 Volume of the main permanent pool (cubic feet) 72018 cf Elevation of top of shelf (fmsl) �#2 Average depth of the main pool (feet) _ _ - 4 ft 1#6 Elevation of bottom of shelf (fmsl) #2 Was the vegetated shelf included in the calculation of average depth? _ Y_es4#6 Slope of vegetated shelf (H V) 689 It '1#7 Diameter of drawdown orifice (inches) #2 Elevation of the bottom of the permanent pool (fmsl) i #2 Elevation of the top of the permanent pool (fmsl) 690 ft ;#7 Drawdown time for the temporary pool (hours) #2 Elevation of the top of the temporary pool (fmsl)691 ft #7 Does the orifice drawdown from below the top surface of the permanent pools No y -- Yes —� No #3 Depth provided for sediment storage (inches) - 12 in- 1#8 Does the pond minimize impacts to the receiving channel from the 1 -yr, 24 -hr stormy #4 Are the inlet(s) and outlet located in a manner that avoids short-circuiting? Yes #9 Are fountains proposed? #4 Describe any measures, such as berms or baffles, that will be taken to improve the flow path #9 If yes, is documentation provided per Wet Pond MDC (9)? - No j ' ____27237____#11 No #10 Is a trash rack or other device provided to protect the outlet system? Are the dam and embankment planted in non -clumping turf grass? `[#11 Species of turf that will be used on the dam and embankment Yes - j Yes - _ #5 Volume of the forebay (cubic feet) #5 Is this 15-20% of the volume in the main pool? #5 Depth of forebay at entrance (inches) 66 in 1#11 Describe the planting plan for the vegetated shelf t #5 Depth of forebay at exit (inches) 54 m Yes - 54 in -' Yes -- #5 Does water flow out of the forebay in a non-erosive manner? #5 Clean-out depth for forebay (inches) #5 Will the forebay_ be cleaned out when the depth is reduced to less than the above? ADDITIONAL INFORMATION Please use this space to provide any additional information about this wet pond that you think is relevant to the review T , V ' Wet Pond 1 132 PM 7/6/2017