The URL can be used to link to this page

Home My WebLink AboutSW3230801_Supplement-EZ Form_20230810 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name Conservancy at Waxhaw Phase 3 2 Project Area (ac) 74.35 3 Coastal Wetland Area (ac) 0 4 Surface Water Area (ac) 0.09 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) 100 for Streams (200'for Waxhaw Creek) 8 Will the vegetated setback remain vegetated? Yes 9 If BUA is proposed in the setback, does it meet NCAC 02H.1003(4)(c-d)? Yes 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 12 Bioretention Cell 13 Wet Pond 14 Stormwater Wetland 15 Permeable Pavement 16 Sand Filter 9 17 Rainwater Harvesting (RWH) _ 18 Green Roof 19 Level Spreader-Filter Strip (LS-FS) 20 Disconnected Impervious Surface (DIS) 21 Treatment Swale 22 Dry Pond 23 StormFilter 24 Silva Cell __ 25 Bayfilter 26 Filterra FORMS LOADED • DESIGNER CERTIFICATION 27 Name and Title: James P. Magennis, President 28 Organization: Construction Materials Engineering &Consulting PC 29 Street address: PO Box 348 30 City, State, Zip: Mt. Holly, NC 28120 31 Phone number(s): 704-361-8104 32 Email: jim@cmecpc.net 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 ,#, % $1111ev/11 `�%s Q�•I % CA/ �',g .0 + • fess, % -r- -, ..„4.,",. ..„..„4. de: ( ' SEAL r 1 % Sig ure of Designer t 24896 1 s I Seal Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so,number of drainage areas/SCMs 9 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 I FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 2 4 5 6 7 8 9 4 Type of SCM Sand Filter Sand Filter Sand Filter Sand Filter Sand Filter Sand Filter Sand Filter Sand Filter Sand Filter 5 Total drainage area(sq ft) 1523451 9156E 54723 351609 570946 359297 19350 14905 30189 30864 6 Onsite drainage area(sq ft) 1523451 91568 54723 351609 570946 359297 19350 14905 30189 30864 7 Offsite drainage area(sq ft) 6 Total BUA in project(sq ft) 326220 18699 sf 13889 sf 73770 sf 117129 sf 76339 sf 4844 sf 4750 sf 6983 sf 9817 sf New BUA on subdivided lots(subject to 9 permitting)(sq ft) 217339 13050 sf 8950 sf 58212 sf 83659 sf 50550 sf sf sf sf 2918 sf New BUA not on subdivided lots(subject to 10 permitting)(sf) 106297 5649 sf 4939 sf 15557 sf 33470 sf 23206 sf 4844 sf 4750 sf 6983 sf 6899 sf 11 Offsite BUA(sq ft) 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) 3048 3048 sf -Sidewalk(sq ft) -Roof(sq ft) -Roadway(sq ft) 105828 5645 sf 4939 sf 15557 sf 33470 sf 22741 sf 4844 sf 4750 sf 6983 sf 6899 sf -Future(sq ft) -Other,please specify in the comment box below(sq ft) New infiltrating permeable pavement on 13 subdivided lots(sq ft) N/A New infiltrating permeable pavement not on 14 subdivided lots(sq ft) N/A Existing BUA that will remain(not subject to 15 permitting)(sq ft) N/A 16 Existing BUA that is already permitted(sq ft) N/A 17 Existing BUA that will be removed(sq ft) N/A 18 Percent BUA 21% 20% 25% 21% 21% 21% 25% 32% 23% 32% 19 Design storm(inches) _ 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in 20 Design volume of SCM(cu ft) 1786 cf 1274 cf 6986 cf 11037 cf 7215 of 439 cf 421 of 648 cf 880 cf 21 Calculation method for design volume Schueler Method ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): Drain areas 6-9 are for the treatment of roadway water where flow could not get into the Sand Filters 1-5.These are small filters within the roadside ditch for treatment before leaving the site. SAND FILTER 1 Drainage area number 1 2 3 4 5 6 7 8 9 2 Minimum required treatment volume(cu ft) 1786 sf 1274 sf 6986 sf 11037 sf 7215 sf 439 sf 421 sf 648 sf 880 sf kENERAL MDC FROM 02H.1050 .11 3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes Yes Yes Yes Yes Yes Yes Yes 4 Is the SCM located away from contaminated soils? Yes Yes Yes Yes Yes Yes Yes Yes Yes 5 What are the side slopes of the SCM(H:V)? 3:1 3:1 3:1 3:1 3:1 3:1 3:1 3:1 3:1 6 Does the SCM have retaining walls,gabion walls or other engineered No No No No No No No No No side slopes? 7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes Yes Yes Yes Yes Yes Yes Yes (10-year storm)? 6 Is there an overflow or bypass for inflow volume in excess of the Yes Yes Yes Yes Yes Yes Yes Yes Yes design volume? 9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice Drawdown Orifice Drawdown Orifice Drawdown Orifice Drawdown Orifice Drawdown Orifice Drawdown Orifice Drawdown Orifice Drawdown Orifice 10 If applicable,will the SCM be cleaned out after construction? Yes Yes Yes Yes Yes Yes Yes Yes Yes 11 Does the maintenance access comply with General MDC(8)? Yes Yes Yes Yes Yes Yes Yes Yes Yes 12 Does the drainage easement comply with General MDC(9)? 13 If the SCM is on a single family lot,does(will?)the plat comply with N/A N/A N/A N/A N/A N/A N/A N/A N/A General MDC(lop 14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes Yes Yes Yes Yes Yes Yes Yes 15 Is there an O&M Plan that complies with General MDC(12)? Yes Yes Yes Yes Yes Yes Yes Yes Yes 16 Does the SCM follow the device specific MDC? Yes Yes Yes Yes Yes Yes Yes Yes Yes 17,Was the SCM designed by an NC licensed professional? Yes Yes Yes Yes Yes Yes Yes Yes Yes SAND FILTER MDC FROM 02H.1056 18 SHWT elevation(fmsl) Rock Rock 545 Rock 521.05 561 561 575 575 19 Type of sand filter(open or closed) Open Open Open Open Open Open Open Open 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 Yes Yes Yes Yes Yes Yes Yes Yes Sediment Chamber 23 Volume that can be retained in the sediment chamber(cubic feet) 357 cf 255 cf 1397 cf 2207 cf 1443 cf 88 cf 84 cf 130 cf 176 cf 24 Will there be a permanent pool in the sediment chamber? Yes Yes Yes Yes Yes Yes Yes Yes Yes 25 Bottom of the sediment chamber(fmsl) 587.00 588.00 554.00 553.00 534.00 588.00 588.00 581.00 581.00 26 Area of the sediment chamber(square feet) 1105 sf 757 sf 3658 sf 10358 sf 11261 sf 513 sf 381 sf 839 sf 821 sf 27 Physical depth of the sediment chamber(inches) 24 in 24 in 24 in 24 in 24 in 12 in 12 in 12 in 12 in 28 Ponding depth in the sediment chamber,above any permanent pool in in in in in in in in in (inches) 29 Elevation of top of weir between chambers(fmsl) 589 590 556 555 536 589 589 582 582 Sand Chamber 30 Volume that can be retained in the sand chamber(cubic feet) 500 cf 630 of 2000 cf 3125 cf 2250 cf 120 cf 120 cf 240 cf 240 cf 31 Bottom of the sand chamber(fmsl) 585.00 585.00 550.25 549.25 530.25 585.50 585.50 578.50 578.50 32 Area of the sand chamber(square feet) 250 sf 252 sf 800 sf 1250 sf 900 sf 60 sf 60 sf 120 sf 120 sf 33 Physical depth of the sand chamber(inches) 24 in 30 in 30 in 30 in 30 in 24 in 24 in 24 in 24 in 34 Ponding depth in the sand chamber,above the sand surface 7 in 9 in 17 in 18 in 15 in 12 in 13 in 15 in 16 in (inches) 35 Elevation of the bypass device(fins!) 588.5 588.75 554 553.5 534 588.55 588.6 581.75 581.85 36 Type of bypass device Orifice-OCS Orifice-OCS Orifice-OCS Orifice-OCS Orifice-OCS Drop Inlet Top Drop Inlet Top Drop Inlet Top Drop Inlet Top 37 Mechanism for distributing flow over the sand surface Riprap Berm Riprap Berm Riprap Berm Riprap Berm Riprap Berm Riprap Berm Riprap Berm Riprap Berm Riprap Berm 38 Sand specification for sand chamber Concrete Concrete Concrete Concrete Concrete Concrete Concrete Concrete Concrete 39 Depth above underdrain pipe(inches) 24 in 30 in 30 in 30 in 30 in 24 in 24 in 24 in 24 in 40 Will the media be maintained to drain at least two inches per hour at Yes Yes Yes Yes Yes Yes Yes Yes Yes the sand surface? 41 Is at least one clean-out pipe provided at the low point of each Yes Yes Yes Yes Yes Yes Yes Yes Yes underdrain line? 42 Will clean-out pipes be capped? Yes Yes Yes Yes Yes Yes Yes Yes Yes ADDITIONAL INFORMATION 43 Please use this space to provide any additional information about the sand filter(s): Sand Filter 1 7:59 PM 7/13/2023