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Home My WebLink About2018-1259v4_Rivercross - Updated SuppEZ_2023.09.11SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name 2 Proiect Area (ac) 4 ISurface Water Area Rivercross 73.89 1.52 1 6 1 Does this proiect use an off -site SCM? I No I COMPLIANCE WITH 02H .1003(4) 7 Width of vegetated setbacks provided feet 50 8 Will the ve etated 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 S stem 0 12 Bioretention Cell 0 13 Wet Pond 0 14 Stormwater Wetland 0 15 Permeable Pavement 0 16 Sand Filter 6 17 Rainwater Harvesting RWH 0 18 Green Roof 0 19 Level Spreader -Filter Strip LS-FS 0 20 Disconnected Impervious Surface (DIS) 0 21 Treatment Swale 0 22 1 Dry Pond 6 23 StormFilter 0 24 Silva Cell 0 25 Bayfilter 3 26 Filterra 0 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Brian Smith, PE 28 Organization: Urban Design Partners, LLC 29 Street address: 1213 W Morehead St, Suite 450 30 City, State, Zip: Charlotte, NC 28208 31 Phone numbers : 704-334-3303 32 Email: brian@urbandesignpartners.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. ��\N CAROZ'',, �OQOFEsS/6-..` 1, SEAL - 027890 tiD. Sod ill 100\ Seal 4r, � �,� •esigner Date 09.14.2023 SAND FILTER 1 Draina a area number 1 2 3 4 7 9 2 Minimum re uired treatment volume cu ft 2565 cf 4955 cf 5124 cf 10709 cf 14136 cf 17428 cf GENERAL MDC FROM 02H .1050 3 Is the SCM sized to treat the SW from all surfaces at build -out? Yes Yes Yes Yes Yes Yes 4 Is the SCM located away from contaminated soils? 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 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No No Yes No Yes Yes 7 Are the inlets, outlets, and receiving stream protected from erosion 10- ear storm)? Yes Yes Yes Yes Yes Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes Yes Yes Yes Yes Yes 9 What is the method for dewatering the SCM for maintenance? Pump referred Pump referred Pump referred Pump referred Pump referred Pump referred 10 If applicable, will the SCM be cleaned out after construction? Yes Yes Yes Yes Yes Yes 11 Does the maintenance access comply with General MDC (8)? Yes Yes Yes Yes Yes Yes 12 Does the drainage easement comply with General MDC (9)? Yes Yes Yes Yes Yes Yes 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC 10 ? Yes Yes Yes Yes Yes Yes 14 Is there an O&M Agreement that complies with General MDC (11)? 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 16 Does the SCM follow the device specific MDC? Yes Yes Yes Yes Yes Yes 17 Was the SCM designed by an NC licensedprofessional? Yes Yes Yes Yes Yes Yes SAND FILTER MDC FROM 02H .1056 18 SHWT elevation (fmsl) TBD TBD TBD TBD TBD TBD 19 Type of sand filter open or closed Open Open Open Open Open Open 20 If closed, will the filter will be re -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 I Sediment Chamber 23 Volume that can be retained in the sediment chamber (cubic feet) 3327 cf 4988 cf 5156 cf 12337 cf 7663 cf 24013 cf 24 Will there be a permanent pool in the sediment chamber? No No No No No No 25 Bottom of the sediment chamber fmsl 761.00 753.00 746.00 748.00 739.00 733.00 26 Area of the sediment chamber (square feet) 1700 sf 3119 sf 3305 sf 5296 sf 27 Physical depth of the sediment chamber inches 36 in 24 in 24 in 36 in 36 in 36 in 28 Ponding depth in the sediment chamber, above any permanent pool (inches) 26 in 24 in 27 in 27 in 27 in 27 in 291 Elevation of top of weir between chambers (fmsl) 764 755 748 751 744 738 I Sand Chamber 30 Volume that can be retained in the sand chamber cubic feet 3471 cf 4638 cf 5061 cf 11535 cf 9649 cf 26856 cf 31 Bottom of the sand chamber (fmsl) 760.50 752.00 745.50 747.50 738.62 733.00 32 Area of the sand chamber square feet 264 sf 518 sf 525 sf 1105 sf 1260 sf 2500 sf 33 Physical depth of the sand chamber inches 66 in 60 in 54 in 66 in 89 in 260 in 34 Ponding depth in the sand chamber, above the sand surface 32 in 36 in 33 in 33 in 46 in 65 in inches 35 Elevation of the bypass device fmsl 765.15 756.5 749.5 752.5 742.49 738.4 36 Type of bypass device Outlet Control Outlet Control Spillway Spillway Outlet Control Outlet Control Structure Structure Structure Structure Slope bottom of Slope bottom of Slope bottom of Slope bottom of Slope bottom of Slope bottom of 37 Mechanism for distributing flow over the sand surface pond towards sand pond towards sand pond towards sand pond towards sand pond towards sand pond towards sand bed bed bed bed bed bed 38 Sand specification for sand chamber Clean washed Clean washed Clean washed Clean washed Clean washed Clean washed concrete sand concrete sand concrete sand concrete sand concrete sand concrete sand 39 Depth above underdrain pipe inches 21 in 21 in 21 in 21 in 21 in 21 in 40 Will the media be maintained to drain at least two inches per hour at 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 underdrain line? 42 Will clean -out Likes, be ca ed? Yes Yes Yes Yes Yes Yes ADDITIONAL INFORMTON 43 Please use this space to provide any additional information about the sand filter(s): Stormwater control measures #1-4, 7, and 9 are combined sand Filter dry detention ponds with outlet control structures DRY POND 2 1 Minimum required treatment volume (cu ft) 2565 sf 49 5 sf 5124 sf I 10709 sf I 14136 cf 17428 cf GENERAL MDC FROM 021-1.1050 3 Is the SCM sized to treat the SW from all surfaces at build -out? Yes Yes Yes Yes Yes Yes 4 Is the SCM located away from contaminated soils? 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 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No No Yes No Yes Yes 7 Are the inlets, outlets, and receiving stream protected from erosion 10- ear storm)? Yes Yes Yes Yes Yes Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes Yes Yes Yes Yes Yes 9 What is the method for dewatering the SCM for maintenance? Pump preferred Pump preferred Pump (preferred) Pump preferred Pump preferred Pump (preferred) 10 If applicable, will the SCM be cleaned out after construction? Yes Yes Yes Yes Yes Yes 11 Does the maintenance access comply with General MDC 8 ? Yes Yes Yes Yes Yes Yes 12 Does the drainage easement comply with General MDC (9)? Yes Yes Yes Yes Yes Yes 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC 10 ? Yes Yes Yes Yes Yes Yes 14 Is there an O&M Agreement that complies with General MDC (11)? 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 16 Does the SCM follow the device specific MDC? Yes Yes Yes Yes Yes Yes 17 Was the SCM designed by an NC licensedprofessional? Yes Yes Yes Yes Yes Yes DRY POND MDC FROM 02H .1062 18 SHWT elevation (fmsl) TBD TBD TBD TBD TBD TBD 19 Elevation of the bottom of the dry pond (fmsl) 760.5 752 745.5 747.5 738.62 733.00 20 Distance from bottom to SHWT (feet) TBD TBD TBD TBD TBD TBD 21 Elevation of the temporary pool during the design storm (feet) 762.21 ft 753.77 ft 746.94 ft 749.24 ft 741.24 ft 733.99 ft 22 Ponding depth of the design storm (feet) 1.71 ft 1.77 ft 1.44 ft 1.74 ft 2.62 ft .99 ft 23 Will the dry pond be uniformly graded to flow toward the outlet? Yes Yes Yes Yes Yes Yes 24 Is a low flow channel being provided? No No No No No No 25 Are the inlet(s) and outlet located in a manner that avoids short- circuiting? Yes Yes Yes Yes Yes Yes 26 Will berms or baffles be provided to increase the flow path? Yes Yes Yes Yes Yes Yes 27 What method of pretreatment will be provided? Forebay Forebay Forebay Forebay Forebay Forebay 28 Design volume of SCM cu ft 6798 cf 9626 cf 10217 cf 23872 cf 17312 cf 50869 cf 29 Diameter of drawdown orifice (in) - - - - - - 30 Drawdown time for the temporary pool (hours) 51 hr 60 hr 69 hr 69 hr 79 hr 76 hr 31 Does the pond minimize impacts to the receiving channel from the 1- r, 24-hr storm? Yes Yes Yes Yes Yes Yes 32 Is there a small permanent pool near the orifice to prevent clogging? No No No No No Yes 33 Will the outlet be designed to prevent clogging? Yes Yes Yes Yes Yes Yes 34 Are the dam and embankment planted in non -clumping turf grass? Yes Yes Yes Yes Yes Yes 35 Species of turf that will be used on the dam and embankment Centipede Grass Centipede Grass Centipede Grass Centipede Grass Centipede Grass Centipede Grass 36 Will trees and shrubs be prevented from growing on the dam and embankment? Yes Yes Yes Yes Yes Yes ADDITIONAL INFORMATION 37 Please use this space to provide any additional information about the BAYFILTER 1 I Drainage area number 5 6 8 21 Minimum required treatment volume cu ft 2898 cf 10332 cf 10026 cf GENERAL MDC FROM 02H .1050 3 Is the SCM sized to treat the SW from all surfaces at build -out? Yes Yes Yes 4 Is the SCM located away from contaminated soils? Yes Yes Yes 5 What are the side slopes of the SCM H:V ? - 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No No No 7 Are the inlets, outlets, and receiving stream protected from erosion 10- ear storm)? Yes Yes Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes Yes Yes 9 What is the method for dewatering the SCM for maintenance? Pump preferred Pump preferred Pump preferred 10 If applicable, will the SCM be cleaned out after construction? Yes Yes Yes 11 Does the maintenance access comply with General MDC (8)? Yes Yes Yes 12 Does the drainage easement comply with General MDC (9)? Yes Yes Yes 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC 10 ? Yes Yes Yes 14 Is there an O&M Agreement that complies with General MDC (11)? Yes Yes Yes 15 Is there an O&M Plan that complies with General MDC (12)? Yes Yes Yes 161 Does the SCM follow the device specific MDC? Yes Yes Yes 17 Was the SCM designed by an NC licensedprofessional? Yes Yes Yes BAYFILTER MDC FROM THE STORMWATER DESIGN MANUAL 18 If Volume Design is used, what is the volume from the drainage area (cubic feet)? 2898 cf 10332 cf 10026 cf 19 Is an upstream detention used? Yes Yes Yes 20 Volume of the upslope detention system (cubic feet) 3004 cf 10676 cf 10220 cf 21 Percent of the design volume contained in the upslope detention system 100% 100% 100% 22 If Rate Based Sizing is used, for 1 inch or 1.5 inch (Coastal areas). Water Qualit flow rate for drainage area cfs 23 Number of cartridges 2 8 9 24 Cartridge height (inches) 34 in 22 in 22 in 25 SHWT elevation fmsl TBD TBD TBD 26 Elevation of bottom of BayFilter vault fmsl 746.5 731.3 749.6 27 Clearance from the SHWT feet TBD TBD TBD 28 BayFilter Media Flow Rate (GPM/ft2 of Media Surface) .33 gpm/sf .5 gpm/sf .5 gpm/sf 29 Does the system includes a sediment sump? No No No 30 If yes, the diameter of the sump (feet) 31 If yes, the depth of the sump (feet) 32 Time to drain the sump (hours) 33 Time to drain the BayFilter hours 27 hrs 48 hrs 48 hrs 34 Is an off-line flow splitting device used? Yes Yes Yes 35 T pe of media used EMC or GAC-metals EMC EMC EMC 36 Will maintenance be performed by Certified Maintenance Providers per instructions? Yes Yes Yes ADDITIONAL INFORMATION 37 Please use this space to provide any additional information about the BayFilter system(s): All Bayfilters are placed downstream of StormTech chamber detention system that is sized for the 1-inch water quality volume. A flow splitter manhole is placed upstream of the detention system to allow higher flow events to bypass the detention & treatment system. DRAINAGE AREAS 1 Is this a high dens! ro'ect? Yes 2 If so, number of drainage areas/SCMS 9 3 Does this ro'act have low densi areas? No 4 If so, number of low densi drainage areas 0 Is all/part of this project subject to previous rule 5 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 3 4 5 6 7 8 9 4 Type of SCM Sand Filter/Dry Pond Sand Filter/Dry Pond Sand Filter/Dry Pond Sand Filter/Dry Pond Underground Detention/Bay Filter Underground Detention/Bay Filter Sand Filter/Dry Pond Underground Detention/Bay Filter Sand Filter/Dry Pond 5 Total drainage area (sq fl 1258894 sf 31675 sf 81390 sf 83520 sf 171315 sf 46855 sf 169835 sf 229430 sf 162141 sf 282733 sf 6 Onsite drainage area (sq ft 641721 sf 15130 sf 36415 sf 35055 sf 99280 sf 32530 sf 72650 sf 117140 sf 83866 sf 149655 sf 7 Offsite drainage area (sq ft 617173 sf 16545 sf 44975 sf 48465 sf 72035 sf 14325 sf 97185 sf 112290 sf 78275 sf 133078 sf 8 Total BUA in project (sq ft 9 New BUA on subdivided lots (subject to permitting) (sq ft 10permitting) New BUA not on subdivided lots (subject to sf 11 Offsite BUA s ft 12 Breakdown of new BUA not on subdivided lots: - Parking (sq ft 3000 sf 3000 sf - Sidevialk (sq ft 255758 sf 2035 sf 20075 sf 19850 sf 33680 sf 8350 sf 42390 sf 42650 sf 30340 sf 56388 sf - Roof (sq ft 7000 sf 7000 sf - Roadway (s ft 346415 sf 14510 sf 24900 sf 28615 sf 38355 sf 5975 sf 54795 sf 54640 sf 47935 sf 76690 sf - Future (sq ft - Other, please specify in the comment box below (scl ft 5000 sf I I 5000 sf 13 New infiltrating permeable pavement on subdivided lots (sq ft 14 New infiltrating permeable pavement not on subdivided lots (sq ft 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 53% 13% 67% 61% 50% 56% 68% 58% 56% 58% 19 Design storm inches 1 in 1 in 1 in 1 in 1 in 1 in 1 in 1 in 1 in 1 in ofSvolu20De CM cu ft 2565 cf 4955 cf 5124 cf 10709 cf 2898 cf 10332 cf 14136 cf 10026 cf 17428 cfe 21 Calclaion m utmeod Sm Simple Simple Simple Sim le ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): Parking, roof & other impervious in basin 7 accounts for amenity area