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Home My WebLink AboutSW3190806_Supplement EZ Cover Page _9/11/2019SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name Courtyards at Emerald Lake 2 Project Area ac 32.5 3 Coastal Wetland Area ac 0 4 Surface Water Area ac 0.5 5 Is this project High or Low Density? i High 6 Does this project use an off -site SCM? No COMPLIANCE WITH 02H .1003(4) 7 Width of vegetated setbacks provided feet IC7p 8 Will the vegetated setback remain vegetated? Yes 9 Is BUA other that as listed in .1 0034 c-d out of the setback? Yes 10 Is streambank stabilization proposed on this project? No UMMERA AND TYPE OF SCMs: 11 Infiltration System 0 12 Bioretention Cell 0 13 Wet Pond 2 14 Stormwater Wetland 0 15 Permeable Pavement 0 16 Sand Filter 0 17 Rainwater Harvesting RWH 0 18 Green Roof 0 19 Level Spreader -Filter Strip (IS-FS 0 20 Disconnected Impervious Surface (DIS) 0 21 Treatment Swale 0 22 Dry Pond 0 23 StormFilter 0 24 Silva Cell ^— 0 25 Ba Ilter 0 26 Filterra 0 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Brian Rossi, PE/ Project Manager 28 Or anizati_on: EMH&T 29 Street address: 301 McCullough Dr Charlotte NC 28262 30 City, State, Zip: 31 Phone num_be_r(s): _ 704-548-0333 brossi@emht.com 32 Email: 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. ��\IIIIIIIIIN/�� SEAL = 045526 C_\�\` Signature of Designer 1?,/z-i111 DRAINAGE AREAS 1 Ils this a high density project? _ Yes 2 If so, number of drainage areas/ SCMs 2 Is all/ of this project subject to previous rule 3 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 4 Type of SCM wet pond 374014 sf _ 374014 sf wet and 5 Total BUA in project (sq ft 91130 sf 6 New BUA on subdivided lots (subject to permitting) (sq ft 91130 sf sf 7permitting) New BUA outside of subdivided lots (subject to s sf 8 Offsite - total area (sq ft sf 13939 sf 9 Offsite BUA (sq ft sf 10 Breakdown of new BUA outside subdivided lots: -Parking sq ft 4791 sf sf - Sidewalk (sq fit) 17040 sf 2912 sf - Roof (sq ft 268983 sf 74488 sf - Roadway s fit) 83200 sf 13730 sf - Futures ft sf sf - Other, please specify in the comment box below (sq ft sf sf 11 New infiltrating permeable pavement on subdivided lots (sq ft) sf sf 12 New infiltrating permeable pavement outside of subdivided lots (sq ft sf sf 13permitting) Exisitng BUA that will remain (not subject to s ft sf sf 14 Existing BUA that is already permitted (sq ft sf sf 15 Existing BUA that will be removed (sq ft sf sf 16 Percent BUA 46% 50% 17 Desi n storm (inches) 1 inch 1 inch 18 Design volume of SCM cu ft 161487 cf 68175 cf 19 Calculation method for design volume rational method rational method ADDITIONAL INFORMATION 20 Please use this space to provide any additional information about the drainage area(s): WET POND 1 Drainage area number ____?]Design volume of SCM CCMCDnI "A CDn" nlu lnC 1 1 2 31 Is the SCM sized to treat the SW from all surfaces at build -out? Yes Yes 4 Is the SCM located away from contaminated soils? Yes Yes 5 What are the side slopes of the SCM (H:V)? 3:1 3:1 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No No 7 Are the inlets, outlets, and receiving stream protected from erosion (10-year storm)? Yes Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes Yes 9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice Drawdown Orifice 10 If applicable, will the SCM be cleaned out after construction? Yes Yes 11 Does the maintenance access comply with General MDC (8)? Yes Yes 12 Does the drainage easement comply with General MDC (9)? Yes Yes 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC (10)? No No _ 14 Is there an O&M Agreement that complies with General MDC (11)? Yes Yes 15 Is there an O&M Plan that complies with General MDC (12)? Yes Yes 16 Does the SCM follow the device specific MDC? Yes Yes =POND s the SCM designed by an NC licensed professional? Yes Yes MQC FROM 02H.1053 181 Method used _ SA/DA SA/DA 19 Has aotage/sge tab torale been provided in the calculations? Yes Yes 20 Elevation of the excavated main pool depth (bottom of sediment removal) (fmsl) 627.00 632.40 21 Elevation of the main pool bottom -(top of sediment removal) (fmsl) 628.00 633.40 22 Elevation of the bottom of the vegetated shelf (fmsl) 634.00 638.80 23 Elevation of the permanent pool (fmsl) 634.50 639.28 24 Elevation of the top of the vegetated shelf (fmsl) 635.00 639.80 25 Elevation of the temporary pool (fmsl) 637.51 640.39 26 Surface area of the main permanent pool (square feet) 19267:1 8773:1 71380 cf 6.00 ft 27 Volume of the main permanent pool (cubic feet) 164773 cf 28 Average depth of the main pool (feet) 6.50 ft Equation 2 29 Average depth equation used Equation 2 30 If using equation 3, main pool perimeter (feet) 31 If using equation 3, width of submerged veg. shelf (feet) 32 Volume of the forebay (cubic feet) 21420 cf 6132 cf 33 Is this 15-20% of the volume in the main pool? Yes Yes 34 Clean -out depth for forebay (inches) 6 in 6 in 35 Design volume of SCM (cu ft) 161487 cf 68946 c1 36 Is the outlet an orifice or a weir? Orifice Orifice 37 If orifice, orifice diameter (inches) 6 in 4 in 381 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 2 2 41 Are the inlet(s) and outlet located in a manner that avoids short- circuiting? Yes Yes 42 Are berms or baffles provided to improve the Flow path? Yes Yes 43 Depth of forebay at entrance (inches) 73 in 70 in 441 Depth of forebay at exit (inches) 78 in 76 in 451 Does water flow out of the forebay in a non -erosive manner? Yes Yes 46 Width of the vegetated shelf (feet) loft loft 47 Slope of vegetated shelf (H:V) 10:1 10:1 48 Does the orifice drawdown from below the top surface of the permanent pool? Yes Yes 49 Does the pond minimize impacts to the receiving channel from the 1- yr, 24-hr storm? __ Yes Yes 50 Are fountains proposed? (If Y, please provide documentation that MDC(9) is met.) Yes Yes 51 Is a trash rack or other device provided to protect the outlet system? No No 52 Are the dam and embankment planted in non -clumping turf grass? Yes Yes 53 Species of turf that will be used on the dam and embankment Please use this space to provide any additional wet pond(s): Wet Pond 3 1:25 PM 8/27/2019