The URL can be used to link to this page

Home My WebLink AboutSW3210401_Supplement-EZ Form_20210930SUPPLEMENT-EZ COVER PAGE FORMS LOADED COMPLIANCE WITH 02H .1003(4) 7 Width of vegetated setbacks provided feet 50 8 Will the ve etated setback remain ve etated? _ Yes 9 Is BUA other that as listed in .1003(4Xc-d) out of the setback? 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System Bioretention Cell 0 0 12 13 Wet Pond -- ---- 1 ------------- 14 15 Slormwater Wetland Permeable Pavement 0 _............ ... . 0 16 17 18 Sand Filter _ Rainwater Harvestin0 (RWH) Green Roof _ 0 0 0 19 Level Spreader -Filter Stri LS-FS _ 0 20 Disconnected Impervious Surface (DIS) Treatment Swale 0 Y -- ---- -- --- ----- 0-----------_- 21 22 DiV Pond Storm Filter 0 0 23 24 1Iva Goil Bayilter "terra 0 0 0 25 26 FORMS LOADED Name and Title: Marc Momsen, P.E. w 223 North Graham Street Charlotte, NC 28202 704-333-0325 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. CAR// XX 4Q� SEAIo r� 033804 _ INE p+�M�,S VIL PP�_ Si lure signer Date DRAINAGE AREAS L3 1 Is this a high densityproject? Yog 2 If so, number of drainage areas/SCMs Is all/part of this project subject to previous rule versions? f W FORMS LOADED DRAINAGE AREA INFORMATION 9nfire Site 1 4 T e of SCM 5 Total BUA in project ft 374984 sf 469403 sf 6permitting) New BUA on subdivided lots (subject to ft New BUA outside of subdivided lots (subject to ermitting) fsfl Offsite - total area sy ft) Offsite BUA Jsgft Breakdown of new BUA outside subdivided lots: Parkin ft _ Sidewalk ft - Roofs ft Roadway s ft 360094 sf NIA NIA 41080 sf 7 360094. sf _ 94419 sf 94419 sf 41080 sf _ _ _ i 320sf _ 20860 sf 8 9 10 1320 sf 20860 sf 14712 sf 14712 sf - Future Og ft 282122 sf _ 282122 sf Other, please specify in the comment box below (sq ft 11 New infiltrating permeable pavement on subdivided lots (sq ft WA 12 13 New infiltrating permeable pavement outside of subdivided lots (sq ft) _ NIA - 14890 sf - 14890 sf_ Exisitng BUA that will remain (not subject to ermittin ft 14 Existing BUA that is already permitted ft 15 1 Existing BUA that will be removed (sq ft 323 sf 32_3_sf 16 Percent BUA _ _ 31% 60% 17 Design storm inches 1 in 18 :Design volume of SCM cu ft 38465 cf 19 Calculation method for desi n volume Simple Method ADDITIONAL INFORMATION 20 Please use this space to provide any additional information about the drainage area(s): WET POND 1 Drainage area number 1 2j Design volume of SCM (cu it) 38465 cl iR 31 Is the SCM sized to treat the SW from all surfaces at build -out? *N 4 Is the SCM located away from contaminated soils? Yes 5 What are the side slopes of the SCM (H-V)? 8:1 6 Does the SCM have retaining walls, gablon walls or other engineered s de s opes? No _ 7 8 _ _ Are the inlets, outlets, and receiving stream protected from erosion (10-year storm)? Yes Is there an overflow or bypass for inflow volume in excess of the design volume? Yes What is the method for dewatering the SCM for maintenance?_Pump (prelerred) ?` If applicable, will the SCM be cleaned out after construction? Yes Does the maintenance access comply with General MDC (8)? Yes Does the drainage easement comply with General MDC (9)? Yes If the SCM is on a single family lot, does (will?) the plat comply with General MDC (10)? No 9 10 11 12 13 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 professionW_ I Yes FROM 02H -1058 18 Method used j SAIDA _ 19 Hasa stage/storage table been provided in the calculations? T Yes 20 Elevation of the excavated main pool depth (bottom of sediment removal) (fmsl) - { Elevation of the main pool bottom -(top of sediment removal) (fmslj 536.00 537.00 21 22 Elevation of the bottom of the vegetated shelf (fmsl) 544.00 23 Elevation of the permanent pool (fmsl) 544.50 24 Elevation of the top of the vegetated shelf (fmsl) 545.00 25 Elevation of the temporary pool (fmsl) 546.38 26 Surface area of the main permanent pool (square feet) 13796 st 271,Volume of the main permanent pool cubic feet) _ 72878 of 28 Average depth of the main pool (feet) 5.28 It 29 Average depth equal'on 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 lorebay (cubicfeet) 12798 of 33 Is this 15-201% of the volume in the main pool? Yes 34 35 36 37 Clean -out depth for forebay (inches) Design volume of SCM (cu ft) Is the outlet an orifice or a weir? _ goin _ _ Orifice____ 2.2_ Yes If orifice, orifice diameter (inches 38 39 40 41 If weir, weir height (inches) If weir, weir length (inches) Drawdown time for the temporary pool (days) Are the inlets) and outlet located in a manner that avoids short- circuiting? 42 Are berms or baffles provided to improve the flow path? No 43 Depth of forebay at entrance (inches) 102 in 44 Depth of forebay at exit (inches) 96:n 45 Does water flow out of the forebay in a non -erosive manner? 46 Width of the vegetated shelf (feet) _Yes _ 47 Slope of vegetated shelf (H:V) 6: 48 49 Does the orifice drawdown rom below the top surface of the permanent pool? Does the pond minimize impacts to the receiving channel from the 1- yr, 24-hr storm? Yes Yes 50 51 Are fountains proposed? (If Y, please provide documentation that MDC(9) is met.) Is a trash rack or other device provided to protect the outlet system? No Yes 52 Are the dam and embankment planted in non -clumping turf grass? Yes 53 � Species of turf that will be used on the dam and embankment - as a ap nting p an een prove or N7—e — vegetated-sl,ef -� -- - � FACW Meadow Mix — ..Yes -- ADDITIONAL INFORMATION INFORMATION Please use this space to provide any additional information about 55 the wet pond(s): weq Paro 3 10:47 AM 9/30/2021