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Home My WebLink AboutSW3200701_03-Supplement EZ_20200707SUPPLEMENT EZ COVER PAGE FQR A5 GAdECi PROJECT INFORMATION 1 1 Project Name 2 Pr ect Area ac 3 Coastal Wetland Area rac)- 4 Surface Water Area {ac} 5 is this o ad High or Low pans' 7 6 Does this project use an off -site SCM? Prescot Village Phase 1 10,54 -- -......_ - Na. No COMPLIANCE WrrH 02H .1003{4j 7 :Width of vegetated setbacks provided I feet) 8 .Will the vegetated setback remain vegetated? 68 Yes e 9 Is BUA other that as listed in .100314] fc•d] out of the setback? 10 is streambank stabilization proposed on this project? Yes _ _ _ No NUMBER AND TYPE OF SCMa: 11 [Infiltration-Sntem 0 12 13 Bioretention Cell Wet Pond 0 1 14 15 Stormwater Wetland 0 Permeable Pavement 0 Sand Filter 0 16 17 18 _ Rainwater Harvesting;RWH)_ 0 1 Green Roof 0 Level 5 reader -Filter Sid LS-FS 0 19 20 21 Disconnected Impervious Surface {DISC _ _ — —0 — Treatment Swale 0 D Pond L0 22 _ 23 24 StormFiller Silva Cell - - --—...------- 0 ----- 0 ----- — 0 25 IBMIter 26 Filterra 0 FORMS LDADED .3 --L State, Z _ Email,. ranan r arranGn4 rt . rr�a eci manager DewbenyErtiineers Inc_ 9300 Harris Comers Parkway, Suite 220 Charlotte. NC 28269 - 704-631-5206 blafranchi * dewberry. cam Certllicatlon 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. 11111+111s, `�� CAROB =pQ; �FiSSI0' /l'y Q- Q SEAL 40016 141 1 tia %%%N Signature of Designer 03-06- 20Z0 Date — DRAINAGE AREAS 1LIsalVpart s a high densityro'ect? _ Yes____ 2o number of drainage areas/SCMs 1 _ of this project subject to previous rote 3ons? No 4 5 6 - _ 1 F1 8 FORM5LOADED from project (sq as •246 3s ds on subdivided loi 1) (sq ft) !008 rules '017 rules w BUA outside of subdivided lots (subject permitting) (sf) 2008 rules 2017 rules f1site - total area (sq 1995 rules SL 2006-246 rules BUA (sq ft) - — -- rules _ ,06-246 — 2008 rules —' 2017 rules 11 Design storm (inches) 1995 rules SL 2006-246 2008 rules 2017 rules 12 Breakdown of new BUA: - Sidewalk It - hoof sq ft) - Roadwa ..(s4 - Future sq fti - Other, please specify in the comment box -- ---_— —_--- _ — - -- - — — --- below Isq ft1 New infiltrating permeable pavement on 13 subdivided lots sgft). New infiltrating permeable pavement outside of 14 subdivided lots (sq Ill.. Exisitng BUA that will remain (not subject to 15 ermitt!ngJ (sq ft� 16 Exislin BUA that is alreadw permitted [rrq ft1= I 17 Existinu BUA that will be removed (sq ft� ! 18 Percent BUA 19 _ _ Des' n volume of 5CM cu tt) 20 Calculation method for des' n volume 1ADDITIONAL INFOMATION Please use this space to provide any additional 21 information about the drainage area(s): WET POND 1 Drainage area number 1 2 Design volume of SCM (cu ff) t 29460 cf 13ENEW MDC F110M AZH .11 0 3 Is the SCM sized to treat the SW from all surfaces at build -out? Yes 4 Is the SCM located away from contaminated soils? Yes 5 What are the side slopes of the SCM (H:V)? 3=1 Does the SCM have retaining walls, gabion walls or other 6 engineered side slopes? No Are theintets, outlets, and receiving stream protected from erosion 7 (10-year storm)? Yes Is there an overflow or bypass for inflow volume in excess of the 8 design volume? Yes _ 9, What is the method for dewatering the SCM for maintenance? Drawdown Orifice plicable, will the SCM be cleaned out after construction? Yes sthema6tenance access comply with General MDC (8)? Yes sthe drainageeasemerncomplywith General MDC (9)? +2D YesSCM is on asingle family lot, does (will?) the plat comply with eral MDC (10)? Yes 14 Is there an O&M Agreement that complies with General MDC (11)?_i Yes 15 Is there an O&M Plan that complies with General IuIpG (i2j7 _ j Yes 16 Daes the SCM fallow the device specific MDC? _ Yes _j 17 Was the SCM designed by an NC licensed professional? _ _ Yes 18 Method used SA/DA 19 Has a stage/storage table been provided in fhe calculations? Yes Elevation of the excavated main pool depth (bottom of sediment 20 removal) (fmsl) 501.50 21 Elevation of the main pool bottom -(top of sediment removal) (fmsl) 502.00 507.00 22;Elevation of the bottom of the vegetated shelf(fmsl) 23 Elevation of the permanent pool (fmsi) 507,5U 508.00 _ 24 Elevation of the top of the vegetated shelf (fmsl) 25 Elevation of the temporary pool (Imsl) _ 509.14 26 Surface area of the main permanent pool (square feet) 11117 sf 27 Volume of the main permanent pool (cubic feet) 43992 cf 28 Average depth of the main pool (feet) .396 It Equation 2 29 Average depth equation used _ if using equation 3, main pool perimeter (feet) 30 B_274 cf 31 If using equation 3, width of submerged veg, shelf (feet) 32 Volume of the forebay (cubic feet) 33 Is this 15-20% of the volume in the main pool? Yes 5 in 34 Clean -out depth for forebay (inches) 35 Design volume of SCM (cu ft) _ r 29460 cf 36 Is the outlet an orifice or a weir? Orifice 37 If orifice, orifice diameter (inches) ! 3 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 1.09 Ara the inlat(s) and outlet located in a manner that avoids shorl- 41 circuiting? Yes 42 Are berms or baffles provided to improve the flow path? Yes 43 Depth of forebay at entrance (inches) 6 In 44 Depth of forebay at ex t (inches) in 45 Does water flow out of the forebay in a non -erosive manner? Yes 46,Width of the vegetated shelf (feet) 10 ff 47!SI60e of vegetated shelf (H:V) 10:1 ;Does the orifice drawdown from below the top surface of the 48 permanent pool? No Does the pond minimize impacts to the receiving channel from the 1- 49 yr, 24-hr storm? Yes _ Are fountains proposed? (If Y. please provide documentation that 50 MDC(9) Is met.) l No I 51 [Is a trash rack or other device provided to protect the outlet system?' Yes I 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 - — Fescue Mix -- — Was a planting plan been provk%c or t e vegetate sfr`elf7 - - - Yes ADDITIONAL INFORMATION Please use this space to provide any additional information about 55 the wet pond(s): Wet Pond 4 10:29 AM 1/24/2020