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Home My WebLink AboutSW4240201_Supplement-EZ Form_20240209 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name € Sawmill Woods 2 Project Area(ac) 90 ac 3 Coastal Wetland Area...(ac). .. ..........._, 4 Surface Water Area(act 0 5 Is this project High or Low Density? High 6 Does this project use an off site SCM? No iCOMPLIANCE WITH 02H.1003(4) 7 !Width of vegetated setbacks provided(feet) 8 Will the vegetated setback remain vegetated? 9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d? 10 Is streambank stabilization proposed on this project? )NUMBER AND TYPE OF SCMs: is 11 ,Infiltration System 0 12 Bioretention Cell ............. _.._ 0 __......... .. 13 Wet Pond ......... __..._ 5.......... .... 14 Stormwater Wetland 0 15 Permeable Pavement _ 0 16 Sand Filter 0 17 Rainwater Harvesting(RWH) _........._._.._.__ _ 0. 18 Green Roof 0._.,__ ____ 19 I Level Spreader Filter Strip(LS-FS) 0 20 I Disconnected Impervious Surface(DIS) €. ................. 0............ 21 iTreatment Swale ..... 0 22 D Pond__. _,. __ .._ 0 _.__.._.._..__...... 23 StormFilter _p 0 24 Silva Cell 0 .............. 25 IBayfilter ..... .... U.._._......_....._. _. 26 i Filters i FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: _ Jeremy Keeny 1 28 (Organization: Morris&Ritchie Associates 29 Street address: 530 Hinton Pond Road Suite 104 30 City State Zip: I Knightdale NC,27545 _.o 31 Phone number(s): I 32 Email: I 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 `0t1111111111111j ,•�,` tpROj� 'f f op , 701--- /��, Si ature of De - 5 9 ri 32 ��, .•• • IN ",/„R£M yaw '215-I24 Date DRAINAGE AREAS Mil Is this a high density project? Yes IIIIf so,number of drainage areas/SCMs ) 5 Does this project have low density areas? r No Es If so,number of low densit rLdraina•e 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 4 Type of SCM Wet Wet Wet Wet 5 Total drainage area(sq ft) ., 142883.4118 162461.3224 19752779 567002 6654 6 Onsite drainage area(sq ft) 142883.4118 162461.3224 197527.79 567002.6654 7 Offsite drains a areas ft 0 0 0 0 8 Total BUA inprojec(sq ft) _._ _.. sf sf sf sf New BUA on subdivided lots(subject to permitting) 9 _"s�c ft) 44458 sf 30602 sf 86038 sf 254387sf I New BUA not on subdivided lots(subject to 10 I permitting)(sf) sf sf sf sf 11 J,Offsite BUA s ft) sf ._ sf sf -.. Sf. 12 Breakdown of new BUA not on subdivided lots: Parking(sq ft) sf sf sf sf _I -Sidewalk(sq ft) 336_0 sf 7158 sf 5017 sf 15012sf 1 Roofs ft 15411 sf 13500 sf 39664 sf 83261 sf Roadway(sq ft)_ — 18324 sf 34897 sf 23919 sf 94075 sf -Future(sq ft) sf sf sf sf -Other,please specify in the comment box _ below s ft sf sf sf sf - New infiltrating permeable pavement on 13 subdivided lots(sq ft)_ sf sf sf sf ,'. New infiltrating permeable pavement not on 14 subdivided lots(sq ft) _.__ _._ __._ .___sf._.-. _ sf _. .....,.._. ..... ... ._.,.sf...___ ....,_ sf Existing BUA that will remain(not subject to 15 ermitting)(sq ft) sf . ._._sf sf sf __ 16 Existing BUA that is already permitted(sq ft) _ sf sf sf sf 17 Existing BUA that will be removed(sift) sf sf _ sf sf 18 Percent BUA 31% 37% 44% 45% 19 Design storm finches 20 Desi n volume of SCM_(cu ftI 4472 cf 6128 cf 4624 cf 37547 cf 21 Calculation method for design volume ADDITIONAL INFORMATION Please use this space to provide any additional information about the n 22 drainage area(s): WET POND ...i g t.... 1 Drainage area number 1 2 3 4 5 2 Minimum required treatment volume(Cu ft) 3930 cf 5200 Cf 7276 cf 21442 cf 9674 Cf -- ----- GENERAL MDC FROM 02H.1050 31 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes Yes Yes Yes 4jIs the SCM located away from contaminated soils? Yes Yes Yes Yes Yes 5 What are the side slo es of the SCM(H:V)? 3:1 3:1 3:1 3 1 3:1 Does the SCM have retaining walls,gabion walls or other engineered! 6E No No No No No side slopes? 7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes Yes Yes Yes _;(10-year storm)? 8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes Yes Yes Yes i. design volume? 9;What is the method for dewatering the SCM for maintenance?i_ -- 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 11 Does the maintenance access comply with General MDC(8)? Yes Yes Yes Yes Yes 12 Does the drainage easement comply with General MDC(9)? Yes Yes Yes Yes Yes 131If the SCM is on a single family lot,does(will?)the plat comply with N/A N/A N/A N/A N/A General MDC..(10)?...,.. 14(Is there an O&M Agreement that complies with General MDC(11)? t € 15 Is there an O&M Plan that complies with General MDC(12)? 16 Does the SCM follow the device specific.MDC? Yes Yes Yes Yes Yes 171 W as the SCM designed by an,,NC licensed rofessional? WET POND MDC FROM 02H.1053 18ISizing method used SA/DA SA/DA SA/DA SA/DA SA/DA 19 Has a stage/storage table been provided in the calculations? Yes Yes Yes Yes Yes Elevation of the excavated main pool depth(bottom of sediment 20, 806 00 801.00 803.00 809.00 807.00 removal)(fmsl Elevation of the main pool bottom(top of sediment removal)(fmsl) 1 806.50 801.50 803.50 809.50 807.50 • 22'Elevation of the bottom of the vegetated shelf(fmsl) 812.00 806.00 € 808.00 813.00 811.00 23Elevation of the permanent pool(fmsl) 812.00 806.00 808,00 813.00 811.00 25 Elevation of the temporary pool fins!) ( ) 813.31 807 41 8 9 00 814 00 812.00 24 Elevation of the top of the vegetated shelf fmsl 813.00 807.00 r 8 09 52 815.56 812.33 26 Surface area of the main permanent pool(square feet 1857 2451 3241 14485 12079 27 Volume of the main permanent pool(cubic feet) 5767 cf 7442 cf 10003 cf 44076 cf 37318 cf t 28 Average depth of the main pool(feet) 3.11 ft 3.04 ft 3.09 ft 3.04 ft 3.09 ft 29 Average depth equation used 30 If usinga uation 3,main poolperimeter feet 1 31 If using?ciliation 3,width of submerged veg.shelf feet 32 Volume of the forebay(cubic feet) 925 cf 1231 cf 10003 cf 44076 cf 37318 of 33 Is this 15-20%of the volume in the main pool? Yes Yes Yes Yes Yes 34 Clean out depth for forebay(inches) 1 24 in 24 in 24 in 24 in 24 in 35 Design volume of SCM(cu ft) 6692 cf 8673 cf 11761 cf 50932 cf 43806 cf 36 j Is the outlet an orifice or a weir? Orifice Orifice Orifice Orifice Orifice 371 If orifice,orifice diameter(inches) .8 in .8 in 1.in 2.in 1.25 in 38) If weir,weir heightnches) t - 39 If weir,weir length(inches) 40(Drawdown time for the temporary pool(days) 2 .2.9 2.6 2.2 2.5 I 413Are the inlet(s)and outlet located in a manner that avoids short Yes Yes 1 Yes Yes Yes :circuiting? _ 421Are berms or baffles provided to improve the flow path? Yes Yes Yes Yes Yes 1 43 Depth of forebay at entrance(inches) 30 in 36 in 36 in 24 in 30 in ; 44 Depth of forebay at exit(inches) 30 in 36 in 36 in 24 in 30 in 45!Does water flow out of the forebay in a non erosive manner? Yes Yes Yes Yes Yes _ 461Width of the vegetated shelf(feet) E ft 6 ft E ft 6 ft E ft 47 Slope of vegetated shelf(H V) 6:1 _6.1 6:1 6:1 6:1 Does the orifice drawdown from below the top surface of the ( , 48 permanent ool? Yes Yes Yes Yes Yes ( Does the pond minimize impacts to the receiving channel from the 1 49 Yes Yes Yes Yes Yes yr,24-hr storm? 50 Are fountains proposed?(If Y,please provide documentation that f No MDC(9)is met_ No No No No t 51 Is a trash rack or other device provided to protect the outlet system? Yes Yes Yes Yes Yes 52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes Yes Yes Yes 53 S•.cies of turf that will be used on the dam and embankment 54 Has a•lantin• •lan been .rovided for the vegetated shelf? Yes - Yes Yes Yes Yes m.ITIONAL INFORMATION Please use this space to provide any additional information about the I 55(wet pond(s): ( txr or nr 1 1)•n4 PM?/s/?n74