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Home My WebLink AboutSW3220702_Supplement-EZ Form_20230703 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 I Project Name Preserve at Forest Creek Phased 2 Project Area(ac) 105.26 3 Coastal Wetland Area(ac) 0 4 Surface Water Area(ac) 1 2.5 5 Is thisect High or Low Density? High 6 Does this project use an of site SCM? No COMPLIANCE WITH 02H.1003(4) 7 _Width of vegetated setbacks provided(feet 1 30 8 Will the vegetated setback remain vegetated? Yes - 9 If BUA isproposed in the setback,does it meet NCAC 02H.1003141(c-d)? _No 10 ils streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System : 0 12 Bioretention Cell 1 0 13 Wet Pond 6 14 Stormwater Wetland 0 15 Permeable Pavement _ 0 16 Sand Filter 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 Dry Pond 0 23 StormFilter 0 24 Silva Cell 0 25 Bayfilter _ 0 26 Filterra 0 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title Frank McMahan,PE 28 • -nization: Landdesign WI Street address: 223 North Graham Street 30 City,Statejip: Charlotte,NC,28202 ___ 31 Phone number(s1: - (704)333-0325 32 Email. fmcmahan@landdesign.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 She 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. Deslan: / `,,rrrtrrr,,rnn �•Q 9�'•9 Sgnetu •, .SEAL = 037773 ,,,n r r r r r r s,,�� Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so,number of drainage areas/SCMs 6 3 ,Does this project have low density areas? _ No _ 4 If so,number of low density drainage areas 0 Is all/part of this project subject to previous ru e 5 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Slte 1 2 3 4 5 6 4 'Type of SCM WETPOND 7 WETPOND 8 WETPOND 9 WETPOND 10 WETPOND 11 WETPOND 12 5 Total drainage area(sq ft) 3675518 652273 713193 758878 521855 326,050 361401 6 Onsite drainage area(sq ft) 3309748 652273 713193 675917 260828 304484 361,401 7 Offsite drainage area(sq ft) 365770 0 0 82961 261027 21782 0 8 Total BUA in project(sq ft) 1907506 sf 456138 sf 492368 sf 448137 sf 102441 sf 206857 sf 201565 sf New BUA on subdivided lots(subject to 9 permitting)(sq ft) 1412904 sf 337208 sf 383694 sf 342308 sf 69780 sf 154183 sf 125731 sf New BUA not on subdivided lots(subject to 10 permitting)(sf) 494602 sf 118930 sf 108674 sf 105829 sf 32661 sf 52674 sf 75834 sf 11 Offsite BUA(sq ft) 365770 sf N/A N/A 82961 sf 261027 sf 21782 sf N/A 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) 1551 sf N/A N/A 932 sf N/A N/A 619 sf Sidewalk(Eft) 132321 sf 32993 sf 27939 sf 28828 sf 8296 sf 14257 sf 20008 sf -Roof(sq ft) N/A N/A N/A N/A N/A N/A N/A -Roadway(sq 8) 294037 sf 70323 sf 66131 sf 61434 sf 20196 sf 31054 sf 44899 sf -Future(sq ft) N/A N/A N/A N/A N/A N/A N/A -Other,please specify in the comment box below(sq ft) 66693 sf 15614 sf 14604 sf 14635 sf 4169 sf 7363 sf 10308 sf New infiltrating permeable pavement on 13 subdivided lots(sq ft) N/A N/A N/A N/A N/A N/A N/A New infiltrating permeable pavement not on 14 subdivided lots(sq ft) N/A N/A N/A N/A N/A N/A N/A Existing BUA that will remain(not subject to 15 permitting)(sq ft) N/A N/A N/A N/A N/A N/A N/A 16 Existing BUA that is already permitted(sq ft) , N/A N/A N/A N/A N/A N/A N/A 17 Existing BUA that will be removed(sq ft) N/A N/A N/A N/A N/A N/A N/A , 18 Percent BUA 52% 70% 69% 59% 20% 63% 56% 19 Design storm(inches) N/A 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in 20 Design volume of SCM(cu ft) N/A 63480 cf 42439 cf 40957 cf 22349 cf 16594 cf 19641 cf _ 21 Calculation method for design volume NIA PONDPACK PONDPACK _ PONDPACK _ PONDPACK PONDPACK PONDPACK ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): Other BUA includes curb&gutter.Offsite drainage area has been assumed to be 100%BUA.Refer to the deed restriction form for on-site lot BUA percentages. WET POND 1 Drainava area number 7 ri 8 I{ 9 10 11 12 2 Minimum required treatment volume(cu k i 36923 d 1 39888 d I 42986 d I 29421 d } 18511 d 1 16633 d MDC. D2N.1ffiO 31s 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:VZ? 3:1 _ _ 3:1 _ _- 3:1 3:1 3:1 3:1 &Does the SCM have retaining walls,gabbn walls or other engineered Yes No Yes No Yes Yes _ -0--- - -.-- -- 7 Are the inlets,outlets,and receiving stream protected from erosion Yes 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 Yes design volume? 9 What is the method for dewatering the SCM for maintenance? Pump preferred) Pump(plrfert 4) Pump(preferred)- Pump(preferred) Pump(preferred) Pump(preferred) 10 If applicable,will the SCM oe 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(9r? Yes Yes_ _______Yes____ _� Yes Yes Yes 13 It the SCM is on a single family lot,does(will?)the plat comply with N/A N/A N/A N/A N/A N/A General MDC(10)7 - 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(122? 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 des'gned by an NC licensed professional? Yes Yes Yes Yes Yes Yes ND MDC FROM pit.1oq 181,Sizin9 method used SAIDA ' SAIDA SAIDA SNDA SAIDA SA/DA 19 Has a staga'slorape table been provided in the calculations? T Yes Yes Yes Yes Yes Yes 20 Elevation of the excavated main pool depth(bottom of sediment 639.50 616.50 649.50 y 649,50 627.50 608.50 removafms� -, 21 Elevation of the main pool bottom(top of sediment removal)(final) 640.00 617,00 650.00 650.00 628.00 609.00 221 Elevation of the bottom of the vegetated shelf(fmsl) 643.50 621.50 � 653.50 654.50 ` 632.50 613.50 23 Elevation of the permanent pool(fmsl) 644.00 622.0D 654.00 655.00 633.00 614.00 ~ 24 Elevation of the top of the vegetated shelf(frnsl) 644.50 622.50 654.50 655.50 633.50 _- 614.50 _ �_ 25 Elevation of the temporary pool(this]) __...-_ 646.30 624.00 656.00 656.35 634.55 615.75 26 Surface area of the main permanent pool(square feet) 20972 15467 15571 11698 6265 7955 _ F_27 Voume of the main permanent pool(cubic feet) 71526 d 62265 d 54625 d 44571 d31369 d 29266 d 2 8 Avei aye depth of the main pool(feet) 3.41 ft 4.03 ft 3.51 ft 3.81 ft3.80 ft 3.68 ft I__ 29 Avcrago depth equation used � Equation 2 Equation 2 Equation 2 Equation 2 Equation 2 Equation 2 30 It using equation 3,main pool perimeter(feet) N/A N/A N/A N/A N/A N/A 31 If using equation 3,width of submerged wig shelf(feet) N/A N/A N/A N/A N/A _ N/A 32 Volume of the forebay(cubic feet) t 13856 d 11358 cf 10079 d 7880 d 4934 cf 4634 d 33 Is this 15-20%of the volume m the main pool? I Yes �� Yes Yes Yes _ Yes Yes 34 Clean-out depth for forebay(inches) 6 in 6 in _ 6 in 6 in 6 in 6 in 35 Design volume of SCM(cult) 63480 d 42439 d 40957 d 22349 d 16594 d 19641 d r 36 is the outlet an onfice or a weirs _ Orifice Orifice Orifice Orifice Orifice Orifice 37 P orifice,orifice diameter(inches) 3.00 in - 2 50 in 3.00 in 3,00 in_ - 2.00 in 2.25 in _ 38 P weir,weir height;inches `, N/A __�___ N/A N/A N/A N/A N/A I 39 If weir,weir lend j nches; N/A N/A _f N/A _ _ NIA N/A N/A 40 Drawdown time for the temperer/poi(days.) 2 70 3.59 2 49 2.26 2.56 _- 2.31 _ 41 Are the r'let(s)and outlet located in a manner that avoids short Yes Yes Yes Yes Yes Yes circultln�7 -- 42 Are bemis or baffles provided to improve the!towpath? No No No No No _ No 43;Depth of forebay at entrance(inches) __ 58 in 70 in 58 in 70 in 70 in 70 in 44 Depth of forebay at exit(nches) 54 in 66 in 54 in 66 in 66 in 66 in 45 Does water flow out of the forebay in a not-erosive manner? _ Yes Yes Yes Yes Yes Yes 46 Width of the vegetated shelf(feet) E ft 6ft 6 ft 6 ft 6 ft 6 ft 47 Slope of vegetated shelf(H'V) 6:1 , 6:1 6:1 6:1 6:1 6:1 48 Does the onfice drawdown from below the top surface of the Yes Yes Yes Yes Yes Yes permanent pore? , 49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes Yes Yes Yes Yes �yr.24-hrstorm7 � 50,Are fountains proposed?Ill Y.please provide documentation that No No No No Na No MDC(9;is meg .-_-- 51 Is a trash rack or other device provided to protect the outlet system? Yes Yes Yes Yes Yes Yes 52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes Yes Yes Yes Yes 53 Species of turf that MI be used on the dam and embankment HYBRID HYBRID HYBRID -' HYBRID HYBRID HYBRID BERMUDA , BERMUDA --BERMUDA BERMUDA BERMUDA • BERMUDA 54 Has a planting plan been provided for the vegetated shelf? I Yes Yes Yes Yes Yes Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s) 7