The URL can be used to link to this page

Home My WebLink AboutSW3220702_Supplement-EZ Form_20230502SUPPLEMENT-EZ COVER PAGE F- FORMS LOADED PROJECT INFORMATION I I Project Name 2 [Prc4ect Area lac) Preserve at Forest Crook Phass2 105-26 0 3 .Coastal Welland Area (ac) 4 Surface Water Area (scl .......... . ........... 5 19 this projpct High or mow Density? 2,5 Hi 6 Does this project use an off -site SCM7 No COMPLIANCE WITH 02M.1003(4) 7 Width of vegetated setbacks provided {feet} 30 Yes 8 Will the vegetated setback remain vegetated? 9 10 j 5f BUA is proposed in the setback, does it meet NCAC 02H - !a streambank stabilization proposed on this project? No No NUMBER AND TYPE OF SCMs: 11 Infiltration Infiltration System 0 12 13 Cell ...... . ..... ,Wet Pond 0 6 0 14 Slormwater Wetland 15 116 Permeable Pavement Sand Filter ............... ... Rainwater Harvesfing (RWH) 0 0 0 17 18 19 Green Roof 0 Level Spreader-Foter Strip JLS-FS) Disconnected Impervious Surface (DIS) 0 20 21 22 Treatment Swale Dry Pond 0 0 23 SlormFifter 24 25 Silva Cell 10ayr-lier IFilterra 0 0 0 26 DESIGNER CERTIFICATION 27 Name and Tide Organization: Frank McMahan PE 28 29 Street address: 223 North Graham Street 30 31 Cij, State, Zip . .......... Phone numbs : Email: Charlotte, NC, 28202 325. 32 firricirnalhan@Ianddesign.corn C8111112011al) slalliimerit: 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, aw rate, and complete; and that the engineering plans, specifications, operation and maintenance agreements and other supporting Information are oonsislent with the Information provided here. % 00 A Ro SEAL 037773 Signature ign ure esigner 1 117 7 12 z7Z -3 Date / AREAS ty project? Yes iraina a areaslSCMs 6 eve low density areas? No ow dens ty, drainage areas 0 oject subject to prev ous rule No ORM 5 LOAD t 1 RMATION Entire Site 7 8 9 10 11 12 _ 3849980 WETPOND 652093 WETPOND 713077 WETPOND_ _ 758815 WETPOND 521848 WETPOND 326264 WETPOND 563231 ....ft a On ea (sq ft 3323776 526204 652093 0 713077 0 676051 260924 - 260924 _304484 21780 - 375495 - 160736 ea (sq ft 82764 — :t tsq ft) - - ivided lots (subject to ubdivided lots (subject to 1454962 sf 784471 at 670491 sf 343325 sf 330282 sf 31108.7at 88932 sf 150733 sf 185327 sf _ 139.5_ 53 sf 203772 sf 191291 sf 179497 sf 47337 sf 85547 sf _ 95970 sf 138991 sf 131590 sf 41595 of 65186 sf 89357 sf NIA _ NIA_ NIA NIA NIA NIA BUA not on subdivided lots: _W_A — 151964 sf 61065 of 33117 sf - 31019 sf 27904 sf 24937 sf 29101 sf 8934 sf 8296 sf 12512 sf 14257 sf 13497 sf 19946 sf 132621 of _ NIA NIA 70323 sf 22286 sf 16981 sf N/A NIA 65623 sf NIA 6.2759 sf NIA 20196 sf NIA 4169 sf WA 31054 sf NIA 7363 sf NIA _ 45600 sf NIA 10314 sf I 295555 sf 22286 sf NIA 14445 sf - WA NIA NIA NIA 14793 sf pacify in the comment box meable pavement on ft).- meable pavement not on ft) 68065 sf NIA --- NIA NIA NIA NIA NIA NIA NIA NIA NIA NIA hill remain (not subject to NIA NIA NIA NIA N/A _ _ N/A_ MIA s alread ermitted s ft _ will be removed (s ft NIA NIA NIA NIA _NIA NIA WA NIA NIA N!A N1A 1790 NIA N!A 33% .w. 38% 53% 46% 1 0 in 35305 tfi � � � � � - 41% 46% _ es NIA 1.0 in 1,0 in � 33328 cf 1.0 In _ 12782 cf 1.0 In 1.0 in 19865 cf 3CM cu ft _ WA _ 33069 cf 15249 cf or design volume WA PZWff PAICF A TION ace to provide any addil onal information about the & gutter WET POND 1 Dramatis area number 2 Minimum rEquired treatment volume ou R 7 8 9 10 11 12 28461 cf 27735 of _ 26458 cf 8839 of 12663 d _ 16232 d 3 Is the SCM sized to treat the SW from all surfaces at build -out? 4 Is the SCM located awag from contaminated soils? Yes Yes Yes Yes Yes Yes Yea Yes Yes Yea Yee Yes 5 What are the aide sloilms of the SCM H:V ? 3:1 3:1 3:1 Yes 3:1 3:1 3:1 Yes 6 Does the SCM have retaining walls, gablon walls or other engineered aid M Yes No No Yea the inlets, outlets, and receiving stream protected from erosion 7 P-Year storm}? 8 Is there an overflow or bypass for inflow volume In excess of the -des' n volume? Yea Yes Yes _ _ _ _ _ ___ Yes Yes ------....- Yes Yes Yes Yea Yes Yes Yes 9 What is the method for dewateft the SCM for maintenance? If licable will the SCM be Geared out after construction? Pumpreferredj Yea Purr1 jQMerradrNerred Yes Yes Pump jprafercedk Yes Pump jpreterred] Yes Pump fpfeferred Yes 10 11 Does the maintenance access comoily with General MDC 8 ? Yea Yes -,..... WA Yes Yes - - f VA Yea Yes Yea Yes -- - Yes NIA Yes 12 Does the drainage easement comply with General MDC 4917 If the SCM Is on a single family lot, does (will?) the plat comply with General MDC 10 ? Yes N/A - NIA Yes NIA 13 14 Is there an O&M Agreement that complies with General MDC (11 }? Yes Yes Yes 15 Is there an O&M Plan that complies with General MDC 1 ? Yes Yes Yea Yea Yes Yes Does the SCM follow the device specific MDC? Yes Yes _ Yea _ _ _ _ _Yes Yes _ _ Yes lWas the SCM designed by an NC licensed ofessional? Yes as Yea Yes Yes Yes Sizing method used _ _ SAIDA SAIDA SAIDA SAIDA SAIDA SAIDA _ Has a s"!gjtoraa table -been ided in the calculations?--__.-.- . .--... Yes Yes Yes Yes Yes Elevation of the excavated main pool depth (bottom of sediment removal 839 816.50 649.50 649.50 627.50 608.50 fmsl -18 17 18 19 20 21 22 23 Elevation of the mainapupl bottom.ttcp of -sediment removall (fmsll Elevation of the bottom of the v egetaied.shefi fmsVL-. _-..-._.-_. Elevation of the rmanre t I fmsl 640.00 643.50 617.00 621.50 65000 65350 650.00 654.50 626.00 632.50 _ 609:00 _ 613.50 __ 644.00 622.00 65400 655.00 633.00 614.00 24 25 Elevation of the .top of the vaAetated shelf fmsl�...... --... Elevation of the tam ra I fmsl _ _ - ___ �iPa?i._ 644.50 645,26 622.50 623.88 65450 655.67 655.50 656.09 633.50 634,54 614_50 615.77 26 Surface area of the main rmannent I s re feel 20877 15467 15276 6401 7106 7965 27 28 Volume of the maln rmanent pool (cubic feet ..... -. -.. Average depth of the main _ (feet _ Avers depth 4quation used 71237 d 3AI R 62265 cf 4.03 ft 53M cl 20853 of 3,26 ft 21928 cf 3.09 ft 29M cf 3.68 ft 3.49 ft 29 Equation 2 Equation 2 Equation 2 Egtqtion 2 Equation 2 Equation 2. -- 31 If us!-laquation 3,.main puWjxirimeter jfeet.- ... Il us r e uaiion 31widih o1 subm v p. sheN�fee N/A N/A NIA NIA NIA NlA N!A -- N/A NIA NIA _ NIA NIA 32 Volume of the foreh cubic feet 12599 d 11358 d 9423 d 4052 cf 3977 of 4814 d 33 's this 15-20% of the volume in the main pool? Clean_out ih for forebaX (inches} Yes 6 in Yee Bin Yes 6 in Yes Bin Yes sin _ _Yes 6 in 34 35 Design volume of SCM rcu fl 33069 d35305 d Orifice - 2.50 in 33328 d Orifice - ............._........ 3.00 in 12782 d Orifice ..._.. _ ...._. 2.00 in 15249 d _ 19865 d _._ Orifice 2.25 in 36 37 s the cutlet an orifice or a weir/ If orifice, orifice d ametee (inches): Orifice 3.00 in Orifice 2,00 in 38 If weir weir height inches N/A N!A _ _NIA - NIA -_...... F2 ___N!A__ _ - N/A 2.27 N!A N/A N/A 39 If weir, le weir th Irnehesj Drawdown time for the tam da NIA 2.70 NIA. 3.59 NIA .. - 2.56 40 3.01 41 42 Are the inlet(s) and outlet located in a manner that avoids short ClfCllillnp? Are berms or baffles provided to improve the flowpath? Yes No Yes Yes Yes Yes Yes No No No No No 43 D of foret44at entrance linchesj _-_ __ 58 in - . _ 54 in 70 in 64 in 50 in - 44 in 70 in 64 In 70 in .. 64 in 70 in 54 In 44 Depth of forebay at exit {-nchea Does water flow out of the foreba In a non -erosive manner? 45 Yes Yes Yes Yes Yes Yes 46 Width of the yeastated shelf feat ft B ft 6:1 6:1 6:1 6.1 6:1 47 46 Slope of vegetated aheH Does the orifice drawdown from below the top surface of the ij:ermanaryt 17 -6 _ Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 49 Does the pond m-nimize impacts to the receiving channel from the 1- 24-hr storm? Yes 50 re fountains proposed? ( f Y. please provide documentation that kMDCM is mot. No No No No No No 51 52 Is a trash rack or other device provided to protect the outlet system? a the dam and embankment jilanted In non clurrigift turf rasa? Yes Yes Yes Yes Yes Yea Yes Yes Yes Yes Yes Yes 53 Species of turf that wi I be used on the dam and embankment HYBRID l}ERMUDA HYBR D BEEMUDA HYBRID BERMUDA HYBRID BERMUDA HYBRID ERVUDA HYBRID BERMUDA 54'Has a Mi Ian been nrovided for the stated shelf? Yea Yes Yea Yes Yea Yes -- - ADDITI Please use this space to provide any additional .nformation about the 55 We'. aogd 1 11:34 PM 1/26/2023