Agenda - Parks and Recreation Commission - 04/08/2004

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Alpine Woods Preliminary ~]ar ~eview ~zfarch 2d, 2004 ., .. ~ov~i ~ffs. ~s ~ ~ust be ~d~d to ~a~t~y z~s to b~ ~o~ed and to z~ o~ th~ p[a~ as wei] ~ their species. Wetlnnds: A substantial portion of the proper:3,' is wetland. A wetland delineation report has been submitted; staff will be prepared to corrmment on this report at the Planning Commission meeting. This report will also need to be submitted to the Lower Rum Privet Water Management Organization for verification. .. Drainage: A drainage and ~ading plan has been prepared by iv[ark Kzetchmer PE of Passe Engineering. This plan proposes to construct rxvo ponds located on the north and south ends of the development. Ali street surYaces, except for the southerly 200 feet of Vanadium Street (the nort~south s:reet), and the ~rure residential stracrures on the e~t side of Vanadium. Su-eet wilt drain to these ponds prior to overflowin6 in~o DixFR protected wetland 7_34.W. A review of this fading and drainage pl~. has been made and the £oll. owing commen~ are 1. Calculations have been submitted showin,o the 10-year and 100-year event for sediment ponds A and B. HOwever no inz%rmarion is presented for wetland 7.34 which is ~iparian to ten of the subdivision lots. The 100-year flood elevation needs to be established ~or this wetland and the lowest floor strUcture elevations must be a minimum of one foot above :his elevation. Stafif is also recommendin~ that the house pads be located at least 2 vertical feet above the edge of' the delineated wetland. 2. Four existing residences are proposed to remain within, the new subdivision. Existing Iow floor and at ~mde elevations should be added for these sumcmres to the ~ading plan. 3. Proposed fi.on: comer elevations should be added to allow veMflcation of adequate overland draina_~e from individual lots. In particular, Lots 6 & 7 of Block 4 should be evaluated to insure that a minimum ~ade of one percent exists over all turz%d areas. 4. A table speci ,lying house type, garage elevation, mir~mum floor and at-~ade 100-year flood elevations and front and 'backvard slopes must be added to the plan. $. The sou:hem_most 200 feet of Vanadium Street dr-ins onto 157 Lane and westward to its intersection with Xenon Sn-eet. This is a low point Where water remains in the ditch tm:il it percolates into the. sandy soil. tn view of ~2~.is situation, a catch basin should be added at the imtersection of Vanadium and 157 Lane to collect the :~no~' from the south 200 le~t ofYanadium Su-eet as well as the portion of 153~ Lane to. mitigate this situation. 6. A permit must be obtained fi.om the Lower Rum t~Sver Water Maintenance Orgariization - to insure the adequacy of the storm wa:er system and erosion control measures. Streets: The szree~ system for ~is development has been detailed on a three-sheet set of plans. .Staff" o~'z%rs ~he following comments: i. Stree~ names must be added to the preliminary and Final pint documents. Sta~" suggests the following names to be consistent with the ,~moka Count7 g-ri.'d syitem: Vanadium Street Nx,V; Uranium Street NW; 154~ Circle or Court NW; and 155~h Lane NW. 2. Sidewalks are required on one side of every :.brough street. No sidewalks have been proposed on the plan submi~ed. 3. The v/pical section of rhe street cross section should be modified to show a s=eet width of 31 feet fi-om back of curb to back of curb. 31