CCP 11-25-1996 - Laserfiche WebLink

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. . 1.11 Hansen Thorp Ste':DI1 L. Pellinen, P.E. Paul A. Thorp. LS. 1/2'1 Lmlrie A. Johnson. P.E. Lloyd E. Pew, l.S. -S . Pellinen Olson Inc. Ted W. Anderson D. Daniel Thorp, LS. .. ; l) Engineers' Surveyors . landscape Archilecls J:ln Wager Anderson, LA. Oenni::r 8. Olmstead, LS. .. 19 Se[lternher 1996 . KKE ArehiteeL~, Inc. J(Xl First Avenue North Minneapolis MN 55401 . Nln: Kathy An,k'rson Suhj: SL Paul Pmperties/AdlY'S . Lexington &: Gr'cy Fo.~ Road. Arden lIills, l'vlinnesota Dear Kathy: . We oller the following res[lonses to the City's review comments for this project regarding grading, drainage and ulilitks. . l. Parkillg lot grades at the northeast comer of the existing stmcture . . . are flat. The parking lot grades for tlte new parking lot are approximately 2'.... exceeding the generally acceptable minimum of 1 % for [larking lots. . 2. Pond areas are shown over an existillg gas mail!. The location of the gas main is above the proposed 100 year flood elevation. so it is outside the [landing area. Some grading is shown over the gas main north of the proposed driveway at Lexington. These grades. if they ar'e a [lroblem, .. can be slightly adjusted as necessal)' for the e.xacllocalion of the gas main during constr'uction. Utility companies arc always required to be nolilkd by the contractor prior to construction. J. Sronn I'III/off calculaliol/S lIIusl be provided 10 indimled ...ltat Irigh water levels presented 011 . lite plall.' (lcluallv indicate. Calculations. which also have been submitted to the Rice Creek Watershed District. arc attached to lit is response. . 4. 77wre doe., I/ot alJf'ellr 10 he 1111 elllergency (I\'clj7on,/cJrpOllding arcas. Ifllte Imter elel'lltiol/ excecd, a!'JJ/'(Jxil/wlely Y30, itllJ'J1ellrs Ihllll\'ater ll"OlIldjlow to the service slwivn SOll/1t vfllte site. The lowest an;a south of the site is at ap[l1'Oximately elevation 932 in the paddng arca . immeuiately adjacenlto the pond. Emergency ovcdlow for the pond will occur at a[lproximately elevation 9323. alth0 drivcway entrance to Arby's at Lexington or in the boulevard area betwcen the pond and Le.~ington Avenue. No dt"ainage will go south. . 5. SIIb.\"//lface pond sideslopes sltould be 4:1 or grelltl'/: 71/is could be I/chieved by reducing Ihe 10:1 bench provided III the pond edge. The existing pond is being redesigned to mC0t NURP standards as required by the Watershed District for the new development. Thc:se standards include . the 10: 1 bench and a wet pool volume required helow nonnal water level which can only be achieved with the pro[losed 3: I slopes. The 10:1 bench is functional both from a safety stanupoint and fot" providing for emergent wetland vegetation gt"owth around the edge of the pond which hel[ls to treat stonnwater pollutants and providc:s some wildlife habitat. While it may be possible to . l11eetthe volume requit"ement by reducing the beneh and going to flatter subsurface slopes, the pond would be less elTeetive in treating stonllwatet" pollutants and be more dangerous at the edge. . ~ (612)829-0700.7565 Office Ridge Circle. Eden Prairie, MN 55344-3644' FAX (612)829.7806 I