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COUNC'l1. tvi STING <br />,/ <br />juU.J N4 10-5 <br />9 Y OF 0R0N0 <br />---- -- - -------- -- -- - ---- lino 1, s~wou. P E <br />rRoN„ M Rnwnt. P f <br />� IuuPA r 1 ndr.iJ. P t <br />- 2335 7U. •1.... c _ - - --- -- — R,ad/a,d 4 I —tw's, P I <br />A, hold I I r,ne,. P I <br />SI /) . J M.--- -•- 55113 Jmen C noon. P E <br />/9I,e,.. 611.636 4600 <br />June 20, 1985 <br />City of Orono <br />Box 66 <br />Crystal Bay, MN 55323 <br />Attn: Ms. Jeanne Mabusth <br />Re: File No. 139 <br />Wetland Alterations <br />Dear Jeanne, <br />6iene R ( nd, I' f <br />An,1 A Awdon, P E <br />TAonw E Nn,ri. P E <br />X. hold M' fo,w. P f <br />*,,bell (. S, howrrh,, P E <br />No...n l Snr,afo. P E <br />Ik nald( B-gard,, Pf <br />If— A Bu.•Aon, P E <br />Male A Ilan,.., P E <br />Ied A Irt,d P E <br />Mu ",1 7 Rau,wann P I <br />R,fv,i P. P/tffe,k. P f <br />lv.,d O loituro, P I� <br />CMok, A EiKUon <br />I ru N Pawbt), <br />.bon <br />The purpose of this letter is to develop criteria for staff to utilize in the <br />review of wetland alternation applications. The city has received several re- <br />quests over the past two years for developing wildlife and/or decorative <br />ponds. The alternation of wetlands raises two primary environmental concerns; <br />water quality change and water quantity change; and the ultimate effect on <br />Lake Minnetonka. <br />There has been a great deal of infor•nation generated u.L water quality and the <br />quantity of runoff. WE could like to utilize that information dhich is con- <br />sistent with the Orono philosophy for protecting Lake Minnetonka. The exist- <br />ing City ordinance provides for a conditional use permit for dredging or exca- <br />vating of material from any lake bed, or wetland or land adjacent thereto. <br />;he major i:,.- ..ch should be addressed in reviewing the Land Alteration <br />Application are w quality, water quantity, construction procedures and <br />purpose of alteration. <br />Water Quality <br />1. Type of wetland <br />2. Assimilative capacity of <br />3. Time of year alteration <br />4. Stagnant water potential <br />5. Algae control <br />6. Design cunfiguration of <br />7. Monitoring procedures <br />each type of wetland <br />to be completed <br />alternation <br />Water Quantity <br />1. Design storm return frequency (100 year) <br />2. Overflow control device <br />3. Watershed characteristics <br />4. Retention time <br />Page. 1. <br />8662c <br />