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c <br />m <br />HC, <br />Cma 4 *t 0^%4 <br />2335 'k/. 7wi 36 <br />S/ P»aU, 55H3 <br />/9w 6f2-636 *600 <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 />Offa a ^ F. <br />Molten M ^uufu. PI <br />Jn\rrK C A f%de*Uk , P I <br />B'odfvfd 4 I t^hr*g. P £ <br />Bn Hard I htrm**. P t\ <br />Jomfi C Otion, P £ <br />&lJF0Mir) <br />Coenn B Cin>k Pf <br />A/i/A a Cfo^dom, P £ <br />f Ao«n«J £ r £. <br />Btfksfd H fove*. P E. <br />Bnben G SikymKht. P £ <br />k4or*»n L io*>ald. P £ <br />Ooftaid C Byritrdt. P I <br />)ttry A Boy^dom. P £ <br />Mtfk A Hkmon. P £ <br />TfdB field P£ <br />kfnkerl 7 Bcytmemm PE <br />Bobtft B PJtJftrIt, P £ <br />Pevtd O Lotkoie. PE <br />CMoftei A Dtckum <br />ito Af Pdwtlsky <br />fia'lai S4 Olton <br />[ '■ <br />Dear Jeanne, <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 information generated on water quality and the <br />quantity of runoff. We would like to utilize that information which 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 />The major items which should be addressed in reviewing the Land Alteration <br />Application are water quality, water quantity, construction procedures and <br />purpose of alteration. <br />Water Quality <br />1. Type of wetland <br />2. Assimilative capacity of each type of wetland <br />3. Time of year alteration to be completed <br />4. Stagnant water potential <br />5. Algae control <br />6. Design configuration of alternation <br />7. Monitoring procedures <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 />8662c <br />Page 1.