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41891.27oi Mark E. Serahardscn, City Administrator <br />Wrcmt Michael P. Gaffron, Asst Planning & Zoning Administrator <br />Oatas April 18, 1991 <br />Subjects Stubbs Bay Sewer <br />List of Bxbibits - <br />A - Staff Memo of 4/3/91 <br />B - Bemhardson's Memo & Exhibits of 2/28/91 <br />Issues - <br />A) Ziesmer situation - possible additional options. <br />B) Sewer project - process for decision. <br />Dlscossioo - <br />A) Ziesmer Situation <br />Council will recall that the Ziesmers have reached a <br />financial point where they must complete installation of their <br />mound system or be assured that municipal sewer will be available <br />for connection in a reasonable period of time. To date, staff <br />has not discussed the interim option of constructing a small <br />trench drainfieli in the front yard, using gravity flow, which <br />while not meeting code requirements, might provide some relief <br />yet not create an immediate pollution or health hasard. This <br />option has been previously used in Stubbs Bay for interim repairs <br />to an existing system, but not for a new home. Mr. Ziesmer notes <br />he likes this possibility. <br />The neighbors on either side of the Ziesmers have trench <br />drainfields in their front yards, and neither system is failing. <br />It is very possible that soil testing would show that they should <br />have been mound systems by todays standards, due to a seasonal <br />perched water table evidenced by "mottling*. In our loam and <br />clay loam soils. Dr. James L. Anderson of the U. of M. Extension <br />Service states that trenches less than 3* above the perched water <br />table will likely have a shortened useful life. However if you <br />can get the water to move through the clayey soils, treatment <br />should be very adequate. <br />The M.P.C.A. takes a slightly different line, suggesting <br />that during the times when perched water tables exist just below <br />or around a trench system, all treatment stops. Therefore, the <br />M.P.C.A. staff has admonished the DNR staff that in shoreland <br />areas, existing trench systems less than 3* above the mottling <br />sone should be considered as non-conforming systems and be <br />replaced with fully conforming systems. Staff will be reviewing <br />these somewhat conflicting interpretations as part of the <br />shoreland ordinance.