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CITY of ORONO <br /> Post Office Box 66•Crystal Bay,Minnesota 55323•Municipal Offices <br /> s <br /> � . � � On the North Shore of Lake Minnetonka <br /> June 29, 1987 <br /> Martha Head <br /> 2090 Shoreline Drive <br /> Wayzata, MN 55391 <br /> Re: Review of sewage system possibilities <br /> Dear Mrs. Head: <br /> In regards to your request for consideration of installing an on-site <br /> sewage treatment system on your property, I would make the following <br /> comments : <br /> 1. The two major limitations to installing such a system are as <br /> follows: <br /> a) All components of system must be at least 75' from the <br /> lakeshore or any wetland areas. <br /> b) Vertical separation between the bottom of the drainfield <br /> system and the highest known seasonal water table must be at <br /> least 3'. <br /> 2. As we discussed, the only area on your property that might be <br /> suitable for a trench-type drainfield is the portion of hillside just <br /> north of the main structure. This area would, however, provide only a <br /> minimal area for drainfield, perhaps only two lines at most, each <br /> being about 30' long and 2-3 ' wide. Depending on the actual <br /> percolation rate, this approximately 150 s.f. bottom area might be <br /> expected to handle anywhere from 70-180 gallons per day. I would <br /> caution you that this is an estimate only, and we would require that <br /> you have the site tested and find an installer to verify that such a <br /> system can be physically installed on that steep slope. I think its <br /> rather "iffy". <br /> 3. Probably a better solution that will provide greater capacity <br /> would be a mound-type drainfield that might be possible to develop on <br /> f lat ground to the east. Again we would require soil testing and a <br /> design that accounts for the high water table concerns. You should be <br /> aware, though, that as we have done with the various properties <br /> similarly situated on Brackett's Point, the system may not be placed <br /> in a f lood plain area, i.e. areas below elevation 931.5' MSL. We <br /> would need verification of elevations on the property. <br /> BU[LDIIVG Jt ZONING—473-7357 • ADMIlVISTRATION dk FINANCE—473-7358 • PUBLIC WORKS—473-7359 <br /> ASSESSING <br />