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Consulting Engineers <br />(612) 475-0858 <br />We nek Associates. Inc <br />June 16, 1987 <br />Ms. Debra Page <br />Lindquist and Vennuin <br />4200 IDS Center <br />80 South Eighth Street <br />Minneapolis, MN 5S402 <br />Re: Olai Hanson <br />1390 Railroad Avenue <br />Orono, Minnesota <br />Dear Ms. Page: <br />I have inspected the referenced property relative to the placement <br />of the proposed garage in relation to a former septic tank system <br />and drainfield. <br />The enclosed Figure 1 shows the relative location of the proposed <br />garage to these former sanitary waste treatment facilities. While <br />the septic tanks were removed, there still exists the potential for <br />gases to be generated at this location and it is not advisable to <br />construct a concrete garage floor over such an area. The <br />drainfield was not removed and the same potential exists in this <br />area for the generation of gases. <br />In addition, if the proposed garage were shifted over the septic <br />tank location, the area where the septic tanks were located would <br />need to be excavated, filled with proper foundation material and <br />recompacted to prevent the garage footings and floor slab from <br />settling. It is estimated that this work would cost the owner <br />approximately $1,500 - $2,000. <br />It is, therefore, concluded tliat it is not advisable to move the <br />proposed structure either to the .south or the west. <br />If you have any questions on this matter please feel free to call <br />me. <br />Sincerely, <br />_ _iiENCK ASSOCIATES, INC. <br />Norman C. Wenck, P.E. <br />NCW/cmk <br />Enclosure <br />832 Twelve Oaks Center <br />15500 Wayzala Blvd <br />Way/ala MN 55391