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8*) <br />ipll <br />TO: File <br />FROM: Mike Gaffron, Septic System Inspector <br />DATE: June 15, 1978 <br />RE: Additional Soils & Septic System Location Data for <br />Stielow Subdivision - 565 Leaf Street <br />A nunber of lots in this subdivision were retested to find more <br />suitable locations and soils for on-site sewage treatment systems. <br />Lot 1 - The problem on this lot is a very high water table. <br />Hr. Stielow*s engineering firm has proposed an innovative mound/ <br />fill type system utilizing draintile to lower the water table. <br />Slopes on the drainfield site are greater than allowable and <br />would be remedied by terracing. This system must have approval <br />of the city engineer prior to issuance of a building permit. <br />Lot 4 - Revised percolation rate 22 min./inch; 34 min./inch at <br />secondary site. Seasonal water table at 4 to 5 feet. A system <br />of very shallow trenches or a mound would be required for this <br />lot. <br />Lot 9 - Revised percolation rate 15 min./inch; 78 min./inch at <br />secondary site. Water table at 3 to 5 feet. Very shallow trenches <br />would be allowable on the primary site. The secondary site would <br />a mound. _ _ _ _ _ _ <br />Lot 11 - Revised percolation rate 15 min./inch; 44 min./inch at <br />secondary site. Seasonal water table at 2% ft. A mound system <br />would be required for both sites because of high water table. <br />"SUAiitaLy: With the exception of Lot 1, all lots in the proposed <br />subdivision appear to have suitable soils and locations for on-site <br />sewage treatment. Lot 1 will require some landscaping and de­ <br />watering for the proposed mound/fill system to work effectively. <br />This should be carefully reviewed by the city engineer.