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• <br /> P TESTING, I1 TC. Steven B. Schirmers -- N PCA Cert. No. 627 <br /> 951 Katydid Lane NE • St. Michael, MN 55376 • (612) 497-3506 <br /> July 21, 1992 <br /> Jack Hawes <br /> 2095 Weber Hills Rd. <br /> Orono, Henn. Co. , MN <br /> This site has an existing failing system with surface discharge. The <br /> system consists of 2 tanks with 3 trenches approx. 250 lin.ft. = <br /> 500sq.ft. Soil borings into each trench indicated effluent was <br /> entering each trench. If the soils would be adequate for a Trench <br /> System, 900sq.ft. would be needed for this site. Soil Borings <br /> indicated mottled soil (seasonally high water table) at 18" to <br /> 56" deep. To adequately treat septic effluent, a Pressurized <br /> Mound System will need to be installed. FILL SOILS were encountered <br /> in the area of Soil Boring #2, this does not meet State & local <br /> codes . This site has limited area available for the treatment of <br /> septic effluent, and the area by Soil Boring #2 will be needed. <br /> Percolation tests were completed through the fill soil , 12" into <br /> the original soil to verify the soils are not compacted. Recommend <br /> to remove the fill soil with a backhoe to the original soil . Using <br /> the FILL SOIL area does not meet State & City codes & must be approved <br /> by the City prior to construction. Also approval to be within 10 ' <br /> of the property line will be needed. The existing tanks are old <br /> block type & will need to be abandoned, pumped & filled with soil . <br /> This On-Site Sewage Treatment System is Designed for a Type 1, four <br /> bedroom home in accordance with the Minnesota Pollution Control <br /> Agency Chapter 7080 and local ordinances . <br /> The soils on this site are SCS soils mapped - HbB - Hayden loam. <br /> The soils at a depth of 12" have a percolation rate averaging <br /> 8. 6 min/inch and are adequate for treating septic effluent. <br /> A pumping chamber will need to be installed to lift the effluent to the <br /> treatment area. <br /> The manifold and supply line pipe must have back drainage to the pumping <br /> chamber. The distribution pipes shall have their ends capped. Be sure <br /> the rock and sand fill material are clean. The sod layer below the <br /> entire mounded area must be turned over, just break up the sod, be sure <br /> not to over work. <br /> The power supply and switches must be located outside the manhole and <br /> pumping chamber in a weather proof enclosure. A warning device must <br /> be installed with a light and sound device, this is in case of a pump <br /> failure. Mercury floats are a good method. <br /> CONT' D <br />