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S-P TESTING, G, INC. <br />951 KATYDID LANE <br />ST. MICHAEL, MN 55376 <br />497-3566 <br />STEVE SHIRMERS <br />May 28, 1986 <br />Larry Higgins <br />Dakota Avenue WC) <br />Orono, Henn. Co., MN. <br />Long 1-c K v <br />4/? S 16j'L1 <br />This system is designed for a Type 1, four bedroom home and in accordance <br />with the Minnesota Pollution Control Agency standards WPC 40 and local <br />ordinances. <br />The soils on this site are typical of SCS soils mapped - HbC - Hayden loam. <br />This site has had the upper layer of soil removed. The soils indicate <br />mottled soil at 24" to 48", (old mottling). With this being the wettest <br />season and the borings had no standing water, it is my opinion that the <br />water table is no longer present. <br />A shallow system will need to be installed 18" deep with a minimum of 6" of <br />cover over the rock. A pumping chamber will need to be installed and it <br />iL recommended that the system be put under pressure, distribution be <br />handled the same as a mound system. The supply line pipe must have back <br />drainage to the pumping chamber. <br />The power supply and switches must be located outside the manhole and pump- <br />ing chamber in a weather proof enclosure. A warning device must be <br />installed with a light and sound device, this is in case of a pump failure. <br />(Mercury floats are a good method). <br />This site has an existing failing system. The tanks may be used upon <br />approval by the local inslector. <br />The soils at a depth of 1�" have a percolation rate averaging 15.9 min/inch <br />and are adequate for trea ing septic effluent. <br />All neighboring wells are located more than 75' away from the proposed treat- <br />ment area. The well on this site is more than 50' away. <br />This system may need to have the water use lowered if the effluent raises <br />above the rock. The inspection pipe should be installed in the rock layer <br />above the distribution pipe. <br />Keep all heavy equipment off of the proposed treatment area before and after <br />construction as much as possible. The treatment area should be marked off <br />before construction. <br />With proper installation and maintanance, this system should have no problem <br />in treating septic effluent effectively. <br />It is recommended that the <br />2 years. <br />Soil and Percolation Tests <br />Septic System Design <br />septic tanks be pumped every <br />Steven B. Schirmers <br />SBS/ds <br />