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�-F TESTING� ll�C. Steven B. Schirmers — MPCA Cert. No. 627 <br /> 951 Katydid Lane NE • St. Michael, MN 55376 • (612) 497-3566 <br /> July 19 , 1993 <br /> Revised August 9 , 1993 <br /> The Woodlands Inc. <br /> 2100 Co.Rd. 6 <br /> Orono, Henn. Co. , MN <br /> This On-Site Sewage Treatment System is Designed for a Group Home <br /> with 6-1 bedroom units at 100 gal/day plus 5 staff at 15 gal/day <br /> = 675 ga1/day. The water meter indicates an average water use of <br /> 865 gal/day with the water softner putting out 120 gal/day (244 <br /> gal/recharge every 2 days) . The total water use is 745 gal/day <br /> without the water softner. When sizing the system using a metered <br /> water use, multiply 1.5 times for peak water use = 1117 gal/day. <br /> Designed in accordance with the Minnesota Pollution Control Agency <br /> Chapter 7080 and local ordinances . <br /> The soils on this site are SCS soils mapped - HcB2 - Hayden clay <br /> loam. A seasonally high water table was located at 22" to 30" <br /> (mottled soil ) . Due to the seasonally high water table, a <br /> Pressurized Mound System will need to be installed. The bottom <br /> of the rock bed must be located at least 3 ' above the seasonally <br /> high water table. <br /> This site has an existing failing trench system due to the strong <br /> clay soils with a high water table. The existing tanks may be <br /> used upon approval by the local Inspector. Due to all the water <br /> going through a pump in the lower level , recommend to increase <br /> the tank capacity with one additional 1500 gallon tank in front <br /> of the existing 3-1000 gallon. <br /> The soils at a depth of 12" have a percolation rate averaging <br /> 8.9 min/inch. Test Holes #4 & 5 are compacted and must not <br /> be used. <br /> A pumping chamber will need to be installed to lift the effluent <br /> to the 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 /> CONT' D <br />