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O-P TESTING, INC.Steven B. Schirmers — MPCA Cert. No. 627 <br />951 Katydid Lane NE • St. Michael. MN 55376 • (612) 497-3566 <br />0rb <br />July 19, 1993 <br />Revised August 9, 1993 <br />The Woodlands Inc. <br />2100 Co.Rd.6 <br />Orono, Henn. Co., MN <br />i <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 gal/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 I <br />water use, multiply 1.5 times for pea)< water use = 1117 gal/day. <br />Designed in accordance with the Minnesota Pollution Control Agenc/^ <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 roc)< 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 v/ater <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 neo.'. 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