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• S-P TESTING, INC. Steven B. Schirmers & Debra M. Schirmers <br /> 951 Katydid Lane NE - St. Michael, MN 55376 - (612) 497-3566 <br /> FAX (612) 497-5011 <br /> State License#394 <br /> June 2, 1998 <br /> Mike Arne <br /> 125 Truffula Trail <br /> Orono, Henn. Co., MN <br /> This letter is in regard with the existing pressurized mound system located on this <br /> property that was constructed on 10-3-1997. <br /> The system has surface discharge at the east toe of the mound. Soil borings through <br /> the sand at the northeast and southeast comer of the system found ponding in the sand. <br /> A boring found the sand 14' from the rockbed to the toe of the absorption area at the <br /> center of the mound. At the north end of the rock bed the sand was found 12' to the <br /> absorption area. The design on record at the City shows a minimum of 17' & 19' overall <br /> The sand must be extended to meet code for an adequate absorption area. <br /> Inspecting the tanks, each manhole shows evidence of ground water seepage at the <br /> riser. The manhole risers will need to be removed and resealed at the top of the tanks. <br /> All of the inlet and outlets must also be checked for possible seepage. An event counter <br /> was temporarily installed to monitor water use. A counter must be installed permanently <br /> to monitor and to assure that all seepage has been stopped. <br /> The surface run-off was diverted around the system, after the problem occured_ .The <br /> run-off plus the seepage from the tanks would overload a mound system. The rock bed <br /> was not hydraulically overloaded. The system may recover over time after the repairs <br /> are made. If the overloading in the sand bed remains, a new mound system may need <br /> to be installed. Surface discharging is an imminent health hazard and must be repaired <br /> or disconnected within 10 months. <br /> Steven B. Schirmers <br /> 1 <br />