1996-07-10 Septic System Design Report

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S-P TESTING, INC. Steven B. Schirmers - MPCA Cert.No. 627 951 Katydid Lane NE - St. Michael, MN 55376 - (612) 497-3566 FAX (612)-497-5011 State License #394 July 10, 1996 Gary Rebstock 2943 Farview Lane Orono, Henn. Co., MN This on -Site Sewage Treatment System is Designed for a Type 1, five bedroom home designed in accordance with the Minnesota Pollution Control Agency Chapter 7080 and local ordinances. This site has an existing failed Mound System which is surface discharging which is classified as an imminent health hazard and must be replaced or disconnected within 10 months. The system consists of one holding tank with a pumping chamber and a Pressurized Mound System. Soil Borings completed into the existing mound found the system to be full (hydraulically overloaded). The pumping chamber is seeping in ground water which is most likely the cause for the system to be hydraulically overloaded. A Soil Boring 5' downslope near the center of the rock bed found a medium sand, 10 downslope of the rock bed, no sand was found. Soil Borings 5' & 15' downslope at the south end of the rock bed found no sand. A Mound System installed on slopes 6% to 10% would have an absorption area 15' to 24' downslope of the rock bed and would have sand extending downslope to the 15' to 24' length. This Mound System does not meet todays code and will need to be abandoned and a new Mound System installed. The tanks will need to be sealed water tight or abandoned, pumped & filled with soil and new tanks installed. The electrical connections will need to be relocated outside the manhole in a weather proof enclosure. The City requires 2 holding tanks which will require an additional tank to be installed. If the existing pumping chamber can be converted to a holding tank, the new tank may be used as the pumping chamber. The soils on this site are SCS soils mapped - LrB - lester loam. The seasonally saturated soils were located at 22" to 26" (mottled soil). Due to the seasonally saturated soils, a Pressurized Mound System will need to be installed to treat septic effluent. The bottom of the treatment area must be located at least 3' above the saturated soils.