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�–� �'�+ 5�� C. Steven B. Schirmers — MPCA Cert. No. 627 951 Katydid Lane NE � St. Michael, MN 55376 • (612} 497-35fi6 August 16 , 1991 Audie Dunham 2280 French Creek Circle Orono, Henn. Co. , Mn This letter is in reguard with the existina On-Site Sewage Treatment ( Pressurized Mound System located on this property. The system is surface discharging at the west end of the rock bed . I inspected the pumping chamber first. A small flow was entering the tank with no water being used in the home in May & August of 1991 . In May tne pump was started which pumped out until the bottom of the pump was exposed . The float switch was not functioning properly. At this time two holes were exposing the rock bed at each end of the rock bed. Effluent raised to approx. 12" from the rock bed to the originai soil . The soils were found to be dry. An additional � boring was bored at an angle into the sand layer below the rock bed to the original soil finding the soil to be dry to moist. Effluent does not appear to be traveling through the sand layer. The sand belo�v tne rock bed appears to be compacted when drilling through the soil profile. A quart jar test was completed with sam�plzs from several depths in 2 locations and does not meet Standards for Mound Construction. A boring was completed into the rock bed. A 18" layer of loam & clay loam soil was found. A 6" layer of topsoil & loamy sand cap � which is required over the rock bed was not found . A layer of hay was found in several borings but paper or filter cloth was not found . With the rock bed being overloaded and saturating the clay cap over the rock bed , the clay soil may have sloughed into the rock bed. The /� rock that was pulled from the rock bed , clay soils were found on the - 11 rock (pressed to the rock) . With the sloughing & possible dirty rocks , the sand layer at the rock bed would be sealed off. Reccomendations for repairing, the system: Finding the rock bed full of septic effluent and the Iayer below the rock bed being dry (very little moisture) , it is apparent that this � system will not function properly. Long term use of the system in it ' s condition will only cause greater failure of the system. The system will need to be replaced from the original soil . CONT ' D