1986-10-26 Septic System Design and Soil Testing Report

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S -P TESTING, INC. 951 KATYDID LANE ST. MICHAEL, MN 55376 497.3566 STEVE SHIRMERS October 26, 1986 Dale Lindquist 780 No. Brown Rd. Orono, Henn. Co., M,;. This system is designed for a Type 1, five bedroom home and in accordance with the Minnesota Pollution Control Agency standards xPC 40 and local ordinances. The soils on this site are typical of SCS soils napped - FtcC2 - Hayden clay loam. A seasonally high water table was located at 16", 20", & 24", (mottling). This site has an existing failing system due to a strcnj clay soil with a seasonally high water table within 2.5' of the surface. A pressurized mound system would need to be installed but the slope of the land is great- er than 164, which is too steep for a mound system. There is no system that can be installed that will meet state and local codes. In a meeting with the city inspector, the owner and myself, the conclusion was to design a shallow trench system 18" deep with a holding tan< after the last trench with an alarm system. This will be used as an overflow tank if the system cannot ab.orb all the effluent during %he wet seasons. Also recommend to oversize the system as much as possible. The L isting tanks I.:ust be pumped and abandoned (collapse and fill with soil). The soils at a depth of 18" & 24" have a percolation rate averaging 17.6 min/inch and are adequate for treating septic effluent. All neighboring wells are located mora than 100' away from the proposed treatment area. Keep all heavy equipment off of the proposed treatment area before and after construction as much as possible. The treatment area should be mark- ed off before construction. With proper installation and maintenance, this system should have no prob- lem in treating septic effluent effectivel}'- It is recommended that the septic tanks be pumped every 2 years. stc�� II. Schirmers Soil anti percolation Tette Septic System Design SBS/cis