1991-003955 - septic system - Laserfiche WebLink

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v � S-P TESTII�G, INC. � 951 KATYDID LANE ST. MICHAEL, MN 55376 497•3566 � � Steven B. Schirmers April 19 , 1991 Keith Swanson 75 Stubbs Bay Rd. ' Orono, Henn. Co. , MN This On-Site Sewage Treatment System is Designed for a Type 1, four bedroom home in.• accordance with the Minnesota Pollution Control Agency Chapter 7080 and local ordinances . (actual three bedroom ) The soils on this site are typical of SCS soils mapped - LrC - Lester loam. A seasonally high water table was located at 52" , 54" & 80" (mottled soil) in the proposed treatment area, SB ' s #3 , 4 ,5 &6 & at 22" & 26" in SB' s #1 & 2 the future expansion area. A shallow trench system may be installed 24" deep. This site is on a 15$ . slope. Due to the slope, recommend to install drain tile upslope of the system to allow the trenches to be an additional 6" deep, (a total of 24") to key the rock into the existing grade. This is needed to keep a 3 ' seperation from the water table. The soils at a depth of 24" in TH' s #3, 4 , 5&6 have a percolation rate , - averaging 17.8 min/inch and are adequate for treating septic effluer�t, . TH' s #1&2 have a percolation rate averaging 12 . 2 min/inch. A pumping chamber will need to be installed to lift the effluent to the treatment area. The power supply and switches must be located outside the manhole and pumping chamber i� a weather proof enclosure. A warning device must be installed with a light and sound device, this is in case of a pump failure. (Mercury floats are a good method) . The supply line pipe must� have back drainage to the pumping chamber. The future expansion area on this site will need to be a Pressurized Mound System on a 10� slope. The existing well is less than 50 ' from the future site & will need to be relocated if the site is needed. All neighboring wells are located greater than 100 ' away from the proposed treatment area. , • � CONT' D Soil and Percolation Teats Septic Srstem Deaign