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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 February 8, 1999 -) Mike Sievert 85 Wear Lane North Orono, Henn. Co., MN This on-site sewage treatment system is designed for a Type 1, five bedroom home, in accordance with the Minnesota Pollution Control Agency Chapter 7080 and local ordinances. This site has an existing mound system for a four bedroom home, one additional bedroom is being added. The existing rock bed is 10' x 55' with an approximate lawn area of 49' x 90'. Soil borings completed at the east & west upsiope corners of the rockbed found at least 2' of sand below the rockbed which verifies the existing system is in compliance with the seasonally saturated soil separation. Soil borings and percolation tests, #1A and #2A were completed at the west end of the existing system which verified the soils are not compacted and are suitable for the addition to the system. The addition to the system will be 13' in length and 10' wide. This will be keeping a 10% oversizing for the rockbed. The topsoil fill and approximately 6" of sand will need to be removed with a backhoe with no travel over the additional absorption area. The additional 13' at the west end of the system must be constructed the same as mound construction. The existing system was installed approximately 13' further north than was originally designed. The future expansion site will need approval to be 10' from the property line (City code 20'). The 10' encroachment is upsiope of the rock bed and with the 4%+ slope, the absorption area will be greater than 20' from the property line. The absorption area is from the rockbed downslope. The soils on this site are SCS soils mapped - SwB - Shorewood silty clay loam. The seasonally saturated soils were located at 14" & 18" below the ground surface. 1