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S-P TESTING, INC.Steven B. Schinmers • MPCA Cert. No. 627 <br />951 Katydid Lane NE • St. Michael. MN 55376 • (612) 497-3566 <br />FAX(612)-497-5011 <br />State License #394 <br />February 4, 1998 <br />Alex & Cathy Johnson <br />940 So. Brown Rd. <br />Orono, Henn. Co., MN <br />This site has an existing on-site sewage treatment system which is classified as failed <br />due to not meeting a 3' separation from the bottom of the system and the saturated soil. <br />The system was not installed in the area of the original Design completed by S-P <br />resting, Inc. dated September 10.1984. Approximately 75% of the system is out of the <br />area tested which indicated mottled soil at SB#5 at 34" below the ground surface. An <br />addition to the house is proposed which will require the system to be upgraded. <br />Soil borings completed in the area of #1 , 2 & 3 found the mottled soil changed & at a <br />higher elevation than in 1984. This may be caused by the sandy soils in the soil profile <br />being saturated during a very wet period in the late 1980's. <br />This on-site sewage treatment system is designed for a Type 1 , 5 bedroom home & 1 <br />bedroom guest house in the bam totaling 6 bedrooms, in accordance with the Minnesota <br />Pollution Control Agency Chapter 7080 and local ordinances. <br />The soils on this site are SCS soils mapped - HbC - Hayden loam. The seasonally <br />saturated soils were located at 28" to 60" (mottled soil). Due to the seasonally saturated <br />soils, a Pressurized Mound System will ne^ to be installed to treat septic effluent. The <br />bottom of the treatment area must be located at least 3* above the saturated soils. <br />The soils at a depth of 12" have a percolation rate averaging 12.6 mpi. <br />1 <br />9