1982-08-23 Septic System Design Specifications

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> \. 4 TOM SMITH ASSOCIATES ine Consulting Enginsors August 23, 1982 Doug Sjoberg 775 South Brown Road Orono, MN SubjectI Percolation test results and onsite sewage disposal desipi reconunendations, n9io In response to your authorization we have condwcted percolation tests on your proj^erty at 775 South Brown Road, This report preser.ts our results and recommendations for construction of a new system on tlie prenises, T!iu need for these teats and consideration of a nc\/ s; sto,n has been prompted by the inadequate functioning of the existing system in the wooded area, on the north slope to the north of the l.ouse. The area tested is to the vast of the existing system, situated on a north facing slope on open ground. The slope is aprroximately 12^ and is covered mostly by grass. Specific location of the soil boring and percolation tests are shown on the attached sketch. One soil boring to a total depth of seven feet, and two percolation tests were run. Surface alev.tions between the two percolation test locations was approximately’ h l/2 feet. RKULTS ffie soil encountered was primarily a sandy clay with a surface ccvcring of clayey silt topsoil. No mottling or evldaucc of ^X'^'indwater was encotntnred to a total depth of seven feet. The percolation rates determined were 20 and 27 minutes per inch in the two test holes. The soil boring log and percolation test data sheets are attached. RECOMMENDATIONS It is our rccormendatlon that a percolation rate of *7 minutes per inch bo used in designing the onsite sewage system at t! i-.. property. According to Information furnished by you, the existln:' house is essentially a tiace bed room home* We recommend considering a system desi-Tied for a Type I residence, as it is likely that more than two major water using appliances are, or will be installed during the probable useful life of this system* 5109 Kimberly Roed, Minnetonlte, Minnesota 55343 16121 934*80^'- 4" ’ •