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s <br /> � ' ��P TES TI NG� �NC. Steven B. Schirmers • MPCA Cert.No. 627 <br /> 951 Katydid Lane NE • St. Michaei, MN 55376 • (612) 497-3566 <br /> FAX (612) 497-5011 <br /> State License#394 <br /> _ =���_'�:� <br /> "''"�.; � � 1999 <br /> November 29, 1999 <br /> C:��Y ur �:t�;a�1;'O <br /> ANCO Construction <br /> 1720 North Farm Rd. <br /> Orono, Henn. Co., MN <br /> This site has an existing on-site sewage treatment system which is Gassified as failed <br /> due to not meeting the required 3' separation from the bottom of the system and the <br /> saturated soil. Soil borings into the system found the top of the rock at 12" to 18" below <br /> the surFace with the bottom of the rock 30"to 36" below the ground surface. The <br /> original tests and design compieted by S-P Testing, Inc. on June 12, 1984 logged <br /> rr�ottled soil at 4-1/2' below the ground surface and the system was designed with the <br /> bottom 18" below the ground surFace. The system was also installed downslope of the <br /> original tests. <br /> This On-Site Sewage Treatment System is Designed for a Type 1, 6 bedroom home, (3 <br /> at present - adding 3) in accordance with the Minnesota Pollution Control Agency <br /> Chapter 7080 and local ordinances. <br /> The soils on this site are SCS soils mapped - LrC - Lester loam. The seasonally <br /> saturated soils were located at 34" to 54". The bottom of the treatment area must be <br /> located at least 3' above the seasonally saturated soits. An At-Grade system may be <br /> installed for the proposed site. Two At-Grades will be installed side by side with equal <br /> distribution on the slopes, see attached work sheet. A pressurized mound system will <br /> be needed for the future expansion site. <br /> The At-Grade System wil! need to be on a 7�o slope which will requir�e City approvat, a <br /> maximum of 6% is required. The future site is on a 7.5% slope and will need to be 10' <br /> from the property line along Co.Rd.6 which will also require approval from the City of <br /> Orono. <br /> 1 <br />