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� WestwoodProfessional Services, Inc. . <br /> 104 Marty Drive,Suite 3 <br /> Buffalo,MN 55313 <br /> April 6, 2000 Phone:672-682-2587 <br /> Fax:612-682-2639 <br /> Toll Free:1-888-682-2587 <br /> Email:wpsQwestwoodps.com <br /> K.C. Chermak <br /> 125 Lake St. W. <br /> Wayzata, MN 55391 <br /> RE: Septic System Site Plan for Lot 2, Block 1, WOODEND ACRES, Orono, MN. <br /> Dear K.C.: <br /> This proposed on-site septic system was designed for a 3 bedroom home, with an estimated flow of 450 <br /> gallons per day. Due to mottled soiis at a depth of 28" in the primary site, the primary will need to be a <br /> mound system with 12" of sand under the rockbed at the upslope side. The site in which this system is <br /> proposed has a average existing ground slope of 6%, and percolation rates ranging from 12-16 MPI. The <br /> rock bed size will be 10 feet wide and 38 feet long with the overall dimensions of the primary mound <br /> being 30.8 feet long and 56.0 feet wide. <br /> A secondary septic system has been shown on the plan. This system will also need to be a mound <br /> system. This system is laid-out on a average slope of approximately 8%. The city of Orono only allows <br /> systems to be installed on 6% or less slopes. Over half of the secondary mound's down slope dike is on <br /> a six percent slope but the average slope over the mound is 8%. A portion of this site has been driven <br /> over and resulting in compacted soils and slow percolation. I would recommend completeing <br /> numerous perc tests in this area to better delineate the disturbed area. I feel if additional testing verifies <br /> that only a small area of the absorption area is disturbed it would be suitable for a mound if it is <br /> installed as shown on the plan and the soils in the disturbed area are scarified to the maximum allowed <br /> depth below the ground surface. This system will not need to be constructed unless the primary mound <br /> fails. <br /> Certain precautions will need to be made to further protect the areas in which the above referenced <br /> septic systems are proposed. Both primary and alternate septic areas have been or will be staked off. It <br /> is critical that the soil is not disturbed before, during, and after construction of the system. <br /> Designing[he Future Today..since 1972 <br />