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Westwood Wellen Associates <br />Westwood Professional Services. Inc. <br />June 8,2000 <br />Thomas Graham <br />I06S Tamarack Drive <br />Orono, MN 55356 <br />3701 l?ih Noilli <br />'‘Uiic 206 <br />Si L.oud. MN S6303 <br />Phone 320-253-9495 <br />f.it 320 253 8737 <br />Toll Free 1 800 270 9495 <br />Email wp5'-tw<»Mwoo<Jps com <br />RE: Septic System Site Plan for the proposed north 2 acres of Lot 3, Block I, UNDERHILL FARMS, <br />Hennepin County. <br />b <br />Dear Thomas: <br />This proposed on-site septic system was designed for a 5 bedroom home with an estimated flow of 600 <br />gallons per day. Due to mottled soils at a depth of 19 ” in the septic site area, the system will need to be <br />a mound system with 17 ” 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 16-25.3 MPI. <br />The rock bed size will be 10 feet wide and 60 feet long with the overall dimensions of the mound being <br />87 feet long and 41.5 feet wide. Two 1300 gallon septic tanks and a 1300 gallon pump tank will be <br />required for this septic system. <br />Based on our evaluation there is adequate room on the property for a alternate septic site. The alternate <br />septic system also is shown and designed. This septic site will also need to be a mound, it can be used in <br />the event of the primary mound failing <br />Certain precautions will need to be made to protect the area in which the above referenced septic <br />systems are proposed. It is critical that the soil is not disturbed before, during, and after construction of <br />the system. The septic area should be staked off with visible fencing prior to construction. <br />This system should treat the septic effluent effectively if the system is installed properly and is <br />maintained properly. It is recommenced that the septic tanks be pumped every two years. This will <br />reduce the chance of solids reaching the mound system. It is also recommended not to use excessive <br />amounts of chlorine, soaps, and anti-bacterial products which can kill bacteria in the septic tanks, thus <br />causing the system to fail. This bacteria is needed to treat the septic effluent. <br />If you have any questions in regards to this design, I will be happy to answer them. 1 can be reached at <br />(612)682-2587. <br />Sincerely, <br />' .N <br />Bernie Miller <br />Septic Site Designer <br />MPCA Lie. No. 43 <br />j <br />.V <br />■.V