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Westwood Weilen Associates <br />Westwood Profossional Services. Inc.lT <br />lofZ <br />3701 12m Street Norm <br />Suite 206 <br />St Cloud. MN S6303 <br />June 8,2000 <br />Phone: 320-2S3-949S <br />Fai: 320-2$3 0737 <br />Toll free: 1-600 270-949S <br />Email wpt#westwoodps com <br />Thomas Graham <br />1065 Tamarack Drive <br />Orono, MN SS3S6 <br />RE: Septic System Site Plan for Lot 3, Block I, UNDERHILL FARMS, Hennepen County. <br />Dear Thomas: <br />This proposed on-site septic system was designed for a 4 bedroom home with an estimated flow of 600 <br />gallons per day. Due to mottled soils at a depth of 12” in the septic site area, the system will need to be <br />a mound system with 24 ” 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 10% and percolation rates ranging from 17.1-24.7 MPI. <br />The rock bed size will be 10 feet wide and SO feet long with the overall dimensions of the mound being <br />70 feet long and 37.8 feet wide. Two 1000 gallon septic tanks and a 1000 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 wilt 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^ptic area should be staked off with visible fencing prior to construction. <br />This system should treat the septic efnuent 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, dius <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. I can be reached at <br />(612) 682-2587. <br />Sincerely, <br />Bemie Miller <br />Septic Site Designer <br />MPCA Lie. No. 43 ar 4. <br />■7 rr.i <br />\ <br />\ <br />C«*v :iH* iifi.gi* ii4Ltf