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Mr. and Mrs. Dean K. Molin <br />Page TWo <br />August 8, 1978 f <br />Percolation Test Hole <br />Percolation Rate <br />Minutes/Inch <br />11 <br />240 <br />18 <br />11 <br />20 <br />14 <br />Because of the groundwater conditions and percolation in the vicinity of <br />the existing drainfield it is suggested that the present system be abandoned. <br />See Figure 1. It is also recommended that a conventional system be installed <br />in the vicinity of percolation test holes 3, 4, 5 and 6. The average rate <br />of percolation for these test holes is 18 minutes per inch. See Figure 2 <br />for location. <br />The wastewater flow for a three bedroom house is 450 gallons per day. A <br />wastewater flow of this volxune requires a septic tank with a 1,000 gallon <br />liquid limit. However, it is suggested that the existing tank be pumped <br />and that an additional 1,000 gallon tank b«p installed and connected in <br />series with the existing tank. . The dual septic tank system is recommended <br />because if the proposed drainfield site is utilized as shown on Figure 2 <br />it will be necessary to punq> the effluent to the dr2d.nfield. <br />The drainfield requirement for a wastewater load of 450 gallons per day <br />and a percolation rate of 18 minutes per inch is 751 square feet. The <br />square footage requirement could be obtained by installing four laterals <br />with a width of 3 feet and a length of 64 feet. See Figure 2. <br />It can be theorized that the existing system failed either because of <br />ten^orary high groundwater levels or variable percolation rates as <br />indicated by the 240 minutes per inch recorded at P2. <br />If you have any cpiestions please do not hesitate to contact me< <br />SincerelyI <br />SOLOM, INC. <br />Marcxis C. Hannaman <br />Soil Scientist <br />MCH/cmk <br />Enclosures