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ENGINEERED SEPTIC SYSTEM <br /> All of the surrounding properties, as well as this property, were able to find a <br /> permeable membrane within 25' deep seepage pits. I would expect further <br /> exploration would yield an acceptable strata. <br /> The best percolation rate encountered in the limited testing performed was <br /> 125 min/in which equals 0.008 in/min or 11 .5 in/day. Utilizing a conservative <br /> reduction factor of 4%, the actual amount of percolation per day is 0.46 in/day or <br /> 0.038 ft/day. <br /> My design will utilize a filter bed with leach lines on 5-foot centers. The bed <br /> will consist of a 12-inch gravel bed, overlaid with perforated pipe, overlaid with 6' <br /> gravel, overlaid with paper, overlaid with native soil. Seepage pits shall be installed <br /> on a one pit per two line basis with a manifold connecting the lines to the pits. <br /> The bed I am proposing is a 80 foot by 50 foot effective bed. The amount <br /> of percolation by this bed is : 80'x50' = 4000 sq ft x (0.038 ft/day) <br /> = 152 cft/day <br /> = 1 135 gal/day <br /> This is a very conservative system for a four bedroom house. <br />