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Engineered Septic System <br /> The proposed leach field area narrowly failed passing acceptable percolation <br /> rate. (62.5 minutes versus 60.0 minutes) All of the surrounding parcels were able <br /> to find a permeable membrane within 25 feet deep. I would expect with further <br /> exploration, this property would support a conventional leach line and pit system. <br /> Since a strata was not encountered, this report will design a theoretical system for <br /> a future home. The theoretical home this strata will consider is a two bedroom <br /> house. The parcel that did not pass has a home and septic system with pits. It <br /> has encountered no problems in its ten years of existence. <br /> The percolation rate is 62.5 min/in which equals 0.016 in/min or 23 in/day. <br /> Utilizing a 4% factor (which is very conservative), the actual amount of percolation <br /> per day is 0.92 in/day or 0.076 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" gravel bed, overlaid with perforated pipe, overlaid with 6" <br /> gravel, overlaid with paper, overlaid with native soil. <br /> The bed I am designing is a 30 foot by 40 foot effective bed. The amount of <br /> percolation by this bed is: 30'x40' = 1200 sq ft x (0.076ft/day) <br /> = 91 .2 cft/day —�6 f� <br /> = 682 gal/day F,3& <br /> This is more than sufficient for a two bedroom house. <br />