1982-10-27 Septic System Design Report

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EXl-l; L • TO: Jeanne A. Mabusth, Zc)niny Administrator FROM: Elichael P. Gaffron, Septic System Inspector DATE: November 6, 1981 SUBJECT: #654 Dicon, Willow Drive South - Subdivision I have reviewed the sub -fitted report for the above referenced proposed subdivision, and wish to make the following comments: The report by Borq indicates high -water -table soils throughout the 6 lots tested. Lot 1 - Slopes of 8%, lOc. Percolation rates at a depth of 25" - 31" averaged 10 mpi in the primary site and 23 mpi for the alternate site. Both sites are acceptable for standard mound systems. Lot 2 - Slopes rf 4-6% in areas tested. Percolation rates averaged 25 mpi in the primary site and 13 mpi in the alternate site. Both sites are}""-"'A-mnund systems. Lot 3 - Slopes of 5% - 6$ in areas tested. Average percolation rates averaged 27 mpi for the primary site, and 34 mpi in the alternate site. Both sites are acceptable for standard mound systems Lot 4 - Slopes of 3-4% in areas tested. Percolation rates averaged 41 mpi in primary site and 20 mpi in the alternate site. Both sites are acceptable for standard mount'. systems. Lot 11 - Slopes of 8-10% in areas tested percolation rates averaged 40 mpi in the primary site and 31 mpi at the alternate site. NOTE: CARE MUST BE TAKEN TO PLACE THE MOUND ON A SLOPE OF 6% OR LESS ON THIS LOT. Lot 10 - Slopes average 6%. Percolation rates averaged 48 mpi on the primiry site and 87 mpi on the alternate site- General C%tranents: Percolation testing was done at a range of depths frim 13" to 31". No real correlation appears to exist between depth of testing and percolation rates. The soil borings reflect a seasonably saturated zone beginning at a a range of depths from 1.2 ft to 2.5 ft. Actual current perched water tables were found on some sitesdepth of 3.5 ft. or greater. Based on the above data, the site evaluations recommendation for all mound systems is appropriate. I confirmed the soil boring report with a boring of my own.