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EXHUT <br />TO: Jeanne A. Mabusth, Zoning Administrator <br />FROM: Michael P. Gaffron, Septic System Inspector <br />DATE: November 6, 1981 <br />SUBJECT: #654 Dicon, Willow Drive South - Subdivision <br />I have reviewed the submitted report for the above referenced <br />proposed subdivision, and wish to make the following comments: <br />The report by Borg indicates high -water -table soils throughout <br />the 6 lots tested. <br />Lot 1 - Slopes of 88, 101. Percolation rates at a depth of <br />25" - 31" averaged 10 mpi in the primary site and 23 mpi <br />for the alternate site. Both sites are acceptable for <br />standard _mound systems. <br />Lot 2 - Slopes of 4-6% in areas tested. Percolation rates <br />averaged 25 mpi in the primary site and 13 mpi in the alternate <br />site. Both sites are acceptable for standard mound systems. <br />Lot 3 - Slopes of 51 - 61 in areas tested. Average percolation . <br />rates averaged 27 mpi for the primary site, and 34 mpi in the <br />alternate site. Both sites are acceptable for standard mound systems. <br />Lot 4 - Slopes of 3-41 in areas tested. Percolation rates <br />averaged 41 mpi in primary site and 20 mpi in the alternate <br />site. Both sites are acceptable for standard mound systems. <br />Lot 11 - Slopes of 8-101 in areas tested percolation rates <br />averaged 40 mpi in the primary site and 31 wpi at the alternate <br />site. NOTE: CARE MUST BE TAKEN TO PLACE THE MOUND ON A <br />SLOPE OF 61 OR LESS ON THIS LOT. <br />Lot 10 - Slopes average 68. Percolation rates averaged 48 mpi <br />on the primary site and 87 mpi on the alternate site. <br />General Comments: Percolation testing was done at a range of <br />depths from 13" to 31". No real correlation appears to exist <br />between depth of testing and percolation rates. The soil <br />borings reflect a seasonably saturated zone beginning at a <br />a range of depths from 1.2 ft to 2.5 ft. Actual current <br />perched water tables were found on some sites at a depth <br />of 3.5 ft. or greater. <br />Based on the above data, the site evaluations recommendation <br />for all mound systems is appropriate. I confirmed the soil <br />boring report with a boring of my own. <br />