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I H. KH I�.! IIDER x ASX)(IAII File No . S-2008-1 <br /> December 21, 1972 <br /> PAGE FIVE <br /> characteristics of the soils . The tests performed included <br /> Moisture Content and Dry Density Determinations and Hydrometer <br /> Analyses . The results of these tests are summarized on the <br /> Logs of Borings and on Table II, respectively. <br /> RECOMMENDED PERCOLATION VALUE <br /> The percolation rates measured in the tests range from <br /> approximately 5 minutes per inch to approximately 21 minutes <br /> per inch . Based on our evaluation of the soils in which these <br /> percolation tests were performed, it is our opinion that the <br /> measured percolation rates are too rapid for this clay soil . <br /> It is possible that the test values were influenced by the <br /> loose condition of the surface soil, or possibly by the tree <br /> root systems . We have selected a value of 20 minutes per <br /> inch as being most nearly representative of the percolation <br /> rate of this soil . <br /> Using a value of 20 minutes per inch, the suggested <br /> allowable rate of sewage application given by the "Manual of <br /> Septic Tank Practice ," U . S . Department of Health, Education <br /> and Welfare , is approximately one gallon per square foot per <br /> day. We recommend that this value of one gallon per square <br /> foot per day be used in your design. <br /> LIMITATIONS <br /> This report is prepared from our field experience , labora- <br /> tory tests , and our understanding of the proposed construction. <br />