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Mr. Gary McEnemey L <br /> August 12,2002 <br /> Page 2 <br /> Joaquin County Public Health Services,Environmental Health Division(SJC PHS-EHD). No deep <br /> percolation tests were performed. <br /> Percolation Test Summary <br /> Standard San Joaquin County Percolation Test Method Utilized <br /> Wsite) <br /> ft) Date Tested Percolation(Rate) <br /> 5-7-02 no percolation <br /> 5-7-02 250 min/in <br /> N2, <br /> 8-1-02,additional test 222 min/in <br /> 8-1-02,additional test 125 min/in <br /> 3,(proposed site) 3.0 8-1-02, additional test 250 min/m' <br /> Interpretation of the percolation rates measured at the proposed home site indicates that the <br /> shallow soil zone has limited percolation potential. The deep percolation poteniial at the proposed leach <br /> field site was not tested but is probably limited based on deep drilling experience with this project. <br /> Therefore,the system will be designed on a shallow percolation rate of 250 min/inch. The proposed <br /> engineered septic system design will be sized to dispose of the effluent entirely into shallow leach lines. <br /> Seepage pits should be used and will add some absorption capacity and overflow protection for periods <br /> of high use. <br /> The conceptual septic system will be leach lines and seepage pits very similar to a typical San <br /> Joaquin County septic system. A 100%replacement area is required and should be located adjacent to <br /> the proposed septic system disposal if possible. The location of the 100% replacement area should be <br /> designated by the property buyer. <br /> The leach field area and 100%replacement area are to remain unbuilt(structure), unpaved, and <br /> cannot be used for any vehicle parking or animal correl. Landscaping consisting of grass, flowers,or any <br /> non"woody"plants is encouraged for the leach field area. Trees can be planted next to the leach field <br /> with a set-back of 20 feet from the closest point of the leach trench or seepage pit. <br /> H. Design Calculations <br /> Shallow Leach Lines: <br /> Disposal of effluent will be in shallow leach lines. A sewage loading equation was obtained <br /> from the Manual of Septic Tank Practice(1967)was used to determine the sewage loading rate. On Page <br /> 47,Figure 19 of the Manual of Septic Tank Practice,the relationship between the percolation rate <br /> (minutes per inch) and the allowable rate of sewage application(gallons per day per square foot) is <br /> O,J�4 <br />