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Mr.Gary McEnemey August 12,2002 Page 2 Joaquin County Public Health Services, Environmental Health Division(SJC PHS-EHD). No deep percolation tests were performed. Percolation Test Summary Standard San Joaquin County Percolation Test Method Utilized Name Test Depth(ft) Date Tested Percolation(Rate) 1 3.0 5-7-02 125 min/in 2 3.5 5-7-02 50 min/in 3 14.5 5-7-02 125 min/in 1,(proposed site) 3.0 8-1-02,additional test 83 min/in 2,(proposed site) 3.0 8-1-02,additional test 50 min/in. Interpretation of the percolation rates measured at the proposed home site indicates that the shallow coil zone has limited percnlatinn Fnntentia1. T12P deep ne nla inn potential at the proposed leach field site was not tested but is probably limited based on deep drilling experience with this project. Therefore, the system will be designed on a slowest shallow percolation rate of 125 min/inch. The proposed engineered septic system design will be sized to dispose of the effluent entirely into shallow leach lines. Seepage pits should be used and will add some absorption capacity and overflow protection for periods of high use. The conceptual septic system will be leach lines and seepage pits very similar to a typical San Joaquin County septic system. A 100%replacement area is required and should be located adjacent to the proposed septic system disposal if possible. The location of the 100%replacement area should be designated by the property buyer. The leach field area and 100%replacement area are to remain unbuilt(structure), unpaved,and cannot be used for any vehicle parking or animal correl. Landscaping consisting of grass,flowers,or any non"woody"plants is encouraged for the leach field area. Trees can be planted next to the leach field with a set-back of 20 feet from the closest point of the leach trench or seepage pit. IT. Design Calculations Shallow Leach Lines: Disposal of effluent will be in shallow leach lines. A sewage loading equation was obtained from the Manual of Septic Tank Practice(1967)was used to determine the sewage loading rate. On Page 47, Figure 19 of the Manual of Septic Tank Practice,the relationship between the percolation rate (minutes per inch)and the allowable rate of sewage application(gallons per day per square foot) is Soo, o,