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1 <br /> Mr.Brian Rogers <br /> December 2,2002 <br /> Page 2 <br /> additional percolation tests were performed in the area of the primary residence septic field. The <br /> following table provides a summary of the percolation tests performed on Parcel No. 4 by our <br /> office. <br /> Percolation Test Summary <br /> Standard San Joaquin County Percolation Test Method Utilized <br /> Name Test Depth(ft) Date Tested Percolation(Rate) <br /> I (SDU) 3 5/7/02 125 min/in <br /> 2(SDU) 3.5 5/7/02 50 min/in <br /> 3 (SDU) 14.5 5/7/02 125 min/in <br /> 1 (Main Res.) 3 8/1/02 83 min/in <br /> 2(Main Res.) 3 8/1/02 50 min/in <br /> Due to the unsatisfactory results of percolation testing in the area of the SDU, further <br /> percolation testing to locate suitable soils on the property will probably not yield satisfactory <br /> results. Therefore an engineered septic system design was proposed to mitigate the effect of the <br /> slow percolating soils in the proposed leach field area. A conservative percolation rate of 125 <br /> minutes per inch was used to design the septic system. <br /> Il. Design Calculations <br /> Shallow Leach Lines: <br /> Initial disposal of effluent will be in shallow leach lines. A sewage loading equation <br /> obtained from the Manual of Septic Tank Practice(1967)was used to determine the sewage <br /> loading rate. On Page 47, Figure 19 of the Manual of Septic Tank Practice,the relationship <br /> between the percolation rate(minutes per inch) and the allowable rate of sewage application <br /> (gallons per day per square foot) is shown. This is the basic equation for determining the <br /> required absorption area based on estimated flow. The calculated sewage loading rate, <br /> assumptions, and variables are presented next: <br /> =pE 930 <br /> l <br /> a�j1OE <br />