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18 September 2020 AdvancedGeo <br /> Project No. 20-6116 An Employee-Owned Company <br /> Page 10 of 16 <br /> 6.5. COMPLETED PERCOLATION TEST FORM <br /> After completion of the successful tests, the EHD inspector reviewed the field data and <br /> signed the required EHD Percolation Test Rate forms. Field measurements recorded <br /> during the test are included on the Percolation Test Rate Field Sheets provided in <br /> Appendix D. <br /> 6.6. POTENTIAL PROBLEMS PREDICTED <br /> On site soils within the shallow percolation test hole demonstrated adequate percolation <br /> rates. <br /> 6.7. PERCOLATION TEST FINDINGS <br /> The shallow percolation tests performed provided satisfactory percolation test rates. The <br /> percolation rate of 1.54 minutes per inch (MPI) for P-1 and 1.13 MPI for P-2 were <br /> calculated from data collected during the percolation tests; the smallest reading over the <br /> 1-hour period was used to calculate the percolation rate. The use of the proposed septic <br /> system should follow the San Joaquin County OWTS Standards. <br /> 7.0. CHEMICAL AND PHYSICAL PROPERTIES OF SOIL <br /> Soil chemical properties were supplied by regionally sourced material for the surrounding <br /> area. <br /> 7.1. CHEMICAL AND PHYSICAL PROPERTIES OF SITE SOILS <br /> The dominant soil composition in the general area of the property was inferred from <br /> information provided by the United States Department of Agriculture's Soil Geographic <br /> Database (USDASGD). The USDASGD soil survey indicates the soil type for the property <br /> is predominantly composed of Tinnin loamy coarse sand having 0 to 2 percent slopes <br /> (#255). The Tinnin loamy coarse sand is composed of alluvium derived from granitic rock <br /> sources. Soils are described as well drained, with a high to very high permeability, and <br /> salinity ranging from 0.0 to 2.0 millimhos per centimeter (mmhos/cm). The Tinnin loamy <br /> coarse sand typically has the same chemical properties between surface grade and 75 <br /> inches bsg. <br /> 7.2. MASS TRANSPORT PROPERTIES OF UNDERLYING SITE SOILS <br /> The percolation test and dominant soil type at the site indicates that the soils are semi- <br /> permeable to permeable and have low water storage. These soils will allow moderate <br />