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18 September 2020 AdvancedGeo Project No. 20-6116 An Employee-Owned Compony Page 9 of 15 The water levels were measured from a fixed reference point at the surface of the boring using a Solinst water level meter. The final measurements were observed by the EHD inspector. Based on the field measurements collected, the percolation rate for the parcel was calculated; the Percolation Test Rate Field Sheet is provided in Appendix D. 6.5. COMPLETED PERCOLATION TEST FORM After completion of the successful tests, the EHD inspector reviewed the field data and signed the required EHD Percolation Test Rate Sheets. Field measurements recorded during the test are included on the Percolation Test Rate Field Sheets provided in Appendix D. 6.6. POTENTIAL PROBLEMS PREDICTED On site soils within the shallow percolation test hole demonstrated adequate percolation rates. 6.7. PERCOLATION TEST FINDINGS The shallow percolation tests performed provided satisfactory percolation test rates. The percolation rate of 1.54 minutes per inch (MPI) for P-1 and 1.13 MPI for P-2 were calculated from data collected during the percolation tests; the smallest reading over the one-hour period was used to calculate the percolation rate. The use of the proposed septic system should follow the San Joaquin County OWTS Standards. 7.0. CHEMICAL AND PHYSICAL PROPERTIES OF SOIL Soil chemical properties were supplied by regionally sourced material for the surrounding area. 7.1. CHEMICAL AND PHYSICAL PROPERTIES OF SITE SOILS The dominant soil composition in the general area of the property was inferred from information provided by the United States Department of Agriculture's Soil Geographic Database (USDASGD). The USDASGD soil survey indicates the soil type for the eastern portion of the subject property is predominantly composed of Tinnin loamy coarse sand having 0 to 2 percent slopes (#255). The Tinnin loamy coarse sand is composed of alluvium derived from granitic rock sources. Soils are described as well drained, with a high to very high permeability, and salinity ranging from 0.0 to 2.0 millimhos per centimeter (mmhos/cm). The Tinnin loamy coarse sand typically has the same chemical properties between surface grade and 75 inches bsg.