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10 September 2020 AdvancedCeo Project No. 20-6095 AnEmployee-Owned Compony Page 9 of 15 ^^ was 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 test, the EHD inspector reviewed the field data and signed the required EHD Percolation Test Rate form. Field measurements recorded during the test are included on the Percolation Test Rate Field Sheet provided in Appendix D. 6.6. POTENTIAL PROBLEMS PREDICTED On site soils within the shallow percolation test hole demonstrated percolation rates outside of the range for a standard septic system. 6.7. PERCOLATION TEST FINDINGS The shallow percolation test performed provided an unsatisfactory percolation test rate. The percolation rate of 0.56 minutes per inch (MPI) was calculated from data collected during the percolation test; the smallest reading over the 39-minute 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 two soil types for the property: 1) the northern half of the site is predominantly composed of Timor loamy sand having 0 to 2 percent slopes (#254); and 2) the southern half of the site is predominantly composed of Delhi-Urban land complex having 0 to 2 percent slopes (#143). The Timor loamy sand is composed of alluvium derived from granitic rock sources. Soils are described as moderately well drained, with a very low permeability, and salinity ranging from 0.0 to 2.0 millimhos per centimeter (mmhos/cm). The Timor loamy sand typically have the same chemical properties between surface grade and 56 inches bsg.