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02 March 2023 AdvancedGeo Project No. 23-7124 An Employee-Owned Company Page 8 of 14 in the borehole after a 30-minute interval. Additional water was added to the boring after each 30-minute interval as required. The water level was measured from a fixed reference point at the top of the casing using a Solinst water level meter. The final measurements were observed by the EHD inspector. Based on the lowest measurement collected, the percolation rate for the parcel was calculated. The Percolation Test Rate Field Sheet is provided in Appendix E. 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 E. 6.6. PERCOLATION TEST FINDINGS The shallow percolation test provided a satisfactory percolation test rate. The percolation rate of 13.30 minutes per inch was calculated from data collected during the four-hour percolation test; the lowest reading over the four-hour period was used to calculate the percolation rate. The percolation rate would be 10.00 minutes per inch if the final reading from the four-hour percolation test was used to calculate the percolation rate (which is the current procedure for calculating the percolation rate). The use of the proposed septic system should follow the San Joaquin County On-site Wastewater Treatment 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 following two soil types at the property: • The northern and southern portion of the property is predominantly composed of the Veritas fine sandy loam having 0 to 2 percent slopes (#266). The Veritas fine sandy loam is composed of alluvium derived from mixed rock sources. Soils are described as moderately well drained, with very low runoff, low capacity to transmit water and salinity ranging from 0.0 to 4.0 millimhos per centimeter (mmhos/cm).