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16 Febuary 2022 AdvancedGeo Project No. 22-6747 An Employee -Owned Company Page 7 of 13 Percolation Test Rate Field Sheet is provided in Appendix B. 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 B. 6.6. POTENTIAL PROBLEMS PREDICTED On site soils within the shallow percolation test hole demonstrated an adequate percolation rate. 6.7. PERCOLATION TEST FINDINGS The shallow percolation test performed provided a satisfactory percolation test rate. The percolation rate of 13.15 minutes per inch was calculated from data collected during the four-hour percolation test; the final reading over the four-hour period was used to calculate the percolation rate. The use of the existing and proposed septic systems 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 soil type for the property is predominantly composed of Finrod clay loam and Stockton clay having 0 to 2 percent slopes (#158 and #250). The Finrod clay loam and Stockton clay are composed of alluvium derived from mixed rock sources. Soils are described as moderately well drained, with low to very low permeability, and salinity ranging from 0.0 to 2.0 millimhos per centimeter (mmhos/cm). The Finrod clay loam typically features clay loam from 0 to 8 inches bsg, clay from 8 to 33 inches bsg and cemented soils from 42 to 60 inches bsg. The Stockton clay typically features clay from 0 to 37 inches bsg, clay loam from 37 to 42 inches bsg and cemented soils from 42 to 60 inches bsg.