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03 June 2021 <br />Project No. 21-6431 <br />Page 9 of 15 <br />Advanced,.', <br />An employee -Awned Compony <br />added to the boring after each 30 -minute interval as required. The water level was <br />measured from a fixed reference point at the top of the casing using a Solinst water level <br />meter. The final measurements were observed by the EHD inspector. Based on the field <br />measurements collected, the percolation rate for the parcel was calculated; the <br />Percolation Test Rate Field Sheet is provided in Appendix C. <br />6.5. COMPLETED PERCOLATION TEST FORM <br />After completion of the test, the EHD inspector reviewed the field data and signed the <br />required EHD Percolation Test Rate form. Field measurements recorded during the test <br />are included on the Percolation Test Rate Field Sheet provided in Appendix D. <br />6.6. POTENTIAL PROBLEMS PREDICTED <br />On site soils within the shallow percolation test hole demonstrated an adequate <br />percolation rate. Additionally, the existing septic system has been operating properly. <br />6.7. PERCOLATION TEST FINDINGS <br />The shallow percolation test performed provided a satisfactory percolation test rate. The <br />percolation rate of 9.26 minutes per inch was calculated from data collected during the <br />four-hour percolation test; the final reading over the four-hour period was used to <br />calculate the percolation rate. The use of the existing and proposed septic systems should <br />follow the San Joaquin County On-site Wastewater Treatment 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 Hollenbeck silty clay having 0 to 2 percent slopes (#173). <br />The Hollenbeck silty clay is composed of alluvium derived from mixed rock sources. Soils <br />are described as moderately well drained, with a very low permeability, and salinity <br />ranging from 0.0 to 2.0 millimhos per centimeter (mmhos/cm). The Hollenbeck silty clay <br />typically features silty clay from 0 to 10 inches bsg, clay from 10 to 37 inches bsg, silty <br />