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20 July 2021 AdvancedGeo <br /> Project No. 21-6486 An Employee-Owned Company <br /> Page 9 of 15 <br /> 6.4. PERCOLATION TEST CONFORMED TO SJC POLICY EHD 98-02 <br /> The work was performed in accordance with San Joaquin County Division 11 <br /> Section 9-1105.2 (d) General Requirements. <br /> On 01 July 2021, Percolation test procedure #3 was performed by adding water to <br /> approximately six inches above the sand and recording the amount of water remaining in <br /> the borehole after 5-minute intervals for a period of one hour. Additional water was added <br /> to the boring after each 5-minute interval as required. The water level was measured from <br /> a fixed reference point at the top of the casing using a Solinst water level meter. The final <br /> measurements were observed by the EHD inspector. Based on the field measurements <br /> collected, the percolation rate for the parcel was calculated-, the Percolation Test Rate <br /> 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 systems have 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 1.09 minutes per inch was calculated from the final measurement <br /> collected during the one-hour percolation test. The use of the existing and proposed <br /> septic systems should follow the San Joaquin County On-site Wastewater Treatment <br /> Standards. <br /> 7.0. CHEMICAL AND PHYSICAL PROPERTIES OF SOIL <br /> Soil chemical properties were supplied by material sourced from the surrounding 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 />