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02 March 2020 AdvancedGeo Project No. 20-5001 AnEmp/oyee-Owned Company Page 8 of 14 6.4. PERCOLATION TEST CONFORMED TO SJC POLICY EHD 98-02 The work was performed in accordance with San Joaquin County Division 11 Section 9-1105.2 (d) General Requirements. On 07 February 2020, the percolation test hole was dry after sitting overnight. Percolation test procedure #2 was performed by adding water to approximately six inches above the sand and recording the amount of water remaining in the borehole after 30-minute intervals. The water level was measured from a fixed reference point at the surface of the boring using a Solinst water level meter. The final measurement 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 C. 6.5. COMPLETED PERCOLATION TEST FORM After completion of the successful 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 C. 6.6. POTENTIAL PROBLEMS PREDICTED On site soils within the shallow percolation test hole demonstrated semi-adequate percolation rates. Although the percolation rate was slow, the rate was still within the range for a standard septic system for this location in the county as outlined in the EHD OWTS Standards (1 — 120 min/inch). 6.7. PERCOLATION TEST FINDINGS The shallow percolation test performed provided a satisfactory percolation test rate. The percolation rate of 83.33 minutes per inch was calculated from data collected during the percolation test; the smallest reading over the 4-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.