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05 May 2015 AGE Project No. 14-3119 Page 6 of 7 6.4. DESCRIPTION OF THE PERCOLATION TEST HOLE - POST SOAK On 31 March 2015, the boring was found to be completely dry, but intact and in good condition. 6.5. PERCOLATION TEST CONFORMED TO SJC POLICY EHD 02-02 The work was performed under SJCCDD Title Requirements Section 9-1105.2 (d) and as required by EHD letter. On 30 March 2015, test hole one was inspected prior to initiation of the percolation test. The percolation test was performed by recording the amount of water remaining in the bore hole at 30-minute intervals. The initial 6-inches of water seeped from test hole in less than 30-minutes. After recording the measurement the EHD inspector approved a one-hour percolation test. Additional water was added to the boring as required to ensure that approximately 6-inches of water remained. The water level was measured from a fixed reference point at the surface of the boring, using a Solinst water level meter. Measurements were taken at 30-minute intervals for over four hours. The final three measurements were observed by the EHD inspector. Based on the field measurements collected, the percolation rate for the parcel was calculated and presented in the following forms. 6.6. 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. 6.7. POTENTIAL PROBLEMS PREDICTED On site soils within the shallow percolation test range demonstrated adequate percolation rates. Additionally, the existing septic system has been properly operating. 6.8. PERCOLATION TEST FINDINGS The shallow percolation test performed provided a satisfactory percolation test rate. The percolation rate of 50 minutes per inch was calculated from data collected during the 4.5-hour percolation test. The use of the existing septic system should follow the San Joaquin County On-site Wastewater Disposal Standards. Advanced GeoEnvironmental,Inc.