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' 05 November 2014 AGE Project No. 14-3119 ' Page 9 of 17 ' 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, dated 06 September 2012. On 22 July 2014, 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. t6.6. 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 D. ' 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 31.25 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. ' 7.0. CHEMICAL AND PHYSICAL PROPERTIES OF SOIL ' Soil chemical properties were supplied by regionally sourced material for the surrounding area. 1 Advanced GeoEnvironmental,Inc. 1