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15 April 2009 <br /> AGE-NC-09-1683 <br /> Page 11 of 18 <br /> filled with water to a depth of 12 inches above the gravel at the time of 0900. Test hole TH-1 was <br /> covered for 24 hours to allow for complete saturation. <br /> 6.4. DESCRIPTION OF THE PERCOLATION TEST HOLE -POST SOAK <br /> On 31 March 2009 boring TH-1 was found to be completely� g p y dry,but intact and in good condition. <br /> r <br /> 6.5. PERCOLATION TEST CONFORMED TO SJC POLICY EHD 02-02 <br /> The percolation test was performed under SJCCDD Title Requirements Section 9-1105.2 (d) and <br /> as required by SJCEHD letter dated 17 December 2008. <br /> On 31 March 2009, test hole TH-1 was inspected by AGE prior to initiation of the percolation test <br /> and found dry.Water was refilled to six inches above the gravel and the four-hour test initiated.The <br /> percolation test was performed by recording the amount of water remaining in the test hole at <br /> 30-minute intervals. The water level was measured every 30 minutes for four hours and a small <br /> volume of water added to the test hole after each measurement. The SJCEHD inspector was on-site <br /> to observe the last one hour of the test. After recording the last measurement,the SJCEHD inspector <br /> approved the four-hour percolation test. <br /> Based on the field measurements collected, the percolation rate for the parcel was calculated and <br /> summarized in Table 3. <br /> Table 3 <br /> SOIL PERCOLATION FOR TEST HOLE TH-1 <br /> TEST NO. DIAMETER OF DEPTH OF HOLE PERCOLATION <br /> HOLE(inches) (inches) RATE(min/in) <br /> TH-1 (Parcel 1) 4 42 50(average) <br /> 6.6. COMPLETED PERCOLATION TEST FORM <br /> After completion of the test,the SJCEHD inspector reviewed the field data and signed the required <br /> SJCEHD Percolation Test Rate form.Field measurements recorded during the test are included on <br /> the Percolation Test Rate Field Sheet provided in Appendix F. <br /> Advanced GeoEnvironmental,Inc. <br />