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f 22 April 2009 AGE-NC-09-1683 Page 11 of 19 6.5. PERCOLATION TEST CONFORMED TO SJC POLICY EHD 02-02 The percolation test was performed under SJCCDD Title Requirements Section 9-1105.2 (d) and as required by SJCEHD letter dated 17 December 2008. On 31 March 2009, test hole TH-1 was inspected by AGE prior to initiation of the percolation test I and found dry.Water was refilled to six inches above the gravel and the four-hour test initiated. The percolation test was performed by recording the amount of water remaining in the test hole at 30-minute intervals. The water level was measured every 30 minutes for four hours and a small volume of water added to the test hole after each measurement. The SJCEHD inspector was on-site to observe the last one hour of the test. After recording the last measurement,the SJCEHD inspector approved the four-hour percolation test. Based on the field measurements collected, the percolation rate for the parcel was calculated and summarized in Table 3. Table 3 SOIL PERCOLATION FOR TEST HOLE TH-1 MTEST NO.' I=NDIAM11TER OF DEPTH OF HOL'E� PEkC0JX TON HOLE(inches) (inches} RATE (min/in} TH-1 Parcell 4 42 50 avera e I I 6.6. COMPLETED PERCOLATION TEST FORM After completion of the test,the SJCEHD inspector reviewed the field data and signed the required SJCEHD Percolation Test Rate form.Field measurements recorded during the test are included on the Percolation Test Rate Field Sheet provided in Appendix F. 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. The proposed septic system should be sufficient to provide for expected winery-associated operations. I Advanced GeoEnvironmental,Inc.