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r 12 June 2008 AGE-NC-07-1581 Page 9 of 17 6.2. NUMBER OF PERCOLATION TESTS PERFORMED One percolation test was conducted on site. The rapid percolation of the test hole required the performance of a one-hour percolation test. 6.3. CONSTRUCTION OF PERCOLATION TEST HOLE On 26 December 2007, one boring(TH-1)was advanced for a shallow percolation test. The boring was advanced using a four-inch hand auger to a depth of 42-inches bsg.The boring was located more than 100 feet from the current well location and within 100 feet of the proposed septic system location.Following bore hole advancement,the sides of the boring were scraped and loose material was removed from the bore hole.Once the bore hole was cleared of loose material,a 4-inch diameter perforated PVC pipe and 2 inches of gravel were added to the bore hole. The bore hole was then filled with water to a depth of 12 inches above the gravel at the time of 0900. Test hole TH-1 was covered for 24 hours to allow for complete saturation of the bore hole. 6.4. DESCRIPTION OF THE PERCOLATION TEST HOLE - POST SOAK On 27 December 2007, boring TH-1 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 dated 09 October 2007. i On 27 December 2007, test hole TH-1was 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 C 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 on the PVC casing using a Solinst water level meter. Measurements were taken at 10-minute intervals for one hour. 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 summarized in Table 2. I Advanced GeoEnvironmental,Inc. i I I