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fPercolation Test One shallow percolation test was conducted on the Site; the shallow soil boring discussed above was used for the percolation test hole (Plate 2). The deep boring was abandoned one hour into the test due to lack of movement of the water. Percolation test procedures conformed to San Joaquin County Environmental -Health -Department policy, Preparation and Presaturation of Percolation Test Holes f After the borings were advanced by hand auger and the soils logged, the test holes were completed for the percolation tests. Approximately 2 inches of pea gravel were placed in the bottom of each open soil boring, followed by a 1.5-inch diameter PVC pipe with perforations on the bottom. Pea gravel was then used to backfill a few inches of the annular space. LOGE presaturated the percolation test holes approximately 24 hours prior to the percolation test. The holes were filled with water to a height of 12 inches above the bottom of the boring for the presaturation. On the day of testing, the shallow hole was found to be intact and dry; the deep hole was intact but still contained presaturation water. Percolation Test Procedure LOGE conducted the percolation tests for the borings on October 22, 2009. Due to initial percolation rates Observed, a four-hour test was required. The deep boring was abandoned one hour into the test due to lack of movement of the water. Water level measurements were taken every half-hour during this four-hour period. Michael Escotto, Senior RegisteredEnvironmental Health Specialist at the San Joaquin County Environmental Health Department, observed the last half-hour of the test. An electronic well .sounder with .a depth -accuracy of 1.11.0.0t" foot was .utilized .for the water level measurements. The water level was measured against a fixed reference point on the well casing. Measurements were recorded on the data sheet in decimal feet. When necessary after measuring the water level, the hole was refilled with water to a level of six inches above the bottom of the hole. Percolation Test Results The completed percolation test form is included in Appendix 3 of this report. The form was signed by Mr. Escotto and indicates a percolation rate for the hole based on the final water drop observed. Per San Joaquin County Environmental Health Department's definition, a shallow .percolation test hole has a depth between 36 and 42 inches; a satisfactory percolation LOGE0915 Page 6