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- Percolation 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). Percolation test procedures conformed to San Joaquin County Environmental Health Department policy. Preparation and Presaturation of Percolation Test Holes After the boring was advanced by hand auger and the soils logged, the test hole was completed for the percolation test. Approximately 2 inches of pea gravel were placed in the bottom of the 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. Live Oak presaturated the percolation test hole approximately 24 hours prior to the percolation test. The hole was filled with water to a height of 12 inches above the bottom of the boring for the presaturation. On the day of testing, the percolation test hole was found to be intact and dry. Percolation Test Procedure Live Oak conducted the percolation test for the boring on August 25, 2011. Due to rapid initial percolation rates, a one-hour test was selected. Water level measurements were taken every ten minutes during this one-hour period. Michael Escotto, Senior Registered Environmental Health Specialist at the San Joaquin County Environmental Health Department, observed the duration of the test. An electronic well sounder with a depth accuracy of 1/1001h 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 or more 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 rate for a shallow test is less than or equal to 60 minutes per inch (min/in) drop. A deep percolation test hole has a depth greater than 3.5 up to 25 feet: a satisfactory percolation rate for a deep test is 30 min/in or less. For the Site to utilize a standard LOGE 1124 Page 6