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• Percolation Test Two shallow percolation tests and one deep percolation test were conducted in the proposed septic disposal area of the Site. The soil borings discussed above were used for the percolation test holes (Plate 9). Percolation test procedures conformed to San Joaquin County Environmental Health Department policy. Preparation and Presaturation of Percolation Test Holes After the borings were advanced by hand auger and the soil logged, the test holes were completed for the percolation testing. Approximately two inches of pea gravel were placed in the bottom of each open soil boring, followed by a 2.0-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 each percolation test hole approximately 24 hours prior to the percolation testing. Each holes was filled with water to a height of 12 inches above the bottom of the boring for the presaturation. On the day of testing, each hole was found to be intact and dry. Percolation Test Procedure Live Oak conducted the percolation test for the first shallow boring on January 16, 2019, • and the percolation test for the second shallow boring and the deep boring on January 29, 2019. Due to initial percolation rates observed, four-hour tests were selected. Water level measurements were taken every 30 minutes during the four-hour period. The last 30 minutes of each test were observed by Sukhreet Kaur, Registered Environmental Health Specialist at the San Joaquin County Environmental Health Department. An electronic well sounder with a depth accuracy of 1/100th 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 holes were refilled with water to a level of six inches or more above the bottom of the hole. Percolation Test Results The completed percolation test forms are included in Appendix 3 of this report. The forms were signed by Ms. Kaur and indicate a percolation rate for each 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 greater than or equal to 1 minute per inch (min/in) but less than • LOGE 1901 Page 5