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LOGE 20-18b: Ng Percolation Test Page 2 July 2, 2020 Preparation and Presaturation of-Percolation Test Hole After the shallow boring was advanced by hand auger, the test hole was completed for the percolation test. Approximately two inches of pea gravel were placed in the bottom of the 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 the percolation test hole approximately 24 hours prior to the percolation testing. 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 hole was found to be intact and dry. Percolation Test Procedure Live Oak conducted the percolation test for the boring on June 19, 2020. Percolation test procedures conformed to San Joaquin County Environmental Health Department policy. Due to the initial water drop observed, a standard four-hour test was selected. Water level measurements were taken every 30 minutes during this four-hour period. Sukhreet Kaur, Registered Environmental Health Specialist at the San Joaquin County Environmental Health Department, observed the percolation test. An electronic well sounder with a depth accuracy of 1/100", 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 attached to this letter. The form was signed by Ms. Kaur and indicates a percolation rate for the hole based on the least 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 1 minute per inch (min/in) but less than or equal to 60 min/in drop. Details and results of the percolation testing are summarized in the following table. Table 1. Percolation Test Summary Test No., Percolation Percolation Test Duration Comments Date Tested Test Rate (see note) Depth (ft.) (minutes/inch) P1, Satisfactory 6/19/20 3.34 5.10 4 hr. perc. rate Shallow Test Note: A satisfactory percolation rate for a"shallow"test is greater than 1 min/in but less than or equal to 60 minlin.