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LOGE 20-43: Silva Percolation Test Page 2 September 21, 2020 Percolation Test Procedure Live flak conducted the percolation test for the boring on September 16, 2020. Percolation test procedures conformed to San Joaquin County Environmental Health Department policy. Due to the soil type observed, a standard four-hour test was selected. Water level measurements were taken every 30 minutes during this four-hour period. Daria Afonskaia„ 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 approximately 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. Afonskaia 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 test 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) 9116120 3.25 8.62 4 hr. Satisfactory 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 64 min/in. The soils on the Site have demonstrated a satisfactory percolation rate for the use of a septic system in accordance with the requirements of the San Joaquin County Environmental Health Department. This percolation test is considered representative of soils within an approximate 100-foot radius of the test location. Based on the percolation rate encountered between 5.0 and 30 min/in, the San Joaquin County Environmental Health Department will require an eight- foot separation from the bottom of the dispersal system to ground water.