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LOGE 2225: Herrin Percolation Test April 26, 2022 Percolation Test Procedure Page 2 Live Oak conducted the percolation test for the boring on April 25, 2022. Percolation test procedures conformed to San Joaquin County Environmental Health Department policy. Due to the soil type present, a standard four-hour test was selected. Water level measurements were taken every 30 minutes during this four-hour period. Naseem Ahmed, Registered Environmental Health Specialist at the San Joaquin County Environmental Health Department, observed the final 30 minutes of 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 Mr. Ahmed 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 1.5 and 3.5 feet; 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, 4/25/22 2.17 6.25 4 hr. Satisfactory Shallow Test perc. rate Note: A satisfactory percolation rate for a "shallow" test is greater than 1 min/in but less than or equal to 60 min/in. 1 Per San Joaquin County Environmental Health Department, a rate between 5.0 and 30.0 min/in requires an eight -foot separation between the bottom of dispersal system and ground water, or mitigation by system design or enhancement. The soils on the Site have demonstrated a satisfactory percolation rate for the use of standard septic systems 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. Because of the percolation rate between 5.0 and 30.0 min/in encountered in the test hole, the San Joaquin County Environmental Health Department will require an eight -foot separation from the bottom of the dispersal system to ground water. Based on local ground water