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LOGE 2239: Bertsch Percolation Test 2 August 23, 2022 Due to initial percolation rates observed, a one-hour test was selected. Water level measurements were taken every five to ten minutes during this one-hour period. Aaron Gooderham, 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`h 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. Gooderham 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 test are summarized in the following table. Test No., Date Tested P1 8/19/22 Shallow Test Table 1. Percolation Test Summary Percolation Percolation Test Duration Test Rate Depth (ft.) (minutes/inch) 2.72 1.7 Comments (see note) 1 hr. Satisfactory 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. 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 1.0 and 5.0 min/in encountered in the test hole, the San Joaquin County Environmental Health Department will require a 20 -foot separation from the bottom of the dispersal system to ground water, unless mitigated by system design or enhancement. Given the estimated depth to water of 50 to 70 feet, no modification to standard systems should be required. Discussion of Septic System Sizing Septic system construction utilizing leach lines, filter beds, or leach lines with shallow sumps should follow the San Joaquin County On -Site Wastewater Treatment Systems Standards