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LOGE 2229: Dhillon Percolation Testing Page 2 May 26, 2022 Percolation Test Procedure Live Oak conducted the percolation tests for the borings on May 23, 2022. Percolation test procedures conformed to San Joaquin County Environmental Health Department policy. Due to the initial percolation rates observed, a standard four-hour test was selected for the southern boring, while a one-hour test was selected for the northern boring. Water level measurements were taken every 30 minutes during the four-hour period and every ten minutes during the one-hour period. Mr. Francisco Garcia Ruiz, Registered Environmental Health Specialist at the San Joaquin County Environmental Health Department, observed the final 30 minutes of each percolation test. 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, each 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. Garcia Ruiz and indicates 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 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) South Test 5/23/22 2.39 4.5 4 hr. Satisfactory perc. rate' Shallow North Test 5/23/22 2.75 2.6 1 hr. Satisfactory perc. rate' Shallow 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 1.0 and 5.0 min/in requires a 20-foot separation between the bottom of dispersal system and ground water,or mitigation by system design or enhancement.