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LOGE 2116: Rico Percolation Test <br />April 16, 2020 <br />Percolation Test Procedure <br />Page 2 <br />Live Oak conducted the percolation test for the borings on April 14, 2021. Percolation test <br />procedures conformed to San Joaquin County Environmental Health Department policy. <br />Due to initial percolation rates observed, a four-hour test was selected. Water level <br />measurements were taken every 30 minutes during this four-hour period. Daria Afonskaia, <br />Registered Environmental Health Specialist at the San Joaquin County Environmental Health <br />Department, observed the final 30 minutes of the percolation test. <br />An electronic well sounder with a depth accuracy of 1/100th foot was utilized for the water level <br />measurements. The water level was measured against a fixed reference point on the well <br />casing. Measurements were recorded on the data sheet in decimal feet. When necessary after <br />measuring the water level, each hole was refilled with water to a level of approximately six <br />inches above the bottom of the hole. <br />Percolation Test Results <br />The completed percolation test form is attached to this letter. The form was signed by Ms. <br />Afonskaia and indicates a percolation rate for each hole based on the least water drop <br />observed. <br />Per San Joaquin County Environmental Health Department's definition, a shallow percolation <br />test hole has a depth between 3.0 and 3.5 feet; a satisfactory percolation rate for a shallow test <br />is greater than 1 minute per inch (min/in) but less than or equal to 60 min/in drop. A deep <br />percolation test hole has a depth between 3.5 and 25 feet; a satisfactory percolation rate for a <br />deep test is greater than 1 min/in but less than or equal to 30 min/in drop. <br />Details and results of the percolation testing are summarized in the following table. <br />Table 1. Percolation Test Summary <br />Test No., <br />Percolation <br />Percolation Test Duration <br />Comments <br />Date Tested <br />Test <br />Rate <br />(see note) <br />Depth (ft.) <br />(minutes/inch) <br />P1 -S, <br />4/14/21 <br />3.25 <br />27.8 4 hr. <br />Satisfactory <br />Shallow Test <br />perc. rate' <br />P1 -S, <br />4/14/21 14.21 <br />17.9 4 hr. Satisfactory <br />Deep Test perc. rate' <br />Note: A satisfactory percolation rate for a "shallow" test is greater than 1 min/in but less than or equal to 60 min/in. A <br />satisfactory percolation rate for a "deep" test is greater than 1 min/in but less than or equal to 30 min/in. <br />1 Per San Joaquin County Environmental Health Department, a rate between 5.0 and 30.0 min/in requires an 8 -foot <br />separation between the bottom of dispersal system and ground water, or mitigation by system design or enhancement. <br />The soils on the Site have demonstrated a satisfactory percolation rate for the use of standard <br />septic systems in accordance with the requirements of the San Joaquin County Environmental <br />