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Percolation Test <br />Shallow percolation tests were conducted on Parcels C and D of the Site. Shallow and <br />deep percolation tests were conducted on Parcels A and B. The soil borings discussed <br />above were used for the percolation test holes. Percolation test procedures conformed <br />to San Joaquin County Environmental Health Department policy. <br />Preparation and Presaturation of Percolation Test Holes <br />After the borings were advanced by hand auger or drilling rig and the soil logged, the <br />test holes were completed for the percolation testing. Approximately two inches of pea <br />gravel were placed in the bottom of each open soil boring, followed by a 2.0-inch <br />diameter PVC pipe with perforations on the bottom. Pea gravel was then used to <br />backfill a few inches of the annular space. <br />Live Oak presaturated the percolation test holes approximately 24 hours prior to the <br />percolation testing. Each hole was filled with water to a height of 12 inches above the <br />bottom of the boring for the presaturation. On the day of testing, most of the holes were <br />found to be intact and dry; standing water was observed in the shallow hole on Parcel <br />B. <br />Percolation Test Procedure <br />Live Oak conducted the percolation tests for the borings on April 2, 6, 21, and 22, 2021. <br />Based on initial percolation rates observed, one-hour or four-hour tests were selected. <br />Water level measurements were taken every 10 minutes during the one-hour period, <br />and every 30 minutes during the four-hour period. The last 30 minutes of each test <br />were observed by Dana Afonskaia, Aldara Salinas, or Francisco Garcia Ruiz, <br />Registered Environmental Health Specialists at the San Joaquin County Environmental <br />Health Department. <br />An electronic well sounder with a depth accuracy of 1/100th foot was utilized for the <br />water level measurements. The water level was measured against a fixed reference <br />point on the well casing. Measurements were recorded on the data sheet in decimal <br />feet. When necessary after measuring the water level, each hole was refilled with water <br />to a level of approximately six inches above the bottom of the hole. <br />Percolation Test Results <br />The completed percolation test forms are included in Appendix 3 of this report. Each <br />form was signed by the inspector and indicates a percolation rate for the hole based on <br />the least or last water drop observed. <br />LOGE 2062 Page 7