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• The soil in the borings was similar overall to that described by the Soil Survey. In boring <br /> P1, silty clay was encountered to approximately 2.5 feet below ground surface, followed <br /> by silty fine sand to the full extent of the hole. In boring P2, clayey silt was encountered <br /> to approximately six inches below ground surface, followed by silty clay with fine sand to <br /> the full depth of the hole. In boring P3, silty clay was encountered to the full depth of <br /> the hole. The soil logs are presented on Plates 10 through 12. <br /> Discussion of Soil Lithology <br /> Based on the soil observed in the borings, there appears to be limited potential for <br /> percolation at the test locations. Sandy soils generally have a much greater potential <br /> for percolation than fine-grained or cemented soils. However, a percolation test is the <br /> only accepted method for determining the suitability of the soils for a septic disposal <br /> area. Percolation test results are discussed in the following section. <br /> Percolation Tests <br /> A shallow percolation test was conducted on each proposed parcel of the Site. The soil <br /> borings discussed above were used for the percolation test holes (Plate 9). Percolation <br /> test procedures conformed to San Joaquin County Environmental Health Department <br /> policy. <br /> • Preparation and Presaturation of Percolation Test Holes <br /> After the borings were advanced by hand auger and the soils logged, the test holes <br /> were completed for the percolation tests. Approximately two inches of pea gravel were <br /> placed in the bottom of each open soil boring, followed by a 2.0-inch diameter PVC pipe <br /> with perforations on the bottom. Pea gravel was then used to backfill a few inches of <br /> 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, the holes were found <br /> to be intact and dry. <br /> Percolation Test Procedure <br /> Live Oak conducted the percolation tests for the borings on November 20, 2018. Due to <br /> soil conditions observed, four-hour tests were selected. Water level measurements <br /> were taken every 30 minutes during this four-hour period. The last 30 minutes of each <br /> test were observed by Sukhreet Kaur, Environmental Health Specialist at the San <br /> Joaquin County Environmental Health Department. <br /> is <br /> LOGE 1845 Page 6 <br />