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• Discussion of Soil Lithology <br /> Based on the soil observed in the borings, there appears to be good potential for <br /> percolation in the shallow soil zone at the test location. Sandy soils generally have a <br /> much greater potential for percolation than fine-grained or cemented soils. However, a <br /> percolation test is the only accepted method for determining the suitability of the soils <br /> for a septic disposal area. Percolation test results are discussed in the following <br /> section. <br /> Percolation Test <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 10). <br /> Percolation test procedures conformed to San Joaquin County Environmental Health <br /> Department 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 one inch of pea gravel was <br /> placed in the bottom of each open soil boring, followed by a 1.5-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. The holes were filled with water to a height of 12 inches above the <br /> bottom of the boring for the presaturation. On the day of testing, both holes were found <br /> to be intact and dry. <br /> Percolation Test Procedure <br /> Live Oak conducted the percolation tests for the borings on July 20, 2016. Due to soil <br /> conditions observed, four-hour tests were selected. Water level measurements were <br /> taken every 30 minutes during this four-hour period. The last half hour of the test was <br /> observed by Frank Girardi, Senior Registered Environmental Health Specialist at the <br /> San Joaquin County Environmental Health Department. <br /> A wooden ruler was utilized for the water level measurements. The water level was <br /> measured against a fixed reference point on the well casing. Measurements were <br /> recorded on the data sheet in decimal inches. When necessary after measuring the <br /> water level, the hole was refilled with water to a level of six inches or more above the <br /> bottom of the hole. <br /> • <br /> LOGE 1613 Page 6 <br />