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The soil in the boring was similar to those described by the Soil Survey. Silty sand was <br />observed to the full depth of the hole. The soil log is presented on Plate 12. <br />Discussion of Soil Lithology <br />Based on the soil observed in the boring, there appears to be good potential for <br />percolation in the shallow soil zone. Sandy soils generally have a much greater <br />potential for percolation than fine-grained or cemented soils. However, a percolation <br />test is the only accepted method for determining the suitability of the soils for a septic <br />disposal area. Percolation test results are discussed in the following section. <br />Percolation Test <br />A shallow percolation test was conducted on the homesite parcel of the Site. The soil <br />boring discussed above was used for the percolation test hole. Live Oak's percolation <br />test procedures conformed to San Joaquin County Environmental Health Department <br />Policy. <br />Preparation and Presaturation of Percolation Test Holes <br />After Live Oak's borings were advanced by hand auger and the soil logged, the test <br />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 hole approximately 24 hours prior to the <br />percolation testing. The 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 hole was found to <br />be intact and dry. <br />Percolation Test Procedure <br />Live Oak conducted the percolation test for the boring on May 13, 2021. Due to initial <br />percolation rates observed, a one-hour test was selected. Water level measurements <br />were taken every 10 minutes during the one-hour period. The last 30 minutes of the <br />test were observed by Francisco Garcia Ruiz, Registered Environmental Health <br />Specialist at the San Joaquin County Environmental 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, the hole was refilled with water <br />to a level of approximately six inches above the bottom of the hole. <br />LOGE 2124 Page 6 <br />