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Discussion of Soil Lithology <br />Based on the soil observed in the borings, there appears to be limited potential for <br />percolation in the shallow soil zone, but moderate potential in the deep soil zone. <br />Sandy soils generally have a much greater potential for percolation than fine-grained or <br />cemented soils. However, a percolation test is the only accepted method for <br />determining the suitability of the soils for a septic disposal area. Percolation test results <br />are discussed in the following section. <br />Percolation Test <br />A shallow and deep percolation test was conducted in the proposed septic repair area <br />of the Site. The soil borings discussed above were used for the percolation testing. <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 and the soil logged, the test holes were completed for <br />the percolation testing. Approximately two inches of pea gravel were placed in the <br />bottom of each open soil boring, followed by a 2.0 -inch diameter PVC pipe with <br />perforations on the bottom. Pea gravel was then used to backfill a few inches of the <br />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, the deep hole was <br />found to be intact and dry; standing water was present in the shallow hole. <br />Percolation Test Procedure <br />Live Oak conducted the percolation test for the borings on March 22, 2022. A standard <br />four-hour test was selected. Water level measurements were taken every 30 minutes <br />during the four-hour period. The last 30 minutes of the test were observed by Francisco <br />Garcia Ruiz, Registered Environmental Health Specialist at the San Joaquin County <br />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 2218 Page 7 <br />