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Discussion of Soil Lithology Based on the soil observed in the borings, there appears to be poor to moderate potential for percolation in the shallow soil zones and moderate potential for percolation in the deep soil zones at the test locations. Sandy soils generally have a much greater potential for percolation than fine-grained or cemented soils. However, a percolation J test is the only accepted method for determining the suitability of the soils for a septic disposal area. Percolation test results are discussed in the following section. Percolation Test Shallow percolation tests were conducted on proposed Parcels 1 through 5 and 8 of the Site. Shallow and deep percolation tests were conducted on proposed Parcels 6, 7 and <y 2S 9 through 15 of the Site. The soil borings discussed above were used for the percolation test holes (Plate 10). Percolation test procedures conformed to San Joaquin County Environmental Health Department policy. Preparation and Presaturation of Percolation Test Holes After the borings were advanced by hand auger and the soils logged, the test holes were completed for the percolation tests. Approximately one inch of pea gravel was placed in the bottom of each open soil boring, followed by a 1.5-inch diameter PVC pipe with perforations on the bottom. Pea gravel was then used to backfill a few inches of the annular space. Live Oak presaturated the percolation test holes approximately 24 hours prior to the percolation tests. Each hole was filled with water to a height of 12 inches above the bottom of the boring for the presaturation. On the day of testing, the holes were found to be intact; all the holes were dry except the shallow holes on Parcels 10, 12, 13, 14, and 15. Percolation Test Procedure Live Oak conducted the percolation tests for the borings on September 11, 12, and 18, and December 31, 2014, and on January 8, 21, and 27, 2015. Due to soil conditions observed, four-hour tests were selected. Water level measurements were taken every 30 minutes during this four-hour period. The tests were observed by Michael Escotto, Ted Tasiopoulos, or Frank Girardi, Senior Registered Environmental Health Specialists at the San Joaquin County Environmental Health Department. An electronic well sounder with a depth accuracy of 1/100`h foot was utilized for the water level measurements. The water level was measured against a fixed reference point on the well casing. Measurements were recorded on the data sheet in decimal feet. When necessary after measuring the water level, the hole was refilled with water to a level of six inches or more above the bottom of the hole. LOGE 1419 Page 9