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PRE-TANK REPLACEMENT Site Assessment Results <br /> 880 VICTOR ROAD LODI, CA. <br /> Aegis Project No. 89-014 <br /> Page 15 <br /> 4.0 DISCUSSION <br /> Fourteen soil borings indicate that the site is underlain by <br /> interlayered sandy silt, silty sand, silt and clayey silt which is <br /> underlain by a sand unit which is laterally continuous beneath the <br /> site. The surface of the site is paved with approximately 3 inches of <br /> asphalt. <br /> Soil borings B-1 through B-4 were drilled were drilled to a depth of <br /> 21. 0 feet below grade to assess the native soil conditions in the <br /> vicinity of the existing underground fuel-storage-tanks. Soil borings <br /> B-7 through B-14 were drilled at the location of the proposed tank <br /> excavation to depths ranging from 11. 0 to 16. 0 feet below grade. The <br /> purpose of soil borings B-7 through B-14 was to determine if <br /> subsurface structures were present and to confirm soil conditions at <br /> the location of the proposed tanks. The locations and depths of soil <br /> borings B-7 through B-14 and the sampled intervals were selected to <br /> collect data needed to fulfill the purpose of the borings. Soil <br /> borings B-5 and B-6 were drilled to assess the soil conditions along <br /> the product lines at the pump islands. <br /> Ground water was not encountered in any of the soil borings. <br /> Background information indicates that ground water is less than fifty <br /> feet below grade in the area of the site. <br /> PID readings and odor observations did not indicate the presence of <br /> petroleum hydrocarbons in soils beneath the site. <br /> Fourteen soil samples, one from each soil boring, were submitted for <br /> analysis of aromatic volatiles, total lead and TPH. Benzene, <br /> chlorobenzene, 1, 2-dichlorobenzene, 1, 3-dichlorobenzene, 1, 4- <br /> dichlorobenzene and TPH were not found in any of the samples. <br /> Soil sample B8/1 collected from soil boring B-8 at a depth of 10 feet <br /> below grade contained . 002 ppm, ethylbenzene, . 006 ppm toluene, and <br /> . 008 ppm xylenes. Soil borings B-7 , B-9, B-13 , B-14 which were drilled <br /> within 15 feet of soil boring B-8 did not contain petroleum <br /> hydrocarbons. The presence of low level petroleum hydrocarbons in soil <br /> boring B-8 does not appear to be representative of soil conditions <br /> beneath the site and may reflect cross contamination. A potential <br /> source of the cross contamination in soil boring B-8 is the overlying <br /> asphaltic pavement which was drilled through to advance the soil <br /> boring and may have been dragged down by the auger. <br />