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7810 Thornton (toad,Stockton,California <br /> 2.0 SUMMARY <br /> Specific work performed during this Preliminary Investigation conducted by <br /> Augeas Corporation included: <br /> 1. Preparation of a Site Investigation Workplan,a site-specific Health and <br /> Safety Plan, and submittal of boring permits. <br /> 2. Drilling of four exploratory soil borings with a truck-mounted drill rig. <br /> 3. Collection of soil samples at 5-foot intervals in the soil borings,from <br /> five feet below ground surface to a depth of approximately 50 feet. <br /> Continuous lithologic logging of each of the boreholes and the field <br /> screening of all samples collected with a 580B OVM photoionization <br /> detector (PID). <br /> 4. Analysis of soil samples for volatile aromatic compounds including <br /> benzene, toluene, total xylenes, and ethylbenzene (BTEX) and total <br /> petroleum hydrocarbon products (TPHg) in the gasoline range; se- <br /> lected samples were submitted for oil and grease analysis(EPA Method <br /> 41.8.1). <br /> 5. Preparation of this technical report. <br /> In summary,minor soil contamination remains in the vicinity of the former tank <br /> excavation, most likely as a result from the periodic leakage or spillage of <br /> petroleum fuels from a surface pump and/or fuel dispenser. The near surface <br /> soils in the original storage tank excavation area still contain minor concentra- <br /> tions of highly weathered(old)petroleum components.This subsurface inves- <br /> tigation identified that minor soil contamination restricted primarily to the <br /> immediate area of the former tank excavation,and was not found below a depth <br /> of approximately 5 to 7 feet beneath the ground surface in borings SB-1 and SB- <br /> 2. <br /> Project Number: USD070192 Page 2 of 9 <br /> i <br />