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Mr. Kyle Christie <br /> January 24, 1996 <br /> Page 3 <br /> be a result of the proximity of the site to the Port of Stockton and the activities associated with <br /> tharport. The site may have been constructed on backfill materials such as dredge tailings <br /> from the shipping port. ARCO Facility 5450 was constructed and operationalafter leaded <br /> gasoline sales were discontinued in California, therefore it is unlikely the presence of lead is a <br /> result of activities associated with the ARCO facility. <br /> Conclusions <br /> Based on the analytical results of the soil samples collected during this investigation, <br /> hydrocarbon impacted soil was present only in the location of product dispensers one and two. <br /> Approximately 35 cubic yards of soil was excavated from the affected area. Analytical results <br /> of soil samples collected from the.'base (T-14-11.5A) and south side (T-12) of the excavation <br /> indicate that only minor concentrations of one or more BTEX constituents remain in place in <br /> this location. Based on the results of the TCLP analysis o TPH-G and BTEX and sample <br /> T-14-11.5A, the potential for hydrocarbons present at the base of the excavated area to leach <br /> into the groundwater is very low or non-existent. Based on information obtained by the <br /> County, groundwater in the area of this site is approximately 12 feet below grade. <br /> Groundwater was not encountered during this investigation. <br /> If you have any questions regarding this report, please contact me at (916) 4440123. <br /> Sincerely, <br /> BROWN AND CALDWELL <br /> Steve Misner Pat G. Cullen <br /> Project Manager California Registered Geologist#4932 <br /> SM:DA:ksc <br /> Enclosures <br /> cc: Mr. Michael Infurna, San Joaquin County Public Health Services, <br /> t Environmental Health Division <br /> Use or disclosure of data continued on this sheet is subject to the restriction specified at the beginning of this <br /> document. <br /> 2417\R EPO R TSPS U M M.DOC <br />