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Chevron U.S.A. <br /> Page 8 <br /> Excavation of soil in the vicinity of DI-2 commenced on <br /> January 24, 1990. Field screening of soils exposed in <br /> excavation DI-2 indicated that detectable concentrations of <br /> petroleum hydrocarbons were present at a depth of about 20 <br /> feet. Based on the field screening, the excavation was <br /> enlarged laterally and vertically. On January 25, 1990 the <br /> limits of excavation DI-2 encroached into the area previously <br /> underlying DI-3 (Photo 2) . To provide access for the <br /> excavation equipment to the bottom of the hole, a ramp was <br /> created on the east side of the excavation (Photo 3) . The <br /> ramp accessed a bench located about 7 feet below grade. <br /> Three soil samples were obtained from the limits of <br /> excavation on January 26, 1990, between the location of DI-1 <br /> and DI-2. The samples were obtained on the excavation <br /> sidewalls and from the bottom of the excavation. Results of <br /> analyses on the samples are presented in Table I-B. <br />• 16000-250-044 <br /> Corrected <br />