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a <br /> i.f <br /> 1.0 INTRODUCTION <br /> Mobil Oil Corporation retained Alton entalesite n <br /> December 31, 1496 to perform a supe 500 East <br /> investigation at formerCali€ornia.il Oil Bulk <br /> Plant, <br /> site vicinity map is <br /> Grantlixie Road, Tracy, <br /> shown j.n Figure 1 and a site plan is shown in Figure 2., <br /> w <br /> ted to: <br /> This supplemental site invest igationuinsCountycEnvironmental <br /> (l) address the concerns andStheJRegional Water Quality <br /> Health Services (SJCEHS) (2) determine <br /> Control Hoard, Central Valley Region (RWQCB) ; in <br /> the nature and extent of hydrocarbon <br /> constituents an :he <br /> subsurface soil and group investigation or <br /> appropriate course of action for additional <br /> he <br /> remediation in accordance with the req <br /> regulatory agencies. <br /> 1.2 kQ= of Work <br /> exvised and performed the following <br /> Alton Geos <br /> cience sup tigation: <br /> tasks during this supplemental site inves <br /> ® Reviewed avhrmibseforff eldlon activitiesursrtron of <br /> necessary p <br /> ? wells. <br /> nd conve <br /> e Installed addt °intasgrondrwatera monitoring <br /> selected borings <br /> ,.'., a Developed, sampled, and surveyed ground water <br /> monitoring wells. <br /> il and ground water samples for the <br /> e Analyzed sodrocarbon constituents and organic <br /> specified by <br /> �... <br /> compounds. <br /> m Evaluated soil and ground water an <br /> results- <br /> Evaluated <br /> ® Assessed the nature and extent of petroleum <br /> hydrocarbon constituents in the soil and/or ground <br /> water, including ground water flow direction and <br /> -- gradient. <br /> a Prepared this report presenting the results and <br /> findings of the above activities and the appropriate <br /> recommendations. <br /> 1 <br />