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potentially three hydrocarbon plumes exist to the vicinity of the site, onsite on the northeast <br /> corner of the Mobil property, adjacent to the Ekon property, and adjacent to the Chevron <br /> property (Alton 1990) <br /> April 1990: Alton Geoscience irutiated a ground water monitonng and sampling program <br /> October and November 1991: Alton Geoscience installed AMW-5 and AMW-7 Initial <br /> ground water sampling did not detect concentrations of petroleum-range hydrocarbons at <br /> or above reported detection limits <br /> May 1992: Installation of a ground water automatic recovery system (ARS) for use in <br /> ground water remediation was completed The ARS was started up on May 18, with <br /> Monitoring Wells MW-3, MW-5, and AMW-6 tied into the system Initial ground water <br /> extraction is from MW-5 <br />