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PACIFIC <br /> ENVIRONMENTAL <br /> GROUP INC.' <br /> February 4, 1997 <br /> Project 310-040.5A <br /> Mr. Bob Boust <br /> Unocal Corporation <br /> 2000 Crow Canyon PIace, Suite 400 <br /> San Ramon, California. 94583 <br /> Re: Remedial Action Performance Summary- October through December 1996 . <br /> Unocal Service Station 2859 <br /> 1665 Pacific Avenue <br /> Stockton, California <br /> Dear Mr. Boust: <br /> This letter presents a remedial action performance summary for the site referenced <br /> above. Attachment A presents a system performance summary which includes key <br /> operating parameters. Certified analytical reports with chain-of custody documentation <br /> are included as Attachment B;and field data sheets are presented as Attachment C. The <br /> status of recent remedial activities is--presented below. <br /> Remedial Performance Evaluation <br /> • . During the current reporting period, the soil vapor extraction system was <br /> approximately 73 percent operational. System down time was due to propane tank <br /> refueling and to investigate air dischargepermit compliance._The system was shut <br /> down on November 6, 1996 at the end of the long-term pilot test. x <br /> • Samples taken on October 23, 1996 showed a destruction efficiency below�the <br /> permitted limit of 95 percent and exceeded the total daily VOC emissions of <br /> 2 pounds per day. Confirmation samples were taken on November 6, 1996 and the <br /> system was shut down..Confumation sample results indicated that the system was" <br /> not-fulfilling perifift requirements.-In.a letter dated December 20, 1996,,PACIFIC <br /> 'notified the San Joaquin Valley Unified Air Pollution Control District of the emission <br /> problem and of the pilot test completion. <br /> 2025 Gateway Place, Suite 440, San Jose, California 95110 (408) 441-7500 FAX (408)441-7539 <br />