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ACTON • MICKELSON - van DAM, INC. Consulting Scientists, Engineers, and Geologists July 21, 1994 RECEIVEU J U L 2 0 1994 ENVIRONMENT HEALTH Mr. Kenneth Earnest PERMIT/SERVICES Ultramar Inc. 525 West Third Street Hanford, California 93230 19005.1317 Subject: Second Quarter 1994 Remediation Status Report--Former Beacon Station #494 Located at 2185 East Fremont Street, Stockton, California Dear Mr. Earnest: Acton • Mickelson • van Dam, Inc. (AMV), prepared this letter to document remediation activity at the referenced site during the second quarter of 1994, specifically, the period from March 25 to June 22, 1994. Table 1 summarizes the system performance. Figure 1 graphically presents hydrocarbon extraction rates versus time. The system ran a total of 85 days in the 89-day reporting period for an operating efficiency of 96 percent. Following is a month-by-month summary of activity. March 25 to April 29, 1994 The system ran continuously during the 35-day reporting period. Over the 35-day operating period, the system extracted an estimated 1,190 pounds of hydrocarbons (based on field readings). Laboratory results for influent air bag samples collected on April 13 and 29, 1994, indicated the benzene concentration was below the detection limit. The resulting estimated benzene extraction was 0.0 pound. As of April 29, 1994, the cumulative totals for extraction amounts since start-up of the system were 10,070 pounds of hydrocarbons and 210 pounds of benzene. April 29 to May 31, 1994 The system operated for 28 days during the 32-day observation period, down 4 days apparently because of a power failure. Over the 32-day operating period, the system extracted an estimated 1,000 pounds of hydrocarbons (based on field readings). The laboratory results for influent air hptu 13.mi 4511 Golden Foothill Parkway,Suite 1 (916) 939-7550 EI Dorado Hills,California 95762 Fax(916)939-7570