SITE INFORMATION AND CORRESPONDENCE

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PUBLIC-HEALTH SERVICES SAN JOAQUIN COUNTY ENVIRONMENTAL HEALTH DIVISION y Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer 304 East Weber Avenue, Third Floor • Stockton, CA 95P_2 1ED 209/468-3420 PAUL SUPPLE JUL 2 1 M7 ARCO PRODUCTS COMPANY PO BOX 6549 MORAGA CA 94570 RE: ARCO Station #4493 SITE CODE: 231042 205 North Center Stockton CA 95202 San Joaquin County, Public Health Services Environmental Health Division (PHS/EHD) has reviewed historic information pertaining to the above referenced ARCO facility and to the neighboring former Shell Oil facility. PHS/EHD has prepared the following comments for your consideration and response. Tank Testing History PHS/EHD's records indicate that three 12,000 gallon dual walled fiberglass underground storage tanks were installed December 1984. The first precision tests which PHS/EHD has record of occurred on October 6, 1986 and the results indicated that the tanks exceeded the maximum loss for a tight tank. The tanks were retested on January 15, 1987. The retest results indicated that the tanks were tight; however, the retest was not a full system test. The tanks were next tested on December 16, 1987 and all but tank#2 (center) passed the integrity testing. A vapor line was repaired and tank#2 was retested on December 23, 1987. The retest results indicated that tank#2 was tight. Again on December 30, 1987, the tank was retested and passed. On January 5, 1989 , all three tanks and piping passed precision testing. On May 30, 1989, the leak detectors were tested and passed. On August 17, 1990, the lines were tested and passed. On October 18, 1991, the piping was tested and passed. On March 24, 1992 , the line and leak detectors were tested and passed. During 1992 continuous monitoring of the tanks was initiated. On March 19, 1993, two leak detectors failed testing; however, following replacement and retesting, the leak detectors passed. On November 4, 1993 the test of the tank#2 line failed. The retest following the replacement of an O-ring passed. No further testing records were available in PHS/EHD's file. In 1996, the annular fluid was reported leaking from tank#3. The tank was reportedly pumped and piping evacuated and plugged or capped . A temporary closure plan was submitted to PHS/EHD January 1997 and which expires on January 15, 1998 at which time the tank system must be upgraded to 1998 requirements. Unauthorized Release Reporting (UAR) History On June 3, 1991, an UAR was filed in response to a drive off. The dispenser was reportedly repaired. On February 1, 1992, a Proposition 65 Notification was filed in response to a drive off. On February 20, 1992, an UAR was filed in response to a drive off on February 19, 1992. On November 1, 1993, an UAR was filed in response to a drive off_ The gasoline reportedly traveled into the sewer. Fish and Game was notified. On November 2, 1993, a Proposition 65 Notification was filed in response to the November 1, 1993 drive off_ Approximately 100 gallons of gasoline product was discharged. The Fire Department responded to contain the discharge. A Division of San Joaquin County Health Care Services