SITE INFORMATION AND CORRESPONDENCE

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MEMORAN--DUM JZ ...} CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD - �TRAL VALLEY REGION 3443 Reutter Road Phone: (916) 361-5600 Sacramento, CA 95827-3098 ATSS Phone: 8-495-5600 T � T0: Antonia C.J. Vors " FROM: John J. Tomko I DATE: 8 November 1989 SIGNATURE• SUBJECT:. -PETROLEUM CONTAMINATED GROUND WATER AT TRACY BLVD. AND GRANT LINE ROAD, TRACY On 6 November 1989 we received a complaint from the San Joaquin Co. Health Department regarding a petroleum product contamination of shallow ground water near the intersection of Tracy Blvd. and Grant Line Road in Tracy. Apparently PGE was tapping into a,natural gas main and fumes were detected and product was noted on the surface of the standing water within their trench. Work has been discontinued for fear of ignition. I talked to a Mr. Mike Long of PGE on 8 November regarding this incident. I explained to him that we were working on the Chevron Pipeline Co. pipeline spill at Corral Hollow Road and Grant Line Road (Tracy Orchard Project) . He said their incidence was approximately 1 mile east of the Chevron spill . Water samples were taken and I informed him that they should be analyzed for BTEX and TPH. I asked him to send us copies of the analyses and a site location map. He agreed. PGE is reluctant to continue work at this location and wish to fill in the trench. I told him we would have no problem with this. He also inquired if it would be ok to continue working if they dewater the trench and dispose of the water as a hazardous waste. I again told him that it would be ok. He also said that he had talked with the City of Tracy and that they may be able to dispose of the water at their treatment plant. I informed him that if they need to finish the job at this site, and that if dewatering would be necessary, that we would work with PGE, and the county, in arriving at a suitable disposal location for the extracted water. The analyses is on a 48 hour turnaround so I anticipate getting the results early next week. Depending on the results and PGE plans to continue work I will assist PGE, in cooperation with the county, in a short-term solution to this problem. However, the long-term implications will have to be addressed. It is possible that the Chevron Pipeline Co. spill one mile to the west is the cause of this contamination: Product could have migrated within the backfill towards Tracy Blvd. In addition it is possible that there is a leak in the line at or near Tracy Blvd. However, there are two underground tank sites in the vicinity. Once the results are in and the short-term problem with the gas line tap is resolved, it may be necessary to meet with the county to discuss the assessment of the site and the identification of potentially responsible parties. It's likely that Chevron may be asked, by us, to investigate this incident either in conjunction with the Tracy Orchard project, or as a separate spill/leak. V