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Pacific Gas and Electric Company 375 North Wiget Lane,Suite 200 Walnut Creek,CA 94598 510/974-4200 16 January 7, 1998 Mr. Harlin Knoll Public Health Services San Joaquin County Environmental Health Division 304 E. Weber Avenue, 3rd Floor Stockton, CA 95202 Dear Mr. Knoll: Re: Pacific Gas and Electric Company (PG&E) Natural Gas Line 107 Pipe Break The following is a final report for the Pacific Gas and Electric (PG&E) Company's Line 107 Pipe Break which occurred on September 16, 1997. 1 was contacted at approximately 1145 hours on Tuesday, September 16, 1997, of a release of natural gas in progress, at the Line 107 near the Tracy District Maintenance Office on Patterson Pass Road. The actual location was '/2 mile West of Patterson Pass Road between Highway 580 and Highway 205. The cause of the release was due to a Teichert Construction Company scraper using a ripper which punctured the line in two locations. Notifications were made to the State OES, SJC-OES, SJVAPCD, and SJC Environmental Health. I verbally reported the release information and a written follow-up report was sent into the PG&E's Corporate Law Department and State OES—Control Number 97-3634. In addition to the natural gas which had been released to atmosphere, it was determined after the line had been blown down that pipeline liquids (Petroleum hydrocarbons) were also released to the soil. I additionally contacted PG&E's Technical and Ecological Services Department to come out to the site and take samples as well as a hazardous waste clean-up contractor. SJC-Environmental Health's Harlin Knoll came out to assist in the determination of where samples would be taken. The contaminated area was approximately 60' X 250'. It was agreed that there would be five samples of the stockpiled soil and seven confirmation samples taken to determine the extent of the contamination (See attachment 1 for TES report) and required clean-up.