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Pacific Gas and Electric Company 1401 Fulton Street Fresno,CA 93760 2091443.4600 July 7, 1988 David Carls San Joaquin Local Health District 1= r P.O. Box 2009 ENVlk( rV; ,,Tql Stockton, CA 95201 FERr^,11EKv1 i cES - S HEALTH Dear Mr. Carls: We have received the results of the preliminary soil investigation performed by Groundwater Technologies, Inc. to determine the feasibility of removing subsurface hydrocarbons at y PG&E's Lathrop Dehydrator Station. This report indicates the petroleum-range hydrocarbons found underground at the Lathrop Dehydrator could readily be degraded in place. We are currently reviewing this report and will forward it to you by July 31, 1988. Based on this report, PG&E plans to take the following actions: 1. Resume critical construction activities at the site. Because of the initial uncertainties of this investigation, construc- tion work necessary for the continued safe and efficient sup- ply of natural gas from the Lathrop Dehydrator has been delayed for the last three months. Based on the feasibility study, PG&E feels the continuance of vital construction work at Lathrop will not have an adverse effect on future site remediation efforts. In anticipation of utilizing in-situ biodegradation, an injection gallery will be installed in the same location as the leach line. This injection gallery can be used to pass nutrients into the soil (a requirement of biodegradation) regardless of foundations or other equipment located on the surface. 2. Continue with the soil investigation. With your approval , PG&E will conduct an additional geotechnical investigation to determine the full extent of the petroleum-range hydrocarbons in the soil surrounding the leach line. The investigation will propose additional soil borings and at least one ground- water sampling well . PG&E will utilize this investigation to determine future actions and remediation alternatives.