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0 • <br /> Pacific Gas and Electric Company Environmental Services <br /> P.O.Box 7640 <br /> San Francisco,CA 94120 <br /> 415/973-7000 <br /> Direct Dial 415/973- <br /> Telecopy 415/973-9201 <br /> October 30, 1998 <br /> James L. Tjosvold, P.E. NOV 0 2 1998 <br /> Chief, Site Mitigation Branch <br /> r California Environmental Protection Agency ENVIROMVENTALHEALTFI <br /> Department of Toxic Substances Control PERMIT / SERVICES <br /> 10151 Croydon Way, Suite 3 <br /> Sacramento, CA 95827 <br /> Attention: Mr. Fernando Amador <br /> Dear Mr. Tjosvold: <br /> Re: Docket#HSA 90/91-08 - Stockton Former Manufactured Gas Plant Site <br /> Subject: Groundwater Monitoring Frequency Decision Tree, <br /> PG&E Stockton Former MGP Site <br /> Attached for your review and approval is a proposed "Groundwater Monitoring <br /> Frequency Decision Tree" for Pacific Gas and Electric Company's (PG&E's) Stockton <br /> former Manufactured Gas Plant(MGP) site. This decision tree presents a flow chart for <br /> automatically modifying the frequency at which a groundwater monitoring well in <br /> PG&E's groundwater monitoring program is sampled. <br /> Please call me at (415) 973-6254, if you have any questions or require additional <br /> information. <br /> Sincerely, <br /> Patricia E. Sullivan <br /> cc: Mr. Gary Carlton, Executive Officer <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3098 <br /> Attention: Ms. Wendy Cohen <br />