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Pacific Gas and Electric. Company Environmental Services <br /> P.O.Box 7640 <br /> July 28, 1993 San Francisco,CA 94120 <br /> 415/973-7000 r , <br /> Direct Dial 415/973- ,p <br /> Telecopy 415/973-9201 W <br /> Anthony J. Landis, P.E. <br /> �o <br /> Chief, Site Mitigation Branch r <br /> California Environmental Protection Agency `^ <br /> Department of Toxic Substances Control <br /> 10151 Croydon Way mm <br /> Sacramento, CA 95827 ca n <br /> ' o + <br /> Attention: Mr. Fernando A. Amador <br /> Re: Docket #HSA 90/91/08 -- PG&E Stockton Former Manufactured Gas Plant <br /> Site <br /> Dear Mr. Landis: <br /> This letter addendum supplements the Final Workplan -- Phase III Groundwater <br /> Investigation (Workplan), dated July 20, 1993, for PG&E's Stockton Former <br /> Manufactured Gas Plant Site, and reflects those changes and points of clarification <br /> discussed in the DTSC/Regional Water Quality Control Board/PG&E conference call <br /> of July 27, 1993. <br /> As we agreed: <br /> A new Zone B monitoring well, MW-17, will be installed during Phase <br /> IIIc of the work; the final location of this well will be determined during <br /> Phase IIIc; <br /> The groundwater monitoring program described in the Workplan will <br /> begin during Phase IIIc and will continue until the Department <br /> determines that the program may be amended or terminated. All <br /> existing monitoring wells will be sampled during Phase IIIa and Phase <br /> IIIc, whereupon PG&E will propose appropriate modifications to the <br /> groundwater monitoring program for future monitoring events. <br /> Attached also is a copy of the overall project schedule which reflects the changes <br /> discussed during the July 27 conference call. <br /> We look forward to receiving your approval of the workplan and schedule. If you have <br /> any questions, please call me at (415) 973-7601. <br /> Sincerely, <br /> Robert C. Doss, P.E. <br /> Project Manager <br /> Manufactured Gas Plant Project <br />