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Mr. Robert Doss <br /> September 6, 1996 <br /> Page 3 <br /> TPH contamination detected in adjacent "upgradient" <br /> wells. This position remains in concurrence with <br /> PG&E' s discussion presented in Section 4 . 0 of the <br /> October 1992 quarterly groundwater monitoring report <br /> that "concentrations detected (upgradient) may <br /> represent . . . an averaging effect from variations in <br /> hydraulic conductivity or groundwater gradient <br /> directions resulting from variations in local <br /> groundwater pumping over time" . Therefore, the <br /> Agencies do not believe that this position is <br /> "highly speculative" as stated in your letter. <br /> Please address the above within two weeks from <br /> receipt of this letter. If you have any questions, <br /> please contact the Project Manager, Mr. Fernando Amador, <br /> at (916) 255-3737 . <br /> Sincerely, <br /> JAI <br /> Frances E. Anderson, Chief <br /> Sacramento Responsible Parties Unit <br /> Northern California-Central <br /> Cleanup Operations Branch <br /> CC : Ms. Patricia Sullivan <br /> PG&E <br /> 77 Beale Street, Room 2427C <br /> San Francisco, CA 94106 <br /> Ms . Paula Bolio <br /> CH2M Hill <br /> 111 Broadway, Suite 1200 <br /> Oakland, California 95607-4046 <br /> PA.lew <br /> 1:\ftsx0820.wpd <br />