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BRIAN COBB <br /> PAGE 2 <br /> It was also discussed that should the review of the site cross sections Indicate the <br /> existing monitoring wells to be inadequate for use in testing the feasibility of vapor <br /> extraction technology, sufficiently constructed vapor extraction test wells will need to <br /> rbe installed <br /> Additionally, PHS/EHD requested Brown and Caldwell contact the Central Valley <br /> Regional Quality Control Board for approval to inject helium gas into groundwater <br /> ' If you have any questions or wish to discuss this letter in more detail, please contact <br /> Linda Turkatte, Senior RENS, at (209) 468-3441 <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Linda Turkatte, Senior REHS Diane M Ji n, REHS <br /> Site Mitigation Unit Supervisor <br /> LT <br /> C CVRWQCB, Beth Thayer ,c Kenneth Hafer <br /> C Glen A McGill, Inc c Brown and Caldwell, Todd Miller <br /> c Kroloff, Belcher, Smart, Perry and Christopherson, Kim Smith <br /> it r I <br /> r , <br /> r ' I <br /> r <br /> I I <br /> I <br /> it f F I� I fI r <br /> III I It r I f I I <br /> r r r <br />