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r <br /> BRIAN COBB <br /> PAGE 2, <br /> r <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 /> be 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 <br /> more detail, please contact <br /> Linda Turkatte, Senior REHS, at (209) 468-3441 <br /> Donna Heran REHS Director <br /> Environmental Health Division <br /> Linda Turkatte, Senior REHS Diane M inson, 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 Krofoff, Belcher, Smart, Perry and Christopherson, Kim Smith <br /> r <br /> i <br /> � r 1 <br /> y ' <br /> r <br />