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Mr . David L. Brent -2- June 8, 1988 <br /> chromatograph. If we find the SF6 tracer in this vent gas , we <br /> can be certain the. well is reaching as far as that soil probe . <br /> We plan to run the test in July. If you have any questions about <br /> the test or about SF6, please contact Mr . D. H. Mohr at <br /> ( 415 ) 620-4975 . <br /> Sincerely, <br /> D. L. Ely <br /> Encl . - Material Safety <br /> Data Sheet <br /> CC: Mr . David R. Carls <br /> Mr . Craig L. Phillips <br /> Mr . Charles McLaughlin <br />