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s <br /> F ` <br /> Mr. Steve Snyder - 2 - November 30, 1990 <br /> 3. Advise us on the disposition-bNhe four dry monitoring wells- MW#.1,'MW #2, MW #3 and <br /> I MW #4. <br /> Monitoring wells MW-1, MW-2, MW-3 and MW-4-are in good condition. The well are sealed, <br /> locked, and water tight. <br /> 4. Inform us as to the :disposition of the stockpiled soils and containerized water generated <br /> during the construction and sampling of.EA-5'and EA-b. <br /> The stockpiled soils generated during the construction of EA-5 and EA-6 have been spread over the <br /> surface of the site following receipt of laboratory analysis results. The results showed no detectable <br /> gasoline contaminants. -The.water generated during:the development and sampling of EA-5 and EA- <br /> 6 has been scheduled to be removed and:disposed of inapproved-disposal.facility following receipt <br /> i of laboratory analysis results. The results showed no detectable gasoline contaminants. <br /> f 5. -Sample EA-6 for fecal coliform during the next round of sampling. <br /> A groundwater.,sample from. EA-6 will-be .analyzed for fecal coliform during the next round of <br /> sampling in February, 199:1 by Chevron's consultant, Alton Geoscience. <br /> 6. The detection limits previously used for soil:and-water sampling were not in compliance with <br /> the LUFT Manual: In the future use the detection`limits listed in:the LUFT Manual for,. <br /> sampling. <br /> It is Chevron's policy to require its.consultants and analytical laboratories to follow the Tri-Regional <br /> Recommendations (revised.August 10, 1990): <br /> i . <br /> 7, End caps on brass tubes-.for soil;samples. were not being taped_ as.required in the LUFT <br /> Manual. Proper sample collection procedures; as listed, in'the LUFT Manual, should be <br /> followed. <br /> i - <br /> E It is Chevron's policy to require its consultants to seal the:end caps on brass tubes for soil samples <br /> with inert tape. <br /> k <br /> 8. Any future site activi_ties..are to be in compliance with tle'LUFT Manual and the Tri- <br /> Regional Guidelines. <br /> E <br /> j It is Chevron's policy to require its.consultants and,analytica_l laboratories to follow the Tri-Regional <br /> Recommendations (revised August`'10, 19.90): <br /> If you have any questions or,comments, please contact Clint Rogers at (415).842-8658. <br /> Sincerely, <br /> E <br /> C.G. TRIMBACH <br /> By <br /> Clint B. Rogers <br /> CBR%}sp:V4-178 <br /> Enclosure <br /> L c: Jinn Maughan, Central Valley Regional Water'Quality Control Board <br />'k Joe Mattos Property Owner. <br /> Stephen.Rosen, Alton Geoscience <br /> Betty Ewen,.Chevron; `Management Specialist <br />