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Shell Service Station <br /> Page Two <br /> Mr. Infurna responded to the above points in the February 17, 1993, <br /> letter, stating: "the closest boring/monitoring well was placed <br /> approximately 30 feet from the tank pit_ " He again requested a PIER <br /> and gave a 45-day deadline. <br /> The September 16, 1988, AGS report indicates well MW-1 was installed <br /> less than 10 feet south of the tank basin_ A figure from the AGS <br /> report is attached. <br /> Eleven soil and four groundwater samples were analyzed during the AGS <br /> and Aegis investigations. None of the samples indicated <br /> concentrations of total petroleum hydrocarbons, as gasoline, or <br /> benzene above the method detection limits or PQL. The results of <br /> both the AGS and Aegis investigations indicate groundwater beneath <br /> the site does not contain petroleum hydrocarbons tested below the <br /> method detection limits and PQL. <br /> Appendix A of the "Tri-Regional Board Staff Recommendations for <br /> Preliminary Evaluation and Investigation of Underground Tank Sites" <br /> (August 10, 1990) indicates a PIER determines whether groundwater <br /> should be investigated_ It is the opinion of Shell and Aegis that <br /> the absence of gasoline compounds in soil and groundwater samples <br /> collected from the site demonstrates additional investigation is not <br /> warranted. <br /> Again, Shell wishes to resolve this conflict at the county level. <br /> Your attention to this matter is appreciated. If you have any <br /> questions, please call me at (510) 675-6168 <br /> Sincerely, <br /> Z t-rf LA <br /> D. T_ Kirk <br /> Environmental Engineer <br /> Shell Oil Company <br /> Attachment <br /> cc: D. Poulsen, Aegis Environmental, Inc_ <br /> E. Thayer, Central Valley Regional Water Quality Control Board <br />