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IiKI;Adadu Yemane <br /> f <br /> T 0: C 0 MARKETING COMPANY y . Project Man <br /> ager <br /> � Jy- h Coast <br /> Region <br /> C June 13i 1997 <br /> Mr. Ronald Rowe, Sr. <br /> Site Mitigation Unit <br /> San Joaquin County Public Health Services <br /> 30 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 ) <br /> Unocal Service Station#5886 ! <br /> 2701 March Lane <br /> Stockton, California <br /> Dear Mr. Rowe: <br /> I <br /> Attached for your review and comment is a report entitled Supplemental Evaluation and Investigation <br /> Report,dated May 28, 1997, for the above referenced site. The report was prepared by Environmental t <br /> Resolutions,Inc. (ERI)of Novato, California, and details the result of the supplemental investigation to <br /> further evaluate MTBE in groundwater at the subject-site. <br /> Please note Sequoia Analytical Laboratory analyzed soil samples collected from the borings two days <br /> passed the 14 day holding time. According to Sequoia, "although the EPA has set 14 day as the industry i <br /> standard for the total petroleum hydrocarbon analysis, a significant loss would not occur within the 48 <br /> hours prior to analyses of the soil samples. Proper storage conditions were maintained". To add further <br /> assurance that the results ate valid, see Sequoia's laboratory narrative. Additionally, Sequoia reported <br /> groundwater samples from four wells contained sodium sulfate originating in the laboratory rather than <br /> the diesel range hydrocarbons reported. <br /> Please note this project will be transferred to Mr. Ed Ralston of Tosco Marketing Company. Mr. Ralston <br /> can be contacted at(5 10)277-2311. <br /> Should you have any questions, please do not hesitate to contact me at the address and phone below. <br /> Sincerely, <br /> Adadu Yemane <br /> Attachment: <br /> cc: Dave. Camille, Tosco Marketing Company <br /> Ed"Ralston, Tosco Marketing Company <br /> Keith Romstad, ERI <br /> File SS#5886 <br /> 2000 CROW CANYON PLACE, SUITE 400 <br /> SAN RAMON, CA 94583 <br /> TEL (510)277-2383 FAX (510) 277-2361 <br /> a <br />" 1 <br />