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TL 489-0589-02 Page 2 <br /> This RI was conducted by the Environmental Engineering and <br /> Analytiical Chemistry Divisions of The Twining Laboratories, Inc. <br /> (Twining) , located in Fresno, California. <br /> 2 .0 PURPOSE AND SCOPE OF. INVESTIGATION <br /> 4 The purpose of this remedial investigation was to determine if <br /> petroleum product constituents were present in the shallow on-site <br /> soils in the reported vicinity of the former underground storage <br /> tank. <br /> This RI was conducted in accordance with the RI warkpl.an dated <br /> May 25 , 1990. The proposed scope of.- work to . achieve the stated <br /> purpose are summarized as follows: <br /> o A workplan, dated May 25, 1990, was prepared by Twining <br /> and submitted to the San. Joaquin Environmental. Health <br /> Department (SJEHD) ; <br /> a A subsurface assessment permit was issued by the SJEHD <br /> prior to the initiation of the field investigation; <br /> o Four exploratory soil borings were drilled on-site. Soil <br /> samples,collected from these soil borings, :were analyzed <br /> for Benzene (B) , Toluene (T) , Ethylbenzene (E) , Xylenes <br /> (X) , Total Petroleum Hydrocarbons-Gasoline (TPH-G) , and. <br /> TPH-Diesel (TPH-D) ; <br /> o The data obtained from . Twining's field and analytical <br /> o determine if the shallow <br /> evaluated t <br /> investigation :were " <br /> on-site soils in the reported vicinity ' of the former <br /> underground storage tank had-detectable concentrations of <br /> petroleum product constituents; and <br /> o This report was prepared to present the investigative <br /> methods, the subsequent findings, an evaluation of the <br /> findings, and. related conclusions-'and recommendations. <br /> Fresno Modesto Visalia Bakersfield <br />