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® Mr. Cecchim June 28, 1993 Page 2 was retrieved, emptied, then filled again. The ground water from this bailer was then decanted into appropriate laboratory supplied glassware. The containers were filled such that no headspace was present in the samples in order to avoid volatilization of the sample. The filled sample was then labeled and placed in a cooler under ice for transport under chain of custody documentation to IESFs California certified laboratory in Feoria A]linois. ]-SIE then documented the sampling procedures on the attached Wen Sampling Field flog. Purge water was stored in labeled drums and remains on site in a secure area of the site. A trip blank consisting of deionized water, was provided by the IESIE laboratory as a check on sample handling procedures. The trip blank accompanied the samples to the laboratory. The ground water sample and trap blank were analyzed at the laboratory for Total Petroleum Hydrocarbons (T?H) as gasoline and diesel using ]EPA Methods 3350.8015 and 5030/8015 Modified, and for Benzene, Toluene, Ethylbenzene, and Xylenes (IBTEX) using EPA Method 8020. Fijn-d nn OThe ground water level in well UST-I on April 28, 1992 was 80.1 feet below the wells top of casing. No free product was observed. 'Fable 1 shows water level measurements and elevation calculations for this well and three others in the vicinity (Figure 1). .Analytical results for well UST-1 are shown on Table 2 and on the enclosed laboratory certificates of analysis Ground water from UST-1 contained detectable concentration of TPH as gasoline at 2,300 micrograms per liter ug/L or parts per billion. BTEX constituents were also reported TPlf-I[ as diesel was reported at a concentration of 47 milligrams per Liter or mg/L or parts per million. The trip blank showed detectable concentrations of toluene and xylenes at 0 8 an 1.6 ug/L respectively. Discussion The ground water elevation as calculated for well UST-1 has increased 2.7 feet relative to that reported for December 1992. This increase is likely due to seasonal precipitation. TPH as gasoline and diesel and toluene, ethyl benzene and xylenes were detectable in well UST-1 at concentrations slightly lower than that reported in December 1992. The concentration of benzene increased slightly when compared to the December 1992 sample result. Benzene is the only component that exceed California regulatory threshold MCL Olinuts for drinking water