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First Quarter 2001 Ground Water Monitoring Report <br /> Cleanu and Abatement Order No 5-00-707 EAI Project No 1232 <br /> 4.5 Analytical Testing Results <br /> No MTBE, TBA, DIPE, ETBE, TAME, EDB, ethanol or methanol, above laboratory reporting <br /> limits, were detected in any of the ground water samples <br />' Chloroform was detected in wells MW-24S (14 µg/L) and MW-24D (11 1 pg/L) It is EAI's <br /> opinion that this compound may have originated from tap water used during installation of <br /> these two wells Therefore, it was not included in Table 1 <br /> An increase in hydrocarbon concentration in five Ward wells (MW-1, MW-2, MW-3, MW-4, <br /> and MW-6) to pre-remediation concentrations is probably the result of Ward's terminating <br /> remediation efforts in December 2000, due to Wards filing bankruptcy <br />' Unocal wells MW-12 and MW-19D had a slight increase in hydrocarbon concentration over <br /> the prior quarters testing results In EAI's opinion the increase in these wells is consistent with <br /> seasonal fluctuations typically observed in ground water monitoring wells <br /> The March 2001 shallow and deep zone TPH-G isoconcentration maps are presented in Figures <br /> 9 and 10, respectively Note TPH-G was not detected in any shallow zone well above the <br /> laboratory detection limit of<50 µg/L <br /> The March 2001 shallow and deep zone benzene isoconcentration maps are presented in <br /> Figures 11 and 12, respectively Benzene was not detected in any shallow zone well above the <br /> laboratory of<1 µg/L <br /> 46 Future Activities <br /> The next quarterly ground water monitoring for the site is scheduled for June 2001 A report <br /> documenting results of the ground water monitoring will be submitted to the RWQCB by July <br /> 15, 2001 <br /> The results obtained from completing the installation of additional site wells (see Section 1 1 2) <br /> and this monitoring event are being used to determine what remedial actions are required for <br /> the Unocal site A remedial action plan for the Unocal site will be submitted to the RWQCB <br /> by May 31, 2001 <br /> e <br /> 0 <br /> 6HM 1272RDIl I 8 <br />' ENVIRONMENTAL AUDIT, INC <br />