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444 WEST FREMONT STREET <br /> WKA No 1628 44 <br /> February 2, 1996 <br /> Page 2 <br /> disposable bailer Water from the disposable bailer was decanted into appropriate sample <br /> containers provided by the laboratory <br /> The samples were immediately placed in an ice-chest with ice and submitted under chain-of- <br /> custody to a California-certified laboratory for analysis of Total Petroleum Hydrocarbons (TPH) <br /> as gasoline using EPA test method 8415 modified, and Benzene, Toluene, Ethylbenzene and Total <br /> Xylenes (BTEX) using EPA test method 642 <br /> The submersible pump was cleaned with a solution of Liqui-nox and water prior to purging each <br /> well to minimae the potential for cross-contamination All water removed during sampling and <br /> purging operations was placed in sealed and labeled 55-gallon drums and stored on site <br /> Analysis of water samples MW2, SMW2, MW3 and MW6 revealed no detectable concentrations <br /> of TPH or BTEX The one exception for the above four wells was a trace concentration of <br /> xylene reported in well MW6 <br /> Concentrations of petroleum hydrocarbons were detected in the water samples from wells MW1, <br /> MW1, MW4 and MWS A summary of analytical results for ground water samples obtained <br /> from the six on-site monitoring wells and one off-site monitoring well are included as Table 1 <br /> Complete analytical reports and chain-of-custody documentation are included in the appendix <br /> Construction of a sixth site monitoring well was attempted along West Fremont Street on <br /> November 17, 1995 The installation was delayed when unmarked utilities were struck by the <br /> drill rig Construction of this well will commence as soon as issues with the utility company are <br /> resolved In the interim, however, a monitoring well was constructed slightly east of the <br /> northeast corner of Van Buren and West Fremont Streets by Advanced GeoEnvironmental while <br /> working on the adjacent Chase Chevrolet site This well may prove to be directly down-gradient <br /> - = of the former tank pit, however, the apparent groundwater ridge depicted beneath the site on = <br /> January 2, 1996, may have also pushed contamination northerly or northeasterly of the former <br /> tank pit This possibility may help explain the elevated hydrocarbon contamination observed in <br /> monitoring wells MW4 and MW5 <br /> `O% <br /> WALLACE KUHL <br /> S ASSOCIATES INC. <br />