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:E <br /> i� <br /> Chevron U.S.A. <br /> Page 21 <br /> 8.2 D-r-Q!Jr�water C ll I Si for to_ 990 <br /> Groundwater sampling was conducted by others from October 1986 to October 1989. <br /> The results of this sampling is summarized in Table V, below. These samples were <br /> obtained from monitoring wells MW-1, PAW-2, MW-a, MW-4, MW-5, MW-6, and MW-7. These <br /> r� wells were constructed by Groundwater Technology Inc. and Weiss Associates from 1986 <br /> EA <br /> through 1988. <br /> v+e <br /> Most of the resul-s appearing in Table V is a reprint of Weiss&Associatas <br /> ;.; November 14, 1989 report. This table presents a summary of the analytical results for <br /> benzene,toluer:;, ethylbenzene,xylenes and total petroleum hydrocarbons. <br /> k" Weiss&Associates collected groundwater samples from monitoring wells at the <br /> subject site during most of 1988 and 1989. A portion of these wells had gone dry due <br /> to the declining water surface elevation in recent years. The quarterly monitoring <br /> performed by Weiss&Associates on October 5, 1989, sampled only wells MW-2 and MVV-5. <br /> The remaining wells,MW-1, MW-3, MW.-4, MW-6, and MW-7 were not sampled due to being <br /> f dry or had insufficient recovery once the wells were purged. <br /> i 4 <br /> ° Monitoring well MW-2 had shown a significant increase in hydrocarbon chemical <br /> constituents during its last three samplings(.July 19, 1989;September 8, 1989 and <br /> October 5, 1989), The wells constructed as part of this report (MW-2A, IJIW-4A, MW-5A, <br /> MW-8, MW-9, MW-10, and MW-11)were placed to help delineate any lateral movement of <br /> the contaminate. <br /> r. 16000-206-044 <br />