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Iff <br /> Chevron U.S.A. <br /> Page 3 <br /> Seven groundwater monitoring wells were installed at the subject property between <br /> 1986 and 1986. Groundwater Technology Inc. installed three wells in October 1986 and <br /> Weiss Associates constructed four wells in January 1988. The groundwater monitoring <br /> wells were understood to have been installed in response to product line leakage which <br /> was discovered in 1984. Some preliminary evaluation of groundwater quality was <br /> conducted by chemical analysis of quarterly groundwater samples obtained from <br /> monitoring wells in 1988 through 1989. The quarterly groundwater test results are <br /> presented in Table J of this report. <br /> In response to the contamination noted in subsoils at the time of the tank <br /> removals in mid-1988,Chevron requested that Dames&Moore prepare a remedial action <br /> 0 . ,� plan for subsoil contamination at the subject property. Discussions with Mr. Gordon <br /> r- <br /> Boggs of the California Regional Water Quality Control Hoard (RWQCB)yielded <br /> e <br /> information that at that time,the RWQCB was not concerned with low levels of <br /> contamination detected in monitoring wells at the subject property. The RWQCB felt <br /> r that remediation of the subsoil contamination noted from the underground tank removals <br /> at the subject property should be addressed. <br /> At Chevron's request, a letter dated October 4, 1988 was prepared by Dames & <br /> Moore detailing a soil vapor extraction remedial plan proposed and developed by Dames <br /> z <br /> & Moore. The October 4, 1988 letter was submitted to Gordon Boggs of the Regional <br /> Water Quality Control Board for review, the letter generally addressed a two-phase <br /> plan for the implementation of a soil vapor extraction system, permitting, and <br /> monitoring of system performance. <br /> _., isoaa-xos-a44 <br /> D.;pis:s ti. Mocra- <br />