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IE ' . 7" <br /> 4 NAN <br /> 1 k <br /> Chevron U.S.A. <br /> Page 4 <br /> In the interim, quarterly monitoring of the existing groundwater monitoring wells <br /> -' at the subject property had shown an increase in the presence of petroleum <br /> hydrocarbons contamination in groundwater. Monitoring well MW-2 had shown an increase <br /> in benzene from less than 0.5 ppb in June 1986, to 13,000 ppb by October 19B9. <br /> Further,the monitoring well chemical analysis data had been interpreted as suggesting <br /> contaminant plume movement in groundwater beneath the subject property alone the <br /> interpreted gradient. <br /> Based upon review of the quarterly monitoring data,Chevron U.S.A.requested that <br /> .J ... <br /> Dames&Moore prepare a workplan to further assess the Groundwater cootamination and <br /> - hydrogeologic conditions beneath the subject property. Results of the quarterly <br /> monitoring to that date are represented by Tab'e V, presented in Section 8.2 this <br /> �. report. <br /> i � <br /> 4.0 PURPOSE AND SCOPE OF SERVICES <br /> r <br /> The Purpose and Scope of our investigation was outlined in Dames&Moore's <br /> proposed workplan, dated September 12, 1989. The groundwater contamination assessment <br /> was proposed as a task-oriented investigation. The purpose of the ground-water <br /> +, contamination assessment was to evaluate the lateral migration of the groundwater <br /> contamination as disclosed by the quarterly monitoring conducted at the subject <br /> property. <br /> L... <br /> 16000-206-044 - <br /> (%ML', MOL)IM <br />