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. . <br /> Rli <br /> On <br /> R*i <br /> M Chevron/South Center a <br /> September, 1990 <br /> The wells will be developed using a truck-mounted <br /> development system. The wells will be subjected to alternate <br /> rounds of bailing and surging until the water extracted from the <br /> wells is relatively free of silt. <br /> Water generated during well development will be placed in <br /> 55-gallon steel drums and stored on site pending proper disposal. <br /> WELL MONITORING AND SAMPLING <br /> u After development, the wells wil]. be monitored to determine <br /> _ depth-to-groundwater and to check for the possible presence of <br /> separate-phase floating hydrocarbons. Water-level data will be <br /> combined with wellhead elevations to determine the groundwater <br /> gradient direction and magnitude. <br /> Any wells that do not contain separate-phase floating <br /> hydrocarbons will be sampled in accordance to the procedures <br /> presented in Appendix A. Samples will be collected and analyzed <br /> ;it the GTEL facility in Concord, California for the presence of <br /> _ BTEX and TPH-as-gasoline using modified EPA Methods 5030/$020/ <br /> T. 8015. The sample collected from the well nearest the former <br /> waste-oil t-ink location will be sampled for total oil-and-grease <br /> (TOG) and TPH-as-waste-oil using EPA Method 503 B and E. <br /> During sampling, Groundwater Technology plans to determine <br /> the levels of dissolved oxygen and carbon dioxide in the <br /> groundwater by means of field measurements. These data could be <br /> useful in assessing possible groundwater-remediation options. <br /> =� GROUNDWATER <br /> :.. .:.......:..: TECHNOLOGY,INC. <br /> i <br />