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4._, <br /> am i <br /> Chevron/W. Benjamin Holt Drive 9 <br /> June 1990 <br /> W= MONITORING AND SAMPLING <br /> After development, all seven groundwater monitoring wells <br /> will be monitored to determine depth to groundwater and to check <br /> for the possible presence of phase-separated floating <br /> Mhydrocarbons. These data will he used to determine the <br /> groundwater gradient. <br /> Any wells that do not contain phase-separated floating <br /> hydrocarbons will be sampled, hater samples will be taken in <br /> accordance with the procedures presented in Appendix A. Samples <br /> �- will be collected and analyzed for the presence of BTEX and TPH- <br /> as-gasoline. These samples will be analyzed at the GTEL facility <br /> in Concord, California using EPA Methods 5030/8020/8015. <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 /> REPORTING <br /> At the conclusion of all field work, Groundwater Technology <br /> will issue a detailed report that presents the results and <br /> findings of this phase of the site assessment. This report will <br /> include details of waste disposal. A separate letter presenting <br /> recommendations for any additional assessment, possible <br /> remediation strategies, and/or additional recommended field <br /> investigations will be presented. <br /> GROUNDWATER <br /> TEuNoLOG1;INC. <br />