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S <br /> i <br /> Chevron/W. Benjamin Holt Drive 9 <br /> i` Uune 1990 <br /> is <br /> J <br /> WELL M.?NITORING AND SAMPLING <br /> 5 <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 /> hydrocarbons. These data will be used to determine the i <br /> groundwater gradient. <br /> !i <br /> Any wells that do not contain phase-separated floating <br /> hydrocarbons will be sampled. Water 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 /> i During sampling, Groundwater Technology plans to determine <br /> + the levels of dissolved oxygen and carbon dioxide in the <br /> t groundwater by means of field measurements. These data could be <br /> useful in assessing possible groundwater remediation options. <br /> I <br /> # rXPORPING L <br /> j <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 /> f 1 include details of waste disposal. A separate lett�:r presenting <br /> recommendations for any additional assessment, possible <br /> remediation strategies, and/or additional recommended field <br /> investigations will be presented. <br /> 'f <br /> 1 <br /> GROUNDWATER <br /> TECHNOLOGY;INC. <br /> s — <br />