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r <br /> Chevron/W. Benjamin Holt Drive <br /> June 1990 9 <br /> NEIL MONITORING AND SAMPLING <br /> z <br /> After development, all seven groundwater monitoring wells: <br /> will be monitored to determine depth to groundwater and to check <br /> I for the possible presence of phase-separated floating <br /> hydrocarbons. These data will be used to determine the <br /> groundwater gradient. <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 Conccrd, 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 /> F <br /> groundwater by means of field measurements. These data could be <br /> 3 useful in assessing possible groundwater remediation options. <br /> z <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 /> �i <br /> recommendations for any additional assessment,, possible <br /> remediation strategies, and/or additional recommended field <br /> investigations will be presented. <br /> , � GROL'NCUATER <br /> _..-..: TECHNOLOGY,INC. <br />