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i 1.0 INTRODUCTfON This report describes the procedures and presents the resuits of cone penetration testing (CP'?and BAT groundwater sampling conducted at Che%ron Station No.9"4275,29M Benjamin Holt Drive,Stockton,California. The objectives of this investigation were: demonstrate the ability of the CPT to characterize the site geology and hydrogeology, and (ii) demonstrate the accuracy of the CPT- installed BAT sampling system relative to the California Code of Regulations (CCB) Title 23 groundwater monitoring well samples. - The field work was perro�med on March 11 and 12, and October 21, 1991. The equipment and procedures used are described in Section 20. Section 3.0 describes the CPT data interpretation methodology. Section 4.0 presents the results of the CPT and BAT tasting and sampling program. CPT data logs are contained in Appendix A. In conjunction with the CPT and BAT Sampling Program,monitoring wells onsite were sampled according to standard protocol to assess the potential use of the BAT system for long term - monitoring. Discussion of the monitoring well construction and installation, the sampling techniques and analytical methods are beyond the scope of this report. However, the general analytical results for the B,T system and for the monitoring wells are discussed in Section 4.0 and conclusions and recommendations are presented in Section 5.0. Complete 3 pendix B. analytical results are presented in Ap j - i i — i f f t - e t J;