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50 <br /> Supplemental Investigation Work Plan <br /> BP Oil Site No. 11193 <br /> C A M B R I A Stockton, California <br /> February 25, 2000 I{ <br /> Migration Control <br /> 1 <br /> TOSCO will submit a proposal for groundwater extraction. The proposal and subsequent progress <br /> reports will be provided by TOSCO under separate cover. ' <br /> t <br /> Quarterly Monitoring ' <br /> The new wells will be added to the quarterly groundwater monitoring program. Water samples will <br /> be analyzed for TPHg by modified EPA Method 8015,and BTEX and MTBE by EPA Method 8020. <br /> I <br /> SCHEDULE <br /> F l <br /> Upon receiving written work plan approval from the SJCEHD,permits will be acquired, access at <br /> the adjacent car wash will be requested, and the field work will be scheduled. The report will be <br /> submitted approximately six weeks after completing the field work. <br /> ATTACHMENTS <br /> Figure 1 —Area Well Survey <br /> Figure 2—Site Plan <br /> Appendix A—Estimated Hydrocarbon and MTBE Mass Removed . <br /> Appendix B Water Well Drillers Report—Caltrans Well <br /> f Appendix C—Standard Field Procedures for Abandoning Monitoring Wells <br /> Appendix D---Standard Field Procedures for Monitoring Wells <br /> HABritish PetroleunAl 1 l93-Stockton\Work Plan\Sripplemental Investigation Work Plan-doe <br /> I <br /> 1 <br /> i <br /> 9 <br /> h <br />