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-6- Field Operation We will monitor the operation of the process in order to collect the design data that is necessary for the full-scale system. We will measure the flow rate of the vent gas from the well and carbon dioxide concentration. We will also measure the flow rate of groundwater and liquid oil that is removed by the liquids pumping. From this information we can calculate the total oil removal rate. Finally, we will use the soil probes to measure the vacuum in the soil surrounding the well. This tells us how large an area is effectively treated by the process . The "radius of influence" is an important parameter for the design of the full-scale system. Reporting Results We will report the results of the mitigation efforts to the Regional Water Quality Control Board, the city of Tracy, the California Department of Health Services, the San Joaquin Local Health District , and the San Joaquin Air Pollution Control District . We will also continue to keep the residents of the Alden Park area informed by distributing newsletters . Groundwater Monitoring As part of the requirements of the Mitigation Plan, Chevron will sample the groundwater from the existing groundwater monitoring wells and analyze the samples for contaminants . The location of the existing wells are shown in Figure 6 . The groundwater moni- toring plan is summarized in a recent letter to the RWQCB ( 7 ) , and the detailed field procedures are in Appendix A. Initially, seven wells (No. 1, 2, 3, 5, 9 , 15 , and 16 ) will be sampled . This will be completed in late April 1989 . Thereafter, five of these wells will be sampled every six months . Each sam- ple will be analyzed for volatile organics and semi-volatile organics by an independent laboratory, and the results will be reported to the RWQCB. Some field work will be required to sample the wells. In order to obtain a representative sample, the well must be purged. This will be accomplished by a crew of two men in a pickup truck . They will use a gasoline-powered pump to purge water from the wells . This water will be collected in 55-gal . drums and removed from the site for proper treatment. After the wells have been adequately purged, samples of groundwater will be bailed from the well and sent to an independent laboratory for analysis . The detailed procedures for the groundwater monitoring are included in Appendix A. Appendix A is a general procedure that was originally written for Chevron ' s Richmond Refinery. It includes descriptions for wells in Zones A, B, C, and D. All the