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results for the wells. On the chain-of-custody and analysis <br />. sheets the sample that is labeled MW2 was taker. from our <br /> well MW3 and vise-versa. The sample MW4 is a duplicate of <br /> MWl as noted on the chain-of-custody. Laboratory reports <br /> and chain--of-custody forms are contained in Appendix: E. <br /> 5.0 RECOMMENDATIONS/CONCLUSIONS <br /> Due to elevated concentrations of hydrocarbon constituents, <br /> WaterWork proposes to purge and resampl+e well MW3 . We also <br /> - propose to re-monitor all wells to verify groundwater <br /> gradient at the site. <br /> When the results of purging, sampling and monitoring are <br /> complete, WaterWork will present the information to San <br /> Joaquin County Public Health Services, Environmental Health <br /> y Division. <br /> Additional investigative/remedial measures will be <br /> recommended at that time as appropriate. <br /> 6.0 REFERENCES <br /> Hotchkiss, W.R. and Balding, G.O. 1971, Geology, Hydrology, <br /> and Water Quality of the Tracy-Dos Palos Area, San Joaquin <br /> Valley, California, USGS Open--File Report, 104 pp. <br /> • San Joaquin County Flood Control and Water Conservation <br /> Distract, Fall, 1989, Semi-Annual Groundwater Report. <br /> 5 <br />