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1 <br /> CA <br /> { I AS S O C I ATES I N C . <br /> V CONCLUSIONS AND RECOMMENDATIONS <br /> The laboratory analytical results of the groundwater samples.collected on January 12, 2004, are <br /> generally consistent with recent historical results. The concentrations of petroleum hydrocarbon <br /> constituents detected in the sample,collected from MW-2 generally decreased with respect.to the <br /> previous sampling event. The concentrations of petroleum hydrocarbon constituents detected in <br /> the sample v collected from MW-'3 increased with respect to the previous sampling event. <br /> Petroleum hydrocarbon constituents have not been detected in groundwater samples collected <br /> from MW-4 and MW-5 since June 1999. Petroleum_hydrocarbonconstituents have never been <br /> detected at or above the laboratory reported detection limits in samples collected from MW-1 and <br /> MW-6. The groundwater gradient direction is consistent with previous sampling events. Based <br /> on recent groundwater quality data associated.with groundwater samples collected from the site, <br /> i ATC recommends no further action. <br /> If you have any questions or comments regarding this"matter please contact our office at (209) <br /> 579-2221. <br /> Respectfully submitted, <br /> t` <br /> ATC Associates Inc. <br /> � SS] <br /> Todd:Hafner 'E <br /> Project Geologist <br /> C 4.8 :37 <br /> Jeanne Hornsey,P E.. <br /> CA Registered'Civil Engineer No.47410r <br /> cc: Dr. A.R.:Glover <br /> i Mark List,RWQCB <br /> Attachments: Table l-, Summary of Groundwater Monitoring Data <br /> 'Table 2, Summary of Analytical Results-Groundwater <br /> Figure 1,.-Site Vicinity Map <br /> Figure 2, Groundwater Gradient Map <br /> Appendix A Groundwater Well Purge and Sample Logs <br /> ' <br /> Appendix B,taboratory Analvtical Results <br /> s:\Env ironmental\1786IV-eports\1 gmr2004.doc <br /> 4 <br />