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l <br /> C <br /> ATC <br /> - <br /> ASSOCIATES I N C . <br /> previous sampling event, but the fluctuations are slight and generally remain within the range of <br /> historical results.Based on recent groundwater quality data associated with.groundwater samples <br /> collected from the site, ATC recommends continued quarterly groundwater monitoring. Per the <br /> SJCEHD letter dated May-17, 2005, the domestic well will be sampled as part of the next <br /> quarterly groundwater sampling event and natural attenuation parameters will be monitored in <br /> samples collected from MW-1 through MW-8. <br /> If you have an uestions or comment's regarding this matter lease contact our office at 209 <br /> Y any g g _ p - � ) <br /> 579-2221. <br /> Respectfully submitted, <br /> ATC Associates Inc. <br /> . , <br /> imoi!.:` <br /> Project Geologist <br /> tet . <br /> �J Jeanne Homsey, P.E. - � <br /> CA Registered Civil Engineer No. 47410- <br /> . - 4. <br /> cc: Dr.A.R. Glover - <br /> Jim Barton, RWQCB <br /> Attachments: Table 1, Summary of Groundwater Monitoring Data <br /> Table 2, Summary of Analytical Results-Groundwater <br /> i Figure 1, Site Location_ Map <br /> Figure 2,.Site Plan <br /> Figure 3, Groundwater Gradient Map <br /> Figure 4, Benzene Isoconcentration Map <br /> _Figure 5,MTBE Isoconcentration Map <br /> Attachment-I Groundwater Well Purge and'Sample Logs <br /> Attachment_2,Laboratory Analytical Results <br /> Attachment 3,Geotracker Upload Documentation <br /> s:\Environinental\17861\reports\2gmr2005.doc 5 ATCAssociatesInc. <br />