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introduced within 20 feet of the present groundwAer table. However, CVRWQCB has <br /> required that groundwater be monitored to determine whether the bacteria migrate to <br /> groundwater. Bacteria are most likely to reach groundwater in the vicinity of MW-4, which <br /> is screened to a depth of 60 feet and presently contains water. If bacteria reach groundwater <br /> in MW-4, migration would then be radial away from this well. Therefore, a progressive <br /> monitoring program involving additional wells and laboratory analyses has been devised to <br /> monitor the migration and activity of the bacteria. This program is summarized in the <br /> decision tree shown on Figure 1. Groundwater monitoring will occur on Mondays and <br /> Thursdays of each week until the completion of the pilot test. <br /> Monitoring program A will begin Monday, February 7. Wells MW-4 and MW-14 will be <br /> screened and sampled. If inoculated bacteria or large bacterial populations are detected, <br /> laboratory measurements of dissolved oxygen and carbon dioxide will be compared to field <br /> readings to determine the accuracy of field measurements. If a correlation between field and <br /> laboratory data can be shown, the frequency of laboratory sample collection will be reduced <br /> during later events, as shown in the chart. If bacteria are detected, other nearby wells (MW- <br /> 5 and EW-1) will be added to the monitoring program. During the last weeks of the pilot <br /> test, MW-8 may also be added to the program, if bacteria are detected in EW-1. <br /> If you have any questions or comments, please contact our office. <br /> Sincerely, <br /> GEOLOGICAL AUDIT SERVICES, INC. <br /> —12f <br /> Bob Marty <br /> Project Manager <br /> U a,,,, <br /> Victor B. Cherven, R.G. #3475 <br /> Senior Geologist <br /> 3 <br />