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TABLE 1-2: ENHANCED GROUNDWATER MONITORING PROGRAM RESULTS <br /> Sampling Date Sampling Point Result <br /> September 24, 2016 Upper Monitoring Well Dry (No Sample Obtained) <br /> Lower Monitoring Well Dry (No Sample Obtained) <br /> October 28, 2016 Upper Monitoring Well 1.5 "Water; Resampled - Dry <br /> Lower Monitoring Well Dry (No Sample Obtained) <br /> November 21, 2016 Upper Monitoring Well Dry (No Sample Obtained) <br /> Lower Monitoring Well Dry (No Sample Obtained) <br /> Virtually all sampling episodes to date have encountered "dry" monitoring wells, with the sole <br /> exception being the October 28, 2016 sampling of the upper monitoring well (situated upgradient <br /> of the EPF and the potentially impacted liner area). Subsequent sampling of that well two days <br /> later suggests that an anomalous condition may have been encountered, as the October 30 <br /> sampling effort again determined "dry hole" conditions. <br /> With respect to the lower(or down gradient) monitoring well, all sampling events have consistently <br /> encountered "dry hole" conditions. Thus, the monitoring data (or general lack thereof) suggests <br /> that it is unlikely that the composite liner system has been compromised; or, if so, that it is <br /> functioning as per the original multi-component design objectives, thereby precluding significant <br /> downward migration (if any)through and beneath the liner system. <br /> The full extent of adverse impact(if any) on liner system integrity can best be determined through <br /> the execution of the proposed removal action and subsequent liner system inspection and/or <br /> testing. <br /> VRI anticipates continuation of the enhanced groundwater monitoring program (i.e., the monthly <br /> sampling frequency) until such time that the removal action is completed and the EPF obtains the <br /> requisite recertification. At that time, by separate Technical Revision, VRI anticipates requesting <br /> DRMS approval to modify the groundwater sampling program, reverting back to the original <br /> frequency of once per quarter. <br /> 9 <br />