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i~.. <br />Bill Lyle I <br />,' May 5, 2000 li <br />Page 2 <br />t locations where the concentration of a given constituent might increase for a period of time. For <br />example, the Shewhart-CUSUM control charts for monitoring well M-22 show an lincrease in the <br />' concentrations of sulfate, TDS, and calcium, which is probably due to the change inl the upgradient <br />groundwater flow direction. The increase in concentration is probably associated with the dynamic <br />' status of the groundwater system rather than being related to a compromise in the effectiveness of <br />the TR-026 water management program. Thus, any given performance monitoring constituent that <br />records an "out-of-control" condition on the CUSUM-Shewhart charts does not, byitself, reflect a <br />condition or trend requiring a response under TR-026, and must be considered in th~ context of the <br />modified hydrologic and geochemical status of the overall backfill and alluvi~l groundwater <br />system. <br />1 <br /> <br /> <br />1 <br />1 <br />1 <br /> <br /> <br /> <br /> <br />' 3801 Automation Way, Suite 100, Fort Collins, Colorado 80.i2J <br />t Telephone (970) 223-9600 /FAX (970) 223-717/ <br />