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3 <br />difference of 1,031.28 pmhos/cm. The baseline mean value for conductivity is <br />33,213 pmhos/cm computed from 15 baseline samples. The operational mean <br />value determined from 71 samples is 36,209 pmhos/cm. The maximum value for <br />conductivity observed in the baseline program was 38,000 pmhos/cm. The value <br />of conductivity at lower aquifer B Groove well 21-31B has exceeded the calculated <br />NPL a total of four times during the period of record. These points are <br />summarized below and graphically represented in the chart on the previous <br />page: . <br /> <br />Date of Sample Well 21-3B <br /> <br />Conductivity (pmhos/cm) <br />August 18, 2004 44,900 <br />March 17, 2005 43,000 <br />March 11, 2009 46,800 <br />November 18, 2009 43,000 <br />No other constituents flagged above the NPL or EW I at well 21-313 or any of the <br />other monitoring wells during the current monitoring period. Monitoring of <br />conductivity at well 21-313 will continue on a quarterly frequency.