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potassium at MW-9B (3.9 mg/L) is comparable to concentrations observed at that well <br /> intermittently since May 2005. <br /> As presented in Table 2.2, there were two VOCs detected at groundwater monitoring wells <br /> during the first quarter 2010 monitoring event. Chloroform was detected at background well <br /> MW-6A at a concentration (0.83 ug/L) above the RL. Chloroform has previously been detected <br /> at MW-6A at concentrations ranging from 0.10 ug/L to 0.81 ug/L. Toluene was detected at <br /> background well MW-6A at a concentration (0.18 ug/L) above the laboratory method detection <br /> limit(MDL)but below the RL. Toluene has not previously been detected at MW-6A. <br />