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1.12 ug/L. bis(2-Ethylhexyl)phthalate is a common laboratory contaminant often present in <br /> sampling devices and laboratory containers. Chloroform was detected at background well MW- <br /> 6A at a concentration (0.81 ug/L) above the laboratory PQL. Chloroform has previously been <br /> detected at MW-6A at concentrations ranging from 0.10 ug/L to 0.33 ug/L, but these detections <br /> were not confirmed during subsequent sampling events. Trichlorofluoromethane was detected at <br /> MW-9A at a concentration (0.61 ug/L) above the laboratory PQL. Trichlorofluoromethane has <br /> previously been detected at MW-9A at concentrations ranging from 0.14 ug/L to 5.2 ug/L. <br /> Piper diagrams of the first and third quarter 2008 results for the groundwater monitoring wells are <br /> included in Appendix F. Hydrographs of the groundwater monitoring wells, illustrating historic <br /> groundwater elevations, well screen elevations, and pump intake elevations, are included in <br /> Appendix G. <br />