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monitoring wells, and trends in the groundwater quality at these wells are not indicative of an <br />impact from the facility. <br />Table 2.2 presents the single VOC detection at background and detection monitoring wells during <br />the first quarter 2007 monitoring event. Trichlorofluoromethane was detected in detection <br />monitoring well MW -9A at a concentration of 1.3 ug/L. Trichlorofluoromethane at MW -9A does <br />not exhibit an increasing trend according to Sen's Slope analysis. <br />2.3 Results for Evaluation Monitoring Wells <br />Groundwater samples were collected during the first quarter 2007 monitoring event from <br />evaluation monitoring well MW -2. ATC Associates hic. reported that evaluation monitoring well <br />MW -IA was obstructed and could not be sampled during the first quarter 2007. The field and <br />laboratory results from the first quarter 2007 sampling event are summarized on Table 2.3. The <br />historical groundwater data for the evaluation monitoring wells are presented in Appendix F. The <br />field and monitoring parameter data are presented on time series concentration plots in Appendix <br />G. <br />Historical data from the evaluation monitoring wells were evaluated for temporal trend using <br />Sen's Slope trend analysis. Graphs of the Sen's Slope analyses are included in Appendix G. <br />There were no constituents that exhibited an increasing trend according to Sen's Slope analysis. <br />Sen's Slope analysis identified decreasing trends in chloride at MW -IA and MW -2, and <br />temperature at MW -IA. <br />U <br />There were no VOC detections at evaluation monitoring well MW -2 during the first quarter 2007 <br />monitoring event. 0 <br />3 <br />