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at that well intermittently since May 2007, and is within the National Secondary Drinking Water <br /> Standard range(6.5 -8.5 s.u.). <br /> The following organic parameters exhibited an increasing trend according to the Sen's Slope <br /> analysis: 1,1-dichloroethane at AMW-1, cis-1,2-dichloroethene at AMW-1 and AMW-10, <br /> tetrachloroethene at AMW-19,trichloroethene at AMW-19,and vinyl chloride at AMW-1. <br /> The first quarter 2009 concentration of 1,1-dichloroethane at AMW-1 (2.6 ug/L)is comparable to <br /> concentrations observed at that well intermittently since September 1994. The first quarter 2009 <br /> concentration of cis-1,2-dichloroethene at AMW-1 (1.6 ug/L) is comparable to concentrations <br /> observed at that well intermittently since October 2001, and is below the National Primary <br /> Drinking Water Standard (70 ug/L). The first quarter 2009 concentration of cis-1,2- <br /> dichloroethene at AMW-10 (1.4 ug/L) is comparable to concentrations observed at that well <br /> intermittently since July 2001, and is below the National Primary Drinking Water Standard (70 <br /> ug/L). <br /> The first quarter 2009 concentration of tetrachloroethene at AMW-19 (2.9 ug/L) is comparable to <br /> concentrations observed at that well since November 2006, and is below the National Primary <br /> Drinking Water Standard (5 ug/L). The first quarter 2009 concentration of trichloroethene at <br /> AMW-19 (1.3 ug/L) is comparable to concentrations observed at that well since November 2006, <br /> and is below the National Primary Drinking Water Standard (5 ug/L). The first quarter 2009 <br /> concentration of vinyl chloride at AMW-1 (0.24 ug/L) is comparable to concentrations observed <br /> at that well intermittently since October 2001, and is below the National Primary Drinking Water <br /> Standard(2 ug/L). <br /> Sen's Slope analysis identified decreasing trends in the following organic parameters: 1,1- <br /> dichlorochloroethane at AMW-4 and AMW-10, 1,4-dichlorobenzene at AMW-4, chloroform at <br /> AMW-11, cis-1,2-dichloroethene at AMW-4 and AMW-11, dichlorodifluoromethane at AMW-1, <br /> AMW-4, AMW-10, AMW-11, tetrachloroethene at AMW4, AMW-5R, and AMW-11, <br /> trichloroethene at AMW-11,and vinyl chloride at AMW4. <br /> 5 <br />