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The first quarter 2012 field turbidity value at AMW-10 (6 NTUs) is within with the range of <br /> values observed at that well since May 1995 (<0.01 to 783 NTUs). The increasing trend for field <br /> turbidity at AMW-10 is not observed when the data are limited to the period of August 1997 to <br /> February 2012, indicating that values have stabilized in the past fifteen years. <br /> The first quarter 2011 concentration of 1,1-dichloroethane at AMW-1 (2.2 ug/L) is within the <br /> range of concentrations observed at that well since September 1994 (<0.2 to 7.9 ug/L). The <br /> increasing trend for 1,1-dichloroethane at AMW-I is not observed when the data are limited to <br /> the period of November 1999 to February 2012, indicating that concentrations have stabilized in <br /> the past thirteen years. <br /> The first quarter 2012 concentration of chlorobenzene at AMW-1 (2 ug/L) is within the range of <br /> concentrations observed at that well since the first detection in July 1999 (<0.5 to 2.2 ug/L), and <br /> is below the National Primary Drinking Water Standard of 100 ug/L. The increasing trend for <br /> chlorobenzene at AMW-I is not observed when the data are limited to the period of August 2009 <br /> to February 2012, indicating that concentrations have stabilized in the past three years. <br /> The first quarter 2012 concentration of cis-1,2-dichloroethene at AMW-1 (4.3 ug/L) is within the <br /> range of concentrations observed at that well since April 1995 (<O.18 to 50 ug/L), and is below <br /> the National Primary Drinking Water Standard of 70 ug/L. The increasing trend for cis-1,2- <br /> dichloroethene at AMW-1 is not observed when the data are limited to the period of May 2005 to <br /> February 2012, indicating that concentrations have stabilized in the past seven years. <br /> 8 <br />