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The first quarter 2011 concentration of dichlorodifluoromethane at AMW-1 (2.1 ug/L) is within <br /> the range of concentrations observed at AMW-19BR since August 2008 (1.3 to 3.4 ug/L). The <br /> increasing trend for dichlorodifluoromethane at AMW-19BR is not observed when the data are <br /> limited to the period of February 2008 to March 2011, indicating that concentrations for this <br /> constituent have stabilized in the past three years. <br /> The first quarter 2011 concentration of tetrachloroethene at AMW-19 (2.9 ug/L) is below the <br /> National Primary Drinking Water Standard of 5 ug/L and is within the range of concentrations <br /> observed at AMW-19 since May 2004 (0.33 to 4.5 ug/L). The increasing trend for <br /> tetrachloroethene at AMW-19 is not observed when the data are limited to the period of February <br /> 2005 to March 2011, indicating that concentrations for this constituent have stabilized in the past <br /> six years. <br /> Trichloroethene was not detected at AMW-1 during the first quarter 2011. The increasing trend <br /> for trichloroethene at AMW-1 is not observed when the data are limited to the period of March <br /> 1996 to March 2011, indicating that concentrations for this constituent have stabilized in the past <br /> fifteen years. <br /> The first quarter 2011 concentration of trichloroethene at AMW-19 (1.2 ug/L) is below the <br /> National Primary Drinking Water Standard of 5 ug/L and is within the range of concentrations <br /> observed at AMW-19 since May 2004 (0.24 to 2.1 ug/L). The increasing trend for <br /> trichloroethene at AMW-19 is not observed when the data are limited to the period of November <br /> 2004 to March 2011, indicating that concentrations for this constituent have stabilized in the past <br /> seven years. <br /> The first quarter 2011 vinyl chloride concentration at AMW-1 (1.1 ug/L) is below the National <br /> Primary Drinking Water Standard of 2 ug/L and is within the range of concentrations observed at <br /> AMW-1 since the constituent was first detected in May 2001 (0.16 ug/L to 13 ug/L). The <br /> increasing trend for vinyl chloride at AMW-1 is not observed when the data are limited to the <br /> period of July 1995 to March 2011, indicating that concentrations for this constituent have <br /> stabilized in the past sixteen years. <br /> 7 <br />