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pH at AMW-11 is not observed when the data are limited to the period of April 1998 to March <br /> 2011, indicating that pH values have stabilized in the past thirteen years. The increasing trend for <br /> field pH at AMW-19BR is not observed when the data are limited to the period of August 2008 to <br /> March 2011, indicating that pH values have stabilized in the past three years. <br /> The increasing trend for potassium at AMW-5R is not observed when the data are limited to the <br /> period of February 2004 to March 2011, indicating that concentrations for this constituent have <br /> stabilized in the past seven years. <br /> The increasing trend for sodium at AMW-5R is not observed when the data are limited to the <br /> period of February 2004 to March 2011, indicating that concentrations for this constituent have <br /> stabilized in the past seven years. <br /> The increasing trend for field specific conductance at AMW-1 is not observed when the data are <br /> limited to the period of April 1998 to March 2011, indicating that conductance has stabilized in <br /> the past thirteen years. The increasing trend for field specific conductance at AMW-5R is not <br /> observed when the data are limited to the period of January 2002 to March 2011, indicating that <br /> conductance has stabilized in the past nine years. <br /> The first quarter 2011 concentrations of sulfate at AMW-5R (105 mg/L) and AMW-10 (49.2 <br /> mg/L) are below the National Secondary Drinking Water Standard of 250 mg/L. The increasing <br /> trend for sulfate at AMW-5R is not observed when the data are limited to the period of April <br /> 1999 to March 2011, indicating that concentrations for this constituent have stabilized in the past <br /> twelve years. The increasing trend for sulfate at AMW-10 is not observed when the data are <br /> limited to the period of March 2003 to March 2011, indicating that concentrations for this <br /> constituent have stabilized in the past eight years. <br /> The first quarter 2011 concentration of TDS at AMW-5R (684 mg/L) is above the National <br /> Secondary Drinking Water Standard of 500 mg/L. The increasing trend for TDS at AMW-5R is <br /> not observed when the data are limited to the period of April 2002 to March 2011, indicating that <br /> concentrations for this constituent have stabilized in the past nine years. <br /> The increasing trend for field turbidity at AMW-5R is not observed when the data are limited to <br /> the period of February 2005 to March 2011, indicating that turbidities have stabilized in the past <br /> six years. The increasing trend for field turbidity at AMW-10 is not observed when the data are <br /> limited to the period of May 1997 to March 2011, indicating that turbidities have stabilized in the <br /> past fourteen years. <br /> The first quarter 2011 concentration of cis-1,2-dichloroethene at AMW-1 (2.1 ug/L) is below the <br /> National Primary Drinking Water Standard of 70 ug/L and within the range of concentrations <br /> observed at AMW-1 since July 2002 (0.21 to 4.8 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 October <br /> 2002 to March 2011, indicating that concentrations for this constituent have stabilized in the past <br /> nine years. <br /> cis-1,2-Dichloroethene was not detected at AMW-10 during the first quarter 2011. The <br /> increasing trend for cis-1,2-dichloroethene at AMW-10 is not observed when the data are limited <br /> to the period of December 1996 to March 2011, indicating that concentrations for this constituent <br /> have stabilized in the past fifteen years. <br /> 6 <br />