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concentration of barium at AMW-19 (0.21 mg/L) is below the National Primary Drinking Water Standard of 2 mg/L. The increasing trend for dissolved barium at AMW-19 is not observed when the data are limited to the period of May 2004 to November 2012, indicating that concentrations have stabilized in the past eight years. The fourth quarter 2012 concentration of bicarbonate alkalinity at AMW-5R (410 mg/L) is within the range of concentrations observed at that well since March 1994 (148 to 550 mg/L). The increasing trend for bicarbonate at AMW-5R is not observed when the data are limited to the period of April 1995 to November 2012, indicating that concentrations have stabilized in the past seventeen years. The fourth quarter 2012 concentration of bicarbonate alkalinity at AMW-18 (370 mg/L) is within the range of concentrations observed at that well since March 2004 (28 to 370 mg/L). The increasing trend for bicarbonate at AMW-18 is not observed when the data are limited to the period of May 2006 to November 2012, indicating that concentrations have stabilized in the past six years. The fourth quarter 2012 concentration of chloride at AMW-5R (91 mg/L) is within the range of concentrations observed at that well since March 1994 (1.24 to 130 mg/L), and is below the National Secondary Drinking Water Standard of 250 mg/L. The increasing trend for chloride at AMW-5R is not observed when the data are limited to the period of May 2000 to November 2012, indicating that concentrations have stabilized in the past twelve years. The fourth quarter 2012 concentration of chloride at AMW-19BR (88 mg/L) is higher than the range of concentrations observed at that well since November 2007 (38 to 69 mg/L), but is below the National Secondary Drinking Water Standard of 250 mg/L. The increasing trend for chloride at AMW-19BR is not observed when the data are limited to the period of November 2010 to November 2012, indicating that concentrations have stabilized in the past two years The fourth quarter 2012 concentration of nitrate at AMW-5R (17 mg/L) is within the range of concentrations observed at that well since March 1994 (<0.012 to 32 mg/L), but is above the National Primary Drinking Water Standard of 10 mg/L. However, the increasing trend for nitrate at AMW-5R is not observed when the data are limited to the period of February 2004 to November 2012, indicating that concentrations have stabilized in the past eight years. The fourth quarter 2012 field pH value at AMW-4 (6.47 s.u.) is within the range of values observed at that well since March 1996 (6.05 to 8.41 s.u.), and is the lowest pH value observed at that well since November 2004. The increasing trend for field pH at AMW-4 is not observed when the data are limited to the period of February 2004 to November 2012, indicating that values have stabilized in the past eight years. The fourth quarter 2012 field pH value at AMW- 5R (6.84 s.u.) is within the range of values observed at that well since March 1994 (6.00 to 7.72 s.u.), and is within the National Secondary Drinking Water Standard range of 6.5 to 8.5 s.u. The increasing trend for field pH at AMW-5R is not observed when the data are limited to the period of April 1999 to November 2012, indicating that values have stabilized in the past thirteen years. The fourth quarter 2012 field pH value at AMW-11 (6.88 s.u.) is within the range of values observed at that well since March 1994 (6.60 to 8.40 s.u.), and is the lowest pH values observed at that well since November 2007. It is also within the National Secondary Drinking Water Standard range of 6.5 to 8.5 s.u. The increasing trend for field pH at AMW-11 is not observed when the data are limited to the period of May 2003 to November 2012, indicating that values have stabilized in the past nine years. The fourth quarter 2012 field pH value at AMW-19BR (6.71 s.u.) is the lowest pH value observed at that well, and is within the National Secondary Drinking Water Standard range of 6.5 to 8.5 s.u. The increasing trend for field pH at AMW- 19BR is not observed when the data are limited to the period of November 2008 to November 2012, indicating that values have stabilized in the past four years.