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The fourth quarter 2012 field pH value at AMW-1 (6.71 s.u.) is within the range of values observed at that well since June 1994 (6.24 to 7.60 s.u.), and is within the National Secondary Drinking Water Standard range of 6.5 to 8.5 s.u. The decreasing trend for field pH at AMW-I is not observed when the data are limited to the period of July 1999 to November 2012, indicating that values have stabilized in the past thirteen years. The fourth quarter 2012 concentration of potassium at AMW-5R (7.3 mg/L) is within the range of concentrations observed at that well since August 2003 (6.4 to 8.6 mg/L). The increasing trend for potassium 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 concentration of sodium at AMW-5R (66 mg/L) is within the range of concentrations observed at that well since August 2003 (42 to 82 mg/L). The increasing trend for potassium 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 specific conductance value at AMW-1 (1,384 umbos/cm) is within the range of values observed at that well since June 1994 (492 to 2,180 umhos/cm). The increasing trend for field specific conductance at AMW-1 is not observed when the data are limited to the period of January 1999 to November 2012, indicating that values have stabilized in the past thirteen years. The fourth quarter 2012 field specific conductance value at AMW-5R (1,148 umbos/cm) is within the range of values observed at that well since March 1994 (280 to 1,490 umhos/cm). The increasing trend for field specific conductance at AMW-5R is not observed when the data - limited to the period of It to November 2012, stabilizedvalues have past eleven years. I The fourth quarter 2012 concentration of sulfate at AMW-5R (67 mg/L) is within the range of concentrations observed at that well since March 1994 (<1 to 105 mg/L), and is below the National Secondary Drinking Water Standard of 250 mg/L. The increasing trend for sulfate at AMW-5R is not observed when the data are limited to the period of October 1998 to November 2012, indicating that concentrations have stabilized in the past fourteen years. The fourth quarter 2012 concentration of sulfate at AMW-10 (44 mg/L) is within the range of concentrations observed at that well since March 1994 (18 to 80 mg/L), and is below the National Secondary Drinking Water Standard of 250 mg/L. The increasing trend for sulfate at AMW-10 is not observed when the data are limited to the period of May 2001 to November 2012, indicating that concentrations have stabilized in the past eleven years. The fourth quarter 2012 field temperature value at AMW-5R (18 °C) is within the range of values observed at that well since March 1994 (15.3 to 23 °C). The increasing trend for field temperature at AMW-5R is not observed when the data are limited to the period of May 2000 to November 2012, indicating that values have stabilized in the past twelve years. The fourth quarter 2012 concentration of TDS at AMW-5R (760 mg/L) is within the range of concentrations observed at that well since March 1994 (213 to 880 mg/L), but is above the National Secondary Drinking Water Standard of 500 mg/L. However, the increasing trend for TDS at AMW-5R is not observed when the data are limited to the period of January 2002 to November 2012, indicating that concentrations for this constituent have stabilized in the past ten years.