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period of April 1999 to August 2012, indicating that values have stabilized in the past thirteen years. The third quarter 2012 field pH value at AMW-11 (7.27 s.u.) is within the range of values observed at that well since March 1994 (6.60 to 8.40 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 W-11 is not observed when the data are limited to the period of May 2003 to August 2012, indicating that values have stabilized in the past nine years. The third quarter 2012 field pH value at AMW- 19BR (7.67 s.u.) is within the range of values observed at that well since November 2007 (6.74 to 7.90 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-19BR is not observed when the data are limited to the period of November 2008 to September 2012, indicating that values have stabilized in the past four years. The third quarter 2012 field pH value at AMW-1 (6.86 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 W-1 is not observed when the data are limited to the period of February 1997 to August 2012, indicating that values have stabilized in the past fifteen years. The third quarter 2012 concentration of potassium at AMW-5R (8.6 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 August 2012, indicating that concentrations have stabilized in the past eight years. The third quarter 2012 concentration of sodium at AMW-5R (78 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 May 2012, indicating that concentrations have stabilized in the past eight years. The third quarter 2012 field specific conductance value at AMW-1 (1,475 umhos/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 July 1998 to August 2012, indicating that values have stabilized in the past fourteen years. The third quarter 2012 field specific conductance value at AMW-5R (1,345 umhos/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 are limited to the period of July 2001 to August 2012, indicating that values have stabilized in the past eleven years. The third quarter 2012 concentration of sulfate at AMW-5R (62 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 August 2012, indicating that concentrations have stabilized in the past fourteen years. The third quarter 2012 concentration of sulfate at -10 (42 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 August 2012, indicating that concentrations have stabilized in the past eleven years. The third quarter 2012 field temperature value at AMW-5R (20.2 °C) is within the range of values observed at that well since March 1994 (15.3 to 23 °C). The increasing trend for field