ARCHIVED REPORTS_2011_17 - Laserfiche WebLink

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not observed when the data are limited to the period of November 2003 to May 2011, indicating that values have stabilized in the past eight years. The second quarter 2011 field pH value at AMW-5R (7.69 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 October 1998 to May 2011, indicating that values have stabilized in the past thirteen years. The second quarter 2011 field pH value at AMW-11 (7.58 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 AMW-11 is not observed when the data are limited to the period of July 1998 to May 2011, indicating that values have stabilized in the past thirteen years. The second quarter 2011 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 May 2011, indicating that values have stabilized in the past three years. The second quarter 2011 field pH value at AMW-1 (6.72 s.u.) is within the range of values observed at that well since November 2007 (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-1 is not observed when the data are limited to the period of September 1996 to May 2011, indicating that values have stabilized in the past fifteen years. The second quarter 2011 concentration of potassium at AMW-5R (7.7 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 November 2003 to May 2011, indicating that concentrations have stabilized in the past eight years. The second quarter 2011 concentration of sodium at AMW-5R (63 mg/L) is within the range of concentrations observed at that well since August 2003 (42 to 82 mg/L). The increasing trend for sodium at AMW-5R is not observed when the data are limited to the period of February 2004 to May 2011, indicating that concentrations have stabilized in the past seven years. The second quarter 2011 field specific conductance value at AMW-1 (1,467 umhos/cm) is within the range of values observed at that well since June 1994 (719 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 May 2011, indicating that values have stabilized in the past thirteen years. The second quarter 2011 field specific conductance value at AMW-5R (1,000 umbos/cm) is within the range of values observed at that well since March 1994 (280 to 1,490 umbos/cm). The increasing trend for field specific conductance at AMW-5R is not observed when the data are limited to the period of October 2001 to May 2011, indicating that values have stabilized in the past ten years. The second quarter 2011 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 January 1999 to May 2011, indicating that concentrations have stabilized in the past twelve years. The second quarter 2011 concentration of sulfate at AMW-10 (27 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