ARCHIVED REPORTS_2012_3 - Laserfiche WebLink

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The second quarter 2012 concentration of TDS at AMW-5R (820 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 July 2001 to May 2012, indicating that concentrations for this constituent have stabilized in the past eleven years. The second quarter 2012 field turbidity value at AMW-5R (>1000 NTUs) is consistent with the range of values observed at that well since May 1995 (<0.01 to >1000 NTUs). The increasing trend for field turbidity at AMW-5R is not observed when the data are limited to the period of November 2005 to May 2012, indicating that values have stabilized in the past seven years. The second quarter 2012 field turbidity value at AMW-10(4 NTUs)is within with the range of values observed at that well since May 1995 (<0.01 to 783 NTUs). The increasing trend for field turbidity at AMW-10 is not observed when the data are limited to the period of August 1997 to May 2012, indicating that values have stabilized in the past fifteen years. The second quarter 2012 concentration of 1,1-dichloroethane at AMW-1 (1.6 ug/L) is within the range of concentrations observed at that well since September 1994 (<0.2 to 7.9 ug/L). The increasing trend for 1,1-dichloroethane at AMW-1 is not observed when the data are limited to the period of November 1999 to May 2012, indicating that concentrations have stabilized in the past thirteen years. The second quarter 2012 concentration of chlorobenzene at AMW-1 (1.8 ug/L) is within the range of concentrations observed at that well since the first detection in July 1999 (<0.5 to 2.2 ug/L), and is below the National Primary Drinking Water Standard of 100 ug/L. The increasing trend for chlorobenzene at AMW-1 is not observed when the data are limited to the period of August 2009 to May 2012, indicating that concentrations have stabilized in the past three years. The second quarter 2012 concentration of cis-l,2-dichloroethene at AMW-1 (3.8 ug/L) is within the range of concentrations observed at that well since April 1995 (<0.18 to 50 ug/L), and is below the National Primary Drinking Water Standard of 70 ug/L. The increasing trend for cis- 1,2-dichloroethene at AMW-1 is not observed when the data are limited to the period of November 2005 to May 2012, indicating that concentrations have stabilized in the past seven years. 8