ARCHIVED REPORTS_2011_17 - Laserfiche WebLink

Home Browse Search

data are limited to the period of January 2002 to May 2011, indicating that concentrations have stabilized in the past nine years. The second quarter 2011 concentration of TDS at AMW-5R (690 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 2011, indicating that concentrations for this constituent have stabilized in the past ten years. The second quarter 2011 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 May 2005 to May 2011, indicating that values have stabilized in the past six years. The second quarter 2011 field turbidity value at AMW-10 (80 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 2011, indicating that values have stabilized in the past fourteen years. The second quarter 2011 concentration of 1,1-dichloroethane at AMW-1 (1.4 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 January 1998 to May 2011, indicating that concentrations have stabilized in the past thirteen years. The second quarter 2011 concentration of chlorobenzene at AMW-1 (2.2 ug/L) is higher than the concentrations previously observed at that well, but 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 May 1995 to May 2011, indicating that concentrations have stabilized in the past sixteen years. The second quarter 2011 concentration of cis-1,2-dichloroethene at AMW-1 (3.4 ug/L) is within the range of concentrations observed at that well since April 1995 (<O.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 October 2002 to May 2011, indicating that concentrations have stabilized in the past nine years. The second quarter 2011 concentration of cis-1,2-dichloroethene at AMW-10 (0.8 ug/L) is within the range of concentrations observed at that well since April 1995 (<0.09 to 31 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-10 is not observed when the data are limited to the period of September 1996 to May 2011, indicating that concentrations have stabilized in the past fifteen years. The second quarter 2011 concentration of dichlorodifluoromethane at AMW-19BR (2.7 ug/L) is within the range of concentrations observed at that well since November 2007 (0.13 to 3.4 ug/L). The increasing trend for dichlorodifluoromethane at AMW-19BR is not observed when the data are limited to the period of May 2008 to May 2011, indicating that concentrations have stabilized in the past three years. The second quarter 2011 concentration of tetrachloroethene at AMW-19 (2.3 ug/L) is within the range of concentrations observed at that well since May 2004 (0.33 to 4.5 ug/L), and is below the