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2010 field turbidity value at AMW-10 (3 NTUs) is comparable to values observed at that well
<br /> since February 2009.
<br /> Mann-Kendall / Sen's Slope analysis identified decreasing trends in the following inorganic
<br /> parameters: barium at AMW-4 and AMW-10, bicarbonate at AMW-4, AMW-10, and AMW-11,
<br /> calcium at AMW-4, AMW-10 and AMW-11, chloride at AMW-4, AMW-10, AMW-11, and
<br /> AMW-18, hexavalent chromium at AMW-19, magnesium at AMW-4, AMW-10, and AMW-11,
<br /> nitrate at AMW-1, AMW-10, AMW-18, AMW-19, and AMW-19BR, field pH at AMW-1,
<br /> potassium at AMW-4, AMW-10, AMW-11, AMW-18, and AMW-19BR, sodium at AMW-4,
<br /> AMW-10, AMW-18, and AMW-19, field specific conductance at AMW-4 and AMW-11,
<br /> strontium at AMW-4 and AMW-10, sulfate at AMW-1, AMW-18, AMW-19, and AMW-19BR,
<br /> field temperature at AMW-4 and AMW-11, TDS at AMW-4, AMW-10, AMW-11, AMW-18,
<br /> and AMW-19, and field turbidity at AMW-1 and AMW-18. Carbonate at AMW-18 exhibited an
<br /> apparent decreasing trend according to the Mann-Kendall/ Sen's Slope analysis, but this trend is
<br /> due to a historical decrease in the laboratory RL.
<br /> The field pH value observed at AMW-1 during the third quarter 2010 (6.73 s.u.) is comparable to
<br /> historical pH values observed at that well, and is within the National Secondary Drinking Water
<br /> Standard range(6.5 - 8.5 s.u.).
<br /> The following VOCs exhibited an increasing trend according to the Mann-Kendall / Sen's Slope
<br /> analysis: 1,1-dichloroethane at AMW-1, cis-1,2-dichloroethene at AMW-1 and AMW-10,
<br /> tetrachloroethene at AMW-19, and trichloroethene at AMW-19.
<br /> The third quarter 2010 concentration of 1,1-dichloroethane at AMW-1 (2.4 ug/L) is comparable
<br /> to historical concentrations observed at that well. The third quarter 2010 concentration of cis-1,2-
<br /> dichloroethene at AMW-1 (3.0 ug/L) is comparable to historical concentrations observed at that
<br /> well, and is well below the National Primary Drinking Water Standard (70 ug/L). cis-1,2-
<br /> Dichloroethene was not detected(<1.0 ug/L)at AMW-10 during the third quarter 2010.
<br /> The third quarter 2010 concentration of tetrachloroethene at AMW-19 (2.7 ug/L)is comparable to
<br /> historical concentrations observed at that well, and is below the National Primary Drinking Water
<br /> Standard (5 ug/L). The third quarter 2010 concentration of trichloroethene at AMW-19 (1.3
<br /> ug/L) is comparable to historical concentrations observed at that well, and is below the National
<br /> Primary Drinking Water Standard(5 ug/L).
<br /> Mann-Kendall / Sen's Slope analysis identified decreasing trends in the following VOCs: 1,1-
<br /> dichlorochloroethane at AMW-10 and AMW-11, cis-l,2-dichloroethene at AMW-4 and AMW-
<br /> 11, dichlorofluoromethane at AMW-1, AMW-10, and AMW-11, tetrachloroethene at AMW-4,
<br /> AMW-10, and AMW-11, and trichloroethene at AMW-4, AMW-10 and AMW-11. The
<br /> following organic constituents exhibited an apparent decreasing trend according to the Mann-
<br /> Kendall/ Sen's Slope analysis, but this trend is due to a historical decrease in the laboratory RL:
<br /> 1,1-dichloroethane at AMW-4, 1,4-dichlorobenzene at AMW-4, benzene at AMW-1 and AMW-
<br /> 4, dichlorofluoromethane at AMW-4, tetrachloroethene at AMW-5R, trichloroethene at AMW-
<br /> 5R.
<br /> 5
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