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Sen's Slope analysis identified decreasing trends in the following inorganic parameters: barium at
<br /> AMW-4, bicarbonate at AMW-4, calcium at AMW-4, AMW-10, and AMW-11, carbonate at
<br /> AMW-18, chloride at AMW-4, AMW-11, and AMW-18, magnesium at AMW-4, AMW-10, and
<br /> AMW-11, nitrate at AMW-1,AMW-10, and AMW-18, field pH at AMW-1, potassium at AMW-
<br /> 4, AMW-10, and AMW-18, sodium at AMW-4, AMW-18 and AMW-19, strontium at AMW-4,
<br /> AMW-10 and AMW-11, field specific conductance at AMW-4 and AMW-11, sulfate at AMW-1,
<br /> AMW-18, and AMW-19, TDS at AMW4 and AMW-11, and field turbidity at AMW4 and
<br /> AMW-18.
<br /> The field pH value observed at AMW-1 during the third quarter 2008 (6.55 s.u.) is comparable to
<br /> pH values observed at that well intermittently since August 1997, and is within the National
<br /> Secondary Drinking Water Standard range(6.5 -8.5 s.u.).
<br /> The following organic parameters exhibited an increasing trend according to the 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,trichloroethene at AMW-19,and vinyl chloride at AMW-1.
<br /> The third quarter 2008 concentration of 1,1-dichloroethane at AMW-1 (2.9 ug/L) is comparable
<br /> to concentrations observed at that well intermittently since April 1995. The third quarter 2008
<br /> concentration of cis-1,2-dichloroethene at AMW-1 (2.3 ug/L) is comparable to concentrations
<br /> observed at that well intermittently since October 2001, and is below the National Primary
<br /> Drinking Water Standard (70 ug/L). The third quarter 2008 concentration of cis-1,2-
<br /> dichloeothene at AMW-10 (0.80 ug/L) is comparable to concentrations observed at that well
<br /> intermittently since February 2000, and is below the National Primary Drinking Water Standard
<br /> (70 ug/L). The third quarter 2008 concentration of tetrachloroethene at AMW-19 (4.5 ug/L) is
<br /> comparable to concentrations observed at that well since November 2006, and is below the
<br /> National Primary Drinking Water Standard (5 ug/L). The third quarter 2008 concentration of
<br /> trichloroethene at AMW-19 (2 ug/L) is comparable to concentrations observed at that well since
<br /> November 2006,and is below the National Primary Drinking Water Standard(5 ug/L). The third
<br /> quarter 2008 concentration of vinyl chloride at AMW-1 (0.68 ug/L) is comparable to
<br /> concentrations observed at that well intermittently since October 2001, and is below the National
<br /> Primary Drinking Water Standard(2 ug/L).
<br /> Sen's Slope analysis identified decreasing trends in the following organic parameters: 1,1-
<br /> dichlorochloroethane at AMW-4 and AMW-10, cis-1,2-dichloroethene at AMW-11,
<br /> dichlorodifluoromethane at AMW-1, AMW-4, AMW-10, and AMW-11 , tetrachloroethene at
<br /> AMW-4 and AMW-11,trichloroethene at AMW-11, and vinyl chloride at AMW-4.
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