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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-10, AMW-I1, and AMW-18, magnesium at AMW-4,
<br /> AMW-10, and AMW-11, nitrate at AMW-1, AMW-10, and AMW-18, field pH at AMW-1 and
<br /> AMW-18, potassium at AMW-4, AMW-10, AMW-11, and AMW-18, sodium at AMW-4,
<br /> AMW-10,AMW-18 and AMW-19, strontium at AMW-4, AMW-10 and AMW-11, field specific
<br /> conductance at AMW-4 and AMW-11, sulfate at AMW-1, AMW-18, and AMW-19, TDS at
<br /> AMW-4 and AMW-11, field temperature at AMW-4 and AMW-11, and field turbidity at AMW-
<br /> 1 and AMW-18.
<br /> The field pH value observed at AMW-1 during the second quarter 2009 (6.74 s.u.) is comparable
<br /> to 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.). The field pH value observed at AMW-
<br /> 18 during the second quarter 2009 (7.1 s.u.) is comparable to pH values observed at that well
<br /> intermittently since May 2007, and is within the National Secondary Drinking Water Standard
<br /> 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, and trichloroethene at AMW-19.
<br /> The second quarter 2009 concentration of 1,1-dichloroethane,at AMW-1 (2.5 ug/L)is comparable
<br /> to concentrations observed at that well intermittently since September 1994. The second quarter
<br /> 2009 concentration of cis-1,2-dichloroethene at AMW-1 (4.8 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 (70 ug/L). The second quarter 2009 concentration of cis-1,2-
<br /> dichloroethene at AMW-10 (1.5 ug/L) is comparable to concentrations observed at that well
<br /> intermittently since July 2001, and is below the National Primary Drinking Water Standard (70
<br /> ug/L).
<br /> The second quarter 2009 concentration of tetrachloroethene at AMW-19 (2.6 ug/L)is comparable
<br /> to concentrations observed at that well since November 2006, and is below the National Primary
<br /> Drinking Water Standard (5 ug/L). The second quarter 2009 concentration of trichloroethene at
<br /> AMW-19 (1.2 ug/L) is comparable to concentrations observed at that well since November 2006,
<br /> and is below the National Primary Drinking Water Standard(5 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, 1,4-dichlorobenzene at AMW-4, cis-1,2-
<br /> dichloroethene at AMW-4 and AMW-11, tetrachloroethene at AMW-4, AMW-5R, and AMW-
<br /> 11,trans-1,2-dichloroethene at AMW-4, and trichloroethene at AMW-4 and AMW-11.
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