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0 umhos/cm) is the highest value observed at that well since March 1994. The second quarter 2006 <br /> field specific conductance value at AMW-5 (770 umhos/cm) is the lowest value observed at that <br /> well since March 2001. The third quarter 2006 field specific conductance value at AMW-10(750 <br /> umhos/cm) is comparable to or lower than values observed at that well consistently since <br /> February 2004. The specific conductance value at AMW-5 during the second quarter 2006 is <br /> below the value observed at background well AMW-2 during the third quarter 2006 (840 <br /> umhos/cm). <br /> The third quarter 2006 concentration of strontium at AMW-19 (0.75 mg/L) is comparable to <br /> concentrations observed at that well since February 2005. The second quarter 2006 concentration <br /> of sulfate at AMW-5 (74 mg/L) is comparable to concentrations observed at that well <br /> intermittently since July 2001, and is well below the National Secondary Drinking Water <br /> Standard (250 mg/L). The third quarter 2006 concentration of sulfate at AMW-10 (18 mg/L) is <br /> the lowest concentration observed at that well since August 1991. The second quarter 2006 <br /> sulfate concentration at AMW-5 and third quarter 2006 concentration at AMW-10 are below the <br /> third quarter 2006 concentration observed in background well AMW-2 (82 mg/L). The second <br /> quarter 2006 concentration of total dissolved solids (TDS) at AMW-5 (710 mg/L) is comparable <br /> to concentrations observed at that well since July 2001. The third quarter 2006 concentration of <br /> total dissolved solids (TDS) at AMW-19 (530) is comparable to concentrations observed at that <br /> well since May 2005. The total dissolved solids concentrations at AMW-5 during the second <br /> quarter 2006 and at AMW-19 during the third quarter 2006 are below the concentration observed <br /> in background well AMW-2 during the third quarter 2006(770 mg/L). <br /> Sen's Slope analysis identified decreasing trends in the following inorganic parameters: arsenic at <br /> AMW-3 and AMW-19, barium at AMW-3 and AMW-4, calcium at AMW-4 and AMW-11, <br /> chloride at AMW-1, AMW-4, and AMW-11, magnesium at AMW-4 and AMW-11, nitrate at <br /> AMW-1, field pH at AMW-1 and AMW-3, potassium at AMW-4, strontium at AMW-4, sulfate <br /> at -1, field temperature at AMW-11, total dissolved solids (TDS) at AMW-11, and field <br /> turbidity at -4. The third quarter 2006 field pH value at AMW-1 (7.2) is the highest value <br /> observed at that well since February 2001. The third quarter 2006 field pH value at AMW-3 (7.2) <br /> comparable to values observed at that well since August 2003. The third quarter 2006 field pH <br /> values at -1 and AMW-3 are both within the National Secondary Drinking Water Standard <br /> range(6.5-8.5). <br /> The following organic parameters exhibited an increasing trend according to the Sen's Slope <br /> analysis: cis-1,2-dichloroethene at AMW-1 and AMW-10,trichloroethene at AMW-10, and vinyl <br /> chloride at AMW-1. <br /> The third quarter 2006 concentration of cis-l,2-dichloroethene at AMW-1 (0.86 ug/L) is <br /> comparable to concentrations observed at that well intermittently since October 2001. The third. <br /> quarter 2006 concentration of cis-l,2-dichloroethene at AMW-10 (31 ug/L) is higher than <br /> concentrations previously observed at that well. `The concentration of cis-l,2-dichloroethene at <br /> both -1 and AMW-10 is below the National Primary Drinking Water Standard (70 ug/L). <br /> The third quarter 2006 concentration of trichloroethene at AMW-10 (0.46 ug/L) is the lowest <br /> concentration observed at AMW-10 since September 1996, and is below the National Primary <br /> Drinking Water Standard (5 ug/L). The third quarter 2006 concentration of vinyl chloride at <br /> AMW-1 (0.45 ug/L) is comparable to concentrations observed at that well intermittently since <br /> October 2001, and is below the National Primary Drinking Water Standard(2 ug/L.). <br /> 5 <br />