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Sen's Slope analysis identified decreasing trends in the following inorganic parameters: arsenic at <br /> AMW-18, barium at AAM-4, bicarbonate at AMW4, calcium at AMW4 and AMW-11, <br /> chloride at AMW4 and AMW-11,magnesium at AMW-4 and AMW-11,nitrate at AMW-1, field <br /> pH at AMW-1, potassium at AMW-4, sodium at AMW-18 and AMW-19, strontium at AMW-4, <br /> AMW-10 and AMW-11, field specific conductance at AMW-11, sulfate at AMW-1, AMW-18, <br /> and AMW-19, total dissolved solids (TDS) at AMW-4 and AMW-11, and field turbidity at <br /> AMW-4. <br /> The field pH value observed at AMW-1 during the third quarter 2007 (6.78 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: cis-1,2-dichloroethene at AMW-1 and AMW-10, tetrachloroethene at AMW-19, and <br /> vinyl chloride at AMW-1. <br /> The third quarter 2007 concentration of cis-l,2-dichloroethene at AMW-1 (4.3 ug/L) is <br /> comparable to concentrations observed at that well intermittently since October 2001. The third <br /> quarter 2007 concentration of cis-l,2-dichloroethene at AMW-10 (1.4 ug/L) is comparable to <br /> concentrations observed at that well consistently since July 2001. The concentration of cis-1,2- <br /> dichloroethene at both AMW-1 and AMW-10 is below the National Primary Drinking Water <br /> Standard (70 ug/L). The third quarter 2007 concentration of tetrachloroethene at AMW-19 (3.0 <br /> ug/L) is comparable to the concentration observed during the previous three monitoring events, <br /> and is below the National Primary Drinking Water Standard (5 ug/L). The third quarter 2007 <br /> concentration of vinyl chloride at AMW-1 (1.2 ug/L)is comparable to concentrations observed at <br /> that well intermittently since October 2001, and is below the National Primary Drinking Water <br /> Standard(2 ug/L). <br /> Sen's Slope analysis identified decreasing trends in the following organic parameters: 1,2- <br /> dichloropropane at AMM-18, cis-1,2-dichloroethene at AMW-11, dichlorodifluoromethane at <br /> AMW-1, AMW4, AMW-10, and AMW-11, tetrachloroethene at AMW-11, and trichloroethene <br /> at AMW-11. <br /> 5 <br />