ARCHIVED REPORTS_2009_15 - Laserfiche WebLink

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and AMW-5R, strontium at AMW-18, sulfate at AMW-5R and AMW-10, TDS at AMW-5R, and field turbidity at AMW-5R, AMW-10, and AMW-19. Carbonate at AMW-5R exhibited an apparent increasing trend according to the Sen's Slope analysis, but this trend is due to a historical increase in the laboratory RL. The fourth quarter 2009 concentration of barium at AMW-1 (0.25 mg/L) is comparable to historical concentrations observed at that well, and is well below the National Primary Drinking Water Standard (2 mg/L). The fourth quarter 2009 concentration of barium at AMW-5R (0.31 mg/L) is comparable to concentrations observed at that well since August 2003, and is well below the National Primary Drinking Water Standard (2 mg/L). The fourth quarter 2009 concentration of bicarbonate at AMW-1 (570 mg/L) is comparable to historical concentrations observed at that well. The fourth quarter 2009 concentration of bicarbonate at AMW-5R (450 mg/L) is comparable to concentrations observed at that well since August 2007. The fourth quarter 2009 concentration of bicarbonate at AMW-18 (330 mg/L) is comparable to concentrations observed at that well since November 2004. The fourth quarter 2009 concentration of chloride at AMW-5R (110 mg/L) is comparable to concentrations previously observed at AMW-5, and is below the National Secondary Drinking Water Standard (250 mg/L). The fourth quarter 2009 concentration of nitrate at AMW-4 (1.7 mg/L) is comparable to historical concentrations observed at that well, and is below the National Primary Drinking Water Standard (10 mg/L). The fourth quarter 2009 concentration of nitrate at AMW- 5R (28 mg/L) is comparable to concentrations observed at that well since August 2007, and exceeds the National Primary Drinking Water Standard (10 mg/L). The fourth quarter 2009 concentration of sodium at AMW-5R (73mg/L) is comparable to concentrations observed at that well since August 2007. The fourth quarter 2009 field specific conductance value at AMW-1 (913 umhos/cm) is comparable to historical values observed at that well. The fourth quarter 2009 field specific conductance value at AMW-5R (1,370 umhos/cm) is comparable to historical values observed at that well. The fourth quarter 2009 concentration of strontium at AMW-18 (1.1 mg/L) is comparable to concentrations observed at that well since August 2004. The fourth quarter 2009 concentration of sulfate at AMW-5R (64 mg/L) is comparable to concentrations observed at that well (or AMW-5) since May 2000, and is well below the National Secondary Drinking Water Standard (250 mg/L). The fourth quarter 2009 concentration of sulfate at AMW-10 (67 mg/L) is comparable to concentrations observed at that well since May 2006, and is well below the National Secondary Drinking Water Standard (250 mg/L). The fourth quarter 2009 concentration of TDS at AMW-5R (760 mg/L) is comparable to historical concentrations observed at that well. The fourth quarter 2009 field turbidity value at AMW-5R (>999 NTUs) is comparable to historical values observed at that well. The fourth quarter 2009 field turbidity value at AMW-10 (9 NTUs) is comparable to historical values observed at that well. The fourth quarter 2009 field turbidity value at AMW-19 (979 NTUs) is comparable to historical values observed at that well. Sen's Slope analysis identified decreasing trends in the following inorganic parameters: barium at AMW-4, bicarbonate at AMW-4 and AMW-10, calcium at AMW4, AMW-10, and AMW-11, chloride at AMW4, AMW-10, AMW-11, AMW-18, AMW-19, hexavalent chromium at AMW- 19, magnesium at AMW4, AMW-10, and AMW-11, nitrate at AMW-1, AMW-10, AMW-18, and AMW-19BR, field pH at AMW-1, AMW-18, and AMW-19, potassium at AMW-4, AMW- 10, and AMW-11, sodium at AMW4, AMW-10, AMW-18, and AMW-19, strontium at AMW-4 and AMW-10, field specific conductance at AMW-4 and AMW-11, sulfate at AMW-1, AMW- 4