ARCHIVED REPORTS_2006_3 - Laserfiche WebLink

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AMW-11, nitrate at AMW-1, field pH at AMW-1 and AMW-3, strontium at AMW-4, sulfate at AMW-1, total dissolved solids (TDS) at AMW-11, and turbidity at AMW-4. The first quarter 2006 field pH value at AMW-1 (6.8) is comparable to pH values observed at that well since March 2003. The first quarter 2006 field pH value at AMW-3 (7.2) is comparable to pH values observed at that well since August 2003. The first quarter 2006 field pH values at AMW-1 and AMW-3 are within the National Secondary Drinking Water Standard range(6.5-8.5). The following organic parameters exhibited an increasing trend according to the Sen's Slope analysis: 1,2-dichloroethane at AMW-1, cis-l,2-dichloroethene at AMW-1 and AMW-10, trichloroethene at AMW-10, and vinyl chloride at AMW-1. The first quarter 2006 concentration of 1,2-dichloroethane at AMW-1 (0.74 ug/L) is the lowest 1,2-dichloroethane detection observed at that well since August 2003, and is well below the National Primary Drinking Water Standard (5 ug/L). The first quarter 2006 concentration of cis- 1,2-dichloroethene at AMW-1 (1.2 ug/L) is comparable to concentrations observed intermittently at that well since October 2001. The first quarter 2006 concentration of cis-l,2-dichloroethene at AMW-10 (4.6 ug/L) is comparable to concentrations observed at that well since August 2004. The concentration of cis-1,2-dichloroethene at both AMW-1 and AMW-10 is well below the National Primary Drinking Water Standard (70 ug/L). The first quarter 2006 concentration of trichloroethene at AMW-10 (9.1 ug/L) is the lowest concentration observed at AMW-10 since February 2004. The first quarter 2006 concentration of vinyl chloride at AMW-1 (1.4 ug/L) is comparable to concentrations observed at that well intermittently since October 2001, and is below the National Primary Drinking Water Standard(2 ug/L). Sen's Slope analysis identified decreasing trends in the following organic parameters: cis-1,2- dichloroethene at AMW-11, dichlorodifluoromethane at AMW-1 and AMW-11, tetrachloroethene at AMW-11,and trichlorofluoromethane at AMW-10 and AMW-11. 5