|
(1,490 umbos/cm) is comparable to values observed at AMW-5 intermittently since July 1998.
<br /> The third quarter 2009 concentration of strontium at AMW-18 (1 mg/L) is comparable to
<br /> concentrations observed at that well consistently since August 2004.
<br /> The third quarter 2009 concentration of sulfate at AMW-4 (38 mg/L) is comparable to
<br /> concentrations observed at that well intermittently since March 1996, and is well below the
<br /> National Secondary Drinking Water Standard (250 mg/L). The third quarter 2009 concentration
<br /> of sulfate at AMW-5R (66 mg/L) is comparable to concentrations observed at that well (or
<br /> AMW-5) consistently since May 2000, and is well below the National Secondary Drinking Water
<br /> Standard (250 mg/L). The third quarter 2009 concentration of sulfate at AMW-10 (59 mg/L) is
<br /> comparable to concentrations observed at that well since March 1994, and is well below the
<br /> National Secondary Drinking Water Standard (250 mg/L). The third quarter 2009 concentration
<br /> of TDS at AMW-5R (790 mg/L) is comparable to concentrations observed at AMW-5R
<br /> intermittently since August 2007. The third quarter 2009 field turbidity value at AMW-5R (468
<br /> NTUs) is comparable to values observed at that well intermittently since August 2007. The third
<br /> quarter 2009 field turbidity value at AMW-10 (5 NTUs) is comparable to values observed at that
<br /> well intermittently since January 1998. The third quarter 2009 field turbidity value at AMW-19
<br /> (999 NTUs)is comparable to values observed at that well intermittently since November 2006.
<br /> 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-11, 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,
<br /> AMW-18, and AMW-19 potassium at AMW-4, AMW-10, AMW-11, and AMW-18, sodium at
<br /> AMW-4, AMW-10, AMW-18 and AMW-19, strontium at AMW-4, AMW-10 and AMW-11,
<br /> field specific conductance at AMW-4 and AMW-11,'sulfate at AMW-1, AMW-18, AMW-19,
<br /> and AMW-1913R, TDS at AMW-4 and AMW-11, field temperature at AMW-4 and AMW-11,
<br /> and field turbidity at AMW-1 and AMW-18.
<br /> The field pH value observed at AMW-1 during the third quarter 2009 (6.74 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.). The field pH value observed at AMW-
<br /> 18 during the third quarter 2009 (7.16 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 VOCs exhibited an increasing trend according to the Sen's Slope analysis: 1,1-
<br /> dichloroethane at AMW-1 and AMW-1913R, cis-1,2-dichloroethene at AMW-1, AMW-10, and
<br /> AMW-1913R, tetrachloroethene at AMW-19, trichloroethene at AMW-19 and AMW-1913R, and
<br /> vinyl chloride at AMW-1.
<br /> The third quarter 2009 concentration of 1,1-dichloroethane at AMW-1 (4.5 ug/L) is comparable
<br /> to concentrations observed at that well intermittently since August 2004. The third quarter 2009
<br /> concentration of 1,1-dichloroethane at AMW-19BR (0.67 ug/L) is comparable to concentrations
<br /> observed at that for the past three monitoring events. The third quarter 2009 concentration of cis-
<br /> 1,2-dichloroethene at AMW-1 (3.6 ug/L) is comparable to concentrations observed at that well
<br /> intermittently since October 2001, and is well below the National Primary Drinking Water
<br /> Standard (70 ug/L). The third quarter 2009 concentration of cis-1,2-dichloroethene at AMW-10
<br /> (1.2 ug/L) is comparable to concentrations observed at that well intermittently since July 2001,
<br /> and is well below the National Primary Drinking Water Standard (70 ug/L). The third quarter
<br /> 2009 cocnentration of cis-1,2-dichloroethene at AMW-19BR (1.1 ug/L) is comparable to
<br /> 5
<br />
|