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Well Increasing Trends Decreasing Trends
<br /> Number
<br /> AMW-1 Barium,Bicarbonate,Specific Nitrate-N,pH,Sulfate
<br /> Conductance, 1 1-DCA,cis-1,2-DCE
<br /> AMW-3 None A2parent None Apparent
<br /> AMW-4 Nitrate-N,Sulfate Barium,Bicarbonate,Calcium,Chloride,
<br /> Magnesium,Potassium,Sodium,Strontium,
<br /> Specific Conductance,TDS, 1,1-DCA,
<br /> 1,4-Dichlorobenzene,cis-1,2-DCE,PCE,
<br /> TCE,trans-1,2-dichloroethene
<br /> AMW-5/5R Barium,Bicarbonate,Chloride, PCE
<br /> Nitrate-N,pH,Sodium,Specific
<br /> Conductance,Sodium,Sulfate,TDS
<br /> AMW-10 Sulfate,cis-1,2-DCE Calcium,Chloride,Magnesium,Nitrate-N,
<br /> Potassium,Sodium,Strontium, 1,1-DCA
<br /> AMW-11 None Apparent Calcium,Chloride,Magnesium,Potassium,
<br /> Strontium, Specific Conductance TDS,
<br /> cis-1,2-DCE,PCE,TCE
<br /> AMW-18 Bicarbonate,Strontium Carbonate,Chloride,Nitrate-N,pH,
<br /> Potassium,Sulfate,Sodium
<br /> AMW-19 PCE,TCE Sodium,Sulfate
<br /> The increasing trend exhibited by cis-1,2-DCE suggests reductive dechlorination is
<br /> occurring in the vicinity of wells AMW-1 and AW-10.
<br /> 3.1.6 Domestic Well Monitoring
<br /> Two domestic wells (7898-A and 8106-A)were sampled on May 4,2009. Table 3-3
<br /> summarizes the current analytical results for the domestic well samples collected. As
<br /> shown on Table 3-3,two trace-level VOCs(1,1-DCA and cis-1,2-DCE)were detected in
<br /> the sample collected from domestic well 8106-A; and three VOCs(DCDFM,PCE, and
<br /> TCE)were measured above the PQL in the samples collected from both domestic wells
<br /> 7898-A and 8106-A.
<br /> 3.1.7 Surface Water Monitoring
<br /> Surface-water sampling was conducted at surface-water monitoring stations ASW-1 and
<br /> ASW-2 on May 4, 2009. Table 3-4 summarizes the current analytical results for surface
<br /> water samples collected at the Austin Unit and compares the results with the WQPS
<br /> (concentration limits). During the second quarter 2009 monitoring event, CLs were
<br /> exceeded as a result of the detection of carbon disulfide above its PQL at upgradient
<br /> surface water station ASW-1 and the detection of carbon disulfide and chloromethane
<br /> above their PQLs at downgradient surface water station SW-2. It should be note,
<br /> however,that chloromethane and carbon disulfide are common field/laboratory
<br /> contaminants. A comparison of upgradient(ASW-1) and downgradient(ASW-2) surface
<br /> water samples indicates generally similar inorganic constituent concentrations,
<br /> suggesting that landfill operations are not impacting surface water quality.
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<br /> 12 Geologic Associates
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