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Well Increasing Trends Decreasing Trends
<br /> Number
<br /> AMW-1 Arsenic,Barium, Bicarbonate, Nitrate-N,pH, Sodium, Sulfate, 1,2-DCA,
<br /> Specific Conductance, 1,1-DCA, DCDFM
<br /> Chlorobenzene,cis-1,2-DCE
<br /> AMW-3 None A2parent None Apparent
<br /> AMW-4 Nitrate-N,pH Bicarbonate,Calcium,Chloride,Magnesium,
<br /> Potassium, Specific Conductance, Strontium,TDS,
<br /> 1,1-DCA, 1,2-DCP, 1,4-DCB,cis-1,2-DCE,
<br /> DCDFM, PCE,trans-1,2-DCE,TCE,
<br /> Vinyl Chloride
<br /> AMW-5R Bicarbonate,Chloride,Nitrate-N, PCE
<br /> pH, Potassium,Sodium,Specific
<br /> Conductance, Sulfate,TDS
<br /> AMW-10 Sulfate Barium,Bicarbonate,Calcium,Chloride,
<br /> Magnesium,Nitrate-N,Potassium, Sodium,
<br /> Specific Conductance,Strontium,TDS, 1,1-DCA,
<br /> DCDFM, PCE,TCE
<br /> AMW-11 pH Barium,Chloride,Magnesium, Potassium,
<br /> Specific Conductance,TDS, 1,1-DCA, 1,2-DCP,
<br /> cis-1,2-DCE,DCDFM, PCE,trans-1,2-DCE,TCE
<br /> AMW-18 Bicarbonate Chloride,Nitrate-N,Potassium, Sodium,Sulfate,
<br /> TDS
<br /> AMW-19 Barium Hexavalent Chromium,Nitrate-N, Sulfate
<br /> AMW-]IBR pH Hexavalent Chromium,Nitrate-N, Sodium, Sulfate
<br /> Notes: 1,4-DCB—1,4-dichlobenzene 1,2-DCP—1,2-dichloropropane
<br /> trans-1,2-DCE—trans-1,2-Dichloroethene 1,2-DCA—1,2-dichloroethane
<br /> As shown in the table above, significant increasing trends were calculated for three VOC
<br /> constituents in CAP well AMW-1, while decreasing VOC trends were noted for several
<br /> VOCs in CAP wells AMW-1, AMW-4, AMW-5R, AMW-10, and AMW-11. The
<br /> increasing trend exhibited for cis-1,2-DCE at wells AMW-1, suggests reductive
<br /> dechlorination is occurring in the vicinity of this well.
<br /> 3.1.6 Domestic Well Monitoring
<br /> Two domestic wells (7898-A and 8106-A) were sampled on May 4, 2012. Table 3-3
<br /> summarizes the current analytical results for the domestic well samples collected. In the
<br /> samples collected from wells 7898-A and 8106-A, PCE and TCE were measured above
<br /> the PQL, DCFM was also measured above the PQL in the sample collected from well
<br /> 8106-A. Estimate trace concentrations of one or more VOC were also measured in wells
<br /> 7898-A and 8106-A.
<br /> 3.1.7 Surface Water Monitoring
<br /> During the second quarter 2012 monitoring period, surface-water monitoring stations
<br /> ASW-1 and ASW-2 were sampled on May 4, 2012. Table 3-5 summarizes the current
<br /> analytical results of surface water samples collected at the Austin Unit. As shown on
<br /> Table 3-5, CLs were exceeded for calcium and sulfate at downgradient surface water
<br /> station ASW-2. However, no constituents exhibited statistically significant increasing
<br /> C:X2012-0025kFA_2QI2.doc 11 Geo-Logic Associates
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