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Well Increasing Trends Decreasing Trends
<br /> Number
<br /> AMW-1 Specific Conductance,Arsenic,Barium, Nitrate,pH, Sulfate, 1,2-DCA
<br /> 1,1-DCA, 1,2-DCB,cis-1,2-DCE,
<br /> Chlorobenzene
<br /> AMW-4 pH Calcium,Chloride, Magnesium,
<br /> Potassium, Specific Conductance,
<br /> Strontium,TDS
<br /> AMW-5R Bicarbonate,Chloride,Nitrate, None Apparent
<br /> Potassium,pH,Specific Conductance,
<br /> Sodium,Sulfate,TDS
<br /> AMW-10 Sulfate Specific Conductance,Barium,
<br /> Bicarbonate,Calcium,Chloride,
<br /> Magnesium,Nitrate,Potassium, Sodium,
<br /> Strontium,TDS,cis-1,2-DCE,PCE,TCE
<br /> AMW-11 pH Barium,Chloride,Magnesium,Potassium,
<br /> Specific Conductance,TDS
<br /> AMW-18 Bicarbonate Chloride,Potassium,Sodium, Sulfate,
<br /> TDS
<br /> AMW-19 Barium Hexavalent Chromium,Nitrate, Sulfate
<br /> AMW-19BR Chloride,pH Hexavalent Chromium,Nitrate, Sulfate,
<br /> 1,1-DCA,cis-1,2-DCE
<br /> Notes: 1,2-DCB-1,2-dichlobenzene cis-1,2-DCE-cis-1,2-dichloroethene TCE-Trichloroethene
<br /> PCE-Tetrachloroethene 1,1-DCA-1,l-dichloroethane 1,2-DCA-1,2-Dichloroethane
<br /> As shown in the table above, significant increasing trends were calculated for four VOC
<br /> constituents in CAP well AMW-1, while decreasing VOC trends were noted for one or
<br /> more VOC constituents 1n CAP wells AMW-1, AMW-10, and AMW-19BR. The
<br /> increasing trend exhibited for cis-1,2-DCE at well AMW-1 suggests reductive
<br /> dechlorination is occurring in the vicinity of this well.
<br /> Domestic Well Monitoring
<br /> The domestic wells (7898-A and 8106-A) were inadvertently not sampled during the
<br /> fourth quarter 2012 monitoring period.
<br /> Surface Water Monitoring
<br /> During the fourth quarter 2012 monitoring period, surface-water monitoring stations
<br /> ASW-1 and ASW-2 were sampled on December 19, 2012. Table 3-5 summarizes the
<br /> current analytical results of surface water samples collected at the Austin Unit. As shown
<br /> on Table 3-5, no CLs were exceeded and no VOCs were detected in the surface water
<br /> samples collected during the monitoring period.
<br /> Leachate Monitoring
<br /> According to the Operations Manager, no leachate was taken off site during the fourth
<br /> quarter 2012. The leachate collection system, which collects leachate from the north face
<br /> of the landfill, has been operational since November 1996. WQPS (concentration limits)
<br /> CA2012-00MFA 4Q12.doe 2 Geo-Logic Associates
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