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Well Increasing Trends Decreasing Trends
<br /> Number
<br /> AMW-11 pH Chloride,Hexavalent Chromium,Magnesium,
<br /> Nitrate,Potassium,Strontium,TDS, 1,1-DCA,
<br /> cis-1,2-DCE,DCDFM,PCE,trans-1,2-DCE,TCE
<br /> AMW-18 Bicarbonate Chloride,Hexavalent Chromium,Potassium,
<br /> Sodium,Sulfate,TDS
<br /> AMW-19 Barium,Chloride Hexavalent Chromium,Nitrate,Sulfate
<br /> AMW-19BR Barium,Calcium,Chloride,pH Hexavalent Chromium,Nitrate,Sulfate, l,l-DCA,
<br /> cis-1,2-DCE
<br /> Notes: 1,4-DCB—1,4-Dichlorobenzene trans-1,2-DCE—trans-1,2-Dichloroethene
<br /> PCE—Tetrachloroethene TDS—Total Dissolved Solids
<br /> TCE—Trichloroethene 1,1-DCA—1,1-Dichloroethane
<br /> cis-1,2-DCE—cis-1,2-Dichloroethene DCDFM-Dichlorodifluoromethane
<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 one or
<br /> more VOCs in CAP wells AMW-1, AMW-4, W-10,AMW-11, and AMW-19BR.
<br /> The decreasing(organic and inorganic)trends noted in all of the CAP wells, suggests that
<br /> corrective action measures have been successful in reducing facility related groundwater
<br /> impacts downgradient of the Austin Unit.
<br /> Evaluation Monitoring Program Well Monitoring
<br /> Field and laboratory results for offsite EMP wells for the fourth quarter 2013 monitoring
<br /> ® period are summarized in Table 3-2B. As shown in Table 3-2B, 12 VOCs were detected
<br /> in the offsite EMP wells during the monitoring period. Wells AMW-1313,AMW-18B,
<br /> AMW-215,AMW-21,AMW-29,AMW-31S, and AMW-31 had two or move VOCs
<br /> measured above their PQLs; and well AMW-21S had the greatest number of VOCs 10
<br /> with five measured above their PQLs.
<br /> Domestic Well Monitoring
<br /> Two domestic wells (7898-A and 8106-A)were sampled on November 19, 2013. Table
<br /> 3-3 summarizes the current analytical results for the domestic well samples collected.
<br /> PCE was measured above the PQL in the samples from both domestic wells and DCDFM
<br /> and TCE were also measured above the PQL in the sample collected from well 8106-A.
<br /> Estimated-trace concentrations of two VOCs were also measured in the sample collected
<br /> from well 8106-A.
<br /> Surface Water Monitoring
<br /> Site run-on and run-off control facilities are designed to effectively channel surface water
<br /> to site stormwater/sedimentation ponds. According to the Operations Manager, there
<br /> were no discharges to surface water during the reporting quarter. Surface water
<br /> monitoring stations ASW-1 (upstream) and ASW-2 (downstream) were reported dry
<br /> during the fourth quarter 2013 monitoring period.
<br /> Q\2013-0021\FA_4Q13.dm 11 Geo-Logic Associates
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