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the data. Trend analyses,are presented in Appendix D and are summarized below. Wells
<br /> and analytes not discussed below either do not show significant trends (rising or falling)
<br /> or have too few data points to establish meaningful trends.
<br /> Well Increasing Trends Decreasing Trends
<br /> Number
<br /> AMW-1 Arsenic,Barium, 1,1-DCA, Nitrate,pH,Sodium, Sulfate,DCDFM
<br /> Chlorobenzene,cis-1,2-DCE
<br /> AMW-3 - -
<br /> AMW-4 pH Chloride,Potassium,TDS, 1,1-DCA, 1,4-DCB,
<br /> Benzene,cis-1,2-DCE,DCDFM,PCE,TCE,
<br /> trans-1,2-DCE,Vinyl Chloride
<br /> AMW-5R - Chloride
<br /> AMW-10 Sulfate Barium,Bicarbonate,Calcium,Chloride,
<br /> Hexavalent Chromium,Magnesium,Nitrate,
<br /> Potassium,Sodium, Strontium,TDS, 1,1-DCA,
<br /> DCDFM,PCE,TCE
<br /> AMW-11 pH Chloride,Hexavalent Chromium,Magnesium,
<br /> Nitrate,Potassium,TDS, 1,1-DCA,cis-1,2-DCE,
<br /> DCDFM, PCE,TCE,trans-1,2-DCE
<br /> AMW-18 Bicarbonate- Carbonate,Chloride,Hexavalent Chromium,
<br /> Potassium, 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-12-DCE—trans-1,2-Dichloroethene
<br /> 1,2-DCP—1,2-Dichloropropane PCE—Tetrachloroethene
<br /> TDS—Total Dissolved Solids TCE—Trichloroethene
<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-10, AMW-11, and AMW-19BR. The
<br /> increasing trend exhibited for cis-1,2-DCE at well AMW-1, and generally decreasing
<br /> (organic and inorganic)trends noted in all of the CAP wells, suggests that corrective
<br /> action measures have been successful in reducing facility related groundwater impacts
<br /> downgradient of the Austin Unit.
<br /> Domestic Well Monitoring
<br /> Two domestic wells(7898-A and 8106-A)were sampled on August 2, 2013. Table 3-3
<br /> summarizes the current analytical results for the domestic well samples collected. PCE
<br /> was measured above the PQL in the samples from both domestic wells and DCDFM and
<br /> TCE were measured above the PQL in the sample collected from well 8106-A.
<br /> Estimated-trace concentrations of two VOCs were also measured in the samples collected
<br /> from wells 7898-A and 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. Samples were collected
<br /> C:\2013-0021\FA_3Q13.doc 11 Geo-Logic Associates
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