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C
<br />Well
<br />Increasing Trends
<br />Decreasing Trends
<br />Number
<br />AMW-1
<br />Barium, Bicarbonate, Specific
<br />Chloride, Nitrate -N, pH, Sulfate, 1,2 -DCB,
<br />Conductance, 1,1 -DCA,
<br />1,3 -DCB, DCDFM
<br />cis-1,2-DCE, Chlorobenzene,
<br />Vinyl Chloride
<br />AMW-3
<br />None Apparent
<br />None Apparent
<br />AMW-4
<br />Nitrate -N, pH
<br />Barium, Bicarbonate, Calcium, Chloride, GRO,
<br />Magnesium, Potassium, Specific Conductance,
<br />Strontium, TDS, 1,1 -DCA, 1,4 -DCB, Benzene,
<br />cis-1,2-DCE, DCDFM, PCE, TCE, trans-1,2-DCE
<br />AMW-5/5R
<br />Bicarbonate, Chloride, Nitrate -N,
<br />PCE
<br />pH, Potassium, Sodium, Specific
<br />Conductance, Sulfate, TDS
<br />AMW-10
<br />Sulfate, cis-1,2-DCE
<br />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
<br />pH
<br />Barium, Bicarbonate, Calcium, Chloride,
<br />Magnesium, Potassium, Specific Conductance,
<br />TDS, 1,1 -DCA, cis-1,2-DCE, DCDFM, PCE, TCE
<br />AMW-18
<br />Bicarbonate
<br />Chloride, Carbonate, Nitrate -N, Potassium,
<br />Sodium, Sulfate, TDS
<br />AMW-19
<br />Barium, PCE, TCE
<br />Hexavalent Chromium, Nitrate -N, Sodium, Sulfate
<br />AMW-19BR
<br />pH,DCDFM
<br />Nitrate -N, Potassium, Sodium, Sulfate
<br />Notes: 1,4 -dichlorobenzene= 1,4 -DCB 1,2 -dichlorobenzene= 1,2-DC13
<br />1,3 -dichlorobenzene = 1,3 -DCB trans-1,2-dichloroethene = trans-1,2-DCE
<br />As shown in the table above, significant increasing trends were calculated for one or
<br />more VOC constituents in CAP wells AMW-1, AMW-10, AMW-19, and AMW-19BR,
<br />while one or more decreasing VOC trends were noted in CAP wells AMW-1, AMW-4,
<br />AMW-5/5R, AMW-10, and AMW-11. The increasing trend exhibited for cis-1,2-DCE at
<br />wells AMW-1 and AMW-10, suggests reductive dechlorination is occurring in the
<br />vicinity of these wells.
<br />3.1.6 Domestic Well Monitoring
<br />Two domestic wells (7898-A and 8106-A) were sampled on August 18, 2011. Table 3-3
<br />summarizes the current analytical results for the domestic well samples collected. In the
<br />sample collected from well 7898-A, carbon disulfide, DCDFM, and TCE were measured
<br />at trace concentrations, and PCE was measured above the PQL. In the sample collected
<br />from well 8106-A, 1,1 -DCA and cis-1,2-DCE were measured at trace concentrations, and
<br />DCDFM, PCE, and TCE were measured above their PQLs. None of the measured VOC
<br />concentrations exceeded a state primary drinking water standard.
<br />3.1.7 Surface Water Monitoring
<br />During the third quarter 2011 monitoring period, surface -water monitoring stations
<br />ASW -1 and ASW -2 were sampled on August 18, 2011. Table 3-5 summarizes the
<br />current analytical results of surface water samples collected at the Austin Unit. As shown
<br />CA2011-0050\FA3Q11.docx 11 Geo -Logic Associates
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