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CONSTITUENT Concentration DMP MONITORING WELL <br /> 1Limit AMW-2B AMW-6 AMW­7 AMW-13 AMW-14 <br /> MONITORING PARAMETERS(mg/1) <br /> Barium 1 0.22 0.26 0.26 <br /> VOLATILE ORGANIC COMPOUNDS(1! <br /> Tetrachloroethene 0.5 1 4.9 4.6 <br /> Trichloroethene 0.5 1 1.1 <br /> NOTES: (B)-Background Well. <br /> DMP-Trend Analyses <br /> In order to evaluate changes in water quality in DMP wells at the Austin Unit, historical <br /> trends in groundwater were evaluated beginning in 1994 when the groundwater treatment <br /> facility began operation. The observed groundwater quality constituent trends were <br /> evaluated using Mann-Kendall/ Sen's Slope trend analyses to determine if significant <br /> increasing or decreasing trends were evident in the data. Trend analyses,performed by <br /> Herst &Associates, are presented in Appendix D and summarized below. Wells and <br /> analytes not discussed below either do not show significant trends (rising or falling) or <br /> have too few data points to establish meaningful trends. <br /> Well Number Increasing Trends Decreasing Trends <br /> AMW-2 Bicarbonate,Nitrate-N, Specific pH <br /> Conductance <br /> AMW-6 Barium,Bicarbonate,Chloride,Nitrate-N, None Apparent <br /> Magnesium,Strontium,TDS <br /> AMW-7 Bicarbonate,Calcium,Chloride, None Apparent <br /> Magnesium,Nitrate-N, Specific <br /> Conductance, Sulfate,TDS <br /> AMW-12 None Apparent Barium,Calcium,Chloride,Magnesium, <br /> Potassium,Strontium <br /> AMW-13 Bicarbonate Nitrate-N <br /> AMW-14 Barium,Calcium,Hexavalent Chromium, TCE <br /> Magnesium,Nitrate-N,Potassium, <br /> Sodium, Strontium <br /> With the exception of barium concentrations measured in well AMW-14, no constituents <br /> that exhibited a statistically significant increasing trend during the first quarter 2010 <br /> monitoring event and also exceeded their concentration limits. <br /> 3.1.5 Corrective Action Program <br /> Field and laboratory results for CAP wells for the first quarter 2010 monitoring period are <br /> summarized in Table 3-2. Data were graphed on time-series concentration plots by Herst <br /> &Associates from data collected through the first quarter 2010, and are presented in <br /> Appendix D. As shown in Table 3-2, 17 VOCs were detected in CAP wells during the <br /> current monitoring period. Well AMW-I had the greatest number of VOCs (14), <br /> including nine measured above the PQL. <br /> In order to evaluate the effectiveness of corrective action measures, particularly with the <br /> groundwater treatment facility(GTF), trend analyses were performed for CAP wells at <br /> DA20100013TAI Q I 0.doc <br /> 11 Geologic Associates <br />