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CONSTITUENT Concentration DMP MONITORING WELL <br /> Limit AMW-2B AMW-6 AMW-7 AMW-13 AMW-14 <br /> ONITORING PARAMETERS(mg/1) <br /> Barium 1 0.2350 0.260 0.240 <br /> Chromium,Hexavalent 1 0.005 0.0054 0.0063 <br /> OLATILE ORGANIC COMPOUNDS <br /> Dichlorodifluoromethane 0.5 0.61 <br /> etmchloroethene 0.5 0.94 2.4 7.5 <br /> richlotoethene 0.5 0.64 0.66 <br /> NOTES: (a)-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 Sen's Slope trend analysis to determine if significant increasing or <br /> decreasing trends were evident in the data. Trend analyses,performed by Herst& <br /> Associates, are presented in Appendix D and summarized below. Wells and analytes not <br /> discussed below either do not show significant trends (rising or falling)or have too few <br /> data points to establish meaningful trends. <br /> Well Number Increasing Trends Decreasing Trends <br /> AMW-2 Bicarbonate,Nitrate-N, None Apparent <br /> Specific Conductance <br /> qW -6 Barium,Bicarbonate,Chloride,Nitrate-N, None Apparent <br /> Magnesium, Strontium,TDS <br /> AMW-7 Bicarbonate,Calcium,Chloride,Magnesium, None Apparent <br /> Nitrate-N, Specific Conductance,Sulfate, <br /> TDS <br /> AMW-12 None Apparent Calcium, Chloride,Magnesium, <br /> Potassium,Strontium <br /> AMW-13 Bicarbonate Nitrate-N <br /> AMW-14 Barium,Calcium,Magnesium,Potassium, None Apparent <br /> Nitrate-N,Sodium,Strontium <br /> With the exception of the barium concentration measured in well AMW-14, no <br /> constituents that exhibited a statistically significant increasing trend also exceeded their <br /> concentration limit. It should be noted; however,that the barium concentration measured <br /> in well AMW-14 is similar to the historical results measured in this well and is well <br /> below the California primary drinking water standard (1 mg/L). <br /> 3.1.5 Corrective Action Program <br /> Field and laboratory results for CAP wells for the third quarter 2009 monitoring period <br /> are summarized in Table 3-2. As shown in Table 3-2, 13 VOCs were detected in CAP <br /> wells during the current monitoring period. Well AMW-1 had the greatest number of <br /> VOCs (12), including eight measured above the PQL. <br /> D:\2009 001TFA 3Qo9.doc <br /> 10 Geologic Associates <br />