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Well Number Increasing Trends Decreasing Trends <br /> AMW-2 Bicarbonate,Nitrate-N,Specific Conductance Arsenic <br /> AMW-6 Barium,Bicarbonate,Chloride,Nitrate-N, None Apparent <br /> Strontium <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 /> Sodium,Strontium <br /> There were no constituents that exhibited a statistically significant increasing trend <br /> during the second quarter 2009 monitoring event and also exceeded their concentration <br /> limits. <br /> 3.1.5 Corrective Action Program <br /> Field and laboratory results for CAP wells for the second quarter 2009 monitoring period <br /> are summarized in Table 3-2. Data were graphed on time-series concentration plots by- <br /> Herst& Associates from data collected through the second quarter 2009, and are <br /> presented in Appendix D. As shown in Table 3-2, 13 VOCs were detected in CAP wells <br /> during the current monitoring period. Well -1 had the greatest number of VOCs <br /> (12), including eight 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 /> the Austin Unit,beginning in 1994 when the GTF began operation. The observed <br /> groundwater quality constituent trends were evaluated using Sen's Slope trend analyses <br /> to determine if significant increasing or decreasing trends were evident in the data. Trend <br /> analyses,performed by Herst&Associates, are presented in Appendix D and are <br /> summarized below. Wells and analytes not discussed below either do not show <br /> significant trends (rising or falling)or have too few data points to establish meaningful <br /> trends. As shown in the following table, significant increasing trends were calculated for <br /> one or more VOC constituents in CAP wells -1,AMW-10, and AMW-19,while <br /> decreasing VOC trends were noted in CAP wells AMW-4,AMW-5/5R,AMW-10, and <br /> AMW-11. <br /> D:12009_0017kFA 2Q09.doc <br /> 11 Geologic Associates <br />