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For the DMP wells at the Austin Unit, CLs are calculated for the water quality protection <br /> standards (WQPS). The CLs shown in Table 3-1 were calculated by Herst&Associates <br /> using Sanitas, a state-approved statistical software program. Based on a comparison of <br /> the data obtained during the second quarter 2010 monitoring period, the following <br /> analytes were found to exceed a CL. The results of the statistical analyses performed by <br /> Herst& Associates are presented in Appendix D. <br /> CONSTITUENT Concentration DMP MONITORING WELL <br /> Limit AMW-2B AMW-6 AMW-7 AMW-13 I AMW-14 <br /> ONITORING PARAMETERS m <br /> Barium 1 0.2189 0.27 0.25 <br /> OLATILE ORGANIC COMPOUNDS <br /> etrachloroethene 1 0.5 0.76 4.6 3.2 <br /> richloroethene 1 0.5 1.0 <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 Arsenic,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 second quarter 2010 <br /> monitoring event and also exceeded their concentration limits. <br /> DA2010_0013u'A_2Q1 o.doc <br /> 10 Geologic Associates <br />