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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. As shown on the table <br /> below, the following analytes were found to equal or exceed a CL during the fourth <br /> quarter 2009 monitoring period. The results of the statistical analyses performed by <br /> Herst &Associates are presented in Appendix D. <br /> I CONSTITUENT Concentration DMP MONITORING WELL <br /> 1 V-6 1 AMW-7 I AMW-121 AMW-13 I AMW-14 <br /> MONITORING PARAMETERS(m 1) <br /> Badurn 1 0.242 0.260 0.250 <br /> Chromium,Hexavalent 1 0.00539 0.0055 1 0.0057 1 1 <br /> Volatile Petroleum Hydrocarbons 1 0.025 1 1 0.180 1 <br /> VOLATILE ORGANIC COMPOUNDS(pgA) <br /> Dichlorodifluoromethane 0.5 0.68 <br /> Tetrachloroethene 0.5 4.2 8.0 <br /> Trichloroethene 0.5 1.1 0.63 <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 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 /> AMW-6 Barium,Bicarbonate,Chloride,Nitrate-N, None Apparent <br /> 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,Nitrate-N, None Apparent <br /> Potassium, 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 (0.250 mg/L)is similar to the historical results measured in this well <br /> and is well below the California primary drinking water standard (I mg/L). <br /> D:\2009_0017\FA_4Q09.doc <br /> 10 GeoLogic Associates <br />