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The groundwater flow rate is calculated to be 0.65 feet/day(237 feet/year). <br /> 3.1.4 Detection Monitoring Program <br /> Field and laboratory results for the DMP wells for the third quarter 2007 are summarized <br /> in Table 3-1 and time-series plots are presented in Appendix D. As shown in Table 3-1, <br /> estimated trace VOC constituent concentrations measured included, 1,2-dichloropropane <br /> (1,2-DCP) in the sample collected from well AMW-14; DCDFM in samples collected <br /> from wells AMW-6 and AMW-14; PCE in the sample collected from well AMW-12; and <br /> TCE in the samples collected from wells AMW-6 and AWM-13. In addition,PCE was <br /> measured above the PQL in samples collected from well AMW-6, AMW-13, and AMW- <br /> 14; and TCE was measured above the PQL in the sample collected from well AMW-14. <br /> 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 third quarter 2007 monitoring period, the following analytes <br /> were found to exceed a CL. The results of the statistical analyses performed by Herst& <br /> Associates are presented in Appendix D. <br /> CONSTITUENT Concentration DMP MONITORING WELL <br /> ONITORING PARAMETERS m Limit AMW-2B AMW-6 I AMW-7 AMW-12 AMW-13 AMW-14 <br /> Bafium 0.2442 0.270 <br /> arbonate 12 13 <br /> hromiurn,Hexavalent 0.005 0.0078 <br /> VOLATILE ORGANIC COMPOUNDS( ) <br /> etrachloroethene 0.5 0.67 1.7 7.6 <br /> richloroethene 0.5 0 82 <br /> NOTES: (B)-Backgound 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 analyses 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. As shown in the following table, no <br /> increasing trends were noted for VOC constituents, and none of the constituents that <br /> exhibited an increasing trend exceeded a CL. <br /> D:�2007_0043kForwardnusen sumo7.doc <br /> 10 <br /> Geologic Associates <br />