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Ki cm 0.002 sec– ft <br /> V = —_ [(0.04—)* ]*2835 ;t� 0.648 ft/day <br /> ne sec 0.35 cm –day <br /> where: V=Groundwater flow velocity. <br /> K=Hydraulic conductivity of the water-bearing unit(0.04 cm/sec). <br /> i=Average hydraulic gradient: i t;0.002 for the site during the current(first quarter <br /> 2006)monitoring period. <br /> ne=Effective porosity(ne=0.35);an estimated value. <br /> The groundwater flow rate is calculated to be 0.648 feet/day(237 feet/year). <br /> 3.1.4 Detection Monitoring Program <br /> Field and laboratory results for the DMP wells for the first quarter 2006 are summarized <br /> in Table 3-1 and time-series plots are presented in Appendix D. As shown in Table 3-1, <br /> nine VOCs were measured in DMP wells with the greatest number of VOCs (six) <br /> measured above the PQL in well AMW-13. For the DMP wells at the Austin Unit, CLs <br /> are used for the water quality protection standards (WQPS). The CLs shown in Table 3-1 <br /> were calculated by Herst&Associates using Sanitas®, a state-approved statistical <br /> software program are presented in Appendix D. Based on a comparison of the data <br /> obtained during the first quarter 2006 monitoring period, the following analytes were <br /> found to exceed a CL. <br /> CONSTITUENT Concentration I DMP MONITORING WELL <br /> Limit I AMW-2* AMW-6 AMW-7 AMW-12 AMW-13 AMW-14 <br /> MONITORING PARAMETERS i m <br /> Barium 0.2428 0.26 0.26 <br /> Carbonate 3 8.0 <br /> H 6.51-8.332 8.4 <br /> OLATILE ORGANIC COMPOUNDS <br /> 1 1-Dichlomethane 0.13 1.1 0.66 <br /> 1 -Dichlo ane 0.16 0.22' 0.43' <br /> hloroform 0.11 0.24' <br /> is-1 -Dichloroethene 0.19 2.3 0.38' <br /> ichlonldifluoromethane 0.20 2.8 1.6 <br /> etrachloroethene 0.15 43 41 <br /> -1 -Dichloroethene 0.19 0.35' <br /> iichloroethene 0.18 15 4.3 <br /> richlorofluoromethane 0.19 1.0 0.30' <br /> NOTES: (*)-Background Well. <br /> (j)-Trace Value(between MDL and PQL). <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(GTF)began operation. The observed groundwater quality constituent trends <br /> were 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 /> D:X2003_021\ForwardAustin_w06.docW/20/2006 <br /> 11 Geologic Associates <br />