Laserfiche WebLink
where: V=Groundwater flow velocity. <br /> K=Hydraulic conductivity of the water-bearing unit(0.04 cm/sec). <br /> i=Hydraulic gradient: i,&0.002 for the site during the current the second quarter 2009. <br /> ne=Effective porosity(ne=0.35);an estimated value. <br /> 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 second quarter 2009 are <br /> summarized in Table 3-1 and time-series plots are presented in Appendix D. As shown <br /> in Table 3-1, a trace concentration of DCDFM was measured in the sample collected <br /> from well AMW-6. In addition, PCE was measured above the PQL in the sample <br /> collected from well AMW-6; and PCE and TCE were measured above the PQL in the <br /> samples collected from wells AMW-13 and -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 second quarter 2009 monitoring period,the following <br /> analytes were found to equal or exceed a CL. The results of the statistical analyses <br /> performed by Herst &Associates are presented in Appendix D. <br /> CONSTITUENT Concentration IDMP MONITORING WELL <br /> Limit I AW-2 AMW-6 AMW-7 AMW-13 AMW-14 <br /> MONITORING PARAMETERS(MLI) <br /> Barium 0.2368 0.26 <br /> Chromium,Hexavalent 0.005 0.0055 <br /> VOLATILE ORGANIC COMPOUNDS <br /> �chloroethene 0.5 1 1 0.71 3.6 6.9 <br /> richloroethene 0.5 1 1 0.78 0.50 <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 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. <br /> D:0009 001""2Q09.doc 10 Geologic Associates <br />