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Ki cm 0.001 sec– ft <br /> V = —= [(0.04—)* ]* 2835 - 0.32 ftlday <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=Hydraulic gradient: i;t;0.001 for the site during the current the second quarter 2012. <br /> ne=Effective porosity(n,=0.35);an estimated value. <br /> The groundwater flow rate is calculated to be 0.32 feet/day (118 feet/year). <br /> 3.1.4 Detection Monitoring Program <br /> Field and laboratory results for the Austin Unit DMP wells for the second quarter 2012 <br /> are summarized in Table 3-1. As shown in Table 3-1, PCE was measured above the PQL <br /> in the samples collected from wells AMW-13 and AMW-14; and trichloroethene (TCE) <br /> and dichlorodifluoromethane (DCDFM)were measured above the PQL in the sample <br /> collected from well AMW-13. In addition, one or more VOCs were measured at trace <br /> concentrations in the samples collected from wells AMW-6, AMW-13, and 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; the results of the statistical <br /> analyses performed by Herst& Associates are presented in Appendix D. Based on a <br /> comparison of the data obtained during the second quarter 2012 monitoring period,the <br /> following analytes were found to exceed a CL. <br /> CONSTITUENT Concentration DMP MONITORING WELL <br /> Limit AMW-2 ANIW-6 AMW-7 AMW-13 I AMW-14 <br /> ONITORING PARAMETERS(m /I <br /> Barium 1 0.225 1 0.280 T 0.280 <br /> Chloride 1 74.36 1 1 95 <br /> OLATILE ORGANIC COMPOUNDS( /l) <br /> ichlorodifluoromethane 0.5 1 0.51 <br /> etrachloroethene 0.5 1 8.5 1.2 <br /> [Trichloroethene 0.5 1 2.2 <br /> NOTES: (e)-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. For constituents whose historical data consists primarily of non- <br /> detects (carbonate alkalinity, oil and grease, volatile petroleum hydrocarbons, and <br /> VOCs), trend evaluations were performed on data from the earliest detection through the <br /> present. The observed groundwater quality constituent trends were evaluated using <br /> Mann-Kendall/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 /> C:\2012-0025\FA_2Ql2.doc 9 Geo-Logic Associates <br />