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Ki cm 0.001 sec– ft <br /> V = — _ [(0.04 —)* ]* 2835 ,z� 0.32 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=Hydraulic gradient: i,z�0.001 for the site during the current the first quarter 2012. <br /> n,=Effective porosity(ne=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 first quarter 2012 are <br /> summarized in Table 3-1. As shown in Table 3-1, PCE was measured above the PQL in <br /> the samples collected from wells AMW-13 and AMW-14; and dichlorodifluoromethane <br /> (DCDFM), TCE, and trichlorofluoromethane (TCF )were measured above the PQL in <br /> the sample collected from well AMW-13. In addition, several VOCs were measured at <br /> trace concentrations in the samples collected from wells AMW-6, AMW-13, and AMW- <br /> 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 first quarter 2012 monitoring period,the <br /> following analytes were found to exceed a CL. <br /> CONSTITUENT Concentration I DMP MONITORING WELL <br /> Limit AMW-2 AMW-6 AMW-7 AMW-13 AMM-14 <br /> MONITORING PARAMETERS(mg/1) <br /> Barium 0.2229 0.270 0.260 <br /> Chloride 74.5 86 <br /> Chromium(hexavalent) 1 0.00496 0.0052 0.0057 <br /> VOLATILE ORGANIC COMPOUNDS <br /> Dichlorodifluoromethane 0.5 0.63 <br /> etrachloroethene 0.5 9.6 1.4 <br /> Trichloroethene 0.5 2.7 <br /> Trichlorofluoromethane 0.5 0.53 <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. 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 /> CA2012-0025TA_1Q12.doe 9 Geo-Logic Associates <br />