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3.0 AUSTIN UNIT 3.1 WATER QUALITY MONITORING 3.1.1 Sampling and Laboratory Analyses During the fourth quarter 2011, depth-to-water measurements were recorded and the Austin Unit's DMP and CAP groundwater monitoring wells were sampled by Del-Tech on November 3 and 8, 2011. In addition, surface water stations ASW-1 and ASW-2 were sampled on November 7, 2011. Samples were collected from each sample point with sufficient liquid and submitted to BC for analysis of the parameters stipulated in RWQCB Order No. R5-2003-0049. Table 2-1 presents the monitoring schedule and summarizes the analytical methods utilized during the current monitoring period. Water quality samples were also analyzed in the field for ORP, turbidity, temperature, specific conductance, and pH and recorded on well data sheets. The groundwater monitoring wells and leachate were sampled in accordance with the sampling and analysis procedures detailed in Appendix B. The well data sheets, raw laboratory data, certificates of analyses, and chain-of-custody records related to the sampling program are included in Appendix C. Field and laboratory analyses are summarized in Tables 3-1 through 3-6. 3.1.2 QA/QC Results The QA/QC program completed for the fourth quarter 2011 water quality monitoring event at the Austin Unit included analyses of three field blanks, four trip blanks, and three laboratory method blanks. The trip, field, and equipment blanks were analyzed for VOCs by EPA Method 8260 and method blanks were analyzed for all required analyses. The results of the QA/QC program indicate that no VOCs were detected in the QA/QC blanks during the fourth quarter 2011 monitoring period. During the fourth quarter 2011 monitoring event, a duplicate sample was collected from DMP well AW-13 and labeled DUP. Duplicate groundwater results are presented along with the primary data in Table 3-1. For quantifiable concentrations (greater than the PQL),the duplicate sample analyses yielded good correlation(within 7%)with the primary sample. Review of laboratory analysis dates with required holding times indicates that all samples were submitted and analyzed within the required holding times during the fourth quarter 2011. Based on the results of the laboratory blank and duplicate analyses, it is concluded that generally acceptable QA/QC procedures were exercised and the water quality samples collected from the Austin Unit appear to be representative of water quality at the site. 3.1.3 Groundwater Elevations and Contours Prior to purging and sampling, each well was sounded for water depth using a weighted electronic sounder, and the static water level was recorded on a well data sheet (Appendix C). The groundwater elevations were calculated for each well by subtracting c:\zoii-ooso\FA_4QILdoc 8 Geo-Logic Associates