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0 by Del -Tech between August 18 and 31, 2011. Domestic wells 7898-A and 8106-A and surface water stations ASW -1 and ASW -2 were sampled on August 18, 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 dissolved oxygen, 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. The QA/QC program completed for the third quarter 2011 water quality monitoring event at the Austin Unit included analyses of one field blank, one trip blank, three laboratory method blanks, and one duplicate sample. The trip and field 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 any of the QA/QC blanks during the monitoring period. During the third quarter 2011 monitoring event, a duplicate sample was collected from well AMW-14 and labeled DUP. As shown on Table 3-1, for quantifiable concentrations (greater than the PQL), the duplicate sample analyses yielded good correlation (within 10%) with the primary sample. Review of laboratory analysis dates with the required holding times indicates all of the samples were submitted and analyzed within the required holding times during the third quarter 2011. Based on the QA/QC results, it is concluded that the laboratory data generated for the third quarter 2011 monitoring period are generally acceptable 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 Q. The groundwater elevations were calculated for each well by subtracting the depth -to -water measurement from the top -of -casing reference elevation. The current and historical groundwater elevation data for the Austin Unit are summarized in Table 3-4. The groundwater elevation data obtained during this quarterly monitoring period were used to generate the groundwater elevation contour map shown on Figure 3-1, which indicates that groundwater beneath the Austin Unit generally flows to the north-northeast with an average hydraulic gradient of 0.001 ft/ft. c:UOI1-ooso\FA_sQII.a«X 8 Geo -Logic Associates