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probe GP-11. In December, BAS Construction completed the tasks outlined in the LFG remediation plan which has been submitted to the CEHD and Cal Recycle to reduce landfill gas near GP-11, and as a result,methane concentrations were below 5 percent in perimeter soil-pore gas probes during the December 2010 LEA inspection. 3.0 AUSTIN UNIT 3.1 WATER QUALITY MONITORING 3.1.1 Sampling and Laboratory Analyses During the fourth quarter 2010, depth-to-water measurements were recorded and the Austin Unit's DMP and CAP groundwater monitoring wells were sampled by Del-Tech between November 15 and 18, 2010. In addition, surface water stations ASW-1 was sampled on November 17, 2010, while surface water station ASW-2 was reported dry. Samples were collected from each sample point with sufficient liquid and submitted to Test America 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 2010 water quality monitoring event at the Austin Unit included analyses of two field blanks, one trip blank, and six 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 methylene chloride was detected at a trace concentration in the field blank collected on November 15, 2010. However, review of the primary sample results indicates that methylene chloride was not detected in any of the primary samples collected on November 15, 2010. During the fourth quarter 2010 monitoring event, a duplicate sample was collected from CAP well AMW-2 and labeled DUP. Duplicate groundwater results are presented along with the primary data in Table 3-1. With the exception of total dissolved solids (TDS), comparison of the values in the primary sample with the duplicate results indicates that there was good agreement (within 10%). 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 2010. Based on the results of the laboratory blank and duplicate analyses, it is concluded D:\2010_00131FA.4Q10.doc 9 Geologic Associates