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1.0 Surface Water Monitoring Surface water samples were collected by Bryan A. Stirrat & Associates during the second quarter 2006 monitoring event from Littlejohns Creek at the upstream monitoring point (ASW -1) and downstream monitoring point (ASW -2). Surface water samples are scheduled to be analyzed quarterly for field parameters (pH, specific conductance, temperature, and turbidity) and monitoring parameters (bicarbonate, calcium, carbonate, chemical oxygen demand [COD], chloride, magnesium, nitrate, oil and grease, potassium, sodium, sulfate, total dissolved solids [TDS], total organic carbon [TOC], and volatile organic carbons [VOCs]) when surface water is present. The field and laboratory results provided by BC Laboratories, Inc. for the second quarter 2006 surface water monitoring event are summarized on Table 2.1. The historical surface water data are presented in Appendix A. The data are graphed on time series concentration plots, included in Appendix B. The concentration limits were calculated by Herst & Associates, Inc. using data collected through the second quarter 2006 monitoring event. Information on the development of the concentration limits can be found in the Fourth Quarter/Annual 1999 Monitoring Report, Austin Road Landfill prepared by CH2M Hill in January 2000 and is also available in Appendix C of this report. The statistical analysis calculations for surface water monitoring points are included in Appendix B. During the second quarter 2006 monitoring event, only field specific conductance exceeded its concentration limit at downstream surface water monitoring point ASW -2. The second quarter 2006 field specific conductance value at ASW -2 (2,600 umhos/cm) is higher than values previously observed at that monitoring point. During the second quarter 2006 monitoring event, there were no volatile organic compounds (VOC) detected above the laboratory practical quantitation limit (PQL) in samples collected from surface water monitoring points. Historical data from the surface water monitoring points were evaluated for temporal trend using Sen's Slope trend analysis. Graphs of the Sen's Slope analyses for surface water monitoring points are included in Appendix B. Only field pH at ASW -2 exhibited a statistically significant upward trend for the second quarter 2006 monitoring event. Note that field pH at ASW -2 did not fall outside its concentration limit range during the second quarter 2006. The second quarter 2006 field pH value at ASW -2 (8.1) is within the federal Secondary Drinking Water Standard range (6.5-8.5). Sen's Slope analysis identified decreasing trends in total dissolved solids at ASW -1 and ASW -2, and total organic carbon at ASW -l. Site personnel indicate that soil cover has been placed over the waste material to prevent ponding of stormwater and to protect surface water. In addition, down drains and a perimeter ditch direct stormwater to a basin in the southwest corner of the site. Inspection and maintenance procedures for these stormwater control structures are provided in the site's Stormwater Pollution Prevention Plan, prepared by CH2M Hill and revised June 1997. 2.0 Groundwater Monitoring Groundwater samples were collected by Bryan A. Stirrat & Associates during the second quarter 2006 monitoring event from the detection monitoring and corrective action wells at the site. Monitoring well AMW-2, which is upgradient from the landfill, is the designated background well. Monitoring wells AMW-6, AMW-7, AMW-12, AMW-13, and AMW-14 are currently