ARCHIVED REPORTS_2011_17 - Laserfiche WebLink

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1.0 Surface Water' Monitoring 0 During the second quarter 2011 monitoring event, surface water monitoring was performed at the Austin Road Landfill by Del -Tech Geotechnical Support Services, Inc. (Del -Tech). Littlejohns Creek was sampled at upstream (background) 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 compounds [VOCs]) when surface water is present. The field results providedby Del -Tech and laboratory results provided by BC Laboratories, Inc. (BC Labs) for the second quarter 2011 surface water monitoring event are summarized on Table 2.1. The historical surface water data are presented in Appendix A. Times series concentration plots of historical surface water data are presented in Appendix B. During the second quarter 2011 monitoring event, there were no constituents that exceeded their respective concentration limits in downstream monitoring point ASW -2. There were no VOCs detected at the surface water points during the second quarter 2011 monitoring event. Historical data from the surface water monitoring points were evaluated for temporal trends using Mann -Kendall / Sen's Slope trend analysis. Graphs and summary table of the Mann -Kendall / Sen's Slope analyses for surface water monitoring points are presented in Appendix B. There were no constituents that exhibited a significant increasing statistical trend. Mann -Kendall / Sen's Slope analysis identified decreasing trends in the following constituents: COD at ASW -1, nitrate at ASW -1 and ASW -2, field specific conductance at ASW -1 and ASW -2, sulfate at ASW 40 - 1, TDS at ASW -1 and ASW -2, and TOC at ASW -1 and ASW -2. Site personnel reported 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 During the second quarter 2011 monitoring event, groundwater detection monitoring and corrective action monitoring were performed at the Austin Road Landfill by Del -Tech. 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 designated as detection monitoring wells. Monitoring wells AMW-1, AMW-3, AMW-4, AMW- 5R, AMW-10, AMW-11, AMW-18, AMW-19, and AMW-19BR are designated as corrective action monitoring wells. Del -Tech has reported that corrective action monitoring well AMW-3 has been abandoned. Corrective action monitoring well AMW-5R is a replacement for corrective action monitoring well W-5. Corrective action monitoring well AMW-19BR is a replacement for corrective action monitoring well AMW-19B. The analytical results from samples collected at the corrective action wells are used to evaluate improvements in groundwater quality as a result of previously implemented corrective action measures. Groundwater samples are scheduled to be analyzed quarterly for field parameters (groundwater elevation, pH, specific conductance, temperature, and turbidity) and monitoring parameters