ARCHIVED REPORTS_2011_12 - Laserfiche WebLink

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1.0 Surface Water Monitoring During the first 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 provided by Del-Tech and laboratory results provided by TestAmerica Laboratories, Inc. (TestAmerica) for the first 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 first quarter 2011 monitoring event, only one constituent exceeded its concentration limit in downstream monitoring point ASW-2: oil and grease. The oil and grease concentration at ASW-2 (3.6 mg/L)exceeded the concentration limit of 2.55 mg/L,but the observed concentration is a trace(estimated)value below the laboratory reporting limit(RL). There were no VOCs detected at the surface water points during the first 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-2, field specific conductance at ASW-1 and ASW-2, sulfate at ASW-1, TDS at ASW-1 and ASW-2, and TOC at ASW-1. 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 first 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 AMWA, 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 AMW-5. Corrective action monitoring well AMW-19BR is a replacement for corrective action monitoring well AMW-1913. The analytical results from samples collected at I