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1.0 Surface Water Monitoring
<br /> During the second quarter 2010 monitoring event, surface water monitoring was performed at the
<br /> Austin Road Landfill by Del-Tech Geotechnical Support Services, Inc. (Del-Tech). Littlejohns
<br /> Creek was sampled at upstream(background)monitoring point ASW-1. Downstream monitoring
<br /> point ASW-2 was reportedly dry. Surface water samples are scheduled to be analyzed quarterly
<br /> for field parameters (pH, specific conductance, temperature, and turbidity) and monitoring
<br /> parameters (bicarbonate, calcium, carbonate, chemical oxygen demand [COD], chloride,
<br /> magnesium, nitrate, oil and grease, potassium, sodium, sulfate, total dissolved solids [TDS],total
<br /> organic carbon [TOC], and volatile organic compounds [VOCs])when surface water is present.
<br /> The field results provided by Del-Tech and laboratory results provided by BC Laboratories, Inc.
<br /> (BC Labs) for the second quarter 2010 surface water monitoring event are summarized on Table
<br /> 2.1. The historical surface water data are presented in Appendix A. Times series concentration
<br /> plots of historical surface water data are presented in Appendix B.
<br /> Historical data from the surface water monitoring points were evaluated for temporal trends using
<br /> Mann-Kendall / Sen's Slope trend analysis. Graphs and summary table of the Mann-Kendall /
<br /> Sen's Slope analyses for surface water monitoring points are presented in Appendix B. There
<br /> were no constituents that exhibited a statistically significant upward trend. Mann-Kendall/Sen's
<br /> Slope analysis identified decreasing trends in chemical oxygen demand at ASW-1, chloride at
<br /> ASW-1, nitrate at ASW-1 and ASW-2, field specific conductance at ASW-1 and ASW-2, sulfate
<br /> at ASW-1 and ASW-2,TDS at ASW-1 and ASW-2,and TOC at ASW-1 and ASW-2.
<br /> Site personnel reported that soil cover has been placed over the waste material to prevent ponding
<br /> of stormwater and to protect surface water. In addition, down drains and a perimeter ditch direct
<br /> stormwater to a basin in the southwest corner of the site. Inspection and maintenance procedures
<br /> for these stormwater control structures are provided in the site's Stormwater Pollution Prevention
<br /> Plan,prepared by CH2M Hill and revised June 1997.
<br /> 2.0 Groundwater Monitoring
<br /> During the second quarter 2010 monitoring event, groundwater detection monitoring and
<br /> corrective action monitoring were performed at the Austin Road Landfill by Del-Tech.
<br /> Monitoring well AMW-2, which is upgradient from the landfill, is the designated background
<br /> well. Monitoring wells AMW-6, AMW-7, AMW-12, AMW-13, and AMW-14 are currently
<br /> designated as detection monitoring wells. Monitoring wells AMW-1, AMW-3, AMW-4, AMW-
<br /> 5R, AMW-10, AMW-11, AMW-18, AMW-19, and AMW-19BR are designated as corrective
<br /> action monitoring wells. Del-Tech has reported that corrective action monitoring well AMW-3
<br /> has been abandoned, and that corrective action monitoring well AMW-4 has been destroyed.
<br /> Corrective action monitoring well AMW-5R is a replacement for corrective action monitoring
<br /> well AMW-5. Corrective action monitoring well AMW-19BR is a replacement for corrective
<br /> action monitoring well AMW-19B. The analytical results from samples collected at the
<br /> corrective action wells are used to evaluate improvements in groundwater quality as a result of
<br /> previously implemented corrective action measures.
<br /> Groundwater samples are scheduled to be analyzed quarterly for field parameters (groundwater
<br /> elevation, pH, specific conductance, temperature, and turbidity) and monitoring parameters
<br /> (arsenic, barium, bicarbonate, calcium, carbonate, chloride, gasoline-range petroleum
<br /> hydrocarbons, hexavalent chromium, magnesium, nitrate, oil and grease, potassium, sodium,
<br /> strontium, sulfate,TDS, and VOCs).
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