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1.0 Surface Water Monitoring 0
<br />During the fourth quarter 2009 monitoring event, the background (upstream) monitoring point
<br />ASW -1 and downstream monitoring point ASW -2 at Littlejohns Creek were reportedly dry.
<br />The historical surface water data are presented in Appendix A. Times series concentration plots
<br />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 />Sen's Slope trend analysis. Graphs and summary table of the Sen's Slope analyses for surface
<br />water monitoring points are presented in Appendix B. There were no constituents that exhibited
<br />a statistically significant upward trend. Sen's Slope analysis identified decreasing trends in
<br />chemical oxygen demand at ASW -1, nitrate at ASW -2, field specific conductance at ASW -1,
<br />TDS at ASW -1 and ASW -2, and TOC at ASW -1.
<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 fourth quarter 2009 monitoring event, groundwater detection monitoring and
<br />corrective action monitoring were performed at the Austin Road Landfill by ATC Associates, Inc.
<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. ATC Associates, Inc. has reported that corrective action monitoring
<br />well AMW-3 has been abandoned. Corrective action monitoring well AMW-5R is a replacement
<br />for corrective action monitoring well AMW-5. Corrective action monitoring well AMW-19BR is
<br />a replacement for corrective action monitoring well AMW-1913. The analytical results from
<br />samples collected at the corrective action wells are used to evaluate improvements in
<br />groundwater quality as a result of 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).
<br />2.1 Detection Monitoring
<br />During the fourth quarter 2009 monitoring event, ATC Associates, Inc. collected groundwater
<br />samples from the background well (AMW-2) and detection monitoring wells (AMW-6, AMW-7,
<br />AMW-12, AMW-13, and AMW-14). The field results provided by ATC Associates, Inc. and
<br />laboratory results provided by BC Laboratories, Inc. for the fourth quarter 2009 groundwater
<br />detection monitoring event are summarized on Table 2.2. The historical groundwater data for the
<br />detection monitoring wells are presented in Appendix D. Times series concentration plots of
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