2011/01/19 Council Agenda Packet

December 21, 2010 9 HWA Project No. 98165 periods of seasonal high and low groundwater levels (January-April and July-October). This scope and budget includes ten ground water sampling rounds over the first five years. Table 1 Performance Monitoring Sampling and Reporting Schedule Ground Water Landfill Gas Year Date Sampling Report Sampling Report 1 1/2011 P P 4/2011 P 7/2011 P P 10/2011 P P P 2 1/2012 P P 4/2012 P 7/2012 P P 10/2012 P P P 3 1/2013 P P 4/2013 P 7/2013 P P 10/2013 P P P 4 1/2014 P P 4/2014 P 7/2014 P P 10/2014 P P P 5 1/2015 P P 4/2015 P 7/2015 P P 10/2015 P P P P—planned date of execution The ten ground water sampling rounds included in this scope will include sampling and analysis for selected semi-volatile organic compounds, selected metals and inorganic parameters. Samples will also be tested in the field for specific conductance,pH, dissolved oxygen and temperature. Sampling methods will be in accordance with the existing Sampling and Analysis Plan, which will be amended to include the performance monitoring wells, sampling intervals, and analytes. Contaminants of Concern The results of the Evaluation Monitoring were used to refine the list of analytes for the subsequent Performance Monitoring to those compounds that are identified as compounds of concern (COCs). Determination of the COCs is documented in the HWA Evaluation Monitoring Report Dated December 14, 2004. COCs to be monitored during Performance Monitoring include: • Metals: nickel, zinc, iron, manganese, arsenic 2010 Exhibit A 12 21 10.doc 827 HWA GEOSCIENCES INC.