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. <br />li? <br />Mr. Travis Marshall <br />October 28, 2010 <br />Page 2 <br />ENV046.10 <br />Copies of the final EPA plugging and abandonment report and the BLM Sundry Notice are <br />also enclosed. <br />Subsidence is monitored at twenty bench mark survey locations established in a grid <br />across the 0 - 5 year panel of the well field. These locations are surveyed annually. The <br />data from the initial baseline survey is plotted with the 2010 survey data for each point in <br />the chart below. The marker elevations for the baseline period compared with 2010 data <br />indicate no significant changes. <br />Well Field Subsidence Benchmarks <br />6560 -- - <br />6480 <br />m 6400 <br />6320 <br />0 <br />6240 <br />w 6160 <br />6080 <br />6000 . <br />1 2 3 4 5 6 7 8 9 1011 121314151617181920 <br />Surveyed Monitoring Locations <br />-•- Baseline 2010 <br />Herbicide application for noxious weed control along the well field road and pads was <br />completed during the quarter. No other activity regarding the production wells or the well <br />field occurred during the report period. <br />Should you have any questions or comments regarding this information, please contact me <br />at (970) 285-0428 or Celina Akin at (970) 285-0406. <br />Sincerely, <br />Todd Wilson <br />Plant Manager <br />TW/cma