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Greeley 35th Ave Pit — Groundwater /ModFlow Results, Preliminary Adequacy Review <br />Page 2 <br />September 11, 2014 <br />the influence of these ponds, the Division believes more attention should be paid to these <br />zero - gradient boundaries. Please address the assumption to ignore or inadequately model <br />these zero - gradient boundaries /model cells. <br />Specific Comment <br />3. Paragraph 1.3 and Figure 5 — It appears to the Division that the predicted drawdown <br />contours were erroneously obtained. Perhaps by subtracting the present surface <br />conditions from the predicted slurry wall conditions, rather than vice versa. The results <br />on Figure 5 and the text referencing these results in paragraph 1.3 indicate mounding <br />downgradient of the slurry wall and shadowing upgradient of the slurry wall. Of course <br />this does not make intuitive sense. Please correct your model results and text summary, <br />or explain this unexpected result. <br />If either you or the applicants have any questions regarding the comments above, please call me <br />at (303) 866 -3567, extension 8169. <br />