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CEC Response <br />As discussed, CEC will submit this information under separate letter in the interest <br />of completing the issuance of the permit renewal. This will allow CEC to assess <br />the requested information and provide a summation of any observed trends, <br />without delaying the renewal any further. <br />DMG Concern <br />III.B.7. Section 2.05.6(6)-1 Observed Impacts needs to be updated to <br />include current data. A graph for the conductivity field in the Williams <br />Fork River was updated and shows good agreement between the <br />upstream and downstream conductivities. However, an evaluation <br />of trends for other water quality parameters such as solids, pH or <br />iron, is not possible, because Table 26 and 27 present only <br />maximums, minimums, means and standard deviations over a ten <br />year period from 1982 to 1992. <br />The update should include current data presented in such a way that <br />trends can be evaluated by the Division. The current method of <br />reporting (presenting a statistical evaluation over a ten year period) <br />does not allow an evaluation of trends. A table of yearly means, <br />maximums and minimums is one example of an acceptable way of <br />summarizing the data so that trends could be evaluated. Another <br />acceptable method would be to provide a graphical presentation. <br />CEC Response <br />As discussed, CEC feels that the requested yearly min, max, mean information has <br />already been provided to the Division in the form of the AHR, wherein can be <br />found the pertinent information for each year specific to that AHR. CEC will <br />provide the requested information under separate letter as discussed with both <br />yourself and Ms. Pavlik. At this time, CEC is not determined the most effective <br />manner of conveying the requested information, but this item will be addressed <br />within the previously discussed 90 day timeframe. Please contact us should you <br />have further questions on this matter. <br />