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C-81-044: M. Middleton 2/15/84 3 hereby requested. The trends may be presented in graphical form or as a text discussion with specific references to the supporting data, which should be provided. The specific discharge points that should be discussed are the No. 5 mine discharge and 7 North Angle. I[I. B. 7. Section 2.05.6(6)-1 Observed Impacts needs to be updated to include current data. A graph for the conductivity field in the Williams Fork River was updated and shows good agreement between the upstream and downstream conductivities. However, an evaluation of trends for other water quality parameters such as solids, pH or iron, is not possible, because Tables 26 and 27 present only maximums, minimums, means and standard deviations over a ten year period from 1982 to 1992. The update should include current data presented in such a way that trends can be evaluated by the Division. The current method of reporting (presenting a statistical evaluation over a ten year period) does not allow an evaluation of trends. A table of ey ar1X means, maximums and minimums is one example of an acceptable way of summarizing the data so that trends could be evaluated. Another acceptable method would be to provide a graphical presentation. III. B. 10. CEC should present updated data on conductivity, iron and pH for all wells in which these parameters are analyzed. The data should be presented in a manner that enables the Division to evaluate trends (e.g. graphs or a table showing annual means, maximums and minimums for each parameter). According to the groundwater monitoring plan, the following wells are sampled for the referenced parameters: SMN, OK, TR-4, TR-7A, 81-O1, 259, 9MN, AVF-3, AVF- 5, AVF-6, #9 BF-5. III. C. 1. Subsidence Control Plan; one reference to well 259 as depicted on Subsidence Monitoring Map 31 was made on revised page 2.05.6(6)-22. The most current Map 31 the Division has is dated October 1991. Well 259 is not identified on this map. Please, either revise the map reference to a map the well is noted on or revise Map 31 to locate well 259. Items III. B. 9 and 12 were discussed and found that this information is not available. CEC provided a letter from the Division dated September 12, 1986 confirming information regarding the Lux well.