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;. ~~ <br />June 11, 1992 <br />Page 4 <br />MLRD Concern <br />Surface Water <br />1) After reviewing the 1989 Annual Hydrology Report and associated questions raised by the <br />Division, it is apparent that there is some conflicting information concerning flow and increased <br />salt content in Foidel Creek. Therefore, the following is an attempt to clarify the Division's <br />concerns on this matter. <br />It is understood that the year-round flow in Foidel Creek since 1985 is due to upstream mining <br />activities. This is stated by CYCC in the text of the 1990 Annual Hydrology Report. It is not <br />true that conductivity is showing an increase at Site 700 as stated in the October 8, 1990 <br />response to the Division's 1989 Annual Hydrology Report questions. It is appazent from Figure <br />29 that Site USGS 900 and Site 29 show a very similar trend in conductivity, while Site 700 <br />shows no change in conductivity over time. <br />It is also highly unlikely that "regional climatic changes" (1989 Annual Hydrologic Report <br />response) would impact Foidel Creek drainage with no impact present in any data from Middle <br />Creek sites. It does seem apparent, though, that Mine No. 3 is having little, if any, hydrologic <br />impact, based on the information to date. However, the upstream mining activities referred to <br />in this report will certainly be closely examined as to the emerging trend concerning increased <br />TDS and dissolved solids on Foidel Creek. <br />CYCC Response <br />CYCC does not agree with the Division's assessment that there is no change in conductivity over <br />time at Site 700. There is in fact an increasing trend, albeit a slight one, appazent in both the <br />data set and Figure 29. While this trend may not be highly significant, it does in fact exist even <br />though it is not of the magnitude seen in Foidel Creek. CYCC does in fact concur with the <br />Division's assessment that no hydrologic impacts from the Mire 3 operation aze apparent. <br />Should you have any questions or comments, please contact me at your convenience. <br />Sincerely, <br />„~ <br />Mare Mid l~ <br />Environmental Specialist <br />