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July 8, 1992 Page 6 in turn affected the pH and possibly the conductivity to a minor degree. Relevant data is contained in the 1990 AHR Data Listings Volumes. MLRD Concern Alluvial Wells Fish Creek As mentioned in the Eckman Park AHR review, there is some evidence of overall better quality higher in the drainage. Well 008-AW-3 appears to be influenced by the outflow of Tipple Pond E; however, a general downward trend in field conductivity is noted (Figure 23}. TCC Response No response necessary. MLRD Concern Foidel Creek The underground mine discharge and Pond D discharge appear to contribute to the marked change in field conductivity noted in the Foidel Creek alluvial wells (Figure 22- in July of 1986. It is also apparent thet the conductivity of the mine discharge itself changed significantly at that time. The field conductivity appears to be relatively stable at its current level and no undesirable level of heavy metals is noted. Please offer your comments related to the conductivity changes noted at the Foidel Creek alluvial wells and for the underground discharge. TCC Response As previously discussed, a portion of tl~e increase in mine discharge conductivity would appear to be related to the progression of mining in conjunction with the migration of water from the Area 2 pit into the Wadge as originally projected. The increased conductivity from the mine discharge then in turn would appear to have affected the Pond D discharge. It must be noted, however, that these flows are not the sole components of the discharge to Foidel Creek, as a number of ponds, including Pond F (receiving Site 114 flows) also discharge above the alluvial wells in question. You will also note that (on Figure 22) alluvial well 009-S-10 also displays the increasing trend, and that this well is upstream of any influence of TCC mina discharge. As such, it would appear that the mine discharge has had some influence