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The Big Mack Mine is known to have had an influence on the original upgradient alluvial <br />monitorin, well TR-I during the initial baseline study. This influence is discussed in <br />Section 2.5.2.5 (page 2.5-67) and resulted in the installation of TR-1.5 as a replacement <br />upgradient monitoring will. It should be noted that TR-l.> is located downstream of <br />where TR-1 was located. <br />TR-1.5 has not been affected by the abandoned mine or underflow from Little Trout <br />Creek due to the alignment of Trout Creek immzdiately below the Little Trout -Trout <br />Creek confluence and the spatial relationship behveen TR-1.5, the confluence and <br />discharge from the Big Mack Mine. Monitorin~~ results from over the past several years <br />indicates that the mineralized waters in the alluvium along Trout Creek generally flow as <br />a dispersing plume parallel to the creek with only a slow migration of alluvial waters <br />towards the "free water" of the creek. Alluvial water (underflow) of Little Trou[ Creek <br />would be expected to follow a similar flow pattern. Due to the placement of TR-1.5 <br />along the outer portion of the alluvium away from the creek, TR-1.5 was outside the <br />plume (on the bedrock side) of mineralized flow from Big Mack and underflow from <br />Little Trout Creek. <br />When the optical fiber cable was laid during the summer of 1995, its alignment was <br />downstream of Count}• Road 27 along the downstream edge of the alluvium common to <br />Little Trout Creek and Trout Creek. It is belizved that the activities associated with <br />laying the cable has altered the plume from zither the Little Trout Creek underflow and/or <br />the Big Mac Mine discharge as they migrate toward Trout Creek to the extent that this <br />flow now exerts an influence on the alluvial water collected at TR-1.5. <br />=1. During the lust midterm review. P&rLl committed to revise the permi[ after DA1G's review <br />of the 1999 AHR. Please submit a !ethnical revision to address those outstanding items <br />addressed in our January .i. 2000 letter. Irr the revision, please inchrde n revised Water <br />rLlonitoring Location tLlap (Exhibit -J.6-26) to include the location of DMP007. <br />Responses to the other comments in this letter can be addressed in a respatse letter. <br />A Technical Revision (TR-39) has been submitted under cover letter dated August 11, <br />2000, addressing the outstanding items from the noted letter and includes a revised <br />Exhibit 4.6-26. <br />