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<br />Mr. David Berry <br />October 4, 1988 <br />Page 12 <br />CYVCC RESPONSE: <br />Alluvial Wells <br />Fn~~Creek Well s <br />The data does indicate an increasing dissolved solids for the well; however, <br />it is apparent from the data that the water level is declining. This <br />increase in dissolved solids may be associated with the decreasing water <br />table. The well is part of the ongoing monitoring program and the data will <br />be analyzed to determine if this trend will continue. <br />In reference to the nitrate concern, the concentration of nitrate and <br />nitrate + nitrate differ by only .001 mg/1. This difference is within the <br />analytical error of these measurements. <br />Foidel Creek Wells - - <br />As indicated in the Division's comment, the wells will be continued to be <br />monitored to determine if there are mine related impacts. <br />a) The April 7, 1984 data for Well 001-5-5 will be removed from the <br />data base. <br />b) The lead concentration reported for April 7, 1984 sample from Well <br />001-5-5 was entered correctly. <br />CMLRD CONCERN: <br />Spoil Springs <br />Numerous spoil springs are monitored throughout the Mine 1, Mine 2 and <br />Eckman Park mine areas. The data indicate possible increasing electrical <br />conductivity and/or total dissolved solids at spring 114, C-1, C-2, Dcomp, <br />and J. Iron levels may be increasing at springs A-2 and Dcomp. High silver. <br />values have been recorded at springs 114, A-2, C-1, Dcomp, E, J and <br />EP-81-1. Relatively high zinc values have been reported for springs 114 and <br />E. Finally, a relatively high nitrate value was recorded during 1987 at <br />spring EP-87-1. <br />Please provide your interpretation of the elevated silver value s.~V"/ ~y~ <br />CYVCC RESPONSE: 114~~ <br />~, r <br />S op it S rin s ~~ <br />A review of the data indicates that "elevated" silver levels are not found <br />at all stations, nor are they found during all sampling episodes: Also, <br />there is no known source of silver in the area. Given the above, it is <br />impossible to determine a cause for the "elevated" silver concentrations. <br />Discussions have been held with the laboratory to determine if there is an <br />analytical problem associated with this metal. The extremely low detection <br />limit established for silver does cause analytical problems, and the <br />resultant concentrations may be caused by laboratory procedures. <br />Je <br />Jn <br />