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<br />reliable conductivity measurements can be obtained and a consistent relationship to <br />TDS values established. <br />4, Revised Page 4.6-141 contains the statement '"Total dissolved solids will be measured <br />indirectly by measuring electrical conductivity..:'. It would appear that this statement <br />was inadvertently left in the text, and should have been removed with the termination <br />of the use of mathematical equations to derive TDS values. Please remove the <br />statement from the text. <br />5. Pages 2.5-A-8, -13, and -14 include data from water monitoring conducted in 1992, with <br />the exception of data from the first quarter of 1992. Please include Spring 1992 <br />monitoring data in the tables. <br />6. Spoil spring WR-1 exhibits increasing sulfate levels since 1984. Sulfate levels in this well <br />are approaching material damage suspect levels specified by the Colorado Department <br />of Health for livestock watering. Since there are agricultural and domestic uses of Trout <br />Creek water downstream from the mine, the potential hydrologic consequences of <br />sulfate contributions to Trout Creek should be addressed in the permit application. The <br />PHC should include specific long and short term predictions of sulfate levels in spoil <br />wells and the projected impacts of sulfate additions to Trout Creek. <br />7. The revised Table of Contents submitted included permanent design sections for the <br />West Ridge and Center Ridge ponds. Those sections should not be included in the <br />table of contents until Permit Revision 03 has been approved. <br />If you have questions or are in need of additional information, please contact me. We would <br />be happy to meet with you to discuss these application adequacy issues. Please call me if you <br />would like to schedule a meeting. <br />Sincerely, <br />~L(9'CU~G~rl ~~~`v4,l~e~t <br />Susan L Morrison <br />Reclamation Specialist <br />SLM\010493. WP <br />c: David Beverlin, P&M <br />Shawn Smith, CDMG <br />Susan Hoffineister <br />4 <br />January 04, 1993 <br />