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~~ 61 I Skyline Road - Laramie, WY 82070 - (307) 742-0031 <br />~~~ yyCENGINEERING FAX (307) 721-2913 - E-mail:in(olar®wwcengineering.<om <br />RECEIVED <br />July 20, 2004 <br />JUL 2 32004 <br />cnPs <br />Mr. Byron Walker <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street <br />Room 215 <br />Denver, Colorado 80203-2273 <br />RE: Edna Mine, June 2004 CPDS and Second Quarter WET Test Results <br />Dear Mr. Walker: <br />Enclosed are the Edna Mine's (Permit #CO-0032638) CPDS reporting results for the <br />above referenced monitoring period. During the month of June 2004, DMP 004 and DMP 007 <br />did not exceed any compliance criteria. Due to an oversight in the new discharge permit <br />requirements, the quarterly Total Dissolved Solids (TDS) samples were not collected for DMP <br />004 and DMP 007. The oversight has been brought to the attention of the field personnel. <br />DMP 004 and DMP 007 failed the Pimephales promelas but passed the Ceriodaphnia <br />dubia chronic Whole Effluent Toxicity (WET) test for the second quarter of 2004. P&M has <br />initiated accelerated WET testing of DMP 004 and DMP 007 in compliance with the CDPS <br />Permit. This letter is written notification of the chronic WET test failure and that accelerated <br />WET testing will be performed. <br />Please contact me at (307) 742-0031 with any questions or comments you have regarding <br />this matter. ~ <br />SL:gh <br />Enclosures <br />File: 99-144 <br />Project Engineer <br />