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1111111111111111111 <br /> / 999 <br /> mq�77-37K AL <br /> St?i1 NYSIDE GOLD CORPORATION <br /> All ECRO 8AT COMPANY <br /> P.O. Box 177 .Silverton, CO 81433 RECEIVED <br /> Phone (303) 387-5533 .Telecopy (303) 387-5310 <br /> October 19 , 1994 OCT 24 1994 <br /> Patricia A. Nelson, Industrial Unit Chief �L)ivjsbn0tMnerats&u8dogy <br /> _lam Colorado Department of Public Health and Enforcement <br /> V WQCD-PE-B2 <br /> 4300 Cherry Creek Drive South <br /> Denver , CO 80222-1530 <br /> RE: CDPS No. CO-0027529 and CDPS No. CO-0036056 <br /> Tracer WET test resul'tsJ- American Tunnel discharge water <br /> Dear Ms. Nelson: <br /> The lab report for the chronic WET tests run to determine the <br /> concentration at which chronic effects could be expected from NaBr <br /> addition to treated American Tunnel water is attached for your <br /> review as promised in my September 14, 1994 letter. <br /> These tests were run on samples composited with the 3rd Quarter WET <br /> test for the American Tunnel discharge. This report is also <br /> attached for comparison of American Tunnel water test results (100% <br /> concentration) with the various concentrations of NaBr in 100% <br /> American Tunnel water . <br /> It appears that addition of NaBr slightly reduces the lethality <br /> effects of the water on Ceriodaphnia but increases the reproductive <br /> effects. The results were consistent with the literature values <br /> for reproductive and lethal effects for Ceriodaphnia. No toxicity <br /> effect was observed on Fathead Minnows at the tested concentrations <br /> which is also consistent with literature values. <br /> It will take additional tests with dilutions to pinpoint the <br /> concentration of NaBr where the American Tunnel would pass the <br /> reproductive part of the WET test at the IWC of 10. 3% although it <br /> appears to be in the 1 ppm range. Whether this additional testing <br /> is justified will in part depend on your response to my September <br /> 14, 1994 letter request for an official position by CDPHE on the <br /> use of the tracer . <br /> Please contact me if you have any questions or wish to discuss any <br /> of the above. <br /> Sincerely, <br /> Larry Perino <br /> Superintendent-Technical Services <br /> cc: Allen Sorenson DMG w/enclosures <br /> Chris Hayes w/enclosures <br /> Bill Robb w/enclosures <br />