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x,..041:1/1995 13:35 303-782-0390 CDH WWCD WWCC PAGE 02 J • • COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT Water t7uality Control Division Permits end Enforcement Section INTER-0EPARTMENTAL MEMORANDUM To: Berhan Keffelew, Division of Minerals and Geology - 1313 Sherman Street From: Patricia Nelson, Industrial Permit Enfofcatnent Pro ram, Wa r puality Control Division Date: April 11, 1995IChi~1 Re: Cripple Creek and Victor Gold, CDPS Permit No. CO-0043848 Request to Utilize Water from Pond 4C for Mine-Site Dust Suppression We have reviewed the copy of the request you received from CCBV to use the water from pond 4C. While the treatment of the pond water with hydrogen peroxide will apparently be capable of greatly reducing the cyanide concentrations in the pond water, the data submitted to you by CCBV shows the final WAD cyanide concentretions to remain at 0.068 mg/I, which is above the 0.030 mg/l stream standard that applies to the surface waters in the effected watershed. Additionally, the use of hydrogen peroxide for the treatment of cyanide was probaby the cause for the extremely high levels of ammonia that were found in the treated pond water - 46 mg/l. This is much higher than concentrations that are used to estimate allowable instream rancentretions, and higher that levels that are generally regarded to be toxic to aquatic organisms. The data for the treated pond water also show very high levels for severel metals. A comparison of the data CC&V provided against the surface water stream standards for the Arequa Gulch Basin is provided below: ' Cyanide, WAD 0.030 0.088 Total Ammonia 0.2 48.0 Cadmium 0.003 0.038 Chromium 0.050 024 Copper 0.039 13.0 Mercury 0.00001 0.0013 Nickel 0.2 0.56 Zinc 0.34 0.48 Total Ammonia stream standard is estimated based upon regional anaysis. An examination of the above table shows that if the road spreying results in any surface drainage, it would need a permit since it definitey is high in pollutants.