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C ~ Cripple Creek & Victor Gold Mlning Company <br />A Joint Venture - ANOL000~0 ICOLOPADO) CARP., Meneger <br />~.7~. Y Operartlona OHlca <br />P.O. Boa 191 • 100 North 3rd Streak <br />Victor, Colorado BO880 <br />(719) 889-2977 • Fax 0719) 689.3254 <br />SENT CERTIFIED, RETURN RECEIPT <br />2 217 656 398 <br /> <br />November 16, 1999 <br />Ms. Carla J. Lenkey <br />Colorado Departmrnt of Public Health and Environment <br />Water Quality Contro] Division <br />Permits and Enforcement Section <br />WQCD-PE-2 <br />4300 Cherry Creek Drive South <br />Dcnvcr, CO 80202-1530 <br />G~ E <br />~~~ ~I~~~~~~~~~~~ ~~~ <br />sss <br />Re: Suoolemental Information Supporting Uoset Affirmative Defense <br />For Colorado Dischazee Permit Svstem Permit No. CO-0043648 <br />Deaz Ms. Lenkey: <br />On October 20, 1999 we met with you to discuss Cripple Creek & Victor Gold Mining <br />Company's ("CC&V") assertion of the affirmative defense of upset in light ofthe excessive <br />precipitation received in the southern Teller County area since April. The ezcessive precipitation <br />has resulted in CC&V repotting 3o•day average weak acid dissociable cyanide ("CNw~D") <br />concentrations slightly higher than the 0.021 mg/l value specified in the referenced permit at <br />point OOlA for the months of May, June, July, and August. Notice of upset conditions at 001 A <br />was provided to the Water Quality Control Division ("WQCD") in letters dated June 25, 1999, <br />July Z7, 1999, August 27, 1999, and September 28, 1999. <br />In a letter dated October 4, 1999 CC&V provided additional information on CNwao for the (1) <br />North Underdrain ("NUD") 24-inch diameter pipe, (2) South Underdrain ("SUD") 24-inch <br />diameter pipe, (3) four-inoh solid pipe (SP), (4) point OOIA, and (5) a sample point looated 650 <br />feet downstream of OOlA (AG 1.5+650). During the meeting on October 20, 1999, you <br />questioned the source of the CNww and the discrepancybetween CNw~D concentrations in the <br />NUD, SUD, and SP versus concrntrations at point 001 A. More specifically, you observed the <br />CNw„o values at the NUD, SUD, and SP are lower than the CNw~D concentrations at point <br />OOlA. As promised, CC&V hereby is providing additional information czplaining the origin and <br />concentration of CNwno at point OOlA. <br />Z00-9DI' ZO d lZE-1 YSZE88981lI 7M1 0107 r,!»:aDrd 9t'~EI 88-l0-730 <br />