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tCOLORADO
<br /> Department of Public
<br /> Health b Environment Water Quality Control Division Fact Sheet,Permit No. C00048939
<br /> Potentially Dissolved Copper-There is no data available regarding the presence/absence or quantification of
<br /> this parameter in the discharge, so a qualitative RP analysis was conducted. Metals may occur naturally in
<br /> geologic media, such as rock formations, soils, and transportation through groundwater. Mining operations
<br /> expose rock to air and water creating a potential for copper to be present in elevated concentrations. Further,
<br /> as provided in the development document for the federal ELG, copper can be present in the effluent from
<br /> some placer mine operations. Therefore, monitoring via a "report" requirement has been added to the permit
<br /> to characterize the effluent water quality for this parameter.
<br /> Cyanide-There are no data available regarding the presence/absence or quantification of this parameter in
<br /> the discharge, so a qualitative RP analysis was conducted. It is unknown whether cyanide had previously been
<br /> used at the Scott Blue II mine. However, due to the length of time since the facility last processed any material
<br /> and the relatively quick rate of degradation of cyanide, a qualitative determination of no RP has been made for
<br /> this parameter and limits are not required at this time. Cyanide is not used at this operation and thus no
<br /> cyanide is expected to be introduced by previous ore processing.
<br /> Total Recoverable Iron - There are no data available regarding the presence/absence or quantification of this
<br /> parameter in the discharge, so a qualitative RP analysis was conducted. Metals may occur naturally in geologic
<br /> media, such as rock formations, soils, and transportation through groundwater. Iron is prevalent in Colorado
<br /> geology. Mining operations, expose rock to air and water creating a potential for iron to be present in elevated
<br /> concentrations. Therefore, monitoring via a "report" requirement has been added to the permit to
<br /> characterize the effluent water quality for this parameter.
<br /> Potentially Dissolved Lead - There are no data available regarding the presence/absence or quantification of
<br /> this parameter in the discharge, so a qualitative RP analysis was conducted. Metals may occur naturally in
<br /> geologic media, such as rock formations, soils, and transportation through groundwater. Mining operations,
<br /> expose rock to air and water creating a potential for lead to be present in elevated concentrations. Further, as
<br /> provided in the development document for the federal ELG, lead can be present in the effluent from some
<br /> placer mine operations. Therefore, monitoring via a "report"requirement has been added to the permit to
<br /> characterize the effluent water quality for this parameter.
<br /> Potentially Dissolved Manganese- There are no data available regarding the presence/absence or
<br /> quantification of this parameter in the discharge, so a qualitative RP analysis was conducted. Metals may occur
<br /> naturally in geologic media, such as rock formations, soils, and transportation through groundwater. Manganese
<br /> is prevalent in Colorado geology. Mining operations, expose rock to air and water creating a potential for
<br /> manganese to be present in elevated concentrations. However, the WQBEL for this parameter is 1,782 ug/l (30
<br /> day average) and 3,225 ug/l (daily maximum). While it is unlikely that potentially dissolved manganese
<br /> concentrations in a placer mine will approach these values, to verify this assumption, a "report" condition has
<br /> been added to the permit to characterize the effluent water quality for this parameter
<br /> Total Mercury-There are no data available regarding the presence/absence or quantification of this parameter
<br /> in the discharge, so a qualitative RP analysis was conducted. Further, as provided in the development
<br /> document for the federal ELG, mercury can be present in the effluent from some placer mine operations.
<br /> Therefore, monitoring via a "report" requirement has been added to the permit to characterize the effluent
<br /> water quality for this parameter.
<br /> Total Recoverable Molybdenum - There are no data regarding the presence/absence or quantification of this
<br /> parameter. Sources of molybdenum are primarily industrial processing and molybdenum mining. As
<br /> molybdenum is not generally associated with gold placer mining, and this operation is located at a high
<br /> elevation with no molybdenum mining operations upstream, a qualitative determination of no RP has been
<br /> made.
<br /> Potentially Dissolved Nickel- There are no data available regarding the presence/absence or quantification of
<br /> this parameter in the discharge, so a qualitative RP analysis was conducted. Metals may occur naturally in
<br /> geologic media, such as rock formations, soils, and transportation through groundwater. Mining operations,
<br /> expose rock to air and water creating a potential for nickel to be present in elevated concentrations. Further,
<br /> as provided in the development document for the federal ELG, nickel can be present in the effluent from some
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<br /> 4300 Cherry Creek Drive S., Denver,CO 80246-1530 P 303-692-2000 www.cotorado.gov/cdphe/wgcd
<br /> John W.Hickenlooper,Governor ! Larry Wolk,MD,MSPH,Executive Director and Chief Medical Officer CO
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