Laserfiche WebLink
.107*01 COLORADO <br /> t Department of Public <br /> Health b Environment Water Quality Control Division Fact Sheet,Permit No. C00048939 <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 Selenium - There are no data available regarding the presence/absence or quantification <br /> of this parameter in the discharge, so a qualitative RP analysis was conducted. Selenium is an element that is <br /> present in shale, which is prevalent in Colorado geology. Mining operations, expose rock to air and water <br /> creating a potential for selenium to be present in elevated concentrations. Further, as provided in the <br /> development document for the federal ELG, selenium can be present in the effluent from some placer mine <br /> operations. Therefore, monitoring via a "report" requirement has been added to the permit to characterize <br /> the effluent water quality for this parameter. <br /> Potentially Dissolved Silver -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 silver to be present in elevated concentrations. Further, <br /> as provided in the development document for the federal ELG, silver 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 Zinc - 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 zinc to be present in elevated concentrations. Further, as <br /> provided in the development document for the federal ELG, zinc 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 /> Organics- The effluent is not expected or known to contain organic chemicals, and therefore, limitations for <br /> organic chemicals are not needed in this permit. <br /> Whole Effluent Toxicity (WET)Testing -WET testing is not required at this time. The process for the Scott Blue <br /> II Mine is not expected to produce significant volume of toxic or industrial wastes. Scott Blue II placer mine <br /> does not use any chemical additives and treatment is gravity separation, which is not expected to introduce <br /> toxic contaminants. Aquatic life toxicity parameters (metals) are expected to be controlled by the effluent <br /> limitations. <br /> Due to the above statements, and in accordance with Section 61.8(2)(b)(i)(B)of the Colorado Discharge Permit <br /> System Regulations, the discharge does not have the reasonable potential to cause, or measurably contribute <br /> to, an excursion above any narrative standards for water quality. Therefore, WET testing is not a requirement <br /> of this permit. However, the Division reserves the right to reopen the permit to include WET testing, should <br /> facility conditions change or if new information becomes available. <br /> C. Parameter Speciation <br /> Total / Total Recoverable Metals (EXCEPT Arsenic) <br /> For standards based upon the total and total recoverable methods of analysis, the limitations are based upon <br /> the same method as the standard. <br /> Total / Total Recoverable Arsenic <br /> For total recoverable arsenic, the analysis may be performed using a graphite furnace, however, this method <br /> may produce erroneous results and may not be available to the permittee. Therefore, the total method of <br /> analysis will be specified instead of the total recoverable method. <br /> Total Mercury <br /> Until recently there has not been an effective method for monitoring low-level total mercury concentrations in <br /> either the receiving stream or the facility effluent. To ensure that adequate data are gathered to show <br /> Page 9 of 17 <br /> lUf-E <br /> 4300 Cherry Creek Drive S.,Denver,CO 80246-1530 P 303-692-2000 www.colorado.gov/cdphe/wgcd <br /> John W. Hickenlooper,Governor I Larry Wolk,MD,MSPH,Executive Director and Chief Medical Officer CO <br /> STBZi T,: : :pp:BT peutreas <br />