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Oxbow Mining W WTF Water Quality Assessment CO-0000132 <br />and Lower Dolores River Basins, section NF, page 10. The stated value of 400 mg/I was used in <br />TVS standard calculations, with the results shown in Table A-3. <br />The Dissolved Selenium chronic standazd in Table A-3 is specified as existing ambient quality. The <br />existing ambient quality of 10.6 ug/1 was derived from the WQCD Document Rationale for <br />Class cations, Standards andDesignations of Segments ofthe Gunnison and Lower Dolores River <br />Basins, section NF, page 10. <br />Ambient Water Quality <br />The WQCD evaluates ambient water qualitybased on a variety of statistical methods as prescribed in <br />Section 31.8(2)(a)(i) and 31.8(2)(b)(i)(B) of the Colorado Department of Public Health and <br />Environment Water Quality Control Commission Regulation No. 31. The ambient water quality was <br />not assessed for Sanborn Creek and Elk Creek because the background in-stream low flow condition <br />is zero, and because no ambient water quality data are available for Sanborn Creek and Elk Creek <br />upstream of the Oxbow Mining, LLC WWTF discharges. <br />Appendix A Page 4 of 10 Draft <br />