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Cotter Corporation Water Quality Assessment CO0036251 <br />The Division evaluates ambient water quality based 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, and as outlined in the Division's <br />Policy for Characterizing Ambient Water Quality for Use in Determining Water Quality Standards Based <br />Effluent Limits (WQP -19). Ambient water quality is evaluated in this WQA analysis for use in <br />determining assimilative capacities and in completing antidegradation reviews for pollutants of concern, <br />where applicable. <br />To conduct an assessment of the ambient water quality upstream of the JD -7 and JD -9 Mines' WWTF, <br />data were gathered from WQCD sampling location 85 (Dolores River above confluence with San <br />Miguel). Data from this location were available for a period of record from January 1970 through May <br />2005. Note that although these data are based on samples collected at downstream locations, they are <br />comparable to data representative of upstream water quality. A summary of these data is presented in <br />Table A -6. <br />Appendix A (wQA V 7.0) <br />Page 15 of 23 Last Revised 06/10/10 /AO <br />