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Twentymile Coal Company Water Quality Assessment <br />000042161 <br />the Regulations specifies that the antidegradation review procedures apply when new or increased <br />. impacts occur. In the case of the Twentymile Coal Company, the facility has not applied for new or <br />increased dischazge as part of their permit application process. Thus, the antidegradation review <br />process is satisfied with no further evaluation required. <br />VI. References <br />USGS Water Data Retrieval. http://waterdata.usgs.gov/nwis-w/CO/. <br />Colorado Total Maximum Daily Load and Wasteload Allocation Guidance, CDPHE WQCD, <br />November 1991. <br />Classification and Numeric Standards for Upper Colorado River Basin and North Platte River <br />(Planning Region 12), Regulation 33, CDPHE, January 30, 1999. <br />The Basic Standards and Methodologies for Surface Water, Regulation 31, CDPHE, No date. <br />Colorado River Salinity Standards, Regulation 39, CDPHE, August 30, 1997. <br />Other data used in this assessment may be available from the CDPHE. <br />u <br /> <br />Appendix A Page 12 of 12 <br />