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Hydrologic Monitoring Plan <br />Northfield Mine <br />Revised 12/19/2007 <br />TABLE 5 <br />TDS Water Quality Standards <br />Reference:CDPHE WQCD 100214 Basic Standards <br />These standards apply only to compliance point CCA1. <br />Background TDS Value (mg/L) Maximum Allowable TDS <br />Concentrations <br />0-500 400 mg/L or 1.25 tmes the background <br />level, whichever is least restrictive <br />501-10,000 1.25 times the background value <br />10,001 or greater No limit <br />• <br />• 13 <br />