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all analytes, with the exception of barium, copper, manganese, and zinc returned results of "U" <br /> (i.e., compound analyzed for but not detected). With respect to the tailing water, all analytes,with <br /> the exception of barium, copper, lead, manganese, and zinc returned results of "U" (i.e., <br /> compound analyzed for but not detected). <br /> The US EPA (www.epa.4ov/dwstandardsregulations) has established National Primary Drinking <br /> Water Regulations that are legally enforceable primary standards and treatment techniques that <br /> apply to public water systems. In addition, EPA has established National Secondary Drinking <br /> Water Regulations that set non-mandatory water quality standards for 15 contaminants; however, <br /> EPA does not enforce "secondary maximum contaminant levels" (MCLs). <br /> Comparison of the SPLP results for the three sample media (e.g., crushed/milled waste rock, <br /> tailing, and tailing water, respectively), against primary and secondary drinking water standards <br /> (MCLs) provides one method for examining the constituent concentrations in context. (albeit <br /> conservative, as VRI has not confirmed the presence of any potable water supply wells within a <br /> radius of approximately 3/4-mile of the Hukill Mill Site (refer to DRMS Permit No. M2009-076—List <br /> of Wells). <br /> Thus, the analytical results (see Appendix II: Analytical Reports —Waste Rock and Tailing) <br /> for the three sample media(e.g., crushed/milled waste rock; solid tailing matrix; and, tailing water, <br /> respectively) are depicted below in Table 1-1: SPLP Leach Results on Waste Rock and <br /> Processed Tailing alongside the respective primary and secondary MCLs for each respective <br /> analyte. <br /> TABLE 1-1: SPLP LEACH RESULTS ON WASTE ROCK AND PROCESSED TAILING <br /> MCL Waste Tailing Tailing <br /> Metal (mail,) Rock Solid Li uid <br /> Arsenic 0.010 - - - <br /> Barium 2.0 0.20 0.71 0.008 <br /> Cadmium 0.005 - - - <br /> Chromium 0.1 - - - <br /> Copper 1.3 - 0.15 0.0053 <br /> Lead 0.015 - - 0.076 <br /> Manganese 0.05* 0.23 0.03 0.40 <br /> Mercury 0.002 - - - <br /> Selenium 0.05 - - - <br /> Silver 0.1* - - - <br /> Zinc 5.0* 0.39 0.073 - <br /> *Secondary Drinking Water MCL;All others are Primary Drinking Water MCL <br /> 6 <br />