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µg/L=microgram per Liter <br /> NA=not applicable <br /> ND=not detected <br /> TVS=table value standards <br /> Footnotes <br /> 'La Plata River flow taken from Hesperus Gage(LAPHESCO) <br /> (1)SDWA NPDWR MCL=Safe Drinking Water Act National Primary Drinking Water Regulations Maximum Contaminant Level These <br /> are legally enforceable standards that apply to public drinking water systems Primary standards protect public health by limiting the <br /> levels of contaminants in drinking water <br /> (2)SDWA NSDWR SMCL=Safe Drinking Water Act National Secondary Drinking water Regulations Secondary Maximum <br /> Contaminant Level These are non-enforceable guidelines regulating contaminants that may cause cosmetic effects(such as skin or <br /> tooth discoloration)or aesthetic effects(such as taste,odor,or color)in drinking water EPA recommends secondary standards to <br /> (3)Treatments Technique(TT) A required process intended to reduce the level of a contaminants in drinking water Lead and copper <br /> are regulated by a Treatment Technique that requires a system to control the corrosiveness of their water If more than 10%of tap <br /> water samples exceed the Action Level,water systems must take additional steps to treat the water <br /> (4)1002-31-Regulation 31-Colorado Water Quality Control Division,Tables III and IV <br /> SGM P\Project Files\2017-460 001 Sunrise Mining Company-May Day Mine\M.Water Quality\ <br /> 1 110 8/2 01 7 This 1-10-May Day Idaho Mine Complex WQ-Results-2017 xlsxSW-1 <br />