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<br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Table 4 <br /> <br />~eo.-end,:d Water ~llty_ Crlt.eria and Proposed Standards <br /> <br /> Recomrended EPA <br /> Par-arreter Units Criteri.a (EPA, 1976) <br /> Temperature Oc <br /> pH S.U. 6.5-9.0 <br /> 0.0. mg/1 <br /> Hardness mgjl as <br /> CaC03 >20h <br /> AlKalinity mgfl as ~ <br /> CaC03 5009 <br /> TDS m9/1 <br /> TSS mg/l 25-nedian <br /> Magnesium m9/1 <br /> Sodium mg/l 270 <br /> Chloride mg/l 250. <br /> Aluminum .9/1 5000' (EPA, 1973b) <br /> Arsenicd .9/1 50 <br /> Cadmi urn .9/1 0.4 <br /> Chromi:r .9/1 50 <br /> Copper .9/1 c <br />..... Iron \lg/1 1000 <br />Q) Leadd U9/1 30 (EPA, 1973b)< <br /> Manganese .9/1 200 <br /> Molybdenum. u9/1 10 (EPA, 1973b) <br /> seleni:r .9/1 10< <br /> Silver .9/1 50c <br /> lined .9/1 < <br /> Boron .g/1 750 <br /> Fluori dee mg/1 2 (EPA, 1973b) <br /> Ni tra te mg/l as N 10 <br /> Total Phosphorus mgJl as P 0.1 <br /> <br />Proposed Colorado <br />Standards {COH. 1976)a <br />20, 30 <br />6,5,9.0 <br />5.0, 7.0 <br /> <br />Effective Colorado <br />Standards (COH. 1974) <br />20. 32 <br />6.0-9.0 <br />5.0, 6.0 <br /> <br />25b <br />125 <br /> <br />250 <br />100 <br />10 <br />0.4 <br />50 <br />10 <br />500 <br />4 <br />200 <br /> <br />10 <br />0.1 <br />50 <br />750 <br />2f <br />4 <br />0.1 <br /> <br />a The values shown are based upon the most restrictive water use and water hardness encountered in the White River study area. <br /> <br />b This concentration represents the maxiumum allowed due to man's activities. <br /> <br />c A 96-holJr LCSO bioassay test "is recomm=nded in order to establish a limit for the particular water bOdy b question.. <br /> <br />d Criteria limits, vary according to water hardness. The roost restrictive limit for the softest water found in the White <br />River drainage (less than 100 mg/l total hardness) is shown. <br /> <br />e Fluoride criteria for drinking water are dependent upon ambient air temperatures at the roonitoring site. <br /> <br />f This value is an "alert" level on'ly; the proposed standard is 10 mg/l. <br /> <br />9 Water having concentrations of TDS in excess of the stated value may have detrirrental effects when used in f rrigation. <br /> <br />h Although no upper limit is recormended, concentrations in excess of 500-600 mg/l as Caco3 indicate highly mineralized water <br />which may be unsuitable for sane uses. <br /> <br />f This value applies to water used for livestock watering. .Bioassay research indicates tha.t considerably lower concentrations <br />(<1 mgjl) may be required to protect aquatic life (Everhart and Freeman~ 1973}~ <br /> <br />. <br /> <br />. <br /> <br />Q <br />o <br />N <br />00 <br />(,0 <br />o <br />