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• <br />TABLE 11 <br />1990-1991 <br />Receiving Stream Standards for Segment 5 of the <br />San Miguel River and Nucla Surface Sites <br /> 1991 Concentration Range <br /> 1 <br />Chemical <br /> Parameter _ ___Standard___ ___ SV_N1_ _ SV-N3 NPDES 001 _NP DES 006 _ _ SW-N7 <br /> As 50 ug/l < 1-2 < 1-3 < 1-4 < 1 < 1-5 <br /> B 750 ug/t 120-180 180-260 190-280 120 130-230 <br /> 2 <br /> Cd 1 ug/l < 5 < 5 < 5 < 5 < 5 <br /> 3 <br /> Cr 25 u9/l -- -- -- -- -- <br /> Cu 18 ug/l < 10 < 10 < 10 < 10 < 10 <br /> 4 <br /> Fe 1 mg/L .12-.53 .30-.31 .OS-.66 . OS-.53 .13-3.58 <br /> Pb 25 ug/t < 20 < 20-20 < 20-20 40 < 20-20 <br /> 4 <br /> Mn 1 mg/L .17-.26 .29-.97 .19-.70 .03 .09-1.19 <br /> 5 <br /> <br /> Ni 100 ug/l < 20 < 20 < 20 < 20 < 20 <br /> 6 <br />• pH 6.5-9.0 8.22-8.24 7.90-7.96 7.25-8.25 7 .23-8.44 8.12-8.36 <br /> 2 <br /> Se 20 ug/l < 1 < 1 < 5 < 7 < 1 <br /> 3 <br /> Ag 0.1 u9/l __ -_ __ -_ _- <br /> Zn ___ _,_85 ug[t__ 30-40 20-50 30-40 < 10 10-80 <br />1 <br />Metals are expressed acoverabl es, except as noted <br />2 <br />Detection limit of 5 ug/l <br />3 <br />Parameter no[ analyzed <br />4 <br />Fe and Mn expressed as <br />5 <br />Detection limit of 0.1 <br />6 <br />Field pH, in standard <br />,/ <br />u <br />Colorado Department of 83 (Revised 1986) <br />21 <br />