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1 <br />Chemical <br />Parameter <br />As 50 ug /l < 1 -2 < 1 -3 < 1 -4 < 1 < 1 -5 <br />B 750 ug /l 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 ug /l <br />Cu 18 ug /L < 10 < 10 < 10 • < 10 < 10 <br />4 <br />Fe 1 mg /l .12 -.53 .30 -.31 .05 -.66 .05 -.55 .13 -3.58 <br />Pb 25 ug /l < 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 />Hg .05 ug /l < .1 < .1 < .1 < .1 < .1 <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 />Se 20 ug /l < 1 < 1 < 5 < 1 < 1 <br />3 <br />Ag 0.1 ug /l <br />Zn 85 u2/l 30 -40 20 -50 30 -40 10 10 -80 <br />1 <br />Metals are expressed acoverables, except as noted <br />2 <br />3 <br />4 <br />Detection limit of 5 ug /l <br />Parameter not analyzed <br />Fe and Mn expressed as <br />5 <br />Detection limit of 0.1 <br />6 <br />Field pH, in standard <br />Standard SW -N1 SW -N3 NPDES 001 NPDES 006 SW -N7 <br />Colorado Department of 83 (Revised 1986) <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 />21 <br />