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1 <br />2 <br />Parameter not analyzed <br />Detection limit of 5 ug /l <br />TABLE 10 <br />Comparison of 1991 Surface Water Quality With <br />Livestock Drinking Water Standards <br />1991 Maximum Concentrations <br />Chemical Livestock NPDES NPDES <br />Parameter Standard SW -N1 SW -N3 SW-N7 001 006 <br />Al 5 mg /l 1.02 0.2 3.17 .13 < 5 <br />As 200 ug /l 2 3 • 5 4 < 1 <br />B 5000 ug /l 180 260 230 280 120 <br />Cd 50 ug /l < 5 < 5 < 5 < 5 < 5 <br />1 <br />Cr 1000 ug /l <br />Cu 500 ug /L < 10 <--- 10=- -- < -10 < 10 < 10 <br />F 2 mg /l 1.0 1.1 1.5 0.9 0.62 <br />Pb 100 ug /l < 20 20 20 20 40 <br />Mn 500 mg /l 0.26 0.97 1.19 0.70 0.03 <br />Hg 10 ug /l < 0.1 < 0.1 < 0.1 < 0.1 < 0.1 <br />NO3 /N 100 mg /l .11 .12 .04 < .02 < .02 <br />NO2 /N 10 mg /l < .01 < .01 < .01 < .01 < .01 <br />Se 5 ug /l < 1 < 1 < 1 < 5 < 1 <br />Ca 1000 mg /1 222 403 222 549 133 <br />Na 2000 mg /l 71 96 79 81 28 <br />SO4 3000 -5000 mg /l 856 1667 770 2103 348 <br />Alk 2000 mgLL 384 396 458 328 232 <br />McKee and Wolf, 1963; Botz and Pedersen, 1976; and National Academy of Sciences, 1974 <br />20 <br />