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PAGE 2 <br />PARAMETER <br />SECONDARY <br />ZINC <br />IRON <br />MANGANESE <br />TRACE METALS <br />MOLYBDENUM <br />NUTRIENTS <br />NITROGEN <br />NITROGEN <br />NITROGEN <br />NITROGEN <br />PHOSPHATE <br />U = MICRO <br />START <br />TABLE 18 (CONTINUED) <br />SUMMARY OF WATER OUALITV DATA <br />WATER YEAR 1991 <br />MIDDLE CREEK ABOVE MINE 3, USGS SITE 09243700 <br />MEAN STD. DEV. MAX. <br />TOTAL RECO <35.000 26.457 70.000 <br />TOTAL RECO 685.000 394.672 1230.000 <br />TOTAL RECD 292.500 310.995 760.000 <br />MIN. UNITS <br />N0. PERIOD <br /><10.000 UG/L <br />340.000 UG/L <br />70.000 UG/L <br />4 4/91- 0/91 <br />4 4/91- B/91 <br />4 4/91- 0/91 <br />TOTAL RECD <50.000 0.000 <50.000 <50.000 UG/L 4 4/91- B/91 <br />AMMIUM-TOT 0.067 0. 017 0.090 0 .050 MG/L 4 4/91- 9/91 <br />AMMIA-FREE 0.009 0. 003 0.013 0 .005 MG/L 4 4/91- 9/91 <br />NITRATE <0.085 0. 129 0.290 <0 .020 MG/L 4 4/91- 8/91 <br />N03tN02 c0.OB2 0. 124 0.270 <0. 020 MG/L 4 4/91- 0/91 <br />ORTHO-0255 <0.009 0. 002 <0.010 <0. 005 MG/L 4 4/91- 9/91 <br />