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TABLE 1 (coot) <br />Historic Summary of Water Oaulity <br />at PRS - 1, Middle Fork of the Purgatoire <br />River, above New Elk Mine <br /> <br /> <br />SAMPLING DATE Data <br />Entry Minimum <br />Value <br />1989 Maximum <br />Value <br />1989 Mean <br />Average <br />1999 Minimum <br />Value <br />1990 Maximum <br />Value <br />1890 Mean <br />Average <br />1990 Minimum <br />Value <br />1991 Maximum <br />Value <br />1991 Mean <br />Average <br />1991 Minimum <br />Value <br />1892 Maximum <br />Value <br />1992 Mean <br />Average <br />1992 Minimum <br />Value <br />1993 Maximum <br />Value <br />1993 Mean <br />Average <br />1993 <br />Paremeter Units <br />Stall Gauge feet 0.2 0.6 0.35 0.12 0.42 0.2516 0.1 0.6 0.31 0.00 0.50 0.27 0.19 0.85 0.38 <br />Flow cfs 17.26 17.6 17.43 - - - - - - - - - 9.12 59.20 23.35 <br />pH standard 6.9 9.2 8.16 7.27 9.5 8.23 6.88 8.36 7.89 7.23 8.18 7.66 7.40 9.04 8.20 <br />Conductivity umhos/cm 280 590 355.13 179 420 268.83 152 239 206.33 195.00 955.00 334.30 123.00 380.00 237.62 <br />Temperature 'C 0.6 22.5 10.1 0.7 24.2 12.4 5.8 21.1 12 35.00 69.00 49.72 3.44 14,17 9.02 <br />Dissolved Oxygen ppm 5 12.7 9.38 7.5 11.8 9.8 7 17.3 10.6 8.70 13.20 10.80 7.70 14.80 9.55 <br />Iran mg/I 0.1 0.11 0.23 0.73 0.75 <br />TSS mg/I 10 8 B 2.50 2,50 <br />TOS mgll 177 190 236 180.00 170.00 <br />TCS mg/I 10 62 5 30.00 66.00 <br />Carbonate mg/l 1 3 0.5 2.50 0.50 <br />Bicarbonate mgll 141 146 176 170.00 140.00 <br />Manganese mg/I 0.01 0.04 0.03 7.10 0.0125 <br />Sodium mgll 8.8 7 9 5.70 6.00 <br />Chloride mg/I 1.2 i.6 1.9 2.26 2.00 <br />Sulfate mgll 31 44 42 32.00 26.00 <br />Calcium mg/1 43 47 55.1 39.00 42.00 <br />Magnesium mgll 7.3 8 10.5 7.70 8.00 <br />Potassium mg/I 0.92 1 1.34 0.70 1.00 <br />Hydroxide mg/I 0.5 <7 0.5 0.50 0.50 <br />Fluoride mg/I 0.3 0.4 0.05 0.35 0.25 <br />Lead mg/I 0.025 <0.05 0.025 0.01 0.03 <br />Selenium mgll 0.05 e0.1 0.05 0.001 0.003 <br />SAR standard 0.24 0.25 0.29 0,22 0.22 <br />• • • <br />