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PAGE 1 <br />TABLE 23 <br />SUMMARY OF WATER QUALITY DATA <br /> STATION 24, MIDDLE CREEK MINE DISCHARGE <br />PARAMETER MEAN STD. DEV. MAX. MIN . UNITS. N0. PER10D <br />PHYSICAL PROPERTIES <br />TEMPERATURE FIELD 13 .795 6 .079 25.000 3. 000 DEGREES C 44 7/79- 5/91 <br />CONDUCTIVITY FIELD 1747 .545 527 .111 2990.000 479. 000 UMHOS/CM 44 7/79- 5/91 <br />CONDUCTIVITY LAB 1763 .333 575 .520 2420.000 1300. 000 UMHOS/CM 3 4/90- 5/91 <br />PH FIELD 7 .502 0 .471 8.600 6. 500 PH 49 7/79- 5/91 <br />PH LAB 7 .600 0 .000 7.600 7. 600 PH 1 4/87 <br />HARDNESS TOTAL 1070 .333 342 .058 1306.000 676. 000 MG/L 3 4/90- 5/91 <br />SOLIDS DISSOLVED 1966 .969 574 .309 3230.000 664. 000 MG/L 33 7/79- 4/90 <br />SOLIDS SUSPENDED <30 .142 S1 .1B0 276.000 6. 000 MG/L 2B 7/79- 4/BB <br />SOLIDS SETTLEABLE <0 .220 0 .177 0.600 <0. 100 ML/L 34 4/04- 5/91 <br />OILBGREA SE VISI 2 .000 0 .000 2.000 2. 000 33 7/84- 5/91 <br />CATIONS <br />CALCIUM DISSOLVED 220 .333 61. 156 2fi1.000 150. 000 MG/L 3 4/90- 5/91 <br />MAGNESIUM DISSOLVED 126 .666 47. 427 166.000 74. 000 MG/L 3 4/90- 5/91 <br />SECONDARY <br />IRON TOTAL 317 .916 295. 987 1500.000 50. 000 UG/L 24 7/79-1 0/86 <br />MANGANESE TOTAL 570 .500 226 .029 920.000 70. 000 UG/L 20 7/79- 4/86 <br />U = MICRO <br />START <br />