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PAGE 1 <br />TABLE 22 <br />SUMMARY OF WATER DUALITY DATA <br />WATER YEAR 1991 <br />STATION 24, MIDDLE CREEK MINE DISCHARGE <br />PARAMETER MEAN STD. DEV. MAX. MIN. UNI75. N0. PERIOD <br />PHYSICAL PROPERTIES <br />TEMPERATURE FIELD 11. 250 2. 061 14. 000 9 .000 DEGREES C 4 4/91- 5/91 <br />CONDUCTIVITY FIELD 1295. 000 602. 522 1900. 000 420 .000 UMHOS/CM q 4/91- 5/91 <br />CONDUCTIVITY LAB 989. 000 736. 805 1510. 000 469 .000 UMHOS/CM 2 4/91- 5/91 <br />PH FIELD 8. 250 0. 099 8. 400 8. 200 PH 4 4/91- 5/91 <br />HARDNESS TOTAL 442. 000 329. 511 675. 000 209. 000 MG/L 2 4/91- 5/91 <br />SOLIDS SETTLEABLE <0. 200 0. 000 <0. 200 c0. 200 ML/L 2 4/91- 5/91 <br />OIL6GREASE VI SI 2. 000 0. 000 2. 000 2 .000 4 4/91- 5/91 <br />CATIONS <br />CALCIUM DISSOLVED 93. 000 62. 225 137 .000 49 .000 MG/L 2 4/91- 5/91 <br />MAGNESIUM DISSOLVED 51. 000 42. 426 BI. 000 21 .000 MG/L 2 4/91- 5/91 <br />ANIONS <br />SULFATE 782. 000 0 .000 782 .000 782 .000 MG/L 1 5/91 <br />GASES <br />SULPHIDE TOTAL 0. 600 0 .000 0. 600 0 .600 MG/L 1 5/91 <br />ORGANICS <br />OILBGREASE 10. 500 13 .435 20 .000 1 .000 MG/L 2 5/91 <br />U = MICRO <br />START <br />