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CYPRUS YAMPA~LEY COAL CORPORATION: MINE NO. I, 2, AND ECKMAN PARK • 2000 ANNUAL HYDROLOGIC REPORT SUMMARY OF WATER QUALITY DATA summary of water quality data-Ill.brw CATEGORY PARAMETER ANALYSIS TYPE AVERAGE STD. DEV. ~LAXIMUM MINIMUM UNITS COUNT REGIN END PHYSICAL PROPERTIES TEMPERATURE FIELD 12.43 4.40 22.00 1.40 DEGREES C 32 05/93 OS/00 CONDUCTIVITY FIELD 4,001.88 559.58 5,060.00 2,610.00 UMHOS/CM 32 05/93 OSI00 LAB 4,274.58 367.40 4,680.00 3,310.00 UMHOS/CM 12 05/95 II/99 PH FIELD 7.19 0.34 7.80 6.60 PH 72 05/93 OS/00 LAB 7.28 0.30 7.70 6.84 PH 7 06/97 II/99 ALF:ALMITY TOTAL 587.73 49.76 655.00 502.00 MG/L II 05/95 05/99 HARDNESS AS CACO3 3,258.00 1,640.85 7,910.00 2,560.00 MG/L 10 05/95 II/98 SOLIDS SUSPENDED 23.50 32.13 100.U0 0.00 MG/L 12 05/95 II/99 TOTAL-DiSS 4,309.17 225.73 4,620.00 3,860.00 MG/L 12 05/95 II/99 OIL&GREASE VISIBLE NOT APPLICABLE 2.00 0.00 2.00 2.00 UNDEFNED 8 05/93 08/96 CATIONS CALCIUM DISSOLVED 422.33 136.43 522.00 0.00 MG/L 12 05/95 II/99 MAGNESIUM DISSOLVED 448.67 397.52 1,660.00 0.00 MG/L 12 05/95 II/99 SODIUM DISSOLVED 216.86 104.90 390.00 0.00 MG/L 12 05/95 11/99 SAR NOT APPLICABLE 1.57 0.96 246 0.00 UNDEFINED 7 09/95 05/99 ANIONS BICARBONATE AS HCO3 717.88 59.25 786.00 612.00 MG/L 12 05/95 11/99 CARBONATE AS CO3 0.00 0.00 O.IF) 0.00 MG/L 12 05/95 II/99 HYDROXIDE AS OH 0.00 0.00 0.00 0.00 MG/L I I 05/95 05/99 SULFATE NOT APPLICABLE 2,570.67 218.91 2,900.00 2,210.00 MG/L 12 05/95 II/99 PRIMARY CADMIUM TOTAL 0.00 0.00 0.00 0.00 UG/L 2 05/98 09/98 TOTAL RECOV 0.05 0.16 0.50 0.00 UG/L 10 05/95 11/99 MERCURY TOTAL 0.00 0.00 0.00 0.00 UG/L 2 05/98 09/98 TOTAL RECOV 0.00 0.00 0.00 0.00 UG/L 10 05/95 11/99 SELENIUM TOTAL 0.00 0.00 0.00 0.00 UG/L 2 05/98 09/98 TOTAL RECOV 0.80 0.92 2.U0 0.00 UG/L 10 05/95 11/99 SILVER TOTAL 0.00 0.00 0.00 0.00 UG/L 2 05/98 09/98 SECONDARY SILVER TOTAL RECOV 0.17 0.36 0.90 0.00 UG/L 10 05/95 II/99 ZMC TOTAL 0.00 0.00 0.00 0.00 UG/L 2 05/98 09/98 TOTAL RECOV 20.60 22.59 70.00 0.00 UG/L 10 05/95 11/99 IRON TOTAL 155.00 77.78 210.00 100.00 UG/L 2 05/98 09/9R TOTAL RECOV 226.50 280.52 920.00 10.00 UG/L 10 05/95 11/99 MANGANESE TOTAL 355.00 289.91 560.00 150.00 UG/L 2 05/98 09/98 TOTAL RECOV 512.10 215.97 752.00 210.00 UG/L 10 05/95 II/99 TRACE METALS MOLYBDENUM TOTAL 0.00 0.00 0.00 0.00 UG/L 2 05/98 09/98 TOTAL RECOV 0.00 0.00 0.00 0.00 UG/L 10 05/95 II/99 NUTRIENTS NITROGEN AMMIUM-TOTAL 0.17 0.12 0.38 0.00 MG/L 12 05/95 II/99 AMMIA-FREE 0.00 0.00 0.00 0.00 MG/L II 05/95 05/99 NITRATE 6.69 2.94 10.50 0.40 MG/L 12 05/95 II/99 NITRITE 0.00 0.00 0.00 0.00 MG/L 10 09/95 II/99 TABLE 40A SITE: OVBITD (SPOIL SPRING OVBITD,ECKMAN PARK)