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TWENTYMILE C.COMPANY i • PERMIT REVISION 6 PERIOD OF RECORD WATER QUALITY DATA CATEGORY PARAMETER ANALYSIS TYPE AVERAGE STD. DEV. MAXIMUM MINIMUM UNITS COUNT BEGIN END PHYSICAL PROPERTIES TEMPERATURE FIELD 9.63 3.68 20.00 2.60 DEGREES C 253 09/80 12/02 CONDUCTNHY F[ELD 990.81 237.06 1,425.00 390.00 UMHOS/CM 252 09/80 12/02 LAB 1,068.66 144.94 1,620.00 780.00 UMHOS/CM 61 10/86 11/02 '~ PH FIELD 7.40 0.34 8.21 6.20 PH 252 09/80 12/02 LAB 7.42 0.20 8.00 7.10 PH 24 07/86 11/02 ALKALINITY TOTAL 308.33 52.64 630.00 196.00 MG/L 52 07/86 08/99 ACIDITY AS CAC03 8.67 9.02 18.00 0.00 MG/L 3 11/80 11/81 HARDNESS AS CAC03 496.54 94.92 847.00 270.00 MG/L 74 09/80 08/99 SOLIDS SUSPENDED 2,762.00 0.00 2,762.00 2,762.00 MG/L 1 06/91 06/91 TOTAL-DISS 756.85 167.72 1,580.00 470.00 MG/L 85 09/80 11/02 CATIONS CALCIUM DISSOLVED 119.91 33.05 310.00 12.00 MG/L 84 09/80 II/02 MAGNESIUM DISSOLVED 48.17 11.21 102.00 3.90 MG/L 84 09/80 11/02 SODIUM DISSOLVED 60.17 20.34 200.00 6.00 MG/L 84 09/80 11/02 POTASSIUM DISSOLVED 2.02 0.83 4.00 1.10 MG/L 10 09/80 04/83 SAR NOT APPLICABLE 1.18 0.48 4.81 0.64 UNDEFINED 73 09/80 08/99 ANIONS BICARBONATE AS HC03 372.45 59.03 756.00 220.00 MG/L 88 09/80 11/02 CARBONATE AS C03 1.01 3.45 16.80 0.00 MG/L 38 Il/81 11/02 HYDROXIDE AS OH 0.00 0.00 0.00 0.00 MG/L 18 04/95 08/99 CHLORIDE NOT APPLICABLE 8.89 2.33 13.00 5.00 MG/L 19 09/80 04/85 SULFATE NOT APPLICABLE 300.04 81.59 714.00 97.00 MG/L 89 09/80 11/02 PRIMARY ARSENIC DISSOLVED 0.95 1.81 7.00 0.00 UG/L 19 11/80 04/89 BARIUM DISSOLVED 100.00 173.21 300.00 0.00 UG/L 3 11/80 11/81 CADMIUM DISSOLVED 0.12 0.81 7.00 0.00 UG/L 76 11/80 11/02 TOTAL RECOV 1.30 0.00 1.30 1.30 UG/L 1 06/91 06/91 LEAD DISSOLVED 5.54 27.33 200.00 0.00 UG/L 65 11/80 11/02 MERCURY DISSOLVED 0.10 0.80 7.00 0.00 UG/L 76 11/80 11/02 TOTAL RECOV 0.20 0.00 0.20 0.20 UG/L 1 06/91 06/91 SELENIUM DISSOLVED 0.45 2.17 16.00 0.00 UG/L 76 I1/80 11/02 TOTAL RECOV 0.00 0.00 0.00 0.00 UG/L 1 06/91 06/91 SILVER DISSOLVED 0.00 0.00 0.00 0.00 UG/L 3 11/80 11/81 SECONDARY SILVER TOTAL RECOV 0.50 0.00 0.50 0.50 UG/L 1 O6/9l 06/91 COPPER DISSOLVED 10.00 24.49 60.00 0.00 UG/L 6 ll/80 04/83 ZINC DISSOLVED 69.05 78.70 340.00 0.00 UG/L 20 11/80 04/89 TOTAL RECOV 250.00 0.00 250.00 250.00 UG/L 1 06/91 06/91 IRON DISSOLVED 1,706.13 6,231.83 52,000.00 0.00 UG/L 84 09/80 11/02 TOTAL RECOV 126,000.00 0.00 126,000.00 126,000.00 UG/L 1 06/91 06/91 MANGANESE DISSOLVED 555.25 223.03 1,200.00 8.00 UG/L 83 09/80 II/02 TOTAL RECOV 1,240.00 0.00 1,240.00 1,240.00 UG/L I 06/91 06/91 TABLE 8S SITE: 008-AU-3 (FISH CREEK ALLUVIUM)