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TWENTYMILE COMPANY • <br />PERMIT REVISION 6 <br />PERIOD OF RECORD WATER QUALITY DATA <br />CATEGORY PARAMETER ANALYSIS TYPE AVERAGE STD. DEV. MAXIMOM MINIMUM UNITS COUNT BEGIN END <br />PHYSICAL PROPERTIES TEMPERATURE FIELD 10.22 4.29 20.00 0.80 DEGREES C 195 11/83 09/02 <br /> CONDUCTIVITY FIELD 2,180.07 771.45 3,700.00 598.00 UMHOS/CM 195 Il/83 09/02 <br /> LAB 2,177.24 796.41 3,960.00 718.00 UMHOS/CM 58 10/86 08/02 <br /> PH FIELD 7.56 0.54 9.23 6.01 PH 195 11/83 09/02 <br /> LAB 7.88 0.75 9.36 6.60 PH 23 10/86 08/02 <br /> ALKALINITY TOTAL 291.17 90.80 534.00 119.00 MG/L 48 10/86 08/99 <br /> HARDNESS AS CAC03 931.11 398.40 1,948.00 177.00 MG/L 54 11/83 08/99 <br /> SOLIDS SUSPENDED 486.00 0.00 486.00 486.00 MG/L 1 06/91 06/91 <br /> TOTAL-DISS 1,868.86 797.63 3,648.00 524.00 MG/L 65 11/83 08/02 <br />CATIONS CALCIUM DISSOLVED 164.76 97.78 401.00 4.30 MG/L 65 Il/83 08/02 <br /> MAGNESIUM DISSOLVED 106.39 48.13 230.00 5.00 MG/L 65 11/83 08/02 <br /> SODIUM DISSOLVED 249.43 90.19 467.00 15.00 MG/L 65 Il/83 08/02 <br /> SAR NOT APPLICABLE 3.98 0.69 5.13 1.93 UNDEFMED 53 11/83 08/99 <br />ANIONS BICARBONATE AS HC03 346.70 118.60 651.00 140.00 MG/L 69 11/83 08/02 <br /> CARBONATE AS C03 2.86 7.91 37.00 0.00 MG/L 37 02/91 08/02 <br /> HYDROXIDE AS OH 0.00 0.00 0.00 0.00 MG/L 19 08/94 08/99 <br /> CHLORIDE NOT APPLICABLE 17.80 8.64 27.00 10.00 MG/L 5 11/83 01/87 <br /> SULFATE NOT APPLICABLE 1,115.26 522.13 2,220.00 150.00 MG/L 69 11/83 08/02 <br />PRIMARY ARSENIC DISSOLVED 1.50 1.69 4.00 0.00 UG/L 8 11/83 04/89 <br /> CADMIUM DISSOLVED 0.95 5.82 45.00 0.00 UG/L 63 11/83 08/02 <br /> TOTAL RECOV 1.80 0.00 1.80 1.80 UG/L 1 06/91 06/91 <br /> LEAD DISSOLVED 5.82 26.37 180.00 0.00 UG/L 55 04/87 08/02 <br /> MERCURY DISSOLVED 0.03 0.09 0.60 0.00 UG/L 63 11/83 08/02 <br /> TOTAL RECOV 0.00 0.00 0.00 0.00 UG/L 1 06/91 06/91 <br /> SELENIUM DISSOLVED 0.25 1.11 8.00 0.00 UG/L 63 11/83 08/02 <br /> TOTAL RECOV 1.00 0.00 1.00 L00 UG/L 1 06/91 06/91 <br />SECONDARY SILVER TOTAL RECOV 0.00 0.00 0.00 0.00 UG/L 1 06/91 06/91 <br /> ZINC DISSOLVED 1,137.88 2,729.56 7,850.00 0.00 UG/L 8 11/83 04/89 <br /> TOTAL RECOV 2,460.00 0.00 2,460.00 2,460.00 UG/L I 06/91 06/91 <br /> IRON DISSOLVED 2,542.41 5,247.14 25,000.00 0.00 UG/L 65 11/83 08/02 <br /> TOTAL RECOV 9,320.00 0.00 9,320.00 9,320.00 UG/L 1 06/91 06/91 <br /> MANGANESE DISSOLVED 1,334.11 1,203.64 6,800.00 0.00 UG/L 64 11/83 08/02 <br /> TOTAL RECOV 1,230.00 0.00 1,230.00 1,230.00 UG/L 1 06/91 06/91 <br />TRACE METALS MOLYBDENUM DISSOLVED 0.18 1.35 10.00 0.00 UG/L 55 04/87 08/02 <br /> TOTAL RECOV 0.00 0.00 0.00 0.00 UG/L 1 06/91 06/91 <br />NUTRIENTS NITROGEN AMMIUM-TOTAL 2.46 5.60 36.50 0.00 MG/L 56 04/84 ll/Ol <br /> AMMIA-FREE 0.42 1.12 6.60 0.00 MG/L 56 11/83 08/02 <br /> NITRATE 0.28 1.25 9.34 0.00 MG/L 57 10/66 08/02 <br />TABLE 8p S[TE: 006-AW-2 (FISH CREEK ALLUVIUM) <br />