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<br />Annual Hfology Report At] A <br /> Twentymile Coal Com pany <br />Report run on: February 23, 200712:11 PA Page 1 <br />Project: 2000 Foid el Creek Mine Station: 0183107 001-83-107 Classification: WELL <br />Category Parameter Analysis Type Average Std Dev Max Min Count Units Begin End <br />ANIONS BICARBONATE AS HC03 380.68 55.48 439.00 276.00 8 MG/L 08/83 04/98 <br /> CARBONATE AS C03 84.27 56.18 145.00 0.00 6 MG/L 12/87 04/98 <br /> CHLORIDE NOT APPLICABLE 4.00 0.00 4.00 4.00 2 MG/L 08/83 03/84 <br /> HYDROXIDE AS OH -2.00 0.00 -2.00 -2.00 3 MG/L 09/95 04/98 <br /> SULFATE NOT APPLICABLE 243.00 73.77 407.00 160.00 8 MG/L 08/83 04/98 <br />CATIONS CALCIUM DISSOLVED 1.70 0.37 2.00 1.00 8 MG/L 08/83 04/98 <br /> MAGNESIUM DISSOLVED -0.64 0.57 0.30 -1.00 8 MG/L 08/83 04/98 <br /> SAR NOT APPLICABLE 88.73 42.58 154.68 50.28 6 UNDEFINED 12/87 04/98 <br /> SODIUM DISSOLVED 314.63 16.92 333.00 279.00 8 MG/L 08/83 04/98 <br />MEASURED PROPERTIES WATER LEVEL FIELD 6978.96 31.54 6999.79 6895.80 9 FEET (MSL) 01/87 05/91 <br />NUTRIENTS NITROGEN AMMIA-FREE 0.12 0.00 0.12 0.12 1 MG/L 12/87 12/87 <br /> AMMIUM-TOTAL 0.31 0.00 0.31 0.31 1 MG/L 12/87 12/87 <br /> NITRATE 0.01 0.04 0.08 -0.02 6 MG/L 12/87 04/98 <br /> NITRITE -0.01 0.00 -0.01 -0.01 3 MG/L 09/95 04/98 <br /> N03+NO2 0.01 0.04 0.08 -0.02 6 MG/L 12/87 04/98 <br /> PHOSPHATE ORTHO-DISS 0.32 0.05 0.36 0.25 6 MG/L 12/87 04/98 <br />PHYSICAL PROPERTIES ALKALINITY TOTAL 474.83 53.80 533.00 408.00 6 MG/L 12/87 04/98 <br /> CONDUCTIVITY FIELD 1342.50 105.87 1500.00 1120.00 36 UMHOS/CM 03/84 04/03 <br /> LAB 1307.50 29.28 1340.00 1260.00 6 UMHOS/CM 12/87 04/98 <br /> HARDNESS AS CAC03 2.83 2.04 5.00 1.00 6 MG/L 12/87 04/98 <br /> PH FIELD 9.27 0.57 10.40 7.50 36 PH 03/84 04/03 <br /> LAB 9.80 0.00 9.80 9.80 1 PH 04/98 04/08 <br /> SOLIDS TOTAL-DISS 823.25 29.99 874.00 790.00 8 MG/L 08/83 04/98 <br /> TEMPERATURE FIELD 12.26 3.22 23.00 5.00 35 DEGREES C 01/87 04/03 <br />PRIMARY CADMIUM DISSOLVED -0.30 0.22 -0.10 -0.50 6 UG/L 12/87 04/98 <br /> LEAD DISSOLVED -33.33 16.33 -20.00 -60.00 6 UG/L 12/87 04/98 <br /> MERCURY DISSOLVED -0.18 0.04 -0.10 -0.20 6 UG/L 12/87 04/98 <br /> SELENIUM DISSOLVED -1.00 0.00 -1.00 -1.00 6 UG/L 12/87 04/98 <br />SECONDARY IRON DISSOLVED 125.00 187.59 500.00 -20.00 6 UG/L 12/87 04/98 <br /> MANGANESE DISSOLVED -5.50 11.73 12.00 -20.00 6 UG/L 12/87 04/98 <br />TRACE METALS MOLYBDENUM DISSOLVED -26.67 19.66 -10.00 -50.00 6 UG/L 12/87 04/98 <br />tiA