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raeLE: zs COLORADO YAMPA COAL COMPANY: MINE NO. 1, 2 AND ECKMAN PARK 1999 ANNUAL HYDROLOGY REPORT WATER QUALITY MONITORING DATA SITE: 700 (MIDDLE CREEK 09243700) DATUM= 6730 Field MAR APR MAY (2) JUN JUL AUG (2) (3) (4) SEP (2) Parameters 19-Mar-99 15-Apr-99 6-May-99 24-Ma -99 21-Jun-99 28-Jul-99 03-Au -99 09-Aug-99 16-Aug-99 23-Aug-99 07-Sep-99 20-Sep-99 Water Level -0.74 -1.18 -1.73 -1.50 -1.09 -0.50 -0.48 -1.00 -0.97 -1.02 -0.39 -0.48 Flow (ds) 3.6 6.1 25 12 3.5 1.2 0.82 3.4 3.3 3.9 0.47 0.61 TEMPERATURE FIELD DEGREES C 2.1 6 5.4 18 21 22 24 20 19 19 17.60 12.80 CONDUCTIVITY FIELD UMHOS/CM 820 650 590 540 550 680 780 430 410 390 690 980 PH FIELD PH 7,91 8.58 8.22 8.37 8.51 6.36 8.46 8.6 6.59 8.5 8.26 8.49 Lab Parameters CONDUCTIVITY LAB UMHOSICM 628 557 391 865 PH LAB PH 8.1 8.5 8.3 8.2 SOLIDS TOTAL-DISS MGlL 470 360 240 590 SOLIDS SUSPENDED MG/L 204 50 40 10 ALKALINITY TOTAL MGIL 169 192 149 246 HARDNESS TOTAL MGlL 348 255 185 421 CALCIUM DISSOLVED MGIL 81.8 58.3 43.4 96.6 MAGNESIUM DISSOLVED MGIL 34.8 26.7 18.6 43.6 SODIUM DISSOLVED MG/L 24.2 17.8 13.1 48.5 SAR NOT APPLICABLE UNDEFINED 0.57 0.49 0.42 1.04 SULFATE NOT APPLICABLE MG/L 180 100 60 240 BICARBONATE AS HCO3 MG/L 230 211 175 300 CARBONATE AS CO3 MGIL -2 11 3 -2 HYDROXIDE AS OH MG/L -2 -2 -2 -2 CADMIUM TOTAL RECOV UG/L -0.5 -0.5 -0.5 -0.5 MERCURY TOTAL RECOV UGIL -0.2 -0.2 -0.2 -0.2 SELENIUM TOTAL RECOV UG/L -1 -1 -1 1 SILVER TOTAL RECOV UG/L -0.5 -0.5 -0.5 -0.5 ZINC TOTAL RECOV UGIL 40 10 20 -10 IRON TOTAL RECOV UG/L 6840 2210 1790 230 MANGANESE TOTAL RECOV UG/L 356 107 73 BB MOLYBDENUM TOTAL RECOV UG/L -10 -10 -10 -10 NITROGEN AMMIUM-TOTAL MG/L -0.01 -0.01 -0.01 -0.01 NITROGEN AMMIA-FREE MG/L 0.08 -0.OS -0.OS -0.05 NITROGEN NITRATE MG/L 0.28 0.02 0.02 -0.02 NITROGEN NITRITE MG/L -0.01 0.01 0.01 -0.01 NITROGEN NO3+NO2 MG/L 0.28 0.03 0.03 -0.02 PHOSPHATE ORTHO-DISS MGIL 0.022 0.056 0.023 0018 PHOSPHATE NOT APPLICABLE MGIL 0.06 0.17 0.07 0.05 i.~tNVmoHmrxr~uwai~is9arnc~rneuEt~suae.ui.s xts