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TABLE: 11 COLORADO YAMPA COAL COMPANY: MINE 1, 2 AND ECKMAN PARK MINE 1999 ANNUAL HYDROLOGY REPORT WATER QUALITY MONITORING DATA SITE: O6AY1 (We11006-AY-1) DATUM = 6827.99 CATEGORY PARAMETER ANALYSIS TYPE UNITS OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP FIELD MEASURES DATE 10/19/98 11/10/98 12/8/98 1/19/99 2/24/991 3/18/99 4/15/99 5/6/99 6/21/99 7/28/99 8/20/99 9/22/99 WATER ELEVATION FT 6820.53 6820.56 6820.35 6820 2 6820.32 6820.8 6821.3 6821.67 6820.15 6819.68 6820.03 6820.1 WATER LEVEL FT 7.46 7.43 764 _7.79 7.67' 7.19 6 69 6.32 7.84 8.31 7.96 7 89 PHYSICAL PROPERTIES TEMPERATURE FIELD DEGREES C 12.2 8.9 10.4 6 8 6.5 5.2 5.7 5.9 8 6 9 2 10.3 9.4 CONDUCTIVITY FIELD UMHOSlCM 900 850 840 720 670 650 890 1060 1040 980 870 850 LAB UMHOS/CM 729 I 683 1090 765 _ PH FIELD PH 7.41 7 57 7.78 8.2 8.15 8 48 8 32 8.24 6.19 7.69 7.85 7.78 LAB PH 7.3 7.3 7.6 7.2 ALKALINITY TOTAL MG/L 262 240 236 251 HARDNESS AS CAC03 MG/L 398 310 507 400 SOLIDS TOTAL-DISS MG/L 480 420 780 640 _ CATIONS CALCIUM DISSOLVED MG/L 63.9 659 107 86.1 MAGNESIUM _ DISSOLVED MG/L 45.8 35.3 58.2 45 SODIUM DISSOLVED MG/L 33.8 27.8 33.7 26.3 __ SAR NOT APPLICABLE UNDEFINED 0.74 0.69 065 0.57 ANIONS BICARBONATE AS HC03 MG/L 320 292 288 306 _ CARBONATE AS C03 MG/L < 2 i < 2 < 2 < 2 HYDROXIDE AS OH MG/L < 2 _ < 2 _ < 2 < 2 SULFATE NOT APPLICABLE MG/L 190 130 390 200 PRIMARY CADMIUM DISSOLVED UG/L <.5 <,5 <.5 <.5 LEAD DISSOLVED UG/L _ <40 _ <40 <40 ~ <40 MERCURY DISSOLVED UG/L <.2 <,2 <.2 <.2 SELENIUM DISSOLVED UG/L <1 1 2 ___ 2 SECONDARY IRON DISSOLVED UGIL 100 200 _ 550 140 MANGANESE DISSOLVED UG/L 822 212 787 757 TRACE METALS MOLYBDENUM DISSOLVED UG/L < 10 < 10 < 10 _ < 10 NUTRIENTS NITROGEN AMMIUM-TOTAL MG/L 026 <.01 <.01 < 01 AMMIA-FREE MG/L <.01 0.11 0.1 <.O5 NITRATE MG/L <.02 <.02 0.03 0.03 NITRITE MG/L 0.04 x- 0.04 <.01 < 01 N03+N02 MG/L <.02 0.03 0.03 0.03 PHOSPHATE ORTHO-DISS MG/L 0.078 0.009 0_014 <,005 _ I ~EN~ENVIRONMENTALNMR\I99TLYCC~TABLE51B91YNIS ~b 13 09 PM ~ B/1SD0