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' GROUND WATER QUALITY PARAMETERS ' SITE GW-N14 FORMATION DAKOTA COAL DATE OF COLLECTION 08!02!95 05/24!95 02!16!95 08!30/94 FIELD PARAMETERS Conductivity (UMHOS/CM) 3980 4050 3900 3270 ' pH 4.6 4.6 4.1 4.5 Water Temperature (DEG C) 19.0 ' LABORATORY PARAMETERS ACIDITY, DISS. (mg/I OF CACO3) 251 195 208 ' ALKALINITY, DISS. (mg/I OF CACO3) 0 ALUMINUM, DISS. (mgA) 16.9 19.1 18.4 13.3 ARSENIC, DISS. (mg/I)' -1 BARIUM, DISS. (mgA)' 0.006 0.005 0.004 -0.01 BERYLLIUM, DISS. (mg/I) 0.05 0.051 0.047 0.042 BICARBONATE, DISS. (mg/I) 0 ' BORON, DISS. (mg/I)' CADMIUM, DISS. (mg/l)` 0.45 0.46 0.43 0.004 0.35 -0.005 CALCIUM, DISS. (mg/I) 448 452 436 438 CARBONATE, DISS. (mgA) 0 CATION/ANION BALANCE (%) 5.1 1.7 -0.2 -5.24 CHLORIDE, DISS. (mg/I) 15 11 10 11 COBALT, DISS. (mg/I) 0.12 0.12' 0.11 0.1 CONDUCTIVITY @ 25 DEG C (UMHOSlCM) 3980 4050 3900 3900 ' COPPER, DISS. (mg/I)• -10 FLUORIDE, DISS. (mg/I) 11 6 5 2.7 HARDNESS AS CACO3 (mg/I) 2560 2600 2570 2522 IRON, DISS. (mg/I) 45.5 45.3 36.5 IRON, TOTAL (mg/I) 46 47.2 43.5 LEAD, DISS. (mg/I)' -20 LITHIUM, DISS. (mg/I) 0.89 1.63 0.8 MAGNESIUM, DISS. (mg/I) 350 357 348 MANGANESE, DISS. (mgA) 4.96 4.57 4.29 ' MANGANESE, TOTAL (mg/I) 4.73 4.87 4.9 MERCURY, DISS. (mg/I)' -0.2 MOLYBDENUM, DISS. (mg/I)• 2 NICKEL, DISS. (mg/l)' 180 NITROGEN, AMMONIA, DISS. (mg/I) 1.33 1.37 1.52 1.47 NITROGEN, NITRATE, DISS. (mgA) 0.09 0.08 -0.02 NITROGEN, NITRITE, DISS. (mg/I) 0.09 0.03 -0.01 PH @ 25 DEG C 4.6 4.6 4.1 3.8 PHOSPHATE AS PO4, DISS. (mgA) 0.33 0.02 -0.1 POTASSIUM, DISS. (mgA) 15 14.9 16 ' SELENIUM, DISS. (mg/I)` -1 SODIUM, DISS. (mg/I) 60 62.6 60 SODIUM ADSORPTION RATIO 0.52 0.54 0.56 0.53 ' SULFATE, DISS. (mg/I) 2700 2900 3000 3066 SULFIDE, TOTAL (mg/1) TOTAL DISSOLVED SOLIDS @ 180 DEG (mg/I) 1.18 4160 4166 TOTAL DISSOLVED SOLIDS, CALCULATED (mgA) 3670 3870 4243.2 3923 I TOTAL SUSPENDED SOLIDS (mgA) 12 VANADIUM, DISS. (mg/I) -0.1 ZINC, DISS. (mg/l)• 0.49 0.52 450