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HG COAL COMPANY GROUND WATER MONITORING WELL HG-2 SAMPLE DATE AG diss mg/I AL diss mg/I AL tot mg/I AL ALK tot rec as CaC03 mg/I mq/I AS dins mg/I AS tot rec mg/I B diss mg/I B tot mg/I BICARB as CaC03 mg/I CARB as CaC03 mg/I CA diss mg/I CD diss mg/I CD tot mg/I CD tot rec mg/I CL mg/I COND @ 25C umohs CR CR CR hexavalent trivalent tot rec mg/I mg/I mg/I CU diss _ mg/I 11/05/87 5.74 414 0.04 414 0 171 -0.005 03/28/86 25.6(s) 346 0.03 346 0 141 -0.005 1020 06/26/86 0.31 418 0.05 418 0 170 -0.005 1340 08/11/86 0.34 430 0.02 430 0 212 0.017 1300 10/10/88 0.4 416 0.03 416 0 209 0.029 1220 10/25/68 0.52 404 ~ 0.05 404 0 204 -0.005 1240 08/07/89 0.52 408 0.04 408 0 186 -0.005 1470 10!05!89 412 412 0 63 1190 06/15/90 -0.05 415 0.05 415 0 177 0.02 1460 09/20/90 -0.05 410 0.06 410 0 221 -0.005 1320 06/03/91 -0.05 416 0.06 416 0 199 -0.005 1180 10/11/91 -0.05 432 0.05 432 0 177 -0.005 1360 05/14/92 -0.05 406 0.06 406 0 186 -0.005 1200 09/03/92 -0.05 356 0.06 358 0 112 -0.005 985 06/10/93 -0.05 442 0.04 442 0 -0.005 1110 08/30/93 -0.05 448 0.04 448 0 166 -0.005 1400 05/05/94 -0.05 432 0.05 432 0 143 -0.005 1319 09/06/94 -0.05 422 0.06 422 0 196 1328 06/27/95 -0.03 423 0.05 423 -2 173 1300 10/11195 -0.03 360 0.04 360 -2 181 1300 06/20/96 -0.005 432 -0.001 0.04 432 -2 165 -0.003 7 1152 -0.005 -0.01 -0.01 -0.01 11/19196 -0.005 449 0.001 0.04 449 -2 186 -0.003 7 1176 -0.005 -0.01 -0.01 06/19/97 -0.005 2 451 0.001 0.04 0.1 451 -2 147 -0.003 8 1040 -0.005 -0.01 10/15/97 -0.005 -0.03 3 438 -0.001 0.05 0.01 438 -2 205 -0.003 10 1260 -0.005 0.01 07/14/98 -0.005 -0.03 0.42 417 -0.001 0.03 0.04 417 -2 149 -0.003 7 1100 -0.005 -0.01 -0.01 NUMBER 5 2 22 0 25 3 2 5 22 25 25 24 5 16 0 5 24 5 2 2 5 MINIMUM -0.005 -0.03 -0.05 346 -0.001 -0.001 0.03 0.01 346 -2 63 -0.003 -0.005 7 985 -0.005 -0.01 -0.01 -0.01 MAXIMUM -0.005 -0.03 5.74 451 0.001 0.001 0.05 0.1 451 0 221 -0.003 0.029 10 1470 -0.005 -0.01 -0.01 0.01 MEAN 0.0025 0.015 0.64 416 0.0007 0.0008 0.040 0.05 416 0.3 172 0.0015 O.OD6 7.6 1240 D.0025 0.005 0.005 0,006 STD DEV 0 0 1.35 26 0.0002 0.0003 0.006 0.02 26 0.4 34 2E-11 0.008 1.2 128 0 0 0 0,002 #<DL 5 2 12 0 0 2 1 0 0 0 7 0 5 13 0 0 0 5 2 2 4 Notes: Blank value indicates analysis not performed for that parameter. "-"indicates result below laboratory detection limit. 1l2 the detection limit is used for the purpose of calculating mean and standard deviation. (s) indicates result determined to be anamalous and is not included in the calculation of the summary statistics Ftla' 985TATS.x/5, flHQ98 Pape 1 0/3