2008-04-01_REPORT - C1981044 (5)

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Annual ' ' rology Report ~~ ~ 2 ~ TweniCoal Co mpany Report run on: March 29, 2007 8:47 Ati Page 1 Project: 2003 Williams Fork Mine Sfation: A V6 AVF-6 C/assification: .WELL Category Parameter Analysis Type Average Std Dev Max Min Couni Units Begin End ANIONS BICARBONATE AS HC03 674.23 137.69 1100.00 406.00 79 MG/L 06/81 05/06 CARBONATE AS CAC03 -2.00 0.00 -2.00 -2.00 7 MG/L 03/96 09/97 AS C03 2.41 10.93 60.00 -2.00 37 MG/L 12/81 05/06 CHLORIDE NOT APPLICABLE an ~,~ ~ o n~ ~~ .,~ ----- ~~•~~ o~.vv iu.vv 79 ivlG/L 06%231 05%06 HYDROXIDE AS CAC03 -2.00 0.00 -2.00 -2.00 7 MG/L 03/96 09/97 AS OH -1..13 1.01 0.00 -2.00 23 MG/L 08/91 09/99 SULFATE NOT APPLICABLE 379.91 178.77 759.00 10.00 79 MG/L 06/81 05/06 CATIONS CALCIUM DISSOLVED 137.82 46.89 234.00 30.30 72 MG/L 03/83 05/06 TOTAL RECOV 64.29 30.17 107.00 29.00 7 MG/L 06/81 12/82 MAGNESIUM DISSOLVED 75.27 23.21 123.00 19.50 72 MG/L 03/83 05/06 TOTAL RECOV 46.14 19.85 85.00 24.00 7 MG/L 06/81 12/82 POTASSIUM DISSOLVED 3.75 2.46 7.40 2.10 4 MG/L 03/83 12/83 TOTAL RECOV 3.11 1.31 6.00 2.30 7 MG/L 06/81 12/82 SAR NOT APPLICABLE 2.62 0.97 6.23 1.02 58 UNDEFINED 06/81 07/96 SODIUM DISSOLVED 167.73 81.14 451.00 83.80 72 MG/L 03/83 05/06 TOTAL RECOV 169.57 71.59 290.00 48.00 7 MG/L 06/81 12/82 MEASURED PROPERTIES WATER LEVEL FIELD 6140.48 1.31 6145.13 6137.73 66 FEET (MSL) 01/84 10/91 MINOR FLUORIDE NOT APPLICABLE 0.46 1.09 7.00 0.09 46 MG/L 06/81 08/94 NUTRIENTS NITROGEN NITRATE 0.02 0.09 0.50 -0.02 68 MG/L 03/84 05/06 NITRITE -0.01 0.01 0.02 -0.02 26 MG/L 12/86 09/99 N03+N02 0.02 0.08 0.37 -0.02 60 MG/L 06/81 09/99 PHYSICAL PROPERT-ES ACIDITY AS CAC03 0.00 0.00 0.00 0 00 4 MG/L . 06/84 03/85 ALKALINITY TOTAL 578.38 114.54 917.00 340.00 73 MG/L 06/81 05/06 CONDUCTIVITY FIELD 1606.21 239:24 3000.00 730.00 130 UMHOS/CM 01/82 06/01 LAB 1609.37 294.62 2230.00 955.00 79 UMHOS/CM 06/81 05/06 HARDNESS ~ AS CAC03 632.21 188.41 943.00 0.00 48 MG/L 06/81 03/97 TOTAL 732.00 0.00 732.00 732.00 1 MG/L 03/92 03/92 OIL&GREASE VISIBLE NOT APPLICABLE 2.00 0.00 2.00 2.00 10 UNDEFINED 03/93 12/96 PH FIELD 7.38 0.26 8.22 6.80 130 PH 01/82 06/01 LAB. 7.65 0.29 8.60 6.80 78. PH 06/81 05/06 SOLIDS SUSPENDED 30.60 37.24 90.00 -5.00 5 MG/L 06/84 03/96 TOTAL-DISS 1188.62 270.36 1708.00 640.00 47 MG/L 06/81 03/96 TEMPERATURE FIELD 10.26 3.54 23.10 4.00 126 DEGREES C 05/82 06/01 PRIMARY ARSENIC DISSOLVED -1.74 6.68 5.00 -40.00 72 UG/L 03/83 05/06 TOTAL RECOV 2.57 5.09 12.00 -2.00 7 UG/L 06/81 12/82