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Ill l 1111 Il 111111~I <br />STATE OF COLORADO <br />MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />303 866-3567 <br />FA x: 303 832 8106 <br />pF COO <br />~~ ~9 <br />~~ ~g <br />•~~pn• <br />~ re76 ~ <br />Roy Romer, <br />Governor <br />Fretl R. Hansa, <br />DATE: January 25, 1990 Division Oireclor <br />T0: Hydrology File, Canadian Strip, C-81-026 <br />FROtA: Cathy Begej (tC~fny ~~ <br />RE: Groundwater Montitoring Data <br />Wyoming Fuels monitors five wells at the Canadian Strip Mine. One is a spoils <br />well on the north end of the property and four are bedrock wells south - <br />southeast of Pit 1, The four bedrock wells include two underburden wells, one <br />coal well and one overburden well. <br />The spoils well is one hundred-and-ten feet deep and has approximately ten <br />feet of water in it. Water levels went up in 1988, but have dropped to their <br />historical levels. It is an alkaline sodium bicarbonate water with total <br />dissolved solids levels running approximately 1000 mg/1. <br />The two underburden wells exhibit totally different chemistrys. Well 1 is a <br />sodium sulfate water with a TDS of 2000 mg/1, while well iC is a sodium <br />bicarbonate water with a TDS of 948 mg/1. I reviewed the baseline data from <br />the other three overburden wells at the site to see if there were any clues <br />aboutthis discrepancy. The other three wells exhibited a sodium bicarbonate <br />chemistry, with total dissolved solids levels ranging from 830 mg/1 to 3200 <br />mg/1, The salinity did not appear to be affected by depth below the coal or <br />distance from Pit 1. The underburden wells did display substantial heads, <br />ranging from 180' to potentially 585' above the perforated interval. The last <br />statement is qualified as the perforated interval on wells 1 and 1C are not <br />known. However, head appears to increase as the depth below the coal <br />increases. <br /> Comparison of Depth of Perforated Interval and <br /> Hydraulic Hea ds on Canadian Underburden Wells <br /> Distance Between Distance Between Average Head Above <br /> Perforated Interval Bottom of Coal and Center of Perforated <br />Well and Overlying Coal Bottom of Well Interval <br /> <br />6A (-14' - 36' - 177' <br />5A 24' - 64' - 180' <br />4A 36' - 76' - 300' <br />1C N/A 82' 480' <br />1 N/A 118.5' 585' <br />