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CHIMNEY ROCK COAL MINE <br /> -�TLL W- 5 WATER LEVEL <br /> 6 _ <br /> + i' 1985 <br /> 0 5.5 a - -- <br /> 1986 <br /> 0 5 .........y <br /> ........... . ............ .......................... ............. ............................. --.--_ <br /> m 1987 <br /> 1988 <br /> 4 ......... ........................................... .......................................................... — 3 <br /> 1989 - <br /> Q <br /> 3 <br /> 1 3 5 7 9 11 2 4 6 8 10 12 <br /> MONTH <br />