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1600 <br />1500 <br />1400 <br />A <br />1300 <br />S <br />U 1200 <br />L <br />F <br />A 1100 <br />T <br />E <br />1000 <br />900 <br />800 <br />700 <br />600 <br />500 <br />M <br />G <br />400 <br />L <br />300 <br /> A <br /> A A <br /> A A <br />A <br /> A <br /> <br />A A <br />A A <br />200 + A <br />I <br />I <br />100 + A A A A <br />I <br />I A <br />0 + <br />14J UL1980 30J AN1981 18AUG1981 06MAR1982 225EP1982 l0APR1983 270CT1983 14MAY1984 30NOV1984 18JUN1985 04JAN1986 23JUL1986 <br />SAMPLE DATE <br />Figure 4. Plot of sulfate concentration versus time for surface water monitoring site SW-S2-6, <br />Seneca II Mine, Routt County, Colorado. <br />J <br />