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<br />2. The data from the 1992 sampling and measurements fall within <br />the historical range of data from the same well locations. <br />Comments• <br />However, well OW-14's magnesium and nitrate levels are exceeding <br />the Department of Health's recommended material damage suspect <br />criteria list. These levels have been in exceedence since 1985, <br />but do not show an increasing trend over time. on October 1992 <br />full suite's analysis, nitrate levels reached acceptable levels for <br />the first time. Magnesium levels also showed a slow down and <br />stabalization since 1987. Since the mine has been inactive since <br />1985-1986 when the rock tunnel excavation ceased, these high levels <br />of Mg and NO3 are due to geologic conditions, illustrated in <br />baseline studies of the area and are not due to mining operations. <br />There has been no coal mined on the Coal Ridge No.l Mine site to <br />date. <br />3. The data from the 1990 sampling and measurements are within <br />the projections of the Probable Hydrologic Consequences (PHC) for <br />the mine. <br />Conclusion• <br />This concludes my review of the 1992 Annual Hydrology Report <br />submitted for the Coal Ridge No.l Mine. <br />cc: Larry Routten <br />