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STATE OF COLCIII IIIIIIIIIIIIIIII <br />DIVISION OF MINERALS AND GEOLOGY <br />Deparlmenr of Natural Resources <br />1313 Sherman 51., Room 215 <br />Denver, Colorado 80203 <br />Phone: (3031 866-3 567 <br />fAX: (3031 832-8106 <br />February 25, 1997 <br />Mr. Jay James <br />TerraMatrix, Inc. <br />1475 Pine Grove Road, Suite 109 <br />Steamboat Springs, CO 80477 <br />~~~ <br />DEPARTMENT OI <br />NATURAL <br />RESOURCE <br />Roy Romer <br />Governor <br />lames S. Lochhead <br />Exec ue ve D"rctor <br />Michael B. Lonl; <br />Division Director <br />RE: 1996 Annual Hydrology Report, Marr Mine, Permit No. C-80-006 <br />Dear Mr. James: <br />The Division has received and reviewed the 1996 Annual Hydrology <br />Report for the Kerr Coal Company. Through our review we have noted <br />a question that may have import on the "probable hydrologic <br />consequences" section of the Marr Mine permit. <br />The question concerns trends in the coal aquifer hydrochemistry. <br />Specifically, a number of key components in solution - calcium, <br />sodium, magnesium, chloride (and concomitantly total dissolved solids <br />and conductance) have displayed a trend of decreasing year-by year <br />until a minimum was reached in 1994. The last two years, these <br />dissolved constituents have increased in the water again. Why do you <br />suppose this is? Do the trends relate to the precipitation amounts? <br />Is the trend consistent with the "probable hydrologic consequences" <br />predicted in the permit application? <br />There may be a similar, although less obvious, trend in the <br />overburden aquifer well 79-1 and 79-2. <br />I appreciate your attention. <br />Sincerely, <br />ames R. Burnell <br />:Environmental Protection Specialist <br />cc: George Patten, Kerr Coal Company <br />M:\oss \l rc\ANR80006 jrb <br />