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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />13t 3 Sherman St., Room 215 <br />DIVISION O F <br />Denver, Colorado 80203 MINERAL 5 <br />Phone: (303) 866-3567 & <br />FAX: (303)832-8106 <br />October 3, 2001 G E O L O G 1f <br /> RECLAMATION <br /> MINING•SAFETY <br />Jim Stover <br />J.E Stover & Asociates <br />2768 Compass Drive, Suite 101 ~o~°~o"' <br />Grand ]unction, Colorado 81506 <br /> Greg E. Watcher <br /> EKetutive Director <br />RE: Roadside North and South Portals Miue Michael 8. long <br />Annual Hydrology Report, Water Year 2000 Dfvi,io~ Director <br />Permit C-1981-041 <br />Deaz Mr. Stover: <br />The Division has completed a review of the 2000 Annual Hydrology Report. We compared results and <br />anlyses presented in the report against predictions contained within the probable hydrologic consequences <br />(PHC) section of the permit. The results presented are in reasonable agreement with PHC projections. <br />Minewater volumes and salinity levels aze within ranges observed in previous years. <br />We noted in reviewing the full suite water analysis results for Discharge 001, that a number of parameter <br />values were dramatically different in 2000 compared to 1999 and previous years, although TDS levels <br />remained within the same range. Sodium level increased, while calcium and magnesium levels decreased <br />(resulting in a significant rise in SAR). Sulfate, potassium, chloride and hardness also decreased <br />significantly. This same pattern was noted in the recently submitted 2001 full suite analyses for Discharge <br />001. [t is possible that these data could reflect true differences in water chemistry associated with the <br />changed source of water which occurred in April, 2000, when the discharge pipe was installed from the No. <br />2 South Mains to Outfall 001. However, it is also possible that sediments suspended in the water could be <br />affecting the results, since total rather than dissolved values are reported for most constituents. To allow <br />for a more complete assessment of the analytical results, we would request that an additional sample of 001 <br />discharge water be submitted for analysis within the next month. Parameters analyzed and reported should <br />include TDS, calcium, chloride, magnesium, potassium, sodium, sulfate, and SAR. Results for the major <br />ions should be reported as both "total" and "total dissolved". It may be appropriate to consider "total <br />dissolved" analyses for major ions and metals in future full suite analyses. <br />Please contact me if you have any questions <br />Sincerely, ~~ <br />Dan .Mathews <br />Environmental Pro ection Specialist <br />cc: Denver File <br />David Berry <br />