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J I~~ I~II~~I~IIIII I~I STATE OF COLORP~L~U DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 1313 Sherman 51.. Room '_IS Denver, CO tlS03 Phone ;507; Bhb~ 5567 FAS: 13031 N}~-81 U6 March 22, 1993 TO: File ,t. FM: ehawn 8mith`;~'~ Re: 1992 Annual Hydrology Report Coal Ridqe No.i Mine (C-84-065) Dear File: pF Cpl ti~ 4 rte 'O ry .~ .•,*~~• ~ rB ]6 Rov Romer Governor Michael B. Long Div is ion Director I have reviewed the following documents in the process of preparing the annual hydrology report for 1993: Permit sections on hydrology Permit sections on geology Probable Hydrological Consequences Findings Document 11/92 1990 Annual Hydrology Report 1991 Annual Hydrology Report 1. The mine has complied with Rule 4.05.13, and are within their permitted monitoring plan and Stipulation No.3 in parameters monitored with the exception of the fourth quarter. Due to winter snow conditions, the winter monitoring of the ground water wells was not made this year. The winter quarter results were received 3/22/93 by the Division for sampling done on February 23, 1993 by Resource Engineering Inc. The annual full suite analysis was in the 3rd quarter, October of 1992. The winter quarter was for a partial measurement of pH, temperature, EC and depth to water only. All parameters measured and reported on 3/22/93 were within expected range. Ground water wells OW-31, 7, 8, 12, 13, 14, 15 and loadout well LO- 1 were all sampled in 1992 according to Stipulation 3 requirements. Ground water wells No.s OW-3L, 7, 12, 13 and 15 all remained dry for the monitoring year. OW-4L was replaced by OW-15 in March of 1992 per Minor Revision 10. Comments Ground water well, OW-14 was not measured for the C03 anion, nor it seems at any time since 1986, although this is required per Stipulation No.3 as a parameter to be annually sampled. Previous reports indicate that this parameter has never been calculated.