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• • III IIIIIIIIIIIII III STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Departmem of Nmural Resources 171 }Sherman SL, Room ? I S Denver, Colornda BO?03 Phone: (3031 866~35G7 FAX: (303) 83'_-810 pp August 27, JA98 ~ % I I r Jerry Koblitz Principal Greystone Development Consultants 5231 South Quebec Street Greenwood Village, CO 801 I I RE: 1998 Annual Hydrology Report, New Elk Mine, #C-81-012 Mr. Koblitz: ~~ DIVISION O F MINERALS~~~~ & ~~ GEOLOGY REC LAM ATIO N` MINING•SAFETY all Owens Governor Greg E. lW lcher fxecwive Director Michael a. Long Diviswn Director The Division of Minerals and Geology has completed review of the 1998 Annual Hydrology Report for the New Elk Mine, #C-81-012. General Comments The map included with the report is nearly unusable given its poor condition and the amount of overplotting. Please include a new map with future reports, which accurarely depicts site locations. Passible options include using Map 136 as a base or developing a new AutoCAU map. Orientation to existing surface features should aid in accurately locating each site. In particular, stream sites are not clearly defined or located. Update of the text descriptions should coincide with any revision of the map. PAW-1 and PAW 2 are not 100 yards apart but are in fact only 30 feet apart. The Division notes Table 1.2-3 of the 1998 report which includes [he elevations, total depth, zone of completion, and monitoring purpose for all New Elk wells. This information complies with Rule d.05.13(1)(d)(i). Monitorine Frequency Site visits and samples appear to have been taken in accordance with the approved plan. Analv'sis of Data and Determination of Impacts Surface Water Quantity and Quality Two stations on the Purgatoire River are monitored for Flow and field parameters on a quarterly basis, and water quality on an annual basis. PRS-I is located upstream of all New Elk mining activities and PRS-4 is located downstream of all mining activities, yet upstream of the confluence of the North Fork of the Purgatoire with the Middle Fork. No consistent relationship between Flows is apparent. In fact, Flow values are inconsistent depending on [he month. No apparent relationship benveen the two sites could be established for low Flow or for the irrigation season. Conductivity is nearly equal at the two sites, PRS-I (287 umltos/cm) vs. PRS-4 (293 umhos/cm). Pond discharges were very infrequent and of short duration. Pond efFluent, when i[ occurs, is monitored through self reporting and sampling in accordance with the approved point source discharge petntit issued through the Colorado Department of Public Health and the Environment. Repairs [o principal spillways in pond ?and pond 7 should improve pond efFluent and prevent the occasional exceedance of efFluent limitations. Ground Water Ouantiry and Ouali[y