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iii iiiiiiiiniii iii • • STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Department of Nalurdl Resources 1 } I J Sherman St., Room 215 Denver, Color. do 80203 Phone: I}03) 8hh-}567 FAR: p031 e}2~8106 April 30, 1999 Ron Thompson Property Manager Basin Resources, Inc. 14300 Highway 12 Weston, CO 81091 RE: 1998 Annual Hydrology Report, Golden Eagle Mine, #C-81-013 Mr. Thompson: DIVISION O F MINERALS GEOLOGY RECLAMATION MIN ING•$AFETY Bill Owens Governor C~eg E. watcher Eaecubve D~reoor Michael B. fang 66v Jion Director The Division has completed review of the 1998 Annual Hydrology Report (AHR) for the Golden Eagle Mine. Monitoring Frequency All samples and site visits were conducted as required. Two general observations were noted. First, Exhibit 1 was included and is a map of the monitoring site locations. This exhibit is not accurate or complete. Possibly, a better alternative for future reports is to reference the two maps in the approved permit, which accurately depict all monitoring stations. Second, temperature values have been recorded as Fahrenheit and Celsius. Please add a footnote in future reporting which clearly notes the discrepancy. Surface Water Quantity and Quality Two stations on the Purgatoire River are monitored for flow and field parameters on a quarterly basis, and a lab sample is analyzed on an annual basis. PRS-2 is located upstream of all Golden Eagle mining activities and PRS-3 is located downstream of all mining activities. One water sample was conducted at each of these locations, in accordance with the annual sample list on page 2.05-47d, Table 23 of the permit. Flow is slightly higher (9%) at the downstream site and water quality with regard to salinity is slightly higher, with EC values recorded of 198 umhos/cm and 214 umhos/cm from upstream to downstream. Overall water quality is acceptable according to the standards for all uses.