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Mr. Joe Duda.slt January 5, 1994 Pnge 3 water passing through Pond 003 is not continuous and only occurs when Pond 002B is out of service for cleaning. Mine water has been permitted to pass through Pond 005 which has recently been repaired through the installation of a liner which should limit the seepage of mine water into the alluvium. Additional analysis of monitoring data and the observed effects will be presented in the 1993 Annual Hydrology Report which is due to be submitted by February 28, 1994. G) It has been stated in the Annual Hydrology Reports and in the PHC that mine water discharge from the Golden Eagle may have a localized effect on the groundwater quality in the area of well PAW-6 by an increase in the level of total dissolved solids. It is also projected that the effect on the AVF in this area is minimal because there are no water users or agricultural activities in this localized area. It is not anticipated that the water in well PAW-6 is being effected by the coal refuse pile because any surface water runoff from the pile is contained and routed to Pond 004 which occurs infrequently. Any water which infiltrates the pile would appear as a spring or seep into Ciruela Canyon (as the streambed is located on bedrock) and no such springs or seeps have been observed. H) All NPDES monitoring locations will be added to the "Monitoring Locations" map which wilt be submitted in the 1993 Annual Hydrology Report. Annual Hvdroloev Report Review Issues 1. The mine discharge data presented in Table 3-3 and in the graph are the same data. They both begin in January 1987 and end in December 1992. No changes are necessary as indicated in this comment. Surface Water Monitorine 1. Basin Resources monitors Station CCS-1 on a monthly basis with all other monitoring stations. Sampling occurs during the fourth week of the month and no preference is given to "good weather". If the station is "dry" during these visits, a valid instantaneous measurement is obtained as per the requirements of the monitoring program. No requirement is currently in the permit to obtain "stormwater samples" at this station. 2. During 1992, mine water discharge from Pond 002 experienced some problems meeting effluent limitations. As a result, mine water was routed from Pond 002 to Pond 003 by approval from the Colorado Department of Health. When water is routed to Pond 003, any discharge flows directly into the Purgatoire River and not into Ciruela Canyon where Station CCS-2 is located. This was the case during the period of June through December