1997-11-13_REVISION - M1977493 (50)

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=Environmental Titan Environmental Corporation • September 3, 1997 7939 E.Arapahoe Rd., Suite 230 Englewood, Colorado 80112 Phone: (303)850-9852 Mr. Bryce Romig Fax: (303) 850-9910 Environmental Coordinator Climax Molybdenum Company Highway 91 Climax, CO 80249 Dear Mr. Romig: As We recently discussed, the Eagle Park Reservoir Post Reclamation Surface Water Sampling Investigation will be complete by the end of September 1997. This letter summarizes the sampling events conducted in 1997 to date, as well as the analytical data provided by the sampling events. In general, the sampling and analysis investigation closely followed the schedule and procedures outlined in the "Sampling and Analysis Plan, Eagle Park Reservoir, Post Reclamation Sampling" (Titan Environmental Corporation, 1996) and the objectives of the plan were met. In smmary, data generated from the sampling events are as expected with higher analyte concentrations indicated in the first several sampling events and concentrations decreasing throughout the sampling investigation. Analytes which were initially higher than applicable • stream water quality standards were iron, manganese, nitrogen, sulfate and pH. The higher concentrations for these analytes occurred during the first several sampling events, however, concentrations have consistently decreased throughout the sampling investigation to below stream water quality standards for all analytes. For the past three sampling events (June 26, July 10 a0d July 25) all analytes have been below water quality standards for Segment 3 of the East Fork of the Eagle River. Surface Water Investigation The primary objective of the post reclamation surface water investigation was to demonstrate that the reservoir water quality is suitable for discharge into the East Fork of the Eagle River usins the "Colorado Department of Health Water Quality Control Commission, Classifications and ':Numeric Standards for Upper Colorado River Basin and North Platte River (Planning Regioon 12)", (Colorado Department of Health Water Quality Control Commission, 1994) as targOt water quality goals. These objectives were met. Sure water sampling commenced in March 1997 and is anticipated to be complete by the end of September 1997. A total of 10 surface water sampling events in 1997 have taken place to date and events are scheduled to take place in August and September 1997. This will result in a total of approximately 52 surface water samples for analysis. To date, 40 surface water samples have been collected and analyzed. All analyses have been performed by ACZ Laboratories according to EPA CLP protocol. A review of the quality control and quality assurance data indicates the data meet CLP quality.