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• Subsurface Water Monitoring and Anal, Since the initiation ofthe formal ground-water sampling program in January 1982, sub-surface water quality information has been collected from monitor wells at the Keenesburg Mine. The present ground-water monitoring program has provided information which has delineated baseline conditions concerning ground-water movement and quality in the active operations area. The results obtained from data collected in the field and from comprehensive water quality analysis indicate that surface and ground-water quality has not been significantly impacted from the natural pre-mine conditions. In addition, major ground-water movement patterns have not been significantly influenced or interrupted by mining activities. Subsurface water wells are monitored quarterly by Coors Energy Company employees. The six wells monitored are: SMW-2 AMW-1 AMW-2 FPW DH-96 • DH-122 Analysis includes both field and lab work on all wells. During field testing, water level is measured from the top of the casing and recorded prior to water sampling. Water is sampled with a one liter PVC bailer. Five bailer volumes are typically removed before taking the water sample. When the sample is obtained, lab analysis and field analysis bottles transportation to the laboratory. Testing of the field water sample is then completed. The water sample is tested to pH level, electrical conductivity, measured calibrated each quarter at the time of water sampling with a neutral solution of 7.0 pH. The conductivity meter used measures electrical conductivity at the sample temperature which is set automatically by the meter. All the information that is collected during field testing is recorded in a field book which is kept at the Mine office. Immediately following field testing, the lab samples are transported to the laboratory where they are filtered and prepared for analysis. The following are the parameters monitored: • 56