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i i i i i i i i i i i i i iii i i i l Subsurface Water Monitoring end Analveie \J Since the initiation of the formal ground-water sampling program in January 1982, sub-surface water quality information hoe been collected from monitor wells at the Keenesburg Mine. The present ground-water monitoring program has provided information rhich hoe 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 end ground-rater quality has not been significantly impacted from the natural pre-mine conditions. In addition, me~or ground-water movement patterns have not been significantly influenced or interrupted by mining activities. Subsurface rater cells are monitored quarterly by Coors Energy Company employees. The six cells monitored area SMW-2 AMW-1 AMW-2 FPW • DH-96 DH-122 Analysis includes both field and lab rock on all relle.(See AMW-2 update, this section, Pege 60) During field testing, rater level is measured from the top of the casing and recorded prior to rater sampling. Water is sampled rith a one liter PVC bailer. Five bailer volumes are typically removed before taking the water sample. When the sample ie obtained, lab analysis and field analysis bottles transportation to the laboratory. Testing of the field rater sample is then completed. The rater sample is tested to pH level, electriaal conductivity, measured calibrated each quarter at the time of rater sampling rith a neutral solution of 7.0 pH. The conductivity meter used measures electrical conductivity et the sample temperature rhich is set automatically by the meter. All the information that is collected during field testing is recorded in a field book rhich is kept at the Mine office. • -56- 4/93