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• For all wells, water levels will be measured using a standard measuring probe before pumping or bailing of the well. Water level measurements will be made relative to a consistent datum, such as the top of the casing. Pumping or bailing of the wells will be done to ensure that water standing in the well bore is removed; thus, representative field readings and water quality samples can be obtained. Surface Water, Effluent, and Spoil Spring Monitoring Surface water monitoring will be conducted to address the quantity and quality of area stream flows, the discharge from sedimentation control ponds, and quantity and quality of spoil springs. Surface water will be monitored in the mine plan and adjacent areas using the sites listed in Table A, Hydrologic Monitoring Sites, and as described within the NPDES Permits CO-0027154 and CO-0036021. All of the specified sites are denoted on Map 4b, Hydrologic Monitoring Program. Along Foidel and Middle Creeks, the USGS has established two continuous • stream flow monitoring stations. Station 09243900 is located along Foidel Creek while Station 09243100 is located on Middle Creek. Both stations are located upstream of Mine 3. The operation and maintenance of the USGS stations is planned to continue throughout the life of the mine. Sampling of the stream sites will be performed an a flexible schedule during the normal flow period, March through September. Within this time frame, most of the sites will be measured twelve (12) times for flow and field parameters and four (4) full suite analyses will be conducted. Measurements for flow and field parameters will be collected per the following schedule, field conditions permitting: March - Monthly April - Two times during the month May - Monthly June - Monthly July - Monthly August - Weekly ~ September - First two weeks of the month MR 90-10 Ex. 15-3 Revised 05/03/90