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RIDER TO MINING PERMIT Permit Date: November 20, 1987 Permit No: C-87-072 The following additional stipulations and conditions form an integral part of the foregoing permit: Stipulation No. 1 The permit application document must be updated to reflect all changes and agreements reached during the review process within five (5) days of this decision becoming final. Stipulation No. 2 La Plata Coal Corporation will complete a well within the Hay Gulch alluvium within ten (10) feet, measured horizontally, downgradient from the outslope of the sediment pond within thirty (30) days of permit issuance. This well will be of adequate diameter and depth to provide water quality and depth-to-water information. Depth-to-water information will be obtained, at a minimum, on a quarterly basis. Water will be sampled semi-annually and analyzed for the parameters listed in Table I. Reports will be submitted annually to MLRD. Stipulation No. 3 La Plata Coal Corporation will complete a well (separate of the well addressed in Stipulation No. 2) within the Hay Gulch alluvium within ten (10) feet, measured horizontally, downgradient for the edge of the proposed leach field within thirty (30) days of permit issuance. This well will be of adequate diameter & depth to provide depth-to-water info. Depth-to-water info will be, at a minimum, semi-annually. Monitoring will be conducted during spring snowmelt/runoff(Sept./Oct.). Reports will be submitted w/in 30 days of monitoring. Stipulation No. 4 La Plata Coal Corporation will submit a plan to the Division addressing treatment of acidic drainage at the mine site within five (5) days of permit issuance. The plan is to be implemented within thirty (30) days of Division approval. Prior to receiving Division approval of the treatment plan, La Plata Coal Corporation will take all appropriate measures to ensure that the pH of offsite discharges are between pH 6 and 9.