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The embankment was constructed to be stable and provide adequate freeboard. Therefore, <br />based on the design, [his structure complies with the appropriate regulations for a • <br />sedimentation structure. A toe drain and horizontal drainage system was constructed to <br />collect any seepage and discharge below the embankment. Seneca Coal Company will <br />periodically inspect the structure for sediment storage, structural integrity, and <br />hazardous conditions. Maintenance and remedial work will be performed in accordance with <br />the approved mine permit. <br />Construction Summary <br />In accordance with Rule 4, Part 4.05.6f101 of [he Rules and Requlatlons of the Colorado <br />Ml reed Land Reclamation Board pursuant to the Colorado Surface Coal Mining Reclamation Act <br />39-33-LO1 et seq., I Michael G. Altavill a, hereby certify that the construction of <br />Sedimentation Pond 010 was Snspected and constructed under my supervision. The <br />construction of Pond 010 was supervised on site by Chuck McCUlloh, Senior Englneer- <br />Operations, at the Yoast Mine. Chuck assured all work was performed in accordance xith <br />the design and the specifications. I Snspected the structure dally during Sta <br />construction, with the exception of July 27 to August 5, 1996, when I was on vacation, to <br />ve rlfy the pod's conditions dur!nq construction and upon completion for the as-built. <br />Our geotechnical consul[an [, Northwest Colorado Consultants, Inc. was here daily to do <br />compaction testing, soil analysis, etc. Mr. Brian D. Len, P.E., was also on the site on <br />three separate occasions during the construction of the pond, as well. Their summary <br />report for this ptoj ect is located in Pddendum 13-3A-E. I, MSChael G. Altavill a, am a <br />1984 graduate Sn mining engines rl ng and I have been a Registered Professional Engineer in <br />Colorado since August 17, 1992. <br />The purpose of my inspection and cent if Scation was to ensure proper construction of <br />Sedimentation Pond O1D and to satisfy the requirements of Rule 4.05.6110) of the Colorado <br />Mined Land Reclamation Board. The material was placed Ln the embankment to meet or exceed <br />the design specification (see Addendum 13-3A-E for compaction informationl. This as-built <br />report confirms the construction of this structure meets or exceeds the Rules and <br />Requlatlons of the Colorado Mined Land Reclamation Board. The structure Ss stable, <br />evidencing no Sndicatlons of slope instability. <br />13-3A-10 Revised 08/30/96 <br />