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also installed. Peabody Coal Company will periodically inspect the structure for sediment <br />storage, structural integrity, end hazardous conditions. Maintenance and remedial work <br />will be performed in accordance with the approved mine permit. <br />Stability Monitoring <br />According to the Amuedo end Ivey report regarding the pond stability and the geotechnicaL <br />investigations presented in Ground Engineering's report, Cne- majority of the pond <br />structure is located on stable ground. As an added measure of safety, stability monitor <br />monuments were installed at the pond es located an Exhibit 13-SA. These monuments will be <br />surveyed quarterly (weather permitting) to detect any movement and kept on file at the <br />mine. CDMG will be notified of any major movement detected and a remediation plan will be <br />prepared based on the severity of the situation. If no (or negligible) movement is <br />detected after four quarters, the information will be submitted to CDMG along with a <br />request to suspend the monitoring. <br />Construction Summary <br />[n accordance with Rule 4, Pert 4.05.6(7) of the Rules and Regulations of the Colorado <br />Mined Land Reclamation Board (CM LRB) pursuant to the Colorado Surface Coel Nining <br />Reclamation pct 34-33-101 e[ seq., 1, Ronald J. Gehrke, hereby certify that [he <br />construction of Sedimentation Pond 005 was inspected and constructed under my supervision. <br />The construction of Pond 005 was supervised on site by Chuck NcCUlloh, Operations <br />Engineering Manager at the Seneca II-Y Mine. Chuck assured ell work was performed in <br />accordance with the design end the specifications. Thomas Yeinwright, P.E., Senior <br />Engineer was at the site on June 22-26, 1992, during construction of the underdrain end <br />embankment construction. 1 inspected the structure on July 13, 1992 to verify the pond's <br />pri ntipel spillway installation end embankment construction. I inspected the Pond 005 site <br />on August 5, 1992 to verify the as-built conditions. I, Ronald J. Gehrke, am a 1977 <br />graduate in civil engineering and 1 have been a Registered Professional Engineer in <br />Colorado since November 22. 1982. <br />The purpose of my inspection and certification was to ensure proper construction of <br />Sedimentation Pond 005 and to satisfy the requirements of Rule 4.05.6(7) of the Colorado <br />Mined Lend Reclamation Board. The material was placed in the embankment to meet or exceed <br />the design specification (see Addendum E for compaction information). This es-built <br />report confirms the construction of this structure meets or exceeds the Rules and <br />Regulations of the Colorado Mined Land Reclamation Board. The structure is stable, <br />evidencing no indications of slope instability. <br />13-3-14 Revised 08/11/92 <br />