2008-12-05_REPORT - C1981019 - Laserfiche WebLink

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East Taylor Fill Inspection Certification On June 30, 2008, 1 inspected the area in which the East Taylor Excess Spoil Fill is being constructed. The purpose of this inspection was to observe the completion of the topsoil stripping and the status of the underdrain trench construction. This inspection is necessary to satisfy the requirements of CDMG Rule 4.09.10 (1 a) and Rule 4.09.1 (1 b). All topsoil stripping within the footprint of the B-B' and C-C' underdrain areas was completed prior to or during the summer and fall of 2007. No construction progress occurred during the previous quarter. C-C' Underdrain Area: During the first quarter of 2008 (week of January 28, 2008), the C-C' underdrain trench and a lateral drain were excavated by dozer. Moisture resulting from the spring snowmelt subsequently resulted in localized slumping which necessitated re- excavation of the entire underdrain trench and lateral drain prior to rock placement. In July, 2008, excavation of the C-C' trench was restarted and subsequently completed. Construction of the trench, along with rock placement, is being performed by the mine's road crew. Fabric placement is being done by Anson Construction. As of the date of this report, about 75% of the rock placement is completed, and about 30% of the trench has been covered with fabric. B-B' Underdrain Area: Construction of the B-B' underdrain is being performed by Anson Construction. Trench excavation, rock placement, and fabric placement was started this quarter and is well underway as of the date of this report. No excavation or other work below the confluence with the A-A' trench. Rock placement is roughly 50% complete and fabric placement is about 30% complete as of the date of this report. Fill placement within portions of the spoil pile footprint has also begun. This includes the lower portion of the C-C' underdrain as well. Upon completion of the fabric placement over the underdrain in the B-B' and C-C' areas, a separate construction report with as-built information and photographs will be submitted. The A-A' underdrain has not been started. Design requirements for the spoil pile are addressed in Volume 13, Exhibit 21, Item 1, Introductory Letter. Inspection requirements during construction are further detailed in Volume 12, Section 4.09. I am a Registered Professional Engineer in the State of Colorado and a representative of Environmental Solutions, Inc, P. O. Box 2996, Cheyenne, Wyoming. Being familiar with the Colowyo operation and the coal program permitting process in Colorado, the construction activities related to the East Taylor Fill are in conformance, to the best of my knowledge and experience, as specified in the Introductory pages and the associated report found in Volume 13, Exhibit 21, Item 1 and other applicable requirements of the approved permit documents, a portion of CDMG Permit C-81-019. 4. "'011111111R/ L `?? ?P•••••••••• F4, O :.• C. AEIFp • ?F ?. • 32257 z lltf111? TH P E. No 3225 RSON