2014-10-07_REPORT - C1981019 - Laserfiche WebLink

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South Tavlor Fill Inspection Certification On September 17th, 2014, 1 inspected the area in which the South Taylor Excess Spoil Fill is being constructed. This report covers activities associated with both the East Taylor Fill and the West Taylor Fill identified on Map 23A and Map 45 of the approved permit. The purpose of this inspection was to observe status of the fill placement. This inspection is necessary to satisfy the requirements of CDRMS Rule 4.09. 10 (1a) and Rule 4.09.1 (1b). Weather conditions were 70 °F and sunny. West Taylor Fill with A -A' and B -B' Underdrain Area The toe is filled and sloped to the 7830 elevation and rip rap placement has been completed to the 7695 elevation in the West Taylor West Tributary and West Taylor East Tributary channels. Dumping continues at the 8050 elevation of the Temporary out of pit fill. Topsoil is staged within a small area of the southeast end of the East Tributary, with a ring ditch and berm constructed around it to prevent sediment transport from the active mining area. At the time of inspection, topsoil placement had started at the 7775' elevation, working down to the 7715' elevation. The aforementioned topsoil pile was the source for the topsoil placement. The current water level reading of the piezometer well was 223.2 feet from the ground surface, a decrease in water elevation of 0.2 feet from the previous quarter. No structural weakness, signs of instability, or other hazards were noted at the time of inspection. East Taylor Fill with C -C' Underdrain Area: The 7800, 7850, 7900, and 7950 dump benches are completed. During the first quarter of 2014, the Colowyo "025" Rock Crusher was moved to the flat pad above the East Taylor fill, and was placed at the 8000' elevation. Prior to moving the rock crusher into position above the East Taylor Fill, the planned final rock crusher location as well as the crusher fines spoil pile area was reviewed by Mark Gray from Shannon and Wilson Inc., a Consultant for Colowyo. The crusher location and crusher fine spoils were reviewed for compliance with the previous geotechnical study, titled "Revised, Addendum No. 3 to Geotechnical Study for Excess Spoil, Temporary Spoil Stability, Job No. 23 -1- 01105 -206, revised date April 15, 2010 ". After review of the planned crusher and crusher fines locations, as well as the geotechnical study recommendations, Mr. Gray's opinion was that the proposed "025" Rock Crusher relocation was in general conformance with the recommendations of the above mentioned report. At the time of inspection, minimal crusher fines have been produced at the 025 crusher site. 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. No structural weakness, signs of instability, or other hazards were noted at the time of inspection.