2012-11-15_REPORT - M1980244 (6)

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RECEIVED ED Division of & safety "9 Mining An Im I m1e, MILL SITE EARTHWORKS FIELD MONITORING SUMMARY (WEEKLY REPORT) Project Title: Mill Site Earthworks Owner: Cripple Creek & Victor Gold Mining Co Location: Cripple Creek & Victor Gold Mine Work Element: Mill Site Earthworks Date: ust 12 Reporting Period: 8/19/2012 through 8/25/2012 Days S I M I T I W T F S Work Shifts D D D D D D D = Day Shift N = Night Shift Project No.: 74201125KO Contractor: Ames Construction Co., Inc. Shift: Day /Night Ambient Temperature Range ( °F): Low: 46 °F to 50 °F ( + / -) High: 63 °F to 75 °F AMEC CQA: Personnel On -site through the Reporting Period (See Attachment A). Ames: None CONSTRUCTION ACTIVITIES and PROGRESS: I) Earthworks A) Subgrade Preparation Subgrade preparation was performed prior to overburden fill placement in the areas shown on Figure 1. Various CAT dozers were used to rip the existing surface to a depth of at least 6- inches. Moisture conditioning of the subgrade was performed (when necessary) using a CAT 773 water truck. Compaction was performed using a 10 -ton vibratory smooth drum compactor passing over the entire subgrade surface at least four times. The subgrade was inspected and approved by an AMEC field representative, prior to fill placement. In most areas, excluding flat areas where fills were started, the subgrade is keyed into as the fill progresses. This is due to steep slopes that are adjacent to most fill areas. In these instances, the subgrade is inspected for organics and debris by an AMEC field representative prior to fill placement (keying into the subgrade). B) Overburden Fill Placement Overburden fill material was delivered from CC &V Mine Operations throughout the day shift. Ames CAT D -10 dozers were used to maintain the borrow area. A CAT 992 and CAT 988 front - end loader were used to load overburden fill material into CAT 40 -ton articulating haul trucks. Overburden fill was placed in the areas shown on Figure 1. Overburden fill was placed in 36" to 40" loose lifts using various CAT dozers, keying into existing slopes when necessary. Various CAT excavators with a hammer attachments "broke up" oversize boulders before they were placed in the fill. Each lift was moisture conditioned using a CAT 773 water truck (when necessary) and compacted using a 10 -ton vibratory smooth drum compactor, passing over the entire fill surface at least 4 times (method compaction technique was applicable). MEW Weekly Report WE 08.25.2012