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April 23, 2014 C- 1981- 025/North Thompson Creek Mine BFB <br />Inspection Topic Summary <br />NOTE: Y= Inspected N =Not Inspected R= Comments Noted V= Violation Issued NA =Not Applicable <br />N - Air Resource Protection R <br />R - Availability of Records N <br />N - Backfill & Grading N <br />N - Excess Spoil and Dev. Waste N <br />N - Explosives N <br />N - Fish & Wildlife N <br />V - Hydrologic Balance N <br />N - Gen. Compliance With Mine Plan N <br />N - Other N <br />N - Processing Waste N <br />- Roads <br />- Reclamation Success <br />- Revegetation <br />- Subsidence <br />- Slides and Other Damage <br />- Support Facilities On -site <br />- Signs and Markers <br />- Support Facilities Not On -site <br />- Special Categories Of Mining <br />- Topsoil <br />COMMENTS <br />This was a complete inspection of the North Thompson Creek Mine conducted by Brock Bowles of the Colorado <br />Division Reclamation, Mining and Safety. The weather conditions were partly cloudy with a light breeze. The <br />ground was dry and the vegetation was starting to green. <br />AVAILABILITY OF RECORDS — Rule 5.02.4(1): <br />The mine records were available at the Garfield County Court House in Glenwood Springs. The records <br />listed in the last inspection report that needed to be updated had been updated for this inspection. One additional <br />record that needs to be added is the 2013 Annual Reclamation Report. Seethe Availability of Records format the <br />end of this inspection report. <br />HYDROLOGIC BALANCE - Rule 4.05 <br />Drainage Control 4.05.1, 4.05.2, 4.053; Siltation Structures 4.05.5, 4.05.6; Discharge Structures 4.05.7, 4.05.10; <br />Diversions 4.05.4; Effluent Limits 4.05.2; Ground Water Monitoring 4.05.13; Surface Water Monitoring 4.05.13; <br />Drainage — Acid and Toxic Materials 4.05.8; Impoundments 4.05.6, 4.05.9; Stream Buffer Zones 4.05.18: <br />The North Thompson Creek water was higher than normal, most likely due to spring runoff (photo 1). <br />Mines No. 1 and 3 were discharging water to the long pond (photo 2). The long pond contained water and the <br />bank appeared to be stable. Ponds T1 and T2 contained water and the banks appeared to be stable. The discharge <br />from T2 was directed to Pond P9. The discharge pipe from T2 into the ditch south of P9 needs to have the soil and <br />rocks removed (photo 3). <br />Pond P9 was full and discharging through the emergency spillway ditch. <br />Background: The approved primary and emergency spillways for Pond P9 start at the Southeast corner of Pond P9 <br />(see drawing D -2 -5 in the permit). The primary spillway consists of a 3" diameter pipe within an 18" CMP that is <br />capped so water only flows through the 3" pipe (Drawing D -4 -6, Section F). The primary spillway, and <br />surrounding 18" CMP, are buried under ground and end at a discharge point on the outslope of Pond P9. The <br />approved emergency spillway is an open ditch built on top of the primary spillway. Both spillways follow the <br />Number of Partial Inspection this Fiscal Year: 0 <br />Number of Complete Inspections this Fiscal Year: 4 <br />Page 2 of 6 <br />