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a • J,• .~ • (Page 2) MINE ID ~ OR PROSPECTING ID #` M-99-117 INSPECTION DATE 1-23-96 INSPECTOR'S INITIALS ACS OBSERVATIONS This was a joint inspection conducted with Bob Shuckle and Kathleen Sullivan of the Colorado Department of Public Health and Environment, Water Quality Control Division. The extrusion weld repairs to the tailing pond geomembrane liner completed by COM, Inc. between 12-4-95 and 12-29-96 were found to be unacceptable based on vacuum testing conducted by Colorado Lining Company on 1-16-96. Ae a result of these vacuum test failures, COM, Inc. has engaged Colorado Lining Company to cap or patch all of the repairs done by the COM, Inc. crews Colorado Lining Company will also vacuum teat the welds and patches that they complete, and will certify that the work has been completed and tested in accordance with accepted industry practices and standards. At the time of this inspection, Colorado Lining Company had marked the locations on the liner that require capping or patching, but had not yet begun the repair work. The Hazel-A Adit was inspected. The small pool of water behind the secondary containment cofffar dam in the adit was found to be frozen. As a result, the sump pump used to pump-back leakage from the primary bulkhead was also frozen. This ie assumed to be a relatively rare circumstance, only occurring during periods when the air temperature ie well below freezing for eextended periods. As long as the operator continues to pump water from behind the Hazel- A up to the tailing pond on a weekly basis, no discharge ie likely to occur. If the operator find,a that the sump behind the coffer dam begins to fill with water, and that the pump rema:ine frozen, immediate remedial will be required to prevent a discharge. At this time, a tank heater, available at moat hardware or building stores, should be installed in the sump. The synthetic liner on the upstream face of the primary Hazel-A bulkhead had not been adequately affixed to the ad it rib. The Division recommends that the trailing edge of the synthetic liner be pinned or screwed to the rib, using washers or lath so that the plastic wou1~9 not be pulled past the head of the screw or pin, and that the plastic then be lapped to the rib using gunite or some other suitable and durable sealant. Whatever the method utilized, the trailing edge of the plastic must be affixed and sealed to the rib. Ric Fanyo, attorney for COM, Inc. present for this inspection, was notified that a CDPS Permit would have to be obtained prior to any discharges from the Hazel-A Adit. cc: Carl Mount, DMG Bob Shuckle Colorado Dept. of Public Health and Environment water Quality Control Division 4300 Cherry Cr. Dr. S. Denver, CO 80222-1530 Kathleen Sullivan Colorado Dept. of Public Health and Environment WQCD-PE-B2 4300 Cherry Cr. Dr. S. Denver, CO 80222-1530