1999-03-31_REVISION - M1977342 - Laserfiche WebLink

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• (Page 3) • MINE ID R OR PROSPECTING ID 4 M-77-342 INSPECTION DATE 816198 INSPECTOR'S INITIALS ACS • this problem would be corrected by 8/7/98. A culvert installation at Station 87+00 was inspected. The culvert bedding for the single CMP being installed was being compacted at the time of the inspection. The same ephemeral drainage to be carried by this culvert flows out into the south access road alignment on the hillside leading down to the railroad. This drainage will be discussed in a subsequent section of this inspection report. The Con-9 conveyor crossing and the steep slope between Stations 74 and 86 were observed from a vantagepoint at the top of the steep slope. At the Con-9 conveyor crossing, a total of four bents are being installed to carry the conveyor over the perennial stream. An access road has been constructed to facilitate installation of the two bents on the north side of the stream. This access road comprises a small disturbance that is outside the area of affected lands defined in amendment AM-03. This disturbed area will have to be incorporated into the permit as discussed below. The Operator had notified the Division of this disturbance by a telephone call in May 1998. The Forest Service is requiring the Operator to stabilize the steep slope below Station 86 by plating with 4-inch durable rock. The installation of this rock is a change in the approved plan that must be incorporated into the reclamation permit as discussed below. The south access road was inspected. Installation of the permanent road configuration is scheduled to commence on 8/7/98. As discussed above; an ephemeral drainage passes through the access road location down the hill to the rail line. Flows in this drainage are related to snow melt and in response to storm events. The Operator will be installing itches and cross drains to isolate flows from the road. It was noted that topsoil salvaged during construction of the skid road for timber removal was stockpiled at the REC- 6 topsoil stockpile location (discussed below) instead of being stockpiled adjacent to the skid road as described in amendment AM-03. Installation of the mechanically stabilized embankment (MSE) associated with the conveyor snow shed was inspected. MSE wall installation was nearing completion at the time of this ins pection. Snow shed construction had not yet begun. he Operator has deviated significantly from the topsoil stockpile plan approved in mendment AM-03 . The operator had notified the Division of these deviations in May 1998. The primary topsoil stockpile locations in use were either observed or inspected. The largest stockpile is located across the highway from the left abutment of East Branch Reservoir Dam. Another topsoil stockpile is located along the access road on the west side of East Branch Reservoir. Topsoil salvaged from wetlands has been segregated from other plant growth medium in the stockpiles. Both wetland and regular topsoil are clearly marked and identified by the placement of signs. A third topsoil stockpile location at REC-6, along the rail corridor, was inspected. The rail embankment drops-off steeply behind the topsoil stockpile, which will make it difficult to grade the stockpile to 3 :1 as required by the plan approved in amendment AM-03 . The Operator must incorporate the revised topsoil stockpile locations into the permit, and must provide a topsoil stabilization plan specific to the AEC-6 stockpile, as discussed below. It was agreed that the Operator would submit a technical revision application to address the following issues related to the Henderson 2000 conveyor installation project: •1•' Revised topsoil stockpile locations and a specific topsoil stabilization plan for the REC-6 stockpile that will prevent loss of topsoil off the side of the rail embankment. The Operator is reminded that Rule 3 .1.9(4) of the Hard Rock/Metal Mining Rules specifies that "Once stockpiled, the topsoil shall be rehandled as little as possible