2011-12-15_REVISION - M1977493 ‎(2)‎

• Permit No: M1977493
• IBM Index Class Name: REVISION
• Doc Date: 12/15/2011
• Doc Name: ENVIRONMENTAL PROTECTION PLAN
• From: CLIMAX
• To: DRMS
• Type & Sequence: TR18
• Email Name: ECS
• Media Type: D
• Archive: No

Technical Revision (TR -18) Climax Molybdenum Company
Environmental Protection Plan Permit No. M- 1977 -493
smaller seepage collection pond that acts as secondary containment of the seepage. This second pond
supports a small pump that returns seepage back to the first collection pond. The discharge pipeline for
the system extends from the pump station along the south side of Eagle Park Reservoir to the discharge
point at Robinson Lake.
The intent of the collection system configuration is to minimize the collection of surface runoff from the
downstream face of the dam. This surface runoff is not impacted by mine materials and can be routed to
the stream system. Seepage from the dam toe is contained and routed into the collection pond.
Backup systems in place at this EPF to prevent discharge of impacted water to the East Fork of Eagle
River include an installed backup pump and a diesel generator for use in the event of an extended loss of
power. Instrumentation and telemetry equipment is in place to trigger an alarm at the mill facilities in the
event of a high water level in the collection pond.
Robinson Lake Pump System: The location of the new Robinson Lake Pump Station is just below
Robinson Dam. The former pump station facility in this location has been decommissioned. The new
Robinson Lake Pump Station and reclaim water pipeline are part of the process water reclaim system
allowing for the recycling and re -use of water from the TSFs. Water will be pumped to the mill water
storage tank through a 21,000 foot buried steel pipeline for use as process water in the milling circuit. As
described above, recharge to Robinson Lake will be accomplished by transferring water from Tenmile
TSF and Mayflower TSF via the Tenmile Tunnel. The new pump station has a nominal operating
capacity of 10,000 gpm. The Robinson Lake Pump Station and pipeline design was submitted to, and
approved by, DRMS in 2008 under TR -14 and later in 2011 under TR -17 due to a change in pipeline size
and alignment.
The design of the Robinson Lake reclaim water pump system is based on using the existing outlet pipe
from Robinson Lake. A new hydraulically actuated outlet works valve was installed in 2008 along with
new piping at the downstream toe of the embankment. In 2011, as part of construction of the new
Robinson Lake Pump Station, new piping will connect the outlet works piping into the pump station.
The Robinson Lake Pump Station building is designed as a pre - engineered metal building. No potable
water or sanitary sewer systems are designed to be included in the building. The building is configured
so that all spills and leaks inside the building are captured by a sump and pumped to Robinson Lake by a
dedicated sump pump.
The pump station and pipeline are designed to preclude accidental discharge to Eagle Park Reservoir
and East Fork Eagle River. If a leak were to occur in the pipeline, water would either flow into one of the
surface containments on site such as Robinson Lake or Robinson TSF or the Robinson Dam seepwater
collection ponds. As with other EPFs, Climax conducts daily visual inspections of all active pipelines
during each shift, and will include inspections of the entire reclaim system during each shift when that
pipeline becomes operational. These frequent visual inspections provide for immediate detection and
response should a leak occur and are a key component to a comprehensive monitoring /mitigation system
to prevent potential environmental impacts. Additional information regarding system alarms at the
Robinson Lake Pump Station is in Section T- 5.4.2.
Chalk Mountain Interceptor. An extensive clean water interceptor system has been established by
Climax around the affected areas of the Eagle River Watershed. The Chalk Mountain Interceptor
conveys storm water around the process facility and TSFs, which limits the amount of impacted waters to
be treated and discharged. As agreed upon with DRMS, although this interceptor is considered to be a
pre -EPF system and does not contain or control designated chemicals or process solutions, it will be
managed as an intemal EPF. The interceptor is closely monitored, inspected and maintained as part of
routine site monitoring activities. Other than normal repair and maintenance, any future expansion or
modifications of the interceptors will be subject to review by DRMS, consistent with Section
6.4.21(10)(a)(ii) of the Rules.
This Chalk Mountain Interceptor starts near the top of Fremont Pass and collects runoff primarily from the
north slope of Chalk Mountain. The system discharges the collected water either into Eagle Park
Reservoir or into the East Fork Eagle River. Except for a few culvert sections, the interceptor consists of
an unlined ditch that is cut into the hillside. The ditch is paralleled by an access and maintenance road.
EPP: Version R2
T -23 December 2011