2016-06-08_PERMIT FILE - C1982056A

• Permit No: C1982056A
• IBM Index Class Name: Permit File
• Doc Date: 6/8/2016
• Doc Name: Pages 2.05-1 to 2.05-64
• Section_Exhibit Name: 2.05 Operation and Reclamation Plans
• Media Type: D
• Archive: Yes

Pipeline construction will involve placement of sediment control materials (straw wattles or silt fence) downslope
of the disturbance at any location where the pipeline corridor is within 50 feet of a Stream Buffer Zone or non-
qualifying ephemeral drainage; removal and windrowing of available soil material (total soil material volume for
the pipeline project is estimated at 12,150 cy) to one side of the 40 foot pipeline construction corridor; excavation
of the pipeline trench using a track -hoe, with temporary placement of the excavated material on the opposite side of
the trench; placement, connection, and bedding of the pipe; backfilling and compaction of the excavated material
around the pipe; re -spreading of the soil material; and re -seeding using the standard rangeland seed mixture. Where
the pipeline is installed by boring, boring pits will be excavated within the pipeline construction corridor for the
boring equipment and pipe handling. Because the soil materials will be replaced immediately after pipeline
placement, as construction advances, stabilization measures are not necessary.
Where the pipeline crosses under Routt County Road 27, boring or jacking pits will be excavated on the edges of
the road right-of-way, and the pipeline will be bored or jacked under the road. The Fish Creek crossing has been
located to take advantage of a deeply incised stream channel, minimizing potential impacts to the narrow riparian
fringe which exists along this section of the creek. Because pipeline installation activities will occur within Stream
Buffer Zones, TCC is requesting a variance from the Stream Buffer Zone requirements, consistent with the
applicable provisions of Rule 4.05.18. To the extent feasible, the trenched crossing will be completed during the
winter low -flow period. A temporary upstream flow barrier will be established in the channel, and normal
streamflows will be transferred around the work area by pumping from the resulting pool above this upstream
barrier to well below the crossing work area. Pumping capacity will be approximately 10 cfs (greater than
maximum measured historic flows for the construction timeframe) to assure that there is no diminution of flow, and
back-up pumping capacity will be provided in the crossing construction area to address any leakage or underflow.
Details of the Fish Creek pipeline crossing are presented in Exhibit 49R, 18LT Ventilation Shaft Installation —
Design Drawings. If the Fish Creek pipeline crossing is completed by boring the pipeline under the creek, the
surface protective measures, as outlined above, will not be necessary.
Protective measures (BMP's) at the crossing location will include placement of stream buffer zone markers at any
point where the pipeline corridor is within 50 feet of the stream buffer zone prior to any activity; placement of silt
fence or anchored straw bales at least 50 feet downstream to catch any sediment released prior to initiation of work;
placement of sediment control materials (straw wattles or silt fence) around the entire side and near stream
perimeters of the pipeline excavation and stockpile disturbance areas on both sides of the stream; restrictions on
storage or transfers of petroleum products within the buffer zone, and reclamation of the affected areas immediately
following completion of pipeline installation. These measures should be effective in assuring compliance with
applicable provisions of Rule 4.05.18 (1)(a) through (c). Construction and sediment control details are shown by
the design drawings in Exhibit 49R. Manholes, consisting of 8 -foot diameter x 10 -foot high CMP culverts, fitted
with locking lids and access ladders, will be installed at either end of the pipeline for access to pipeline valving.
A second 14.75 -inch diameter Utility Borehole will be completed to a depth of approximately 1,390 feet. A 60 -foot
deep, 16 -inch diameter surface borehole and surface casing will first be completed to support subsequent drilling
operations. The Utility Borehole will be completed with a 13 -inch diameter grouted steel casing, an 8.625 -inch and
a 4.5 -inch diameter pipes will be installed within the casing, and the annulus will be grouted between the borehole
and casing. It is anticipated that the 8.625 -inch pipe will be used as a rock -dust drop, and the 4.5 -inch pipe for
compressed -air. The additional 18LT Rock -Dust Tank Installation will consist of a new rock -dust tank, which will
be mounted on four poured concrete piers; a connection to the new borehole; required electrical and control
equipment, that will tie-in to the existing 18LT Substation; and a dust collection system. The MCC Building
installation includes a 40 x 40 foot concrete pad and steel building and an 8 x 48 foot exterior concrete pad. In
order to accommodate the three large air compressors necessary to meet mine compressed air requirements, the
exterior concrete pad will be extended to 24 x 56 feet. Fourteen, 12 -inch diameter holes will be bored
approximately 20 feet to bedrock, and surface materials in the pad extension footprint will be over -excavated,
replaced, and re -compacted. Reinforced concrete piers and pad will be pored to support the compressors and a pre-
fabricated steel building will be constructed on the extended pad to enclose the compressor installation.
Following commissioning, the shaft pad site, access road, and pipeline corridor will be cleaned -up and surface areas
graded and stabilized by seeding with the temporary seed mixture. When these facilities are no longer needed to
support ongoing or future mining and related operations, reclamation will involve removal of surface structures and
facilities, demolition of concrete foundations and pads, disposal of concrete debris in the shafts, replacement of
MRI 1-259 2.05-45.20 11/28/11