PERMFILE40184

• Permit No: C1981039
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Pages III-1 through III-62
• Section_Exhibit Name: III. OPERATING PLAN
• Media Type: D
• Archive: No

• Although neither of the samples is representative of the road
fill, some conclusions can be drawn regarding the durability of the
rock. The outcrop sample consisted of a single large rock. The
exterior of the rock was substantially harder than the interior, pro-
bably due to the chemical affects of weathering. The interior disin-
tegrated easily, to a fine sand. This sample, being exposed at the
surface for many years, was substantially weathered. The natural
cement within the rock had been weakened. A Los Angeles abrasion test
run on this sample showed a 99% loss; the rock disintegrated to a very
fine sand during the test.
The core sample consisted of a sandy shale. It can be described
as a thinnly laminated, slightly calcareous, fossiliferous 9reywacke.
The sample was hard and competent, even after being exposed to the
elements for several months. A Los Angeles abrasion test could not be
run on the core because an insufficient amount of rock was available.
During exploration drilling of Pit No. 4, the lower sandstone
interburden was found to be the hardest of the rock encountered,
harder than the core sample. This sandstone, which will form the haul
road embankment fill, will probably have to be blasted, rather than
ripped by a dozer.
The field observations and laboratory testing have led to the
• following conclusions regarding rock durability:
(1) The sandstone fill in the haul road embankment will consist
of a sandy gravel, originating from the bench excavation and
from Pit No. 4; '
(2) The material from the bench excavation will weather more than
the rock from the pit;
(3) The rock from the pit will probably not weather significantly
during the life of the haul road. Some decay of the near-
surface sandstone may occur;
(4) That part of the embankment fill which does weather will form
a fine sand. The internal strength and drainage of the fill
will not be significantly reduced by weathering of the
sandstone.
During construction of the new haul roads, adjustments will be made
to the alignment, the road width, the foundation excavation and the
drainage system. These adjustments will be made in order to reduce
erosion, to increase stability and to increase safety.
Initially, a pioneer road will be constructed along the approxi-
mate final alignment. The area to receive fill will be cleared and
grubbed. Topsoil will be stripped and transported to the designated
storage areas.
After topsoil removal, benching of the foundation wi]l begin.
• Colluvium and excavated rock will be placed on the lower benches.
This will progress upslope until all local materials are used.
Material from the pit will be brought in to complete the fill.
8-81 II1-11