_GENERAL DOCUMENTS - C1981017 ‎(218)‎

• Permit No: C1981017
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Name: Bid Documents ‎(IMP)‎
• Permit Index Doc Type: General Correspondence
• Media Type: D
• Archive: No

TO: Mid-Continent Resources , Inc.
DATE: January 14 , 1983
PAGE: - 2 -
PHASE 1 - MINE BENCHES AND HAUL ROAD MAPPING
1-A: FIELD WORK. We would perform thorough geotechnical mapping
o t e existing mine benches and haul road system. Flapping would
include subjects such as bedrock formations , soil• cover, geologic
hazards such as landslides and avalanches , methods of road and
benches - construction, original and actual cross-slopes . A detailed
geotechnical map in the scale 1" = 400 ' would be prepared during
this phase of work.
1-B: REPORT PREPARATION. Based on the field mapping, potential
stability problem areas would be identified. Test areas for future
work would be recommended. We anticipate that the following stab-
ility problem and test areas would be identified: potentially un-
stable road cut, potentially unstable mine bench fill, potentially
unstable road fill and an area of potential avalanche hazard. The
results would be presented in form of a report ; after the Mid-
Continent review, the report would be submitted to MLRD.
PHASE 2 - TEST AREAS - DESIGN AND CONSTRUCTION
2-A: ENGINEERING AND DESIGN. After the MLRD review and approval,
the test areas would be designed. We assume that a total of four
test areas would be designed, constructed and monitored during the
proposed long-term program.
The available topographic map (1" = 400 ' ) is not detailed enough
for the design purposes and surveying would be required. We ex-
pect that only sections of the proposed test areas would be sur-
veyed and assume that Mid-Continent Resources would arrange such
surveying.
Based on the results of previous phase mapping, stability analyses
of existing and proposed backfilled configurations of individual
problem areas would be performed. Physical properties of soils that
are necessary for the analyses would be obtained from comparisons
with similar materials and from simple index testing of important
soil types . The analyses would be performed on our own in-house
computer using appropriate slope stability programs .
A detailed reclamation backfilling and grading design would be de-
veloped for each problem area on the mine pads and roads . We assume
that several alternatives for each problem area would be designed;
an alternative would be selected and a detailed design of a test
area (section) prepared.
2-B : CONSTRUCTION. Individual test areas would be constructed at
selected locations along the haul roads and at one or more mine