_REVISION - M1980244 ‎(30)‎

• Permit No: M1980244
• IBM Index Class Name: Revision
• Doc Name: Appendix E
• From: Cripple Creek & Victor Gold
• To: DMG
• Type & Sequence: AM8
• Media Type: D
• Archive: No

C. CONTRACTOR shall grade all excavations to ensure grades are maintained to provide
• adequate drainage at all times. Work shall be suspended by CONTRACTOR when, in the
opinion of MANAGER and CERTIFYING ENGINEER, [he site is overly wet, muddy, or
otherwise unsuitable for proper maintenance, until directed otherwise by MANAGER, at no cost
to CC&V.
D. In excavations where Structural Fill or Select Structural Fill is to be placed on slopes steeper than
3H:1 V, horizontal benches shall be excavated into the slope to allow fill to be placed in
horizontal lifts. The CONTRACTOR shall continuously bench and key embankment material
into the existing material a minimum of 2 feet.
E. The CONTRACTOR will be responsible for the safety of temporary construction slopes.
CONTRACTOR shall inspect all temporary and permanent open-cut excavations on a regular
basis for signs of instability. Should signs of instability be noted, CONTRACTOR shall
immediately undertake remedial measures and shall notify MANAGER hnmediately.
Permanent cut slopes shall be left in smooth, safe, and stable condition at the end of the workday.
F. CONTRACTOR shall final grade excavations within the valley leach facility to establish
positive drainage to the Pregnant Solution Storage Area. In no case will depressions or bowls be
permitted in the valley leach facility azea.
G. CONTRACTOR shall conduct all excavation and shoring operations in compliance with
applicable MSHA, Colorado State and Federal government laws and regulations.
3.05 SUBGRADE:
A. The MANAGER and CERTIFYING ENGINEER will inspect and approve the exposed
• subgmde prior to any fill or Soil Liner being placed. CQA Monitor will confum that the surface
of the subgrade is smooth and free of debris, grade stakes, angular rocks, roots, branches,
vegetation, mud, ice, or frozen material [f the subgrade is determined to be frozen, using the
criteria identified in Item 3.06.10 of Section 2200, the CONTRACTOR may either remove and
replace the frozen subgrade or wait until subsequent temperature monitoring indicates the fill is
unfrozeq at no cost to CC&V. The subgmde shall have no sudden sharp or abrupt changes in
Bade.
B. CONTRACTOR is responsible for maintaining subgrades in a condition satisfactory to
CERTIFYING ENGINEER. CONTRACTOR shall protect prepared subgrades, including
previously approved subgrade, from weather, construction equipment, or other factors as outlined
in Part 3.06 of the SPECIFICATIONS. Subgmde surfaces, including previously approved
subgrade, that become softened or otherwise unsuitable for placement of fill, shall be repaired to
CERTIFYING ENGINEER'S and MANAGER'S satisfaction, at no cost to CC&V.
C. Prior [o placement of fill materials, CONTRACTOR shall scazify all in-situ materials to a depth
of 6-inches, moismre condition, and recompact the subgmde. Compac[ive effort shall be
adequate [o obtain a minimum of 95 percent of maximum dry density as determined by the
standard Proctor test (ASTM D698) for the particular fill material. Moisture conditioning shall
be adequate to achieve a uniform moisture and density. )n rock azeas, the CONTRACTOR
shall prepaze the subgrade by removing loose rock fragments until competent foundation material
is encountered as approved by CERTIFYING ENGINEER.
D. [f the underlying material is unsuitable to permit proper compaction of the subgmde,
CONTRACTOR shall loosen, aerate (or excavate and remove), and recompact the subgmde
• until the top layer can be compacted as required. The recompacted surface shall then be
scazified, as needed, to provide a good bond between the foundation and fill materials.
Section 02200 Page 6 of 17 Mazch 22, 2000
Earthworks Golder Associates Revision 7
D ~PNASEN PSSA CERTAPPENDICIES4IPPENDIx E TECFC`11CAL SPECIFICATIONSl033PJR"I.DOC