2012-12-27_REPORT - M1980244 ‎(13)‎

• Permit No: M1980244
• IBM Index Class Name: REPORT
• Doc Date: 12/27/2012
• Doc Name: QA Mon. & Test Results, ‎(PSES)‎- Append. E, Specs.
• From: CC&V
• To: DRMS
• Email Name: TC1
• Media Type: D
• Archive: No

Section 02200
Earthworks
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B. CONTRACTOR shall prevent the disturbance of surrounding areas during excavation. Where
selective excavations are required to obtain materials for Structural/Overburden Fill and Select
Structural Fill, the material removed from the excavations shall be taken directly to the fill areas or, if
required, stockpiled by material types. The stockpiles shall be approved by MANAGER.
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, m the opinion of
MANAGER and CERTIFYING ENGINEER, the 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/Overburden Fill or Select Structural Fill is to be placed on slopes
steeper than 3H: IV, 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 immediately. Permanent cut slopes shall
be left in smooth, safe, and stable condition at the end of the workday.
F. 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 subgrade
prior to any fill or Soil Liner being placed. CQA Monitor will confirm that the surface of the
subgrade is smooth and free of debris, grade stakes, angular rocks, roots, branches, vegetation, mud,
ice, or frozen material. If 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 unfrozen, at no cost to CC &V.
The subgrade shall have no sudden sharp or abrupt changes in grade.
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. Subgrade 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 to placement of fill materials, CONTRACTOR shall scarify all in -situ materials to a depth of
6- inches, moisture condition, and recompact the subgrade. Compactive effort shall be adequate to
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. In rock areas, the CONTRACTOR shall prepare the subgrade by
removing loose rock fragments until competent foundation material is encountered as approved by
CERTIFYING ENGINEER.
D. If the underlying material is unsuitable to permit proper compaction of the subgrade,
CONTRACTOR shall loosen, aerate (or excavate and remove), and recompact the subgrade until
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June 19, 2012
Revision 1