2009-12-21_REVISION - M1980244 ‎(32)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 12/21/2009
• Doc Name: QA Liner Recert- App. E, Tech Specs. 2
• From: CC&V
• To: DRMS
• Type & Sequence: AM9
• Media Type: D
• Archive: No

PART 3: EXECUTION
3.01 EXCAVATION
A. 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.
B. CONTRACTOR shall conduct all excavation and shoring operations in compliance with applicable
Colorado State and Federal government laws and regulations.
3.02 FILL PLACEMENT
A. Structural Fill
CONTRACTOR shall condition, place and compact Structural Fill by a method
compaction technique, as discussed in Section 2200.0.
Maximum rock size for rock fill shall be two - thirds of the compacted lift thickness, unless
otherwise approved by MANAGER, DESIGN ENGINEER, and CERTIFYING
ENGINEER. CONTRACTOR shall remove oversize materials from fills at no additional
cost to CC &V.
0 B. Select Structural Fill
CONTRACTOR shall condition and compact the Select Structural Fill using a method
specification on 3 -foot thick lifts that result in a firm surface that will be approved by the
CERTIFYING ENGINEER.
C. Coarse Shaft Backfill
1. Coarse Shaft Backfill shall be placed in the underground workings as part of remediation, as
shown in the DRAWINGS.
2. CONTRACTOR shall compact and condition the final surface of the Coarse Shaft Backfill
using a method specification that results in a firm surface that will be approved by
CERTIFYING ENGINEER.
3.03 NATIVE MATERIAL
For the remediation of shafts greater than 25 feet, which are currently backfilled with native material,
CONTRACTOR shall excavate the current native backfill to a depth of 25 feet below Soil Liner Fill subgrade
elevation. The surface of the native material at this elevation will then be compacted using a method
specification that results in a firm surface that will be approved by CERTIFYING ENGINEER.
CONTRACTOR shall then remediate the underground working using Coarse Shaft Backfill, Cement Plug,
and Cemented Rockfill as shown on the DRAWINGS.
Section 02210 Page 2 of 3 September 3, 2008
Underground Working Remediation Revision 1
SAProjects \1125E CCV CQA \I - Tech Specs \02210.rt.doc