2010-11-15_REVISION - M1980244 ‎(181)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 11/15/2010
• Doc Name: QA Monitoring and Test Results- 2010, VOL.1 Cover & table of contents
• From: CC&V
• To: DRMS
• Type & Sequence: AM9
• Email Name: BMK
• Media Type: D
• Archive: No

ameo
•
then placed onto the CP. After the CR was allowed to cure, SF was then
placed to the final grade, as needed. In some cases, the excavation did
not require placement of CSB prior to placement of the CP and CR.
For collapsed workings extending deeper than 25 feet and where the
depth to competent bedrock was less than 7 feet to the final SLF
subgrade surface, the collapsed materials were excavated to a depth of
25 feet below finished grade. The excavations were either backfilled with
CSB to approximately 10 feet below the finished grade or shaped for the
CP at a workable depth below 10 feet. The surface of the CSB or existing
material was compacted using the shovel from a CAT excavator. A 3-foot
minimum CP was cast into the shaft and allowed to cure for a minimum of
7 days. A minimum 7-foot thick layer of CR was then placed onto the CP.
After the CR was allowed to cure, SF was then placed to the final grade,
as needed. In some cases, the excavation did not require placement of
CSB prior to placement of the CP and CR.
• For collapsed workings extending deeper than 25 feet and where the
depth to competent bedrock was greater than 7 feet to the final SLF
subgrade surface, the collapsed materials were excavated to a depth of
25 feet below finished grade. The excavations were either backfilled with
CSB to approximately 3 feet below the soil/bedrock interface or shaped
for placement of the CP. The surface of the CSB was compacted using
the shovel from a CAT excavator. A 3-foot minimum CP was cast into the
shaft and allowed to cure for a minimum of 7 days. A minimum 7-foot
thick layer of CR was then placed onto the CP. After the CR was allowed
to cure, SF was then placed to the final grade, as needed.
• Shallow surface pits that were less than 25 feet deep below the final SLF
subgrade surface were excavated to bedrock or pit termination. The pits
were then backfilled with compacted SSF and SF to the final subgrade
elevation.
In some cases, shallow surface pits were completely removed during
slope re-contouring and required no further remediation.
2.1.2 Remediation of Laterals/Inclines/Adits
A number of laterals and adits were identified within the Phase 5 VLF. Per the remediation
recommendations, underground workings that were identified within 50 feet of the finished
grade elevation were remediated. Workings that were deeper than 50 feet below the final
grade elevation did not require any remediation.
r?
AMEC Earth & Environmental, Inc.
2000 S. Colorado Blvd 2-1000
Denver, CO 80222
Tel [phone]
Fax [phone] wv w.amec.com
11