TranSystems Corporation - LGM Construction

501070099 Federal Express Oakland Sort Expansion Issued for Bid 10/11
J. Side Slopes: Embankment side slopes shall not exceed 2 horizontal to 1 vertical.
3.5 WET CONDITIONS/WET WEATHER CONSTRUCTION CONSIDERATION:
A. Where wet or yielding subgrade conditions are encountered, those conditions shall be corrected
through excavation and replacement or through cement or lime-treating.
1. Excavation and Replacement: Overexcavate soft, yielding area to limits directed by Engineer.
Place geotextile fabric and backfill the area with a more select material such as Class 2 aggregate
base meeting Caltrans specifications.
2. Cement or Lime-Treating: Selection of the appropriate additive and amount of additive required
shall be determined at the time of construction and may vary based on conditions noted.
Contractor shall submit to Engineer the proposed additive, as well as mixing, proportioning,
compaction and procedural method for Engineer’s review prior to subgrade stabilization activities.
Mixing of additive into soil shall be by mechanical means. For bidding purposes, assume 5 percent
cement additive (by weight) and treatment to a depth of 12 inches. The unit price provided shall
include all materials, labor and equipment required to spread, and mechanically mix the additive
into the soil and compacting to the required compaction levels.
3.6 FIELD QUALITY CONTROL
A. Testing Agency: Owner will engage a qualified independent testing and inspecting agency to perform
field tests and inspections and to prepare test reports.
B. Allow testing agency to test and inspect subgrades and each fill or backfill layer. Proceed with
subsequent earthwork only after test results for previously completed work comply with requirements.
C. When testing agency reports that subgrades, fills, or backfills have not achieved degree of compaction
specified, scarify and moisten or aerate, or remove and replace soil to depth required; recompact and
retest until specified compaction is obtained.
3.7 CEMENT TREATED BASE
A. Refer to Section 02239, Cement Modification of Soil.
3.8 PROTECTION AND DISPOSAL
A. Protect newly graded areas from traffic, freezing, and erosion. Keep free of trash and debris.
B. Repair and reestablish grades to specified tolerances where completed or partially completed surfaces
become eroded, rutted, settled, or where they lose compaction.
C. Where settling occurs before Project correction period elapses, remove finished surfacing, backfill with
additional soil material, compact, and reconstruct surfacing.
EARTHWORK 02300 - 5