Foundation Specifications 0017

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Foundation Investigations

CALTRANS FOUNDATION MANUAL

It also describes and evaluates any seismic hazards that may be present at the site, such as

the amount of ground shaking that can be expected and the possibility of liquefaction

occurring at the site. The report gives recommendations to the Project Designer as to the

type of foundation that should be used for the proposed structure and also recommends the

seismic data, such as peak horizontal bedrock acceleration, that should be used for the

seismic analysis to be performed. The report includes the recommended elevations for

spread footings and pile type and tip elevations.

Most reports include special comments regarding anticipated constructability problems,

such as caving, soil compaction problems, expected variations in pile driving, and potential

problems due to groundwater. This section of the report may even suggest that job-specific

specifications be included within the contract Special Provisions. The Structure Representa-

tive should pay particular attention to these comments. Advance knowledge of potential

problems during foundation work allows for more effective problem mitigation.

The Foundation Report is normally included in the RE Pending File. Structure Representa-

tives should contact the Office of Structure Construction in Sacramento if they do not

receive a copy of the Foundation Report for any project assigned to them.

In the early stages of every project, the project plans should be reviewed to verify that the

footing elevation, pile tip elevations, and type of piling recommended in the Foundation

Report are shown on the contract plans. In addition, the Structure Representative should

confirm that any suggested specifications or design features mentioned within the special

comments section of the Foundation Report are included in the contract plans and

specifications. Personnel from the Foundation Investigations Section and the Project

Designer should be consulted if there are any discrepancies.

If there are special comments regarding constructability problems within the Foundation

Report, these issues should be discussed with the Contractor as early as possible. Once the

Contractor begins work, the Structure Representative should observe if and how the Con-

tractor makes preparations to deal with the constructability problems that they were

informed of. Good documentation of all conversations with the Contractor on these issues

will help in the evaluation of any potential claims submitted by the Contractor.