Environmental Engineering Reference
In-Depth Information
Boring Logs
General
Logs are prepared to provide complete documentation on the drilling, sampling, and cor-
ing operations and on the materials and other aspects of the subsurface encountered,
including groundwater conditions. They provide the basis for analysis and design,
and therefore complete documentation and clear and precise presentation of all data are
necessary. Normally, two sets of logs are required: field logs and report logs, each serving
a different purpose.
Field Log
A field log is intended to record all of the basic data and significant information regarding
the boring operation. Typical contents are indicated in the example given in Figure 2.91,
which is quite detailed, including the sample description and remarks on the drilling oper-
ations. The field log is designed to describe each sample in detail as well as other condi-
tions encountered. All of the information is necessary for the engineer to evaluate the
validity of the data obtained, but it is not necessary for design analysis. (For material
descriptions see Sections 5.2.7 and 5.3.6.)
FIGURE 2.91
Example of a field test boring log for soil and rock drilling.
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