Environmental Engineering Reference
In-Depth Information
Preliminary Investion
contamination
suspected ?
yes
no
potentially
contaminated
probably
uncontaminated
assessment of
information
site investigation
required ?
no
yes
Exploratory Investigation
suspected
contamination
indication
uncontaminated
no
yes
contamination
found ?
yes
additional
investigation
required ?
no
yes
Main Investigation
additional
investigation
consultation about
the desired
information quality
is information
adequate ?
no
yes
report
Fig. 3.1
The three phases of a site investigation and the main questions and actions for these
phases
During the Preliminary Investigation, information on the site is obtained and
based on that information it should be decided if there is indeed a need to sam-
ple the location. Sampling is not per definition in all situations necessary. It has to
be accepted, however, that the current practice is that at least some data is necessary
to provide sufficient proof for the absence of soil contamination. If however con-
tamination is expected, the conclusion of the Preliminary Investigation will be that
sampling is necessary to confirm, or deny, the findings of that investigation.
The second phase of the investigation is an Exploratory Investigation. In this
phase limited sampling is performed in order to confirm or deny the expectations
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