ETL 1110-1-158
28 Feb 95
some Corps projects. During the remediation work, post-treatment
testing creates logistics problems because of the need to allow
material time to cure and the time required to perform the
quality control testing. If the treated material is to be
deposited in an off-site landfill, temporary lined and covered
stockpiles are generally used to hold the material until testing
confirms it meets all post-treatment criteria. At sites where
the material will be deposited in an on-site landfill, it is
generally placed directly into the landfill with requirements
laid out in the specifications preventing the material from being
covered by subsequent lifts until post-treatment testing is
successfully completed.
e. Treatability Study Goals. Prior to performing an S/S
treatability study, the objectives of the study should be clearly
defined and the applicable regulatory requirements should be
determined. A treatability study performed by the government can
be performed during the remedial investigation, feasibility
study, or design phase. Generally, the objective of a
treatability study performed by the Government is to establish
the feasibility of using a treatment process to protect the
environment, public health, and welfare. Objectives of an S/S
treatability study may also include one or more of the following:
-Determine the most economical mix design;
-Identify handling problems such as oversize material;
-Identify if volatile emissions are a concern;
-Assess physical and chemical uniformity of the waste;
-Determine volume increase associated with the S/S process.
To the greatest extent possible, a treatability study should be
conducted in such a manner that it is representative of the full-
scale remediation process. The results of a treatability study
performed by the Government may be included in contract
documents. However, these results should be provided for
information only. The final mix design selected for use in the
field should generally be the Contractor's responsibility. The
method of disposal of the treated material often plays a critical
role in structuring a treatability study since an off-site
disposal facility may have more stringent requirements for the
treated material than the regulatory requirements.
f. Treatability Study Samples. Sampling, handling, and
waste characterization must be carefully considered so that a
treatability study is run on material which is representative of
site conditions. Evaluation of previous site characterization
data should be carefully performed to determine locations for the
collection of representative samples. Consideration should also
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