evaluate the need for short turnarounds to avoid
unnecessary costs.
If the excavation cannot be left open, it should be
lined with a geomembrane and backfilled. This will
aid excavation if test results reveal further
contamination. However, placing a geomembrane in
the excavation prior to backfilling may interfere
with future in-situ remediation (e.g. soil vapor
extraction, bioventing, etc.) and should only be
allowed after careful consideration.
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Open excavations and stockpile areas shall be secured while awaiting
confirmation test results from the soil beneath the tank. The excavation
shall be backfilled as soon as possible after tank and contaminated soil
removals have been completed and confirmation samples have been taken. The
Contractor shall divert surface water around excavations to prevent water
from directly entering into the excavation.
3.7.5
Stockpiles
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NOTE: Soils characterized or contaminated by a
listed hazardous waste and not excluded by 40 CFR
261.4(b)(10) cannot be stockpiled unless the area
has been designated by the state RCRA office as a
corrective action management unit (CAMU);
stockpiling of hazardous waste soil constitutes
storage in a waste pile and requires a RCRA permit;
placing hazardous waste contaminated soil onto
plastic still constitutes a waste pile; therefore,
except as stated above, all hazardous waste soils
must be placed into containers such as drums,
roll-offs or dumpsters.
If analytical tests have not been taken before
editing of this specification, historical data may
be used to assume whether a tank contained petroleum
waste only or hazardous waste, until analytical test
results are in and contents are verified. If the
historical information indicates that a tank did not
contain hazardous waste (as defined by the state),
and there is no reason to believe the tank ever
contained hazardous waste, the soil may be
stockpiled until analytical test results required of
the Contractor are received. If at that time the
results indicate the presence of hazardous waste,
the contaminated soil must be managed according to
RCRA: no stockpiles unless they are designated
CAMUs. If historical data indicates the presence of
hazardous waste, or if there is no historical data,
the specification should be edited to assume that
the contaminated soil is hazardous and should be
containerized.
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Uncontaminated excavated soil and petroleum contaminated soil that is not a
state-regulated hazardous waste shall be [stockpiled and used for backfill
SECTION 02115A
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