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example being that of sampling for PAHs and PCBs. If other COC that require
different sorbent traps are present, additional flux chambers will need to be used.
All samples should be thoroughly homogenized before conducting bulk sediment
analysis and volatile emissions testing.
F.2.4 Laboratory conditions
Testing can be conducted at laboratory ambient temperatures or the
chambers can be placed in temperature controlled water baths to give colder or
warmer sediment temperatures.
1
F.2.5 Laboratory volatile emissions test procedure
The step-by-step procedure for conducting volatiles emissions testing is
outlined below:
Step 1 Loading flux chamber. Fill flux chamber with a known amount of
sediment to the top of the sediment well (10 cm in height). Ensure that the
sediment surface is as level as possible to promote laminar air flow over the
surface. Seal the chamber using an o-ring and threaded fasteners.
Step 2 Trap attachment. Apply contaminant-specific air sampling tube
to the exit port of the chamber. Sampling tubes can be arranged in a series to
ensure capture of all contaminants if contaminant trap breakthrough is a
possibility. If sediment is extremely wet and trap material retention capacity is
affected by moisture, a moisture retention trap, such as a tube loaded with
Drierite, can be added in-line prior to trap (Figure F-2).
Step 3 Carrier air application. If laboratory "house" air or compressed
air is used, it should be passed through adsorbent traps to remove potential
contaminants prior to use. Attach a flow meter to the air entrance port, followed
by a line to compressed air supply (Figure F-2). If a vacuum pump is used to
pull air over the sediment surface, first attach drier tube (if needed), followed by
absorbent trap, flow meter, and then attach vacuum pump tube to exit side of
flow meter. Pass or pull dry air over the sediment surface at a rate of 1.7 L/min.
(This will ensure maximum contaminant fluxes from the sediment).
Step 4 Sampling. The length of sampling and total sampling period will
be dependent upon contaminant concentrations in the sediment. If
concentrations are relatively low, a longer sampling interval (i.e., 24-hr
continuous sample) may be necessary to ensure trap contaminant concentrations
are above analytical detection limits. An example sampling regime used in
previous laboratory investigations consisted of sampling at intervals of 6 hr, 24
hr, 7 days, 10 days, and 14 days.
1
A sample laboratory schematic is shown in Figure F-2.
F4
Appendix F Laboratory Evaluation of Volatile Emissions and Volatile Dispersion Modeling

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