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Page Title: 7.3.1 Tier II Volatilization Screen
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7.3.1 Tier II Volatilization Screen
The volatilization screen utilizes an electronic spreadsheet for the calculations
and considers the bulk concentration of contaminants in the dredged material and
variables specific to the proposed CDF operation (Table 7-1). Necessary data
include both site and operating conditions and COC chemical properties.
Chemical partitioning assumptions are used to give conservative estimates of the
maximum COC air concentrations and fluxes on- and off-site under both
submerged and exposed dredged material conditions. Project specific information
such as CDF size, area of each disposal event, exposure, wind speed, temperature
and physical and chemical characteristics of the dredged material are required for
the Tier II evaluation. Site-specific values for these variables are entered into the
appropriate cells of the spreadsheet and output provides information on predicted
contaminant fluxes. The results can be compared to OSHA standards. The
spreadsheet, along with documentation, can be downloaded as an ADDAMS
module from the USACE DOTS website at www.wes.army.mil/el/dots. If desired,
equations for manual screening calculations are also available (Myers in
preparation).
The volatilization calculations in the spreadsheet yield COC concentrations at
the interface surface between air and the ponded water or the dredged material in
the CDF. Thus, they are somewhat analogous to effluent concentrations at the
point of release, before mixing is considered. A screening model for evaluation of
dispersion is therefore included in the Tier II spreadsheet calculations for volatiles
(Section 7.5).
7.3.2 Tier II - Volatile Emissions Decision
After consideration of the Tier II volatile emissions screen and dispersion
information, one of the following conclusions is reached for volatile emissions
(Figure 7-2):
1. Information is sufficient to reach a decision regarding volatile emissions.
In this case either:
a. Volatile emissions, after consideration of dispersion, are below
applicable OSHA standards. No further emissions evaluation is
necessary.
b. Volatile emissions, after consideration of dispersion, exceed
applicable OSHA standards, and management actions should be
considered. A decision to implement management actions for
emissions, such as a surface cove or treatment, may require more
detailed information prior to design of such actions. If management
actions are selected, no further emissions evaluation is necessary.
2. Information is not sufficient to reach a decision regarding volatile
emissions. Further evaluation in Tier III, or management actions as an
alternative to further evaluation, should be considered. A decision to
implement management actions for emissions, such as capping or
7-9
Chapter 7
Guidance for Evaluation of Volatile Emissions

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