EP
30 OCT 00
meteorological data, evaluating site-specific model input parameters, and analyzing results.
Needs. Meteorological data, both from the surface and upper air, are
Meteorological
necessary input to run refined dispersion models. Sources of both types can be found at
The meteorological data at this web site are very
comprehensive. The site will likely have data that can be applied to HTRW remedial action
designs at any location. Only on rare occasions will it be necessary to collect site-specific data.
Determine if site-specific emissions to the air are acceptable
by comparing modeled emission rates (point sources) and dispersion modeling results to
emission rate action levels (point sources) and receptor point action levels (point sources and
area sources). Seek support from regulatory specialists and risk assessment staff to define
specific emission rate and receptor point action levels. In general, emission rate action levels for
point sources will be defined by state regulations or regulatory guidelines. Receptor point action
levels are also influenced heavily by state regulatory guidelines but often times require risk
assessment input because of a lack of state regulatory criteria. It is very important that
remedial action designers contact the state air quality regulators in the air quality region where
the project is located very early in the design process to arrive at a mutual understanding of
requirements.
Point Sources. The following analysis procedure is recommended for point sources.
(1) Review the proposed design to assure that air emission control technology complies
with state-specific air pollution control technology requirements/guidelines for all pollutants
emitted to the air from the point source.
(2) Compare modeled emission rates to emission rate action levels. Adjust control
equipment
if necessary, to assure compliance with emission rate action levels. Owing
to the variability of most point source emissions on HTRW sites, the efficiency of emission
control equipment is negotiable with most state regulators.
(3) Compare point source dispersion modeling results to receptor point action levels to
assure that point source emissions are acceptable.
Area Sources. The following procedure is recommended for area sources.
(1) Compare area source screening level dispersion modeling results to receptor point
action levels. Area source emissions are considered acceptable if screening level results are less
than receptor point action levels.
(2) Include perimeter air monitoring as part of the remedial action design if screening level
dispersion modeling results exceed receptor point action levels. See Appendix of this
document for development of perimeter air monitoring action levels.
A-3
Previous Page
