EP
30 OCT 00
a. Point Sources. Point source emissions can be controlled. Emission control equipment
should be applied to point sources if required by state regulations or if emission rate action levels
or receptor point action levels are exceeded.
Area Sources. Area source emissions are very difficult to control. The most effective way
to control area source emissions is to control the rate of contaminated material handling. The
remedial action project designer should specify handling rate restrictions if screening level
dispersion modeling results for area source emissions exceed receptor point action levels.
Designers may develop other methods to control area source emissions from HTRW sites, but all
methods chosen should be supported by screening level dispersion modeling results exceeding
receptor point action levels.
Monitor emissions from point sources at the stack to assure that air pollution control
equipment (if used) is working properly or to assure that emission rate modeling assumptions are
correct. Do not attempt to characterize point source emissions using ambient air sampling
or at off-site sampling locations. Daily variability in wind speed
methods at the site
and direction is too great and makes it impossible to characterize point sources at these locations.
Monitor emissions from area sources when screening level dispersion modeling results
exceed receptor point action levels. Use ambient air monitoring techniques at the site
to check the effectiveness of controls and procedures for limiting emissions to the air from the
area source. Specify use of appropriate sampling equipment and analytical methods. See the
Appendix of this document to develop perimeter air monitoring action levels.
A-4
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