Critique of Hanford Waste Vitrification Plant off-gas sampling requirements Page: 52 of 67
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long-term atmospheric dispersion model to estimate plant influences on
ambient air quality around the Hanford Site (Andrews and Rhoads 1989).
A comparison of model concentrations of CO and ambient boundary condi-
tions could not be drawn, since current and past environmental surveillance
programs at the Hanford Site do not include monitoring the pollutant CO.
Although- federal and state annual standards for this effluent have not been
established, regulations covering 8- and 1-hour exposures have been defined
by the state. The 8-hour standard is 10,000 pg/m3 (9 ppm), and the 1-hour
standard is 40,000 pg/m3 (35 ppm) (U.S. DOE 1987). These standards exceed
the annual modeled ground-level air concentrations of CO by seven to eight
orders of magnitude.
Although average site boundary conditions for CO do not at present
exist, maximum background ambient air concentrations of CO have been measured
near the Hanford Site in Kennewick, Washington (U.S. NRC 1982). The values
found were well below the 1-hour and 8-hour regulatory standards and orders
of magnitude greater than Hanford Site boundary concentrations projected for
the HWVP source. Since the probability that a 1oX surge in noncondensible
MOG flows will occur is only once in 17 operating years (Kessler and Randall
1984), and the average projected HWVP contributions to site boundary condi-
tions are many orders of 10 below ambient concentrations of CO, it is clear
that all credible HWVP operations will be in compliance with all existing CO
regulatory standards. Consequently, HWVP stack monitoring for CO will not be
required.
Similar atmospheric-dispersion modeling was conducted to establish the
impact of HWVP NOx (as NO2) emissions upon ambient air quality about the
Hanford Site (Andrews and Rhoads 1989). Using the nominal feed composition
data (HWVP TOP) and an off-gas abatement efficiency of 90%, projected air
concentrations of NO2 from the HWVP are found to be four to five orders of
magnitude lower than the routinely monitored ambient NO2 concentrations about
the Hanford Site and five to six orders of magnitude below the applicable
federal and state annual average ambient air standard for NO2, which is
100 pg/m3 (0.05 ppm) (see Jacquish and Mitchell 1988, p. 3.9). Under worst-
case conditions (maximum NO3 and no DF), HWVP contributions to boundary NO2
concentrations would only increase by a factor of 40 and would not,4.5
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Goles, R.W. Critique of Hanford Waste Vitrification Plant off-gas sampling requirements, report, March 1, 1996; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc672804/m1/52/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.