(VCCEP) Tier 1 Pilot Submission for BENZENE - Tera

wasn’t specifically reported, the total VOC concentrations measured in this study indicated that
the concentrations in-school were on average 6 times lower than those measured in homes.
Because none of the published studies are necessarily representative of in-school air quality
nationwide, exposures have been estimated using both the findings of the Speilman and the
EPA studies. The typical exposure is represented by the urban outdoor ambient concentration
and the high-end exposure is represented by the high-end concentration from EPA’s 10-school
study (EH&E, 2000). These values are presented on Table 7.17.
Benzene VCCEP Submission
March 2006
Table 7.17: Typical and High-End In-School
Benzene Exposures
Exposure Benzene Concentration (µg/m 3 )
Typical 1.6
High-End 7.6
Both typical and high-end benzene intakes from in-school exposures were calculated using the
following equation:
where:
C × ED × EF × ET × IR × ABSi × CF
ADD =
BW × AT
ADD = average daily dose (mg/kg-day)
C = concentration of benzene in school air (µg/m 3 )
ED = exposure duration (years)
EF = exposure frequency (days/year)
ET = exposure time (hours/day)
CF = conversion factor (0.001 mg/µg)
ABSi = benzene inhalation absorption factor; 0.5 (unitless)
IR = inhalation rate (m 3 /hour)
BW = body weight (kg)
AT = averaging time (days)
The in-school total benzene ADDs were calculated and are presented on Table 7.18
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