Summary: Emissions test data is shown in the results section of this report and in the Tables section. The following is a general review of the data:
• Consistent PM results when comparing the two (2) crumb rubber conditions. Both conditions meet the EPA limit of 0.04 gr/dscf for asphalt plants (40 CFR 60, Subpart I). • Higher visible emissions during the high temperature, crumb rubber condition. • Increase in total VOCs with the crumb rubber additive, with a larger increase at high temperature. • Slightly lower benzene emissions with the crumb rubber (at both temperatures) than with the conventional asphalt. • Higher styrene emissions at the high temperature crumb rubber, with slightly lower styrene emissions at the low temperature crumb rubber as compared with conventional asphalt. • In some instances higher VOST compound emissions occurred with the crumb rubber, other instances there were lower VOST compounds emissions on the crumb rubber asphalt, as compared with conventional asphalt. • Nondetectable 1,3 butadiene emissions at both crumb rubber operating conditions, with a detectable amount during the conventional asphalt test. • Nondetectable benzo(a)pyrene emissions at all three (3) operating conditions. • Slightly higher total polycyclical aromatic hydrocarbons at the high temperature crumb rubber condition, with slightly lower emissions at the low temperature crumb rubber condition as compared to the conventional asphalt. Also, consistency in the compounds present was demonstrated (naphthalene and 2-methyl naphthalene was present at all 3 conditions, with phenanthrene present at the high temperature conditions with and without crumb rubber) • Overall higher total speciated organic emissions at the high temperature crumb rubber condition, while lower total speciated organic emissions at the low temperature crumb rubber condition as compared to the conventional asphalt mix condition. • Formaldehyde emissions data were not qualified due to an error in the EPA published draft method.