Origin: Virginia Date: September, 1993 Categories: Emissions Key Words:
Summary: KTA Environmental conducted an industrial hygiene evaluation of highway paving operations. The purpose of this evaluation was to compare worker exposures to asphalt emissions during the production and application of hot mix asphalt materials with and without crumb rubber addition. Three types of asphalt mixes were involved in the testing, dense grade with rubber, gap grade with rubber, and gap grade without rubber. Industrial hygiene air samples were collected from worker breathing zones and work areas. Samples were collected simultaneously at the HMA processing facility and at the paving sites to measure the concentration of specific chemicals, thought to be present in asphalt emissions. Three days of testing were performed, to evaluate worker exposures to the following parameters: total particulate, benzene soluble fraction of asphalt emissions, sulfur heterocyclics, polycylic aromatic hydrocarbons, BTEXS VOCS, and Nitrosamines. NOTE: Pages 4, 6 and 8 may be missing or the report skip the pages.