Area samples were obtained on 49 charcoal tubes contemporaneously
with 15 of the breathing zone samples. Area
samplers were placed at the following locations: the center of
the undercarriage of the work vehicle, 1 m from each side of
the vehicle, 2 m from the front of the vehicle, and 1 m from the
rear of the vehicle. Area samplers were also placed in adjacent
bays at 4 m and 8 meters away from the work vehicle. All area
samplers were placed at a height of 1.5–2.0 m above the shop
floor, with the work vehicle raised on the shop’s hydraulic
lift. For quality assurance purposes, six (12%) area samples
included two charcoal tubes in dual samplers.