This section evaluates the potential consequences ofl hazardous
materials
carrier accidents on the tour selected hazmat route segments in Wayne County, including the Detroit Windsor Tunnel, the Ambassador Bridge, the segment of M-TO under Cobo Hall, and the lowered section of NH 0 between the iunction otlt the interchange with Wyoming Road and the interchange with 8 Mile Road.
personnel) response time, the response behavior ol
people
plume, and the response behavior of people residing (or present) near the route that would be in the release plume.
The The
was assumed with a 50 percent potential totality exposure rate and was to estimate the consequences of a release. Regarding residents and others
in the vicinity of the highway,
it
be able to notify them to shelter
was assumed that emergency responders would in place or to evacuate before the hazmat plume
could reach the affected residences and/ or other facilities.
was
segment longer
Some uncertainties were inherent in the evaluation, and these uncertainties could have impacted the risk assessment results. One of the moaitor uncertainties was associated with the accident rate for each of the route segments. The route
evaluated was evaluated
less than a mile. Traffic data averaged
longer route segment may not be representative of the traffic
over a much over a much density in the
short route segment that was evaluated. Varying traffic density significant unknown‘
also posed
of the evaluated segments might estimate.
increase the accuracy of the accident rote
Another uncertainty
uncertainty was associated with the quantity and distribution among
the
classes/divisitons of hazardous materials being transported through Wayne of hazardous materials being transported through Wayne
County. While some inlormotion was collected on the volume and the classes/ divisions ol hazardous materials traveling into and out ol Wayne County, the available collection points olten were distant flrom Wayne County, making an exact count ofl hazardous materials shipments in Wayne County dilliCUltlt to
determine. The uncertainty
in in
hazardous materials classes and divisions presents an uncertainty that might be mitigated by collecting more data. In spite ol the stated uncertainties, a serious
the distribution of shipments among the various presents an uncertainty might
attempt attempt was made to perform an objective analysis. While the
risk data might the relative to
be uncertain, the relative risk numbers should