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According to the current proposed CARB’s regulation, the
total risk from multiple stationary diesel engines at a facility can be
estimated using the risk tables provided in CARB’s Diesel Website. For
existing AB 2588 facilities, the estimated cancer risk from the stationary
diesel engines will be added either to their priority score (facilities
without HRA) or their cancer risk (facilities with HRA) to obtain an overall
facility risk estimate. For facilities with an estimated cancer risk above
10 per million, AQMD staff will ask the facility to prepare a more refined
health risk analysis using HARP and site-specific information including
local meteorological data. Since the tables were developed using a
health-conservative estimate of risk, facilities may find that their risk is
substantially less when a more refined analysis is completed. Facilities
with the calculated overall facility cancer risk of less than 10 per million
and greater than 1 in a million will not have to do any further risk
analysis, since the public notification and risk reduction thresholds
are not exceeded. However, they will be placed in the “District Tracking”
category and will be required to update their inventory once every four
years. Facilities with an overall facility cancer risk of less than one in
a million will be exempt from the AB 2588 requirements and any associated
fees.
Under the current CARB’s proposal, “Diesel Engine-Only”
facilities that reduce their total operating hours and amend their permits
for their diesel engines to less than 20 hours per year combined total for
all engines (for non-emergency operations) are not subject to the AB2588
requirements.
For more information about the following:
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