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Air Data
Available for Friday, July 17, 2009
- Real-Time air monitoring (Near Field Zone monitoring) - this type of air
monitoring will determine if dust is migrating outside of the
immediate work area so that additional dust control measures can be
implemented before any dust can move off-site. This
monitoring will consist of continuous, real-time dust
monitoring upwind and downwind of the work zone during all
phases of work with potential for significant release of dust (i.e.,
during soil excavation, backfill, waste placement, and cap
installation.) Real-Time monitoring provides immediate
information on the amount of dust (not just lead) being generated.
Click on the
links below to view graphs showing the real-time air
monitoring data for July 17, 2009:
Working Hours
Weekend
Non-Working Hours
- Site Perimeter Monitoring - this kind of air monitoring consists
of ambient air monitoring for lead using the high-volume sampler method,
which is what has been used for the past 20 years at the Site. This sampling
will determine if air lead is being emitted from the Site. Results with this
type of monitoring are not immediate as the air collection filters have to
be sent to a lab for analysis. The sampler draws
air over a filter and then the filter is analyzed for lead content. The
volume of air that is drawn in is also recorded which gives us the results
of micrograms (µg) of lead in cubic meters (m3) of air.
(Click here for a drawing
showing the locations of the high volume air samplers.)
24-hour Ambient Air Monitoring
Results - results from July 17, 2009
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Co-Located Lead Samples -
this type of air
monitoring consists of air monitoring for lead using personal air monitors (PAMs).
For this monitoring, the PAMs are placed at the same location as the
Real-Time (Dust) Air Monitors or along the perimeter fenceline. This sampling is in addition to what is
required by the 100% Design. The samples are analyzed by a method
that provides a detection limit similar to the detection level that is used
for the perimeter high volume air samplers. This allows us to compare the
co-located sample results with the results that we obtain every six days
from the perimeter high volume air samplers. The co-located samples are also helpful in
providing data when exceedances occur at one of the dust monitors.
The real-time dust monitors are moved around on a daily basis based on the
location of work activities for the day; the co-located samples are located
with the dust monitors each day.
Note: These sample results may have been affected by blank contamination
(click here for an explanation) and thus may overestimate the lead present
in the air when the sample was taken. Click below to view data for July 17,
2009,
Working Hours
(Click here to go back to the
July 2009 calendar page.)
Page Last Modified
Thursday November 05, 2009 12:25:54 PM
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