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Air Data
Note that on October 15, 2008, the United States Environmental Protection
Agency (USEPA) lowered the National Ambient Air Quality Lead Standard from a
quarterly average of 1.5 µg/m3 to a rolling three-month average of 0.15 µg/m3,
effective October 2009. Under the revised standard, the method of collecting the
samples has not changed. Samples are still collected every six days over a
24-hour period using the same type of equipment.
REAL-TIME (DUST) AIR MONITORING
- 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.
The
real-time monitors will be moved around on a daily basis based on
the location of work activities for the day. We
began running the real-time air monitors during non-working
hours on August 13, 2008. That data can also be viewed by
clicking on the links below.
Click on the dates below to view graphs showing the real-time
air monitoring data (both working hours and non-working hours) collected as of
January 8, 2009. Due to the site
conditions (snow/ice covered) and because no activities are taking place at
the Site, the use of the real-time dust monitors was stopped as of
January 8, 2009. Note that the perimeter high volume air samplers continue to
be run every six days for a 24-hour period.
Month of May 2008
Month of June 2008
Month of July 2008
Month of August 2008
Month of September 2008
Month of October 2008
Month of November 2008 Month of
December 2008
Month of January 2009
SITE
PERIMETER (AMBIENT AIR MONITORING FOR LEAD)
- 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.
Perimeter air sampling is conducted every six days using 6 samplers
at various locations around the perimeter of the site that run
simultaneously over a 24-hour period. 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. It generally
takes approximately 2 weeks for the results from the 24 hour high
volume air sampling to be validated and for the information to then
be posted on the web site.
On October 15, 2008, the United States Environmental Protection Agency (USEPA)
lowered the National Ambient Air Quality Lead Standard from a quarterly
average of 1.5 µg/m3 to a rolling three-month average of 0.15 µg/m3,
effective October 2009. Under the new standard, the method of collecting the
samples has not changed (i.e., samples are collected every six days over a
24-hour period).
For construction, two of the air monitors that were
previously located at the Site were relocated to provide additional
information for the community. One was placed just inside
the perimeter fence on Delaware Street where it is visible
to anyone driving near the Site; this provides air lead data
for residential areas adjacent to the Site. The other was
relocated to the Mid-Valley Secondary Center on February 27,
2008, as requested by Throop Borough’s Planning Agency and
Engineer. This monitor provides air lead data near the local
schools.
On August 13, 2008, we began running the downwind perimeter high volume
air samplers during weekend non-working hours (4 of the 6 samplers that run for the
24 hour sampling). Click on the link below in
orange to view the most
recent non-working hours (overnight) ambient air-monitoring data.
Due to the site
conditions (snow/ice covered) and because no activities are taking place at
the Site, the weekend perimeter high volume air sampling was stopped as of
January 5, 2009. The perimeter high volume air samplers continue to
be run every six days for a 24-hour period.
24-hour Ambient Air Monitoring
Results - results from February 11, 2009
Non-working hours (overnight) Ambient Air
Monitoring Results - results from January 2, 2009 to
January 5, 2009
- This graph shows the range of
values for the quarter and the average for each individual sampler for
each quarter.
CO-LOCATED LEAD
SAMPLES (SAMPLES FOR LEAD COLLECTED AT THE SAME LOCATIONS AS THE DUST MONITORS
FOR BOTH WORKING AND NON-WORKING HOURS)
- 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 were
placed at the same location as the Real-Time (Dust) Air Monitors.
This sampling is in addition to what is required by the 100%
Design. The samples were 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 will allow us to compare
the co-located sample results with the results that we obtain every
six days from the perimeter high volume air samplers. Initially, we
will use the data from the co-located samples to compare with the
information being obtained from the dust monitors and as we move
forward, the co-located samples will be helpful in providing data in
the event that a future exceedance occurs at one of the dust
monitors.
In other words, whenever a dust
monitor shows too much dust, the co-located lead sample can show how
much lead, if any, was in that dust.
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.
Click on the dates below to view the results for the co-located lead
samples (both working hours and non-working hours).
August 2008 September 2008
October 2008
November 2008
December 2008
Page Last Modified
Thursday November 12, 2009 12:31:04 PM
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