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9.5 Install a preweighed filter in the sampler following the instructions provided in the sampler
manufacturer's instruction manual.
9.6 Turn on the sampler and allow it to establish run-temperature conditions. Record the flow
indicator reading and, if needed, the ambient temperature and barometric pressure. Determine
the sampler flow rate (actual m3/min) in accordance with the instructions provided in the
sampler manufacturer's instruction manual. NOTE- No onsite temperature or pressure
measurements are necessary if the sampler's flow indicator does not require temperature or
pressure corrections or if seasonal average temperature and average barometric pressure for
the sampling site are incorporated into the sampler calibration (see step 8.2.4). If individual or
daily temperature and pressure corrections are required, ambient temperature and barometric
pressure can be obtained by on-site measurements or from a nearby weather station.
Barometric pressure readings obtained from airports must be station pressure, not corrected
to sea level, and may need to be corrected for differences in elevation between the sampling
site and the airport.
9.7 If the flow rate is outside the acceptable range specified by the manufacturer, check for leaks,
and if necessary, adjust the flow rate to the specified setpoint. Stop the sampler.
9.8 Set the timer to start and stop the sampler at appropriate times. Set the elapsed time meter to
zero or record the initial meter reading.
9.9 Record the sample information (site location or identification number, sample date, filter
identification number, and sampler model and serial number).
9.10 Sample for 24+/- 1 hours.
9.11 Determine and record the average flow rate (Qa) in actual m3/min for the sampling period in
accordance with the instructions provided in the sampler manufacturer's instruction manual.
Record the elapsed time meter final reading and, if needed, the average ambient temperature
and barometric pressure for the sampling period (see note following set 9.6)
9.12 Carefully remove the filter from the sampler, following the sampler manufacturer's instruction
manual. Touch only the outer edges of the filter.
9.13 Place the filter in a protective holder or container (eg. petri dish, glassine envelope, or manila
folder).
9.14 Record any factors such as meteorological conditions, construction activity, fires or dust
storms, etc., that might be pertinent to the measurement on the filter information record.
9.15 Transport the exposed sample filter to the filter conditioning environment as soon as possible
for equilibration and subsequent weighing.
9.16 Equilibrate the exposed filter in the conditioning environment for at least 24 hours under the
same temperature and humidity conditions used for presampling filter equilibration (see 9.3).
9.17 Immediately after equilibration, reweigh the filter and record the postsampling weight with the
filter identification number.
8.0 Sampler Maintenance.
10.1 The PM10 Sampler shall be maintained in strict accordance with the maintenance procedures
specified in the sampler manufacturer's instruction manual.
9.0 Calculations.
11.1 Calculate the average flow rate over the sampling period corrected to EPA reference
conditions as Qstd. When the sampler's flow indicator is calibrated in actual volumetric units
(Qa), Qstd is calculated as:
Qstd=Qa*(Pav/Tav)(Tstd/Pstd)
Where:
Qstd = average flow rate at EPA reference conditions, std m3/min;
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