Quantifying Uncontrolled Landfill Gas Emissions from Two Florida ...

Figure 2-3. Schematic of measurement configuration at the control cell of Site #1
2.1.3 Background Measurements
Background methane concentration measurements were collected at Site #1 on February 21
using the OP-TDLAS instrument. The measurements were collected at a location south of the
bioreactor cell, upwind of the landfill cells at the site. The data collected were used to establish
an average background methane concentration at the site.
2.2 Optical Remote Sensing Measurements at Landfill Site #2
2.2.1 Control Cell
The control cell was located on the southern side of landfill Site #2 (see Figure 1-2). This cell
was referred to as the “control cell” because it was not being operated as a bioreactor cell.
However, the cell was still accepting waste during the time of the measurements. ORS
measurements were collected in this cell on February 24 and 25. Since the control cell was
accepting waste during the time of the measurements, it was not possible to deploy the
instrumentation over the entire footprint of the cell due to heavy machinery traffic associated
with landfill operations. The VRPM configuration consisted of a scanning OP-FTIR instrument,
a scanning OP-TDLAS instrument, and two vertical structures. The OP-FTIR was deployed in
the northwestern corner of the cell, the OP-TDLAS was deployed in the southeastern corner of
the cell, and the two vertical structures were deployed in the northeastern and southwestern
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