Quantifying Uncontrolled Landfill Gas Emissions from Two Florida ...
Quantifying Uncontrolled Landfill Gas Emissions from Two Florida ...
Quantifying Uncontrolled Landfill Gas Emissions from Two Florida ...
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was aligned on the mirror targets in the configuration, the scanner positions drifted after a short<br />
period of time due to slight movement of the scanner base, and eventually the instrument was<br />
completely misaligned on all mirrors. Consequently, it was necessary to stop data acquisition,<br />
and re-align the instrument on all mirrors in the configuration. This problem was especially<br />
evident along the long VRPM configuration, located along the southern boundary of the cell.<br />
Due to this problem, there are limited ORS data <strong>from</strong> this survey, especially data <strong>from</strong> the long<br />
OP-TDLAS configuration located along the southern boundary of the cell. In fact, data was<br />
collected along only the longest surface beam path of this configuration (mirror target located at<br />
the base of the vertical structure) in order to obtain enough information to estimate the methane<br />
flux value along this VRPM plane. <strong>Emissions</strong> data presented in this section are <strong>from</strong> two<br />
surveys. The flux values presented in the tables in this section represent a moving average of<br />
three measurement cycles, where a cycle is defined as data collected along each measurement<br />
path in the configuration. The time of the flux measurements presented in the tables represents<br />
the midpoint time of the averaging period, where the averaging period is approximately 15<br />
minutes. Figure 3-1 presents a summary of the actual measurement configurations used in the<br />
cell, as well as the measurement results <strong>from</strong> the first survey conducted at 4:00 p.m. Figure 3-2<br />
presents the measurement results <strong>from</strong> the second survey conducted at 5:00 p.m. The figures<br />
depict the average calculated methane flux values along each VRPM measurement plane during<br />
each survey. The blue arrow depicts the prevailing wind values during the time of the<br />
measurements.<br />
Figure 3-1. Summary of ORS measurements <strong>from</strong> the 4:00 pm survey of the control cell of<br />
Site #1<br />
3-2