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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As part of the preparation for this project, a Category III Quality Assurance Project Plan (QAPP)<br />
was prepared and approved for the field campaigns. In addition, standard operating procedures<br />
were in place during the field campaigns.<br />
5.2 Assessment of DQI Goals<br />
The critical measurements associated with this project and the established data quality indicator<br />
(DQI) goals in terms of accuracy, precision, and completeness are listed in Table 5-2.<br />
Table 5-2. DQI Goals for Instrumentation<br />
Measurement<br />
Parameter<br />
Analysis Method Accuracy Precision<br />
Acceptance Criterion<br />
(%Bias/Recovery)<br />
Completeness<br />
(%)<br />
Methane PIC OP-TDLAS ±20% ±20% Not applicable 90<br />
Analyte PIC OP-FTIR: Nitrous Oxide<br />
Concentrations<br />
Ambient Wind<br />
Speed<br />
Ambient Wind<br />
Direction<br />
Distance<br />
Measurement<br />
R.M. Young Met heads postdeployment<br />
calibration in EPA<br />
Metrology Lab<br />
R.M. Young Met heads postdeployment<br />
calibration in EPA<br />
Metrology Lab<br />
±25%, ±15%, 10%* ±10% Not applicable 90<br />
±1 m/s ±1 m/s Not applicable 90<br />
±10º ±10º Not applicable 90<br />
Theodolite- Topcon ±1m ±1m Not applicable 100<br />
Beam angle Theodolite- Topcon ±0.1º ±0.1º Not applicable 100<br />
Mercury<br />
concentrations<br />
Lumex Mercury Analyzer ±25% ±25% Not applicable 90<br />
Total Mercury Frontier Geosciences Not applicable ±20% 50-150 90<br />
Organo- Mercury Frontier Geosciences Not applicable ±20% 50-150 90<br />
VOCs EPA Method TO-15 Not applicable ±20% 50-150 90<br />
* The accuracy acceptance criterion of ±25% is for pathlengths of less than 50m, ±15% is for pathlengths between 50 and<br />
100m, and ±10% is for pathlengths greater than 100m.<br />
5.2.1 DQI Check for Methane PIC Measurement with OP-TDLAS<br />
The Boreal <strong>Gas</strong>Finder 2.0 OP-TDLAS provides an R 2 value for each concentration<br />
measurement. The R 2 value is calculated by the internal software of the instrument, and is an<br />
indication of the similarity between the waveform of the sample gas and the reference cell gas.<br />
When the instrument detector receives the returning laser signal after it has passed through the<br />
sample beam path, it converts the signal to the shape of a specific waveform (sample waveform).<br />
The instrument also receives a similar laser signal after the laser has passed through the reference<br />
cell in the instrument (reference waveform). The two waveforms are then digitized and compared<br />
as two numeric arrays. The instrument software then performs a Linear Least Squares Regression<br />
for each measurement, to evaluate the similarity (R 2 ) between the sample and reference<br />
waveforms.<br />
5-2