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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Table 3-10. Results of C1 to C6 and permanent gases by GC/FID/TCD <strong>from</strong> Site #1<br />
Analyte: Methane Ethane Propane Butane Pentane Hexane O2 N2 CO2<br />
Sample Type Sample ID (%) (ppmv) (ppmv) (ppmv) (ppmv) (ppmv) (%) (%) (%)<br />
<strong>Landfill</strong> <strong>Gas</strong> F-2 6.1 8.6 3.5 3.4 ND ND 20.1 79 ND<br />
<strong>Landfill</strong> <strong>Gas</strong> F-3 33.2 9.5 11.7 5.5 7.5 12.6 10.6 39.1 25.7<br />
<strong>Landfill</strong> <strong>Gas</strong> F-4 15.5 5.9 6.1 4.4 7 ND 17.7 66.8 19.6<br />
Nitrogen Blank F-5 0.0032 ND ND ND ND ND 4 101 ND<br />
Table 3-11. Results of Method 25-C analysis <strong>from</strong> Site #1<br />
Analyte: Methane CO2 NMOC Mass Conc.<br />
Sample Type Sample ID (%) (%) (ppmv) (mg/m 3 )<br />
<strong>Landfill</strong> <strong>Gas</strong> F-2 64.4 46.1 2576 1286<br />
<strong>Landfill</strong> <strong>Gas</strong> F-3 59.4 43.2 2782 1389<br />
<strong>Landfill</strong> <strong>Gas</strong> F-4 58.2 42.2 2677 1337<br />
Nitrogen Blank F-5 ND ND ND ND<br />
The results in Table 3-10 show a possible leak during the analysis, and should be considered as<br />
suspect data. Concentrations of O2, methane, and CO2, are not typical of a mature gas producing<br />
landfill, as O2 concentrations should be less than 2 percent, methane greater than 50 percent, and<br />
CO2 greater than 35 percent. The sum of the concentrations for methane, O2, N2, and CO2 also<br />
exceed 100% in all cases due to problems in the analysis. In response to these questionable<br />
results, additional landfill gas measurements were taken during the October 2007 field campaign.<br />
These results are presented in Section 3.3 of this document.<br />
The results shown in Table 3-11 appear to be the most valid results for methane and CO2 because<br />
this method was specifically designed for measuring landfill gas concentrations. With the<br />
exception sample F-2, the sum of the concentrations for methane and CO2 more closely balance<br />
to 100% than the results presented in Table 3-10.<br />
3.1.5 Total Mercury Measurements<br />
Total mercury concentrations in the landfill gas <strong>from</strong> Site #1 ranged <strong>from</strong> 4958 to 5148 ng/m 3<br />
with an average of 5022 ng/m 3 for all of the samples. Matrix spike recovery for the total mercury<br />
sample was 98.2 percent. Table 3-12 presents the total mercury concentration data <strong>from</strong> Site #1.<br />
3-16
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