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Laboratory Results

Laboratory results of the natural gas samples collected about ten (10) feet downwind (Southwest) of the SS-25 well site are provided below.  Because these samples were collected near the area where the gas is being released into the air -- and, for safety reasons, not directly from the underground natural gas storage field itself -- the natural gas sampled was somewhat diluted in ambient air.  However, in order to estimate the amount of certain compounds in the natural gas being released, the SCAQMD used the ratio of methane (the major component of natural gas) to other compounds detected in one of the samples.  The results showed that there was approximately 7 parts per million (ppm) of Benzene, 10 ppm of Toluene and 5 ppm of Xylene present in the natural gas that was being released into the air.  These concentrations are consistent with the concentration of same compounds measured in the sample that SoCalGas collected as well. The benzene concentration is well within the ranges reported for natural gas.


 

Compound

SCAQMD
Canister
# 54178

SCAQMD
Canister
# 04335

Gas Co Canister

Methane in %1

5.5

0.5

2.2

Benzene in ppb2

400

<100

140

Toluene in ppb2

600

<100

230

Ethylbenzene in ppb2

<100

<100

< 39

m+p-xylene in ppb2

300

<100

< 160

o-xylene in ppb 2

<100

<100

< 39

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South Coast Air Quality Management District

21865 Copley Dr, Diamond Bar, CA 91765

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