Appendix Table B.5.

Number of VOCs Above 10% Breakthrough Observed in Backup VOC Samples Obtained

Compound	Total Number of Samplesa	N > 10% Breakthrough
1,3-Butadiene	14	0
2-Methylpentane	14	2
2-Methylhexane	14	3
3-Methylhexane	14	1
2,3-Dimethylpentane	14	3
2,2,4-Trimethylpentane	14	2
Methylcyclohexane	14	2
Benzene	14	2
Toluene	14	0
m&p-Xylenes	14	1
o-Xylene	14	0
Ethylbenzene	14	0
Styrene	14	2
MTBE	14	1

Note: Breakthrough samples were lost in Miami, Houston, and Laredo because of the high levels of moisture in the air.