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The AAPG/Datapages Combined Publications Database
Environmental Geosciences (DEG)
Abstract
DOI: 10.1046/j.1526-0984.2001.84003.x
MTBE
Soil
Concentrations Relative to Other Gasoline Constituents at Contaminated Sites


YUE RONG
Environmental Specialist California Regional Water Quality Control Board, Los Angeles Region, 320 West 4th Street, Suite 200, Los Angeles, CA 90013
ABSTRACT
This study describes the results of a statistical analysis on methyl
tertiary butyl ether (MTBE) concentration distributions in soil
and groundwater and MTBE relative to other gasoline constituents
in
soil
based on data collected in Los Angeles, California.
The MTBE
soil
concentration data are studied in two aspects.
The first aspect involves MTBE concentration in
soil
as it relates
to MTBE groundwater concentration and
soil
type at individual
sites. The second involves the correlation between MTBE
and other gasoline constituents (benzene, toluene, ethyl-benzene,
xylenes [BTEX], and total petroleum hydrocarbons as gasoline
[TPHg]) in
soil
at individual sites and at particular
soil
boring locations, respectively. The results of statistical analyses
indicate that the MTBE concentration in
soil
correlated poorly
with the underlying groundwater concentration and
soil
type.
There was no statistically significant difference in MTBE
soil
concentration between types of soils. MTBE
soil
concentration
also correlated poorly with BTEX and TPHg, whereas BTEX
and TPHg in
soil
correlated well with one another. Despite the
generally poor correlation between MTBE and other gasoline
constituents at individual sites, good correlation was observed
between MTBE and BTEX based on data obtained at individual
soil
borings. In particular, a correlation coefficient of 0.82 was
observed between MTBE and BTEX at 13 of the 28
soil
borings
studied. Uncertainties associated with the data used for analyses
are assessed to pinpoint the shortcomings of the data analysis
and to enlighten future studies.
INTRODUCTION
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