Geoscience Reference
In-Depth Information
Fig. 17.26 Benzene concentrations from 1979 and 1996 at a polluted groundwater site situated
under an industrial facility in a coastal area of United States (Suarez and Rifai
2002
). Reprinted
from Suarez and Rifai (
2002
). Copyright 2002 with permission of John Wiley and Sons
Fig. 17.27 Xylene concentrations from 1979 and 1996 at a polluted groundwater site situated
under an industrial facility in a coastal area of the United States (Suarez and Rifai
2002
).
Reprinted from Suarez and Rifai
(2002)
. Copyright 2002 with permission of John Wiley and Sons
main contaminants. Sulfate concentrations that ranged from 25 to 40 mg/L, and
methane presence concurrent with depletion of dissolved oxygen, indicate anaerobic
degradation. Dissolved oxygen is low in the source zone and increases to the edge of
the plume, showing aerobic degradation. Under no attenuation and based only on
hydrological parameters, the calculated maximum plume distance from the spill
after 30 years could reach about 11,000 m. However, the plume in the present form
has extended only about 170 m from its source. Naidu et al. (
2012
) attribute this
difference
to
biodegradation,
which
was
confirmed
by
the
presence
of
