Attachment
3
Response
to
Questions
Chevron
Pascagoula
Refinery
Dioxin
Your
company
reported
to
TRI
that
you
released
0.086
grams
of
dioxin
and
dioxin­
like
compounds
to
surface
water
(
Mississippi
Sound)
in
2002.
Your
company
reported
that
the
basis
of
estimate
for
this
discharge
was
"
other
approaches".

Could
you
please
explain
how
the
reported
discharge
was
estimated?

The
dioxin
release
to
water
in
the
2002
TRI
report
for
the
Chevron
Pascagoula
Refinery
is
based
on
limited
sampling
conducted
in
2001
at
the
refinery's
catalytic
reformer
units.
We
developed
a
site­
specific
mass
emission
factor
using
the
analyses
and
the
volume
of
regeneration
wastewater
routed
to
the
refinery's
effluent
system.
The
2002
reportable
mass
amount
is
equal
to
the
emission
factor
times
the
number
of
regenerations
in
2002.

In
2002,
did
your
company
ever
analyze
any
wastewater
for
the
dioxin
congeners
listed
below,
either
an
in­
plant
stream,
such
as
catalytic
reformer
regeneration,
or
the
final
discharge
to
Mississippi
Sound?

No
sampling
was
performed
in
2002.

If
so,
were
any
of
the
dioxins
ever
detected?
If
so,
which
congeners?
How
did
your
company
determine
the
wastewater
flow
associated
with
the
dioxin
discharges
in
order
to
calculate
the
reported
grams
discharged?

See
response
to
previous
question.

If
your
company
did
not
collect
any
monitoring
data,
how
was
the
dioxin
distribution
determined?

The
2002
reported
dioxin
distribution
is
the
congener
distribution
from
the
limited
sampling
conducted
in
2001
(
see
response
to
first
question
above).

Polycyclic
Aromatic
Compounds
(
PACs)
Your
company
reported
to
TRI
that
you
released
110
pounds
of
polycyclic
aromatic
compounds
to
surface
water
(
Mississippi
Sound)
in
TRI
in
2002.
Your
company
reported
that
the
basis
of
estimate
for
this
discharge
was
"
other
approaches".

Could
you
please
explain
how
the
reported
discharge
was
estimated?
We
based
the
Polycyclic
Aromatic
Compounds
(
PACs)
release
to
water
in
the
2002
TRI
report
for
the
Chevron
Pascagoula
Refinery
on
the
total
volume
of
water
discharged
and
EPA's
BAT
effluent
guidelines
estimate
for
PAC's
contained
in
refinery
effluent
water
[
Development
Document,
EPA
440/
1­
82/
014,
October
1982].

In
2002,
did
your
company
ever
analyze
any
wastewater
for
any
of
the
polycyclic
aromatic
compounds
listed
below,
either
an
in­
plant
stream,
such
as
catalytic
reformer
regeneration,
or
the
final
discharge
to
Mississippi
Sound?

No.

If
so,
were
any
polycyclic
aromatic
compounds
ever
detected?
If
so,
which
compounds?
How
did
your
company
determine
the
wastewater
flow
associated
with
the
polycyclic
aromatic
compound
discharges
in
order
to
calculate
the
reported
pounds
discharged?

Not
applicable,
see
response
to
previous
question.
