
?
Need
to
return
call
by
/
at/
between
and
.
Signature:
.
Project
No.:
0172.02.005.050
 
DISTRIBUTION
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of
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Project
Name:
304(
m)

TELEPHONE
CALL
RECORD
Outgoing
Call
Date:
6/
27/
05
Time:
1:
00
PM
EST
Company
Name:
Norit
Americas
Marshall,
TX
Contact
Name:
Darrell
Silverthorne
Phone
No.:
(
903)
935­
4763
Name:
Audrey
Kasenge
Eastern
Research
Group
GENERAL
SUBJECT
:
Mercury
Releases
Reported
to
TRI
in
2000
TOPICS
DISCUSSED
AND
ACTION
TAKEN
On
Monday
June
27,
2005
I
called
Mr.
Silverthorne
to
ask
about
mercury
discharges
reported
to
TRI
in
2000.
I
asked
him
what
caused
the
significant
drop
in
mercury
discharges
from
2000
to
2002,
and
why
Norit
America's
current
NPDES
permit
did
not
require
monitoring
for
mercury.

Mr.
Silverthorne
informed
me
that
the
facility
changed
its
outfall
discharge
from
a
small
creek
to
a
large
river.
The
mercury
standards
for
the
large
river
were
much
less
stringent
than
those
for
the
small
creek,
and
therefore
since
the
facility
was
already
in
compliance
with
the
more
stringent
mercury
limits,
their
new
NPDES
permit
no
longer
required
monitoring
for
mercury.
Mr.
Silverthorne
also
indicated
that
there
may
have
been
a
sampling
error
during
the
mercury
sampling.
He
explained
that
during
the
mercury
sampling
there
were
several
hits
of
both
detects
and
non­
detects.
After
changing
their
sampling
technique
in
1999/
2000,
mercury
was
consistently
measured
as
non­
detect.
The
source
of
mercury
in
the
wastewater
comes
from
the
use
of
lignite,
which
contains
mercury,
as
a
raw
material.
