NOTE
SUBJECT:
Consultation
with
Missouri
Department
of
Transportation
TO:
File
FROM:
Stephen
Hoffman
DATE:
2/
27/
06
Mark
Doolan
of
EPA
Region
6
indicated
that
EPA
should
contact
Ms.
Beth
Schaller
of
the
Joplin
Office
of
the
Missouri
Department
of
Transportation
since
she
had
been
working
with
Mark
on
the
use
of
chat
in
transportation
projects.
On
September
15,
2005,
I
called
Ms
Schaller
who
indicated
that
the
state
had
published
specifications
for
the
use
of
chat
in
asphalt.
She
indicated
that
limits
on
lead
concentrations
had
been
set
at
not
exceeding
500
ppm.
Ms
Schaller
also
indicated
that
chat
had
been
used
in
concrete
but
there
was
such
use
in
the
state
at
present.
She
also
indicated
that
virtually
all
of
the
chat
used
in
transportation
was
used
as
aggregate
in
hot
mix
asphalt.
There
is
some
interest
in
Missouri
in
using
unencapsulated
chat
as
road
base.
