NOTE
SUBJECT:
Consultation
with
Ash
Grove
Cement
TO:
FILE
FROM:
Stephen
Hoffman
DATE:
2/
27/
06
The
purpose
of
this
note
is
to
document
consultation
with
Ash
Grove
Cement
Company
reagrding
the
use
of
chat
in
cement.

On
October
12,
2005
I
called
Mr.
Michael
Harrell
of
Ash
Grove
Cement
to
discuss
the
use
of
chat
in
cement.
Mr
Harrell
indicated
that
for
a
three
year
period
starting
in
2001
Ash
Grove
used
chat
as
a
silica
substitute
in
the
manufacture
of
cement.
Ash
Grove
did
not
conduct
TCLP
or
SPLP
tests
of
the
chat
cement.
Ash
Grove
used
50,000
tons
of
chat
in
2001,
120,000
tons
of
chat
in
2002,
and
50,000
tons
in
2003.
Mr
Harrell
indicated
that
all
of
the
chat
amended
cement
passed
the
ASTM
standards
for
cement.
Ash
Grove
does
conduct
TCLP
tests
of
its
cement
kiln
dusts
every
24
hours.
The
use
of
chat
was
discontinued
because
it
was
necessary
to
grind
the
chat
and
that
grinding
was
causing
unusual
wear
on
equipment
since
it
is
so
hard.
Ash
Grove
was
able
to
find
cheaper
sources
of
silica
than
chat.
