MEMORANDUM
TO:
304(
m)
Record
(
EPA
Docket
Number
OW­
2004­
0074)

FROM:
Cortney
Itle,
ERG
DATE:
August
23,
2004
SUBJECT:
TRI
and
PCS
Database
Changes
Following
the
initial
screening­
level
review
of
PCS
and
TRI
data,
ERG
conducted
additional
data
quality
reviews
of
reported
pollutant
discharges
for
certain
top
ranking
industries
and
facilities.
These
reviews
identified
both
misreported
and
miscalculated
data,
including:

°
Adjustments
to
SIC
codes
associated
with
reported
discharges
(
affecting
the
point
source
category
or
industry
to
which
the
pollutant
loads
are
attributed);

°
Revisions
to
TWFs
used
for
certain
TRI
chemical
categories
(
e.
g.,
dioxin,
PACs)
to
better
reflect
the
specific
chemicals
discharged
by
a
specific
industry;

°
Adjustments
to
the
point
source
category/
SIC
crosswalk
to
eliminate
or
minimize
double
counting
of
pollutant
loads
between
industry
categories;
and
°
Facility­
and
pollutant­
specific
adjustments
to
reflect
misreported
or
miscalculated
pollutant
loadings.

Previous
adjustments
to
the
PCSLoads2000
and
TRIReleases2000
databases
are
documented
in
Development
of
PCSLoads2000
(
DCN
00620)
and
Evaluation
of
RSEI
Model
Runs
(
DCN
00618).
The
attached
tables
summarizes
changes
made
to
PCSLoads2000
and
TRIReleases2000
since
the
completion
of
those
reports.
