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US Coast Guard Command Instructions
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> Oil Spills - CI_16010_80144
Measurement Issues
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COMDTINST
16010.8
Oil Spills:
The
baseline
has
been
revised
based
on a
new
data analysis.
Hence,
the goal target for
FY99
has
also
changed
from the target in the
FY99
Performance
Plan.
The
baseline is established by a regression curve
obtained from several years of data.
Performance
is
measured
against a
selected year on the curve. Data on oil spilled is obtained from the
Coast
Guard
Marine Safety Information
System
(MSIS). Data on waterborne
shipments
of oil obtained from
Army
Corps
of
Engineers
"Waterborne
Commerce
Statistics." Oil spills of 1 million gallons or
more
are
excluded from data.
These
spills are extremely rare (less than
.1%
of
spills)
and
would
have an inordinate influence on statistical trends.
Only spills from regulated vessels
and
facilities are counted.
MSIS
data
is verified by field offices. Data is also
checked
during processing into
the analysis database.
Program
managers
also validate a
sample
of
MSIS
data against incident
case
records.
Confidence
in
measure
is moderate.
Plastics
and
Garbage
Debris:
The
baseline
has
been
revised
based
on a
new
data analysis.
Hence,
the goal target for
FY99
has
also
changed
from the
target in the
FY99
Performance
Plan.
The
baseline is established by a
regression curve obtained from several years of data.
Performance
is
measured
against a selected year on the curve.
1997
figure is a projection
based
on historical data (1990-96).
The
associated
measure
was
changed
from
"pounds
of debris" to
"number
of
marine
debris items" for better
measurement.
Data on debris items obtained from the Center for Marine
Conservation, "National Coastal
Cleanup
Results." A recent National
Marine Fisheries Service study corroborated
CMC
data trends.
Confidence
in the
measure
is moderate.
Pollution
Response:
This
measure
replaces the oil removal rate
measure
contained in previous
performance
plans. Attempts over the past 4 years
to
use
oil removal rates as a
measure
of
response
effectiveness presented
significant validity problems. Spill removal data is susceptible to bias
in the form of
underestimated
spill sizes
and
inflated removal
amounts.
Removal
estimates are
confounded
by the
dynamics
of weathering.
The
problems
that
make
removal rates a poor
performance
management
measure
have resulted in a reevaluation to develop a better indicator of
pollution
response
effectiveness
and
readiness. A multiple factor rating
system
for
this
purpose
continues to be developed.
The
system
will likely take the
form of a post-incident
assessment
of
preparedness
for the incident
and
performance
to mitigate the incident.
The
assessment
will assign a rating
(P1-5) similar to the Status of
Readiness
and
Training
System
(SORTS.)
It
should be ready for testing in FY99. An additional
measure
evaluating
the
effectiveness of federal
response
to spills over
1000
gallons is also
under development.
Domestic
Fisheries:
Data will be provided by
NMFS
through
each
of the
Regional Fisheries
Management
Councils' staffs for the
changes
in the
number
of listed species that improve in status from year to year. Data
will be verified by
NMFS
personnel.
56
Measurement
Issues
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