Document ID: EPA-HQ-OW-2004-0002-0199
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2004-11-29T05:00Z

1
MEMORANDUM
TO:
Kelly
Meadows,
Tetra
Tech
Inc.;
Shari
Goodwin,
Tetra
Tech
Inc.
FROM:
Faysal
Bekdash;
SAIC;
John
Sunda,
SAIC
DATE:
October
20,
2004
SUBJECT:
Intake
retrofit
case
studies
specific
to
Phase
III
facilities
SAIC
took
two
approaches
to
identify
possible
retrofit
case
studies
for
Phase
III
facilities.
One
was
to
contact
facilities
that
appeared
to
be
possible
candidates
based
on
information
from
the
316(
b)
industry
survey.
A
facility
list
and
spreadsheet
was
provided
to
SAIC
by
Tetra
Tech.
The
second
method
was
to
use
information
provided
by
wedgewire
screen
vendors.
This
analysis
identified
two
Phase
III
facilities
that
have
performed
a
retrofit
to
replace
an
original
intake
technology.

Survey
Data
Approach
SAIC
attempted
to
contact
18
manufacturers
and
electric
generators
to
clarify
that,
based
on
survey
responses,
the
facility
retrofitted
either
a
passive
intake,
fish
diversion,
or
fish
handling
system,
with
many
of
them
occurring
in
the
mid
1980s
to
late
1990s.
Twelve
facilities
were
unable
to
provide
a
response
for
a
variety
of
reasons
(
did
not
return
call,
incorrect
contact
information,
out
of
business,
or
required
written
correspondence).
Of
the
six
facilities
that
did
respond,
one
facility
performed
a
retrofit
that
did
not
involve
upgrading
existing
technology
such
as
screen
replacement.
In
this
case,
a
perforated
plate
was
replaced
by
wedgewire
T­
screens.

The
facilities
that
did
respond
to
the
calls
provided
information
regarding
down
time,
maintenance
frequency,
and
some
cost
information.
Most
facilities
agreed
that
down
time
to
maintain
or
replace
a
screen
is
not
an
issue.
Facilities
either
had
a
back­
up
source
of
water
or
carried
out
these
activities
during
scheduled
down
time.
Some
manufacturers,
such
as
sugar
refineries,
only
operate
for
a
few
months
per
year
and
therefore
have
plenty
of
time
to
perform
a
retrofit
without
affecting
production.

Vendor
Supplied
Information
Approach
Two
vendors
(
Hendricks
Screens
and
Johnson
Screens)
were
contacted
to
request
lists
of
recent
wedgewire
screen
installations.
While
most
of
the
facilities
were
for
small
intakes,
hydropower
dams,
or
water
treatment
plants,
one
large
intake
(
ten
36
inch
wedgewire
T­
screens)
was
for
the
Tosco
Refinery
in
Rodeo,
CA.
Down
time
was
not
an
issue
at
the
Tosco
Refinery
because
the
new
intake,
which
was
constructed
adjacent
to
the
old
one,
was
connected
to
the
existing
pumphouse
one
pipe
(
out
of
five)
at
a
time.