Document ID: EPA-HQ-OW-2002-0049-0174
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2003-03-19T05:00Z

316B
RULE
TELEPHONE
LOG
Name
of
Caller:
John
Sunda,
SAIC
Date:
September
30,
2002
Company
Name:
Cinergy
Street
Address:

City/
State/
ZIP:

Person
Contacted:
Ron
Frey
Title:
Sr
Engineer
and
Environmental
Mgr
Telephone
#:
513­
467­
5270
Called
to
ask
about
construction
details
and
O&
M
costs
of
the
passive
screen
retrofit
at
the
WH
Zimmer
Plant.

Screen
Data
Screens
have
0.123
inch
slots
48
inch
Diameter
182
inches
long
10,154
capacity
POA
63.4
%

Intake
Design
The
intake
was
originally
designed
with
a
flume
with
screens
traveling
in
the
flume.
It
is
oriented
such
that
it
is
angled
downstream
with
the
intent
that
debris
would
continue
downstream.
The
steel
wall
blocks
off
the
original
intake
opening.
He
said
the
cost
of
the
steel
was
not
high
maybe
$
10,000
to
20,000
not
including
labor.

Air
Backwash
System
Air
back
wash
frequency
is
usually
once
per
day
but
when
river
flow
rises
and
debris
increases
frequency
may
increase
to
the
point
whee
an
operator
is
there
24
hours
and
backwashes
as
frequently
as
possible.
These
conditions
may
last
several
weeks.

Installation
&
Downtime
He
said
they
had
the
luxury
of
taking
their
time
since
there
was
other
construction
work
ongoing.
The
retrofit
construction
took
about
6­
8
months
in
this
no
"
time
pressure"
scenario.
So
I
asked
for
him
to
provide
an
estimate
assuming
downtime
to
be
minimized.
He
said
it
would
reasonably
take
12
to
15
weeks
total
including
time
for
cleaning
and
any
dredging
of
shoreline
intake
area.
This
would
include
5­
6
weeks
for
installing
piping,
some
support
pilings
can
be
laid
ahead
of
time,
an
additional
5­
6
weeks
to
tie
in
piping
and
install
wall,
and
an
additional
2­
3
weeks
if
cleaning
or
dredging
of
the
intake
area
is
necessary.
A
more
aggressive
schedule
of
7­
9
weeks
would
be
possible
but
that
would
require
everything
to
occur
on
a
tight
schedule.
This
is
based
on
the
assumption
that
mobilization
and
work
occurs
on
schedule.
This
could
be
scheduled
to
occur
during
a
turbine
maintenance
shutdown
which
can
take
as
much
as
6
weeks.

O&
M
Costs
I
inquired
about
the
sizeable
O&
M
cost
estimates
provided
in
the
Offshore
Facility
Survey
they
completed.
Of
particular
interest
were
the
high
cleaning
costs.

He
said
that
up
to
twice
a
year
(
usually
spring
&
fall)
when
the
river
pool
rises
and
debris
including
leaves
becomes
prevalent
that
they
must
pay
divers
to
manually
clean
the
screens
($
55,000).
Also
they
are
starting
to
get
Zebra
Mussels
attaching
to
the
screens
and
that
removal
of
Zebra
Mussels
is
a
separate
job.
($
25,000)
He
did
note
that
some
of
these
costs
may
not
occur
as
frequently
as
annually
and
that
his
costs
may
represent
somewhat
of
an
overestimate
when
added
together.
He
said
that
sediment
build
up
is
sometimes
a
problem
and
that
the
$
30,000
figure
includes
costs
for
moving
sediment
from
around
screens.
We
agreed
that
his
situation
seems
to
include
several
problems
and
probably
represents
a
worst
case
situation
in
that
they
must
deal
with
sediment,
leaves,
and
Zebra
Mussels.

They
do
inject
biocide
periodically
in
intake
system
to
control
mussels
and
biofouling.
They
use
bromine.

We
discussed
Zebra
Mussels,
he
said
that
they
first
form
a
single
layer
inside
piping
and
other
surfaces,
and
will
form
a
second
layer
which
smothers
the
first
layer
and
eventually
sheets
of
mussels
as
large
as
the
palm
of
your
have
slough
off
and
end
up
plugging
oils
coolers
etc.