Document ID: EPA-HQ-OW-2002-0049-0025
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:
November
21,
2002
Company
Name:
Brackett
Green
Street
Address:

City/
State/
ZIP:
Houston,
TX
Person
Contacted:
Trent
Gathright
Title:
Sales
Manager
Telephone
#:
281­
480­
7955
Talked
to
(
receptionist)
forwarded
to
Trent
Called
to
inquire
capital
&
O&
M
costs
of
dual
flow
screens
For
dual
flow
retrofits
the
relative
costs
compared
to
through
flow
traveling
screens
with
fish
handling
is
as
follows:
°
For
screen
well
depths
of
0
to
<
20
ft
add
15%
°
For
screen
well
depths
of
20
to
<
40
ft
add
10%
°
For
screen
well
depths
of
40
to
60
ft
add
5%

The
ability
to
retrofit
with
dual
flow
screens
particularly
for
wider
screens
is
site
specific.
Most
screen
wells
have
five
ft
of
open
space
parallel
to
flow
and
to
put
in
a
screen
that
would
reduce
screen
velocity
would
need
to
be
larger
than
5
ft
for
10
&
15
ft
through
flow
screens.
In
many
cases
it
is
possible
to
cut
out
the
front
part
of
the
concrete
deck
but
it
depends
on
if
there
is
enough
room
(
i.
e.,
there
is
not
something
in
the
way).

Regarding
O&
M
costs,
The
O&
M
costs
are
much
lower.
Annual
labor
goes
from
300
hrs
to
30
hours.
The
wash
water
flow
is
nearly
cut
in
half
and
the
spray
water
pressure
is
reduced
from
80­
120
psi
to
30
psi.
He
said
that
retrofits
can
pay
for
themselves
in
2
to
5
yrs.
He
will
send
some
example
cost
analyses.

Cost
for
lost
power
can
be
estimated
at
$
1,000
per
MW
per
day.
This
confirms
use
of
$
0.04/
Kwh,
since
1,000
X
0.04
X
24
=
$
960.