Document ID: EPA-HQ-OW-2004-0002-0638
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2004-11-30T05:00Z

QUESTIONS
YOUR
RESPONSE
1.
Number
of
CWISs:
3
2.
Brief
description
of
each
CWIS
(
e.
g.,
sea
chest,
simple
pipe):
J­
Tube
with
pump
inside 
Simple
pipe
3.
Rough
dimensions
of
each
CWIS
and
indicate
whether
CWIS
has
existing
flange:
16
inch
diameter
pipe
with
flange.

4.
Screen
type
(
e.
g.,
strainer,
wedge
wire)
with
mesh
size:
grating
at
flanges,
potentially
mesh
screen
at
bump
inlet.

5.
Total
daily
maximum
design
water
intake
volumn
of
each
CWIS:
72000
barrels/
day
per
CWIS
6.
Total
daily
water
intake
volume
of
each
CWIS
(
set­
up/
drilling):
50000
barrels
per
day 
typically
we
run
2
of
the
three.

7.
Total
daily
cooling
water
intake
volume
of
each
CWIS
(
set­
up/
drilling):
40000
used
for
cooling,
the
other
10000
to
waterflood
8.
Design
through
screen
velocity
of
each
CWIS
(
i.
e.,
Q=
V*
A)
(
set­
up/
drilling):
2.31
ft/
sec
based
on
50000
barrels
per
day
and
16
inch
pipe
opening.

9.
List
purposes
of
cooling
water
intake
(
e.
g.,
cool
crude
oil,
produced
water,
power
generators,
drill
pipe
brakes):
Actual
cooling
water
is
fresh
water
in
a
closed
system.
The
sea
cooling
water
is
used
in
a
heat
exchanger
to
cool
the
fresh
water.

10.
List
purposes
of
non­
cooling
water
intakes
(
e.
g.,
fire,
water,
hotel
loads)
other
than
ballast
water:
waterflood,
firewater
11.
Total
volume
of
water
intake
for
ballasting,
duration
of
ballast
intake,
and
through
screen
velocity
of
ballast
intake:
NA
12.
Describe
mitigation
measures
used
for
reducing
impingement
and
entrainment
of
aquatic
organisms
(
e.
g.,
sea
chest
screens,
strainers):
None
13.
Describe
measures
used
to
reduce
or
prevent
biofouling:
None
OCS
Lease
and
Block:
Platform
Name:
Steelhead
COOLING
WATER
INTAKE
STRUCTURE
(
CWIS)
INFORMATION
The
following
questions
apply
to
cooling
water
intake
structure(
s)
at
oil
and
gas
extraction
facility.
If
you
own
more
than
one
facilty,
please
copy
the
questions
and
answer
separately
for
each
facility.

Prospect
or
Field
Name:
Gas
Sands
Company:
Unocal
14.
Describe
mitigation
measures
used
for
reducing
exotic
species
migration
through
ballast
water:
NA