Document ID: EPA-HQ-OW-2004-0002-0635
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2004-11-30T05:00Z

QUESTIONS
YOUR
RESPONSE
1.
Number
of
CWISs:
2
2.
Brief
description
of
each
CWIS
(
e.
g.,
sea
chest,
simple
pipe):
Straight
pipe
in
wet
leg.
Intake
is
the
inlet
to
the
submerged
pump.

3.
Rough
dimensions
of
each
CWIS
and
indicate
whether
CWIS
has
existing
flange:
3
inch
dia
(
pump
inlet).
Cooling
water
is
taken
from
inside
a
platform
leg.
Sea
water
enter
the
leg
through
a
"
window"
which
is
a
hole
that
a
pipe
runs
through
that
is
not
sealed
to
the
pipe
(
i.
e.,
water
passes
through
the
hole
around
the
pipe).
Technically
the
sapce
through
which
the
water
enters
the
leg
is
the
CWIS.
However,
because
the
cross
sectional
area
of
the
window
minus
the
pipe
is
unknown,
the
calculations
below
assumes
the
pump
inlet
is
the
CWIS.

4.
Screen
type
(
e.
g.,
strainer,
wedge
wire)
with
mesh
size:
Strainer
5.
Total
daily
maximum
design
water
intake
volumn
of
each
CWIS:
Pump
"
B"
=
??
,
Pump
"
C"
=
100,800
Gal.

6.
Total
daily
water
intake
volume
of
each
CWIS
(
set­
up/
drilling):
100,800
Gal
7.
Total
daily
cooling
water
intake
volume
of
each
CWIS
(
set­
up/
drilling):
100,800
Gal
8.
Design
through
screen
velocity
of
each
CWIS
(
i.
e.,
Q=
V*
A)
(
set­
up/
drilling):
3.17
ft/
sec
9.
List
purposes
of
cooling
water
intake
(
e.
g.,
cool
crude
oil,
produced
water,
power
generators,
drill
pipe
brakes):
Cool
gas
10.
List
purposes
of
non­
cooling
water
intakes
(
e.
g.,
fire,
water,
hotel
loads)
other
than
ballast
water:
Used
as
flushing
and
mixing
agent
for
injection
well,
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):
Stainer
at
pick
up,
backflush
weekly
13.
Describe
measures
used
to
reduce
or
prevent
biofouling:
Back
flush
pump
weekly
14.
Describe
mitigation
measures
used
for
reducing
exotic
species
migration
through
ballast
water:
None
OCS
Lease
and
Block:
Platform
Name:
Bruce
Platform
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:
Granite
Point
Company:
Unocal