Document ID: EPA-HQ-OW-2004-0002-0629
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2004-11-30T05:00Z

QUESTIONS
YOUR
RESPONSE
1.
Number
of
CWISs:
3
(
1
for
Gas
Cooling,
2
Source
Pumps,
for
vacuum
pump
seal
water/
cooling
(
waterflood
pumps).
Vacuum
pump
water
is
simply
a
slip
stream
off
the
water
flood
system.
Only
one
vacuum
pomp
runs
at
a
time.

2.
Brief
description
of
each
CWIS
(
e.
g.,
sea
chest,
simple
pipe):
Simple
pipe
to
wet
leg
(
i.
e.
water
in
the
leg).
Water
is
allowed
into
leg
through
a
orifice
where
a
J­
ube
used
to
be.
The
orifice
is
technically
the
CWIS.

3.
Rough
dimensions
of
each
CWIS
and
indicate
whether
CWIS
has
existing
flange:
Approximately
12
inches
4.
Screen
type
(
e.
g.,
strainer,
wedge
wire)
with
mesh
size:
Unknown,
probably
not.

5.
Total
daily
maximum
design
water
intake
volumn
of
each
CWIS:
Total
water
through
12
inch
orifice
equals
the
sum
of
the
gas
cooling
water
plus
waterflood
source
pump.
Not
all
of
the
water
is
used
for
cooling
but
would
be
difficult
to
ratio.
Gas
Cooling
=
??
Source
Pumps
2
each
at
30,000
BPD
6.
Total
daily
water
intake
volume
of
each
CWIS
(
set­
up/
drilling):
Gas
Cooling
plus
30000
BPD
7.
Total
daily
cooling
water
intake
volume
of
each
CWIS
(
set­
up/
drilling):
Gas
Cooling
plus
approximately
30000
BPD
8.
Design
through
screen
velocity
of
each
CWIS
(
i.
e.,
Q=
V*
A)
(
set­
up/
drilling):
Assumes
30000
BPD
through
12
inch
orifice.
2.47
ft/
sec
9.
List
purposes
of
cooling
water
intake
(
e.
g.,
cool
crude
oil,
produced
water,
power
generators,
drill
pipe
brakes):
Cool
gas,
seal
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
14.
Describe
mitigation
measures
used
for
reducing
exotic
species
migration
through
ballast
water:
NA
OCS
Lease
and
Block:
Platform
Name:
Anna
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:
Company:
Unocal