Document ID: EPA-HQ-OW-2004-0002-0637
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2004-11-30T05:00Z

QUESTIONS
YOUR
RESPONSE
1.
Number
of
CWISs:
2
(
one
"
inside"
the
leg
and
one
"
outside"
the
leg).
The
outside
pipe
is
one
of
two
pipes
that
run
inside
a
48"
pipe
cut
in
half
long
ways
and
welded
to
the
leg.
One
is
cooling/
source
water
one
is
firewater.
2.
Brief
description
of
each
CWIS
(
e.
g.,
sea
chest,
simple
pipe):
Simple
pipe.

3.
Rough
dimensions
of
each
CWIS
and
indicate
whether
CWIS
has
existing
flange:
Outside
approximately
12
inch,
inside
approximately
14
inches.

4.
Screen
type
(
e.
g.,
strainer,
wedge
wire)
with
mesh
size:
Outside 
nothing,
Inside 
unsure.

5.
Total
daily
maximum
design
water
intake
volumn
of
each
CWIS:
800
to
1000
gpm
both
inside
and
outside.
Typically
run
one
at
a
time
6.
Total
daily
water
intake
volume
of
each
CWIS
(
set­
up/
drilling):
1000
gpm
typical
7.
Total
daily
cooling
water
intake
volume
of
each
CWIS
(
set­
up/
drilling):
1000
gallons
8.
Design
through
screen
velocity
of
each
CWIS
(
i.
e.,
Q=
V*
A)
(
set­
up/
drilling):
12
inch
=
2.82
ft/
sec
14
inch
=
2.07
ft/
sec
9.
List
purposes
of
cooling
water
intake
(
e.
g.,
cool
crude
oil,
produced
water,
power
generators,
drill
pipe
brakes):
Cool
gas,
engines
10.
List
purposes
of
non­
cooling
water
intakes
(
e.
g.,
fire,
water,
hotel
loads)
other
than
ballast
water:
Waterflood,
firewater,
backwash
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:
Monopod
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