Document ID: EPA-HQ-OW-2004-0002-0040
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2004-11-23T05:00Z

March
12,
2004
­
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23
Offshore
and
Coastal
Oil
and
Gas
Extraction
Facilities
Seawater
Intake
Structure
Modification
Cost
Estimate
Caisson
and
Simple
Pipe
Intakes
I.
Introduction
EPA
has
identified
Caisson
and
Simple
Pipe
seawater
intakes
as
intake
structures
commonly
used
by
Offshore
and
Coastal
Oil
and
Gas
Extraction
Facilities
(
OCOGEFs).
This
type
of
intake
structure
is
typical
for
fixed
installations
such
as
platforms
but
also
is
used
on
a
large
number
of
jack­
ups
(
mobile
facility).
Other
mobile
offshore
drilling
units
(
MODUs)
such
as
semisubmersibles
drill
barges,
submersibles
and
drill
ships
use
other
intake
structures
known
as
sea
chests.
Fixed
platforms
and
jack­
ups
are
by
far
the
most
common
OCOGEFs
currently
operating
in
the
Gulf
of
Mexico.

The
intent
of
this
analysis
is
to
develop
cost
estimates
for
new
and
existing
OCOGEFs
to
reduce
impingement
and/
or
entrainment
consistent
with
requirements
of
the
proposed
Phase
III
316(
b)
rule.
One
of
the
key
assumptions
in
this
study
for
existing
facilities
is
that
the
intake
structure
is
off
line
for
routine
maintenance.
No
allowances
have
been
made
for
production
losses
that
may
be
associated
with
the
intake
structure
being
taken
out
of
service
for
this
work.

The
capital
and
O
&
M
costs
estimated
in
this
report
are
incremental
costs
for
a
facility.
A
10%
engineering
and
10%
contingency
has
been
included
in
the
cost
estimates.
An
allowance
of
6%
of
the
capital
cost
has
been
allowed
for
annual
parts
replacement
costs.
The
estimates
for
inspection
and
cleaning
periods
have
been
based
on
vendor
data
and
data
from
operators
of
similar
equipment
in
high
marine
growth
areas.

The
primary
modification
configurations
that
have
been
costed
are
as
follows:

1.
Install
a
new
fine
mesh
screen
(
cylindrical
or
tee)
at
the
base
of
the
intake,

2.
Install
a
velocity
cap
at
the
base
of
the
intake.

There
are
a
large
number
of
possible
design
variations
within
these
two
configurations
(
particularly
fine
mesh
screen
design).
However,
for
simplicity,
this
estimate
will
be
based
on
proprietary
equipment
where
possible.
Details
of
the
cost
estimates
presented
in
this
report
are
in
Appendix
A.

II.
Technologies
and
Options
A.
Passive
Intake
Screens
Passive
intake
screens
covers
the
whole
range
of
static
screens
that
act
as
a
physical
barrier
to
fish
entrainment.
March
12,
2004
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These
barriers
include:
 
Simple
mesh
over
an
open
pipe
end
(
caisson
or
simple
intake
pipe)
with
a
suitably
low
face
velocity
to
prevent
impingement,
 
Grille
or
mesh
spanning
an
opening
(
as
used
on
sea
chest)
with
a
suitably
low
face
velocity
to
prevent
impingement
and
 
Cylindrical
and
Tee
Wedge
Wire
Screens
designed
for
the
purpose
of
protecting
fish
stocks
(
suitable
for
caissons
or
simple
intake
pipes
but
not
sea
chests).

Passive
intake
screens
are
very
commonly
used
throughout
industry
and
commercially
available
products
are
readily
available.

Tee
Screen
(
Johnson
Screens)

Fine
mesh
wedge
wire
screens
(
5mm)
have
been
identified
(
TDD
2001
pp
5­
7)
as
having
potential
to
prevent
both
entrainment
and
impingement.

The
main
drawback
in
implementing
this
fish
barrier
solution
is
that
the
screens
are
prone
to
blockages
as
a
result
of
bio­
fouling.
Since
this
type
of
equipment
is
so
common,
an
investigation
into
anti
bio­
fouling
technology
is
presented
below.

Due
to
the
success
of
passive
intake
screens
at
many
installations
around
the
world,
this
type
of
technology
is
a
suitable
fish
barrier
for
use/
retro
fit
on
OCOGEFs
and
the
Seafood
Processing
Vessels.

B.
Velocity
Caps
A
velocity
cap
is
a
device
that
is
placed
over
vertical
inlets
at
offshore
intakes.
This
cover
converts
vertical
flow
into
horizontal
flow
at
the
entrance
of
the
intake.
The
device
works
on
the
premise
that
fish
will
avoid
rapid
changes
in
horizontal
flow.
In
general,
velocity
caps
have
been
installed
at
many
offshore
intakes
and
have
been
successful
in
minimizing
impingement
(
TDD
2001).
March
12,
2004
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Image
from
Passive
Screening
at
Surface
Water
Intakes
(
Fournier
P.
1983)

C.
Modification
of
Intake
Location
Beyond
design
alternatives,
a
facility
may
able
to
locate
their
CWIS
in
areas
that
minimize
entrainment
and
impingement
(
compared
to
conventional
onshore
locations).
It
is
well
known
that
there
are
certain
areas
within
every
water
body
with
increased
biological
productivity,
and
therefore
where
the
potential
for
entrainment
and
impingement
of
organisms
is
higher
(
TDD
2001).

In
oceans,
near
shore
coastal
waters
are
generally
the
most
biologically
productive
areas.
The
euphotic
zone
(
zone
of
photosynthetic
available
light)
typically
does
not
extend
beyond
the
first
100
meters
(
328
feet)
of
depth.
Therefore,
near
shore
waters
are
generally
more
productive
due
to
photosynthetic
activity,
and
due
to
the
input
from
estuaries
and
run­
off
of
nutrients
from
land
(
TDD
2001).

This
technology
may
be
implemented
by
adding
an
extension
to
the
bottom
of
an
existing
intake
to
relocate
the
opening.
Alternatively,
an
operator
may
be
able
to
justify
that
the
existing
intake
location
is
already
in
an
area
of
low
impact.

In
order
to
identify
low
impact
areas,
an
environmental
study/
assessment
is
required
to
be
undertaken
at
the
facility.
The
costs
for
this
study
have
not
been
estimated
at
this
time.

The
costs
for
installing
deeper
intakes
on
new
facilities
with
cooling
water
intakes
have
been
estimated.

The
cost
for
modifying
existing
structures
with
deeper
intakes
will
be
significantly
greater
than
the
equipment
cost
of
screens
and
velocity
caps.
This
is
due
to
the
greater
dive
depths
and
durations
that
would
be
required
to
modify
and
install
the
proposed
modifications.
As
such,
the
cost
of
relocating
existing
intakes,
in
order
to
withdraw
cooling
water
from
low
impact
areas
has
not
been
estimated
in
this
report.

This
technology
has
the
potential
benefit
for
existing
facilities
with
deep
or
very
deep
intake
structures.
Undertaking
an
environmental
study
may
prove
that
additional
physical
modifications
are
not
required.
March
12,
2004
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D.
Localized
Pipe
Enlargement
An
enlargement
(
or
bell
opening)
of
the
intake
pipe
at
the
opening
into
the
ocean
will
reduce
the
inlet
velocity
and
reduce
impingement
against
the
intake
screen.
During
the
previous
phase
of
this
work,
(
See
Task
1
Report,
2003)
no
technologies
were
identified
using
low
inlet
velocity
alone
without
an
intake
screen
to
protect
fish
stocks.
As
such,
the
technology
of
a
local
pipe
enlargement
and
the
fine
mesh
screen
technology
as
described
above
are
essentially
the
same.
Since
the
fine
mesh
screen
technology
is
readily
available
in
the
market,
a
cost
estimate
for
a
pipe
enlargement
with
an
integral
screen
has
not
been
presented
here.

E.
Use
of
Compressed
Air
(
Air
Sparges)

The
use
of
compressed
air
(
air
sparges)
to
physically
remove
bio
matter
from
a
screen
face
is
commonly
used
by
the
industry.
It
is
particularly
useful
when
drifting
seaweed
or
rubbish
(
such
as
plastic
bags)
impinges
on
the
screen
face.

This
is
a
suitable
technology
in
most
marine
environments.
In
situations
where
there
are
prolific
marine
organisms
that
may
grow
on
the
screen
surface
such
as
mussels
(
zebra
mussels),
corral
or
seaweed
growth,
and
further
methods
may
need
to
be
taken
to
protect
the
screen.
Use
of
alternate
materials
of
construction
(
refer
below)
is
one
such
method.

Air
Sparging
a
Tee
Screen
(
Johnson
Screens)

F.
Use
of
Cu­
Ni
Alloy
Screens
Alloys
of
copper
and
nickel
have
been
found
to
limit
marine
growth
on
a
submerged
surface.
These
alloys
are
used
in
the
manufacture
of
screen
surfaces
to
prevent
problems
with
invasive
marine
growth.

Johnson
Screens
offer
screens
manufactured
from
"
Z
Alloy"
(
90/
10
CuNi).
Note:
This
material
is
commonly
used
for
other
sea
water
equipment
(
such
as
in
plate
type
heat
exchangers).
March
12,
2004
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23
Z
Alloy
Product
Demonstrations
from
Johnson
Screens
This
technology
has
proven
to
be
suitable
for
seawater
fabricated
screen
applications.

III.
Existing
Configurations
and
Assumptions
A.
Caisson
Pumping
Arrangement
A
caisson
(
as
referred
to
in
this
analysis)
is
simply
a
steel
pipe
attached
to
a
fixed
structure
that
extends
from
an
operating
area
down
some
distance
into
the
water.
It
is
used
to
provide
a
protective
shroud
around
another
process
pipe
or
pump
that
is
lowered
into
the
caisson
from
the
operating
area.
Please
refer
to
the
figure
below
for
a
generic
caisson
installation.

A
caisson
to
house
seawater
intake
equipment
is
a
very
common
arrangement
used
by
OCOGEFs.
Typical
equipment
installed
in
the
caisson
may
be
a
simple
suction
pipe,
submersible
pump
and
discharge
pipe
or
a
shaft
driven
borehole/
vertical
turbine
pump.

All
caisson
arrangements
have
the
similarity
that
seawater
is
drawn
into
a
single
opening
at
the
bottom
of
the
caisson.
Also,
since
the
caisson
typically
houses
the
seawater
pump
and
pipe,
the
caisson
is
typically
large
in
diameter
compared
to
the
seawater
suction/
discharge
pipework.
March
12,
2004
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Generic
Caisson
Arrangement
B.
Simple
Intake
Pipe
Pumping
Arrangement:

A
simple
intake
pipe,
as
the
name
suggests,
is
a
pipe
that
is
open
ended
into
the
water.
A
pump
will
draw
water
up
through
the
pipe
for
distribution
as
required
by
the
process.
These
systems
generally
include
a
strainer
to
protect
the
pump
and,
if
the
pump
is
above
water
level,
a
non­
return
valve
(
foot
valve)
to
help
keep
the
system
primed.

Generic
Simple
Pipe
Arrangement
Caisson
Sea
Level
Sea
Floor
Platform
Structure
Working
Area
Simple
Pipe
Sea
Level
Sea
Floor
Platform
Structure
Working
Area
Pump
Strainer
Foot
Valve
March
12,
2004
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Generic
Simple
Pipe
Intake
System
One
of
the
key
difficulties
with
this
type
of
system
is
that
the
Net
Positive
Suction
Head
(
NPSH)
available
to
the
pump
may
be
close
to
the
NPSH
required
for
the
desired
delivery.
That
is,
most
pumps
have
limitations
on
the
allowable
negative
gauge
pressure
on
the
suction
side
of
the
pump.
If
the
suction
pressure
falls
below
it's
NPSH
required
limit,
cavitation
will
occur
in
the
pump.
The
simple
pipe
intake
is
best
suited
to
situations
where
the
pump
is
close
to
or
below
the
water
level
to
maximise
NPSH
available.

C.
Assumptions
on
Existing
Facility
Configuration
In
order
to
assemble
this
cost
estimate
several
assumptions
have
been
made
regarding
the
physical
details
of
existing
facilities
and
the
way
in
which
the
works
will
be
undertaken:

1.
For
the
purpose
of
this
exercise,
simple
pipes
and
caissons
will
be
treated
as
physically
the
same
thing.
Both
simple
pipes
and
caissons
have
an
opening
at
some
depth
into
the
ocean.
There
may
be
a
coarse
mesh
screen
already
installed
or
it
may
be
completely
open.
In
the
case
that
a
simple
pipe
has
a
foot
valve
at
its
opening
into
the
ocean,
there
will
be
a
flange
already
fitted
to
for
the
foot
valve.
The
technologies
that
are
employed
here
(
fine
mesh
screen
or
velocity
cap)
are
compatible
with
the
installation
of
a
foot
(
or
non­
return)
valve
in
the
system.
The
cost
estimate
will
not
be
significantly
altered
by
the
inclusion
of
a
foot
valve
if
required.
It
should
be
noted
that
of
the
79
intakes
recorded
during
the
preliminary
inquiry,
only
4
appear
to
have
the
inclusion
of
a
foot
valve.

2.
Screens
that
are
generally
connected
to
an
intake
pipe
via
a
standard
flange.
Generally
the
base
of
a
caisson
or
simple
pipe
will
not
have
a
flange
fitted.
Flanges
are
generally
welded
to
a
pipe.
Subsea
welding
typically
has
problems
associated
with
embrittlement
(
resulting
from
extremely
fast
weld
cooling
rates).

3.
The
caissons
are
offline
for
routine
maintenance
during
the
work
being
undertaken
to
modify
the
intake
opening.
No
allowance
has
been
made
for
production
losses
resulting
from
the
intake
being
taken
off
line
for
this
work.

4.
The
intake
is
sufficiently
remote
from
other
on­
line
intakes.
The
distance
between
this
intake
and
an
adjacent
operating
intake
is
such
that
it
is
not
a
risk
to
a
diver
modifying
the
intake
opening.

5.
The
Typical
Flow
Rates:
The
nominal
flow
rate
through
an
intake
will
be
assumed
to
result
in
a
bulk
pipe
velocity
of
3ft/
sec.
The
average
intake
pipe
velocity
for
all
facilities
utilizing
simple
pipes
or
caissons
that
responded
to
the
EPA
survey
was
2.88ft/
sec.
Therefore,
3ft/
sec
will,
on
average,
be
conservative
for
intake
flow
rate.
March
12,
2004
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23
6.
The
intake
pipe
diameters
and
flow
rates
that
will
be
used
for
this
cost
estimate
are
presented
in
Table
1.

Table
1.
Details
of
Pipe
Diameter
and
Associated
Flow
Rates
Intake
Pipe
Size
(
in)
Intake
Velocity
(
ft/
sec)
Intake
Flow
Rate
(
m3/
hr)
Intake
Flow
Rate
(
GPM)
Intake
Flow
Rate
(
MGD)
12"
3.0
240
1058
1.5
18"
3.0
540
2379
3.4
24"
3.0
961
4230
6.1
30"
3.0
1501
6610
9.5
36"
3.0
2162
9518
13.7
7.
The
new
mesh
opening
will
be
sized
to
achieve
0.5ft/
sec
through
screen
velocity
for
the
typical
intake
flow
rate.
The
fine
mesh
opening
size
will
be
5mm
and
assumed
to
have
a
50%
or
greater
open
area.

8.
The
intake
depth
is
an
important
variable
that
needs
to
be
considered.
The
fixed
costs
with
mobilizing
dive
teams
may
constitute
a
significant
portion
of
the
overall
intake
modification
cost.
The
following
ranges
have
been
used
to
define
intake
depth
characteristics:
Shallow:
<
60ft,
Medium:
60
 
200ft
(
not
saturation
dive),
Deep:
200
­
350ft
(
saturation
dive),
Very
Deep
+
350ft
(
saturation
dive).
Note:
The
respondents
to
the
EPA
survey
have
typically
not
included
the
depth
of
their
intake
in
their
reply.
44
respondents
have
reported
depths
with
the
following
breakdown:
13
Shallow,
19
Medium,
11
Deep
and
1
Very
Deep.

9.
The
characteristic
(
average)
depths
that
will
be
used
for
costing
each
of
the
intake
groups
will
be
assumed
as:
Shallow:
50ft,
Medium:
160ft,
Deep:
300ft,
Very
Deep:
550ft.

10.
The
cost
estimates
for
existing
facilities
below
have
been
calculated
based
on
using
divers.
This
is
a
conservative
approach
as
the
use
of
Remotely
Operated
Vehicles
(
ROV's)
and
One
Atmosphere
or
Hard
Dive
Suits
(
such
as
Newtsuit)
are
likely
to
be
significantly
less
expensive
(
particularly
at
the
deeper
depths).

11.
Facility
location:
It
is
assumed
that
the
facility
is
located
within
750
Nautical
Miles
(
approximately
2
days
boat
journey)
of
a
significant
shore
base
(
or
port)
that
includes
dive
crews
and
the
means
for
heavy
transportation.

12.
Available
Facility
Services:
Compressed
air
is
available
at
the
location
with
a
pressure
of
90psi
(
typical
industrial
specification).

13.
Costs
to
modify
additional
intakes
will
assume
that
the
work
can
be
carried
out
with
no
significant
delays
between
finishing
one
March
12,
2004
­
Page
9
of
23
intake
and
starting
the
next.
The
savings
for
modifying
additional
intakes
at
the
same
time
will
primarily
be
mobilization
of
the
dive
crew.

IV.
Summary
of
Cost
Estimates
A.
New
Facilities
For
new
facilities,
there
is
no
special
detail
required
for
the
estimate
to
fit
this
new
equipment.
However,
a
brief
description
of
what
has
been
allowed
for
is
warranted.

1.
Fine
Mesh
Screens
and
Velocity
Caps:
In
addition
to
the
purchase
cost
of
the
screen
or
cap,
the
estimate
has
allowed
for
an
ANSI
class
150#
flange
to
be
welded
to
the
intake
pipe.
A
bolt
up
of
the
flanged
connection
has
also
been
calculated.
This
work
would
be
undertaken
in
a
fabrication
yard
during
the
construction
process
of
the
platform.
2.
Intake
Pipe
Extension/
Relocation:
Since
the
actual
extension
that
is
required
will
need
to
be
determined
for
each
facility,
a
100ft
extension
of
the
intake
pipe
in
order
to
avoid
fish
friendly
environment
has
been
assumed
for
this
estimate.
The
costs
include
the
pipe
material,
3
full
penetration
(
butt)
pipe
welds
and
the
supply
and
installation
of
4
pipe
support
clamps.
This
work
would
also
be
undertaken
in
a
fabrication
yard
during
the
construction
process
of
the
platform.
Cost
estimates
for
new
facilities
modifying
their
intake
using
fine
mesh
screen
option
are
presented
in
Table
2
and
cost
estimates
for
new
facilities
modifying
their
intake
structure
using
velocity
caps
are
presented
in
Table
3.
In
addition,
Table
4
presents
the
cost
for
extending
the
intake
location
by
100
feet
in
order
to
avoid
low
impact
environment.

Table
2.
Cost
Estimates
for
New
Facilities
Modifying
Intake
Using
Fine
Mesh
Screens
Stainless
Steel
Fine
Mesh
Screens:
No
Additional
Anti­
Fouling
Fine
Mesh
Screen:
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
3,926
$
3,926
18"
Intake
Pipe
$
5,934
$
5,934
24"
Intake
Pipe
$
7,563
$
7,563
30"
Intake
Pipe
$
10,140
$
10,140
36"
Intake
Pipe
$
13,633
$
13,633
Stainless
Steel
Fine
Mesh
Screens:
Air
Sparge
Anti­
Fouling
Fine
Mesh
Screen:
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
20,626
$
4,326
18"
Intake
Pipe
$
23,434
$
6,434
24"
Intake
Pipe
$
30,313
$
8,263
30"
Intake
Pipe
$
34,940
$
11,140
36"
Intake
Pipe
$
42,133
$
14,933
CuNi
Fine
Mesh
Screens:
No
Additional
Anti­
Fouling
Fine
Mesh
Screen:
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
6,016
$
6,016
18"
Intake
Pipe
$
9,034
$
9,034
24"
Intake
Pipe
$
13,063
$
13,063
March
12,
2004
­
Page
10
of
23
30"
Intake
Pipe
$
18,840
$
18,840
36"
Intake
Pipe
$
26,473
$
26,473
CuNi
Fine
Mesh
Screens:
Air
Sparge
Anti­
Fouling
Fine
Mesh
Screen:
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
22,716
$
6,416
18"
Intake
Pipe
$
26,534
$
9,534
24"
Intake
Pipe
$
35,813
$
13,763
30"
Intake
Pipe
$
43,640
$
19,840
36"
Intake
Pipe
$
54,973
$
27,773
Table
3.
Cost
Estimates
for
New
Facilities
Modifying
Intake
Using
Velocity
Caps
Velocity
Caps:
Stainless
Steel
Velocity
Cap:
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
25,726
$
25,726
18"
Intake
Pipe
$
26,234
$
26,234
24"
Intake
Pipe
$
27,663
$
27,663
30"
Intake
Pipe
$
29,740
$
29,740
36"
Intake
Pipe
$
32,713
$
32,713
Velocity
Caps:
CuNi
Anti­
Fouling
Velocity
Cap:
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
25,726
$
25,726
18"
Intake
Pipe
$
26,234
$
26,234
24"
Intake
Pipe
$
27,663
$
27,663
30"
Intake
Pipe
$
29,740
$
29,740
36"
Intake
Pipe
$
32,713
$
32,713
Table
4.
Cost
Estimates
for
Relocating
Intake
to
Avoid
Low
Impact
Environment
Intake
Extension/
Relocation
(
For
Screens
and
Velocity
Caps)
Single
Intake
($
per
100ft)
Additional
Intakes
($
per
100ft)
12"
Intake
Pipe
$
11,296
$
11,296
18"
Intake
Pipe
$
17,554
$
17,554
24"
Intake
Pipe
$
23,427
$
23,427
30"
Intake
Pipe
$
29,890
$
29,890
36"
Intake
Pipe
$
35,810
$
35,810
B.
Existing
Facilities
Following
is
the
detailed
information
that
was
used
to
assemble
this
cost
estimate
for
retrofit
of
existing
facilities.
The
diagrams
indicate
what
was
physically
estimated
and
the
spreadsheets
were
used
for
summing
up
materials
and
calculation.
The
schedules
of
rates
are
found
in
the
spreadsheets.
The
estimates
calculate
the
cost
for
the
retrofit
of
a
single
sea
water
intake.
March
12,
2004
­
Page
11
of
23
The
generic
configuration
for
retrofitting
a
flange
to
the
bottom
of
a
submerged
open
pipe
is
as
follows:

Proposed
Flange
Addition
Method
to
Caisson
or
Simple
Pipe
Item
1:
Existing
Intake
Pipe
(
Caisson
or
Simple
Pipe)
Item
2:
Opening
of
Intake
Pipe
Item
3:
Rolled
Sleeve
Item
4:
ANSI
Flange
Item
5:
Retaining
Pins
Fabrication
and
Installation
Procedure:

In
an
onshore
workshop:
1.
Prefabricate
Item
3
by
rolling
plate
to
suit
the
outside
diameter
(+
1/
2")
of
the
intake
pipe
(
caisson
or
simple
pipe).
The
length
of
this
item
should
be
approximately
2
intake
pipe
diameters.
2.
Weld
an
ANSI
flange
(
Weld
Neck)
to
the
base
of
the
Item
3.
3.
Bolt
up
sleeved
flange
to
the
screen
or
velocity
cap
(
assembly
not
shown
in
diagram
above).
Note:
The
screen/
velocity
cap
may
be
bolted
to
the
flange
in
the
workshop,
on
board
the
OCOGEF
or
under
water
by
the
divers.
For
the
cheapest
solution,
it
is
assumed
that
the
bolt
up
will
occur
in
the
onshore
workshop.
4.
Ship
components
to
site.

Work
completed
by
divers:
1.
Cut
off
the
bottom
of
the
intake
pipe
to
remove
the
existing
coarse
bar
screen
and/
or
any
other
redundant
features
of
the
intake
pipe
(
such
as
other
openings).
2.
Clean
off
any
bio­
matter
from
the
base
of
the
intake
pipe
so
that
the
sleeve
will
easily
slide
on.
1
5
2
4
3
March
12,
2004
­
Page
12
of
23
3.
Slide
the
sleeved
flange
assembly
(
including
the
screen/
velocity
cap
if
already
bolted
up).
Drill
through
and
install
at
least
2
retaining
bolts
to
hold
the
assembly
in
place.

If
air
sparging
is
required,
a
2"
line
will
be
installed
and
restrained
(
pipe
clamp)
against
the
existing
intake
pipe.
The
pipe
would
be
lowered
from
the
deck
of
the
OCOGEF
and
the
divers
attach
the
clamps
between
the
two
pipes.
Cost
estimates
for
modifying
the
intake
for
existing
facilities
using
fine
mesh
screens
and
velocity
caps
at
varying
depths
are
shown
in
Tables
5
and
6
respectively.

Table
5.
Cost
Estimates
for
Existing
Facilities
Modifying
Intake
at
Varying
Depths
Using
Fine
Mesh
Screens
Stainless
Steel
Fine
Mesh
Screens:
No
Other
Anti­
Fouling
Fine
Mesh
Screen:
Shallow
(<
60ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
121,149
$
20,899
18"
Intake
Pipe
$
123,631
$
23,381
24"
Intake
Pipe
$
126,098
$
25,848
30"
Intake
Pipe
$
129,945
$
29,695
36"
Intake
Pipe
$
135,545
$
30,275
Fine
Mesh
Screen:
Medium
(
60­
200ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
169,899
$
43,399
18"
Intake
Pipe
$
172,381
$
45,881
24"
Intake
Pipe
$
174,848
$
48,348
30"
Intake
Pipe
$
178,695
$
52,195
36"
Intake
Pipe
$
184,295
$
52,775
Fine
Mesh
Screen:
Deep
(
200­
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
273,399
$
29,399
18"
Intake
Pipe
$
275,881
$
31,881
24"
Intake
Pipe
$
278,348
$
34,348
30"
Intake
Pipe
$
282,195
$
38,195
36"
Intake
Pipe
$
287,795
$
38,775
Fine
Mesh
Screen:
Very
Deep
(+
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
334,899
$
32,899
18"
Intake
Pipe
$
337,381
$
35,381
24"
Intake
Pipe
$
339,848
$
37,848
30"
Intake
Pipe
$
343,695
$
41,695
36"
Intake
Pipe
$
349,295
$
42,275
Stainless
Steel
Fine
Mesh
Screens:
Air
Sparge
Anti­
Fouling
Fine
Mesh
Screen:
Shallow
(<
60ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
137,849
$
21,299
18"
Intake
Pipe
$
141,131
$
23,881
24"
Intake
Pipe
$
148,848
$
26,548
30"
Intake
Pipe
$
154,745
$
30,695
36"
Intake
Pipe
$
164,045
$
36,595
March
12,
2004
­
Page
13
of
23
Fine
Mesh
Screen:
Medium
(
60­
200ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
186,599
$
43,799
18"
Intake
Pipe
$
189,881
$
46,381
24"
Intake
Pipe
$
197,598
$
49,048
30"
Intake
Pipe
$
203,495
$
53,195
36"
Intake
Pipe
$
212,795
$
59,095
Fine
Mesh
Screen:
Deep
(
200­
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
290,099
$
29,799
18"
Intake
Pipe
$
293,381
$
32,381
24"
Intake
Pipe
$
301,098
$
35,048
30"
Intake
Pipe
$
306,995
$
39,195
36"
Intake
Pipe
$
316,295
$
45,095
Fine
Mesh
Screen:
Very
Deep
(+
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
351,599
$
33,299
18"
Intake
Pipe
$
354,881
$
35,881
24"
Intake
Pipe
$
362,598
$
38,548
30"
Intake
Pipe
$
368,495
$
42,695
36"
Intake
Pipe
$
377,795
$
48,595
CuNi
Fine
Mesh
Screens:
No
Additional
Anti­
Fouling
Fine
Mesh
Screen:
Shallow
(<
60ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
123,239
$
22,989
18"
Intake
Pipe
$
126,731
$
26,481
24"
Intake
Pipe
$
131,598
$
31,348
30"
Intake
Pipe
$
138,645
$
38,395
36"
Intake
Pipe
$
148,385
$
48,135
Fine
Mesh
Screen:
Medium
(
60­
200ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
171,989
$
45,489
18"
Intake
Pipe
$
175,481
$
48,981
24"
Intake
Pipe
$
180,348
$
53,848
30"
Intake
Pipe
$
187,395
$
60,895
36"
Intake
Pipe
$
197,135
$
70,635
Fine
Mesh
Screen:
Deep
(
200­
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
275,489
$
31,489
18"
Intake
Pipe
$
278,981
$
34,981
24"
Intake
Pipe
$
283,848
$
39,848
30"
Intake
Pipe
$
290,895
$
46,895
36"
Intake
Pipe
$
300,635
$
56,635
Fine
Mesh
Screen:
Very
Deep
(+
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
336,989
$
34,989
18"
Intake
Pipe
$
340,481
$
38,481
24"
Intake
Pipe
$
345,348
$
43,348
30"
Intake
Pipe
$
352,395
$
50,395
36"
Intake
Pipe
$
362,135
$
60,135
March
12,
2004
­
Page
14
of
23
CuNi
Fine
Mesh
Screens:
Air
Sparge
Anti­
Fouling
Fine
Mesh
Screen:
Shallow
(<
60ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
139,939
$
23,389
18"
Intake
Pipe
$
144,231
$
26,981
24"
Intake
Pipe
$
154,348
$
32,048
30"
Intake
Pipe
$
163,445
$
39,395
36"
Intake
Pipe
$
176,885
$
49,435
Fine
Mesh
Screen:
Medium
(
60­
200ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
188,689
$
45,889
18"
Intake
Pipe
$
192,981
$
49,481
24"
Intake
Pipe
$
203,098
$
54,548
30"
Intake
Pipe
$
212,195
$
61,895
36"
Intake
Pipe
$
225,635
$
71,935
Fine
Mesh
Screen:
Deep
(
200­
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
292,189
$
31,889
18"
Intake
Pipe
$
296,481
$
35,481
24"
Intake
Pipe
$
306,598
$
40,548
30"
Intake
Pipe
$
315,695
$
47,895
36"
Intake
Pipe
$
329,135
$
57,935
Fine
Mesh
Screen:
Very
Deep
(+
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
353,689
$
35,389
18"
Intake
Pipe
$
357,981
$
38,981
24"
Intake
Pipe
$
368,098
$
44,048
30"
Intake
Pipe
$
377,195
$
51,395
36"
Intake
Pipe
$
390,635
$
61,435
Table
6.
Cost
Estimates
for
Existing
Facilities
Modifying
Intake
at
Varying
Depths
Using
Velocity
Caps
Velocity
Caps:
Stainless
Steel
Velocity
Cap:
Shallow
(<
60ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
142,949
$
42,699
18"
Intake
Pipe
$
143,931
$
43,681
24"
Intake
Pipe
$
146,198
$
45,948
30"
Intake
Pipe
$
149,545
$
49,295
36"
Intake
Pipe
$
154,625
$
54,375
Velocity
Cap:
Medium
(
60­
200ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
191,699
$
65,199
18"
Intake
Pipe
$
192,681
$
66,181
24"
Intake
Pipe
$
194,948
$
68,448
30"
Intake
Pipe
$
198,295
$
71,795
36"
Intake
Pipe
$
203,375
$
76,875
Velocity
Cap:
Deep
(
200­
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
295,199
$
51,199
18"
Intake
Pipe
$
296,181
$
52,181
24"
Intake
Pipe
$
298,448
$
54,448
30"
Intake
Pipe
$
301,795
$
57,795
36"
Intake
Pipe
$
306,875
$
62,875
March
12,
2004
­
Page
15
of
23
Velocity
Cap:
Very
Deep
(+
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
356,699
$
54,699
18"
Intake
Pipe
$
357,681
$
55,681
24"
Intake
Pipe
$
359,948
$
57,948
30"
Intake
Pipe
$
363,295
$
61,295
36"
Intake
Pipe
$
368,375
$
66,375
Velocity
Caps:
CuNi
Anti­
Fouling
Velocity
Cap:
Shallow
(<
60ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
142,949
$
42,699
18"
Intake
Pipe
$
143,931
$
43,681
24"
Intake
Pipe
$
146,198
$
45,948
30"
Intake
Pipe
$
149,545
$
49,295
36"
Intake
Pipe
$
154,625
$
54,375
Velocity
Cap:
Medium
(
60­
200ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
191,699
$
65,199
18"
Intake
Pipe
$
192,681
$
66,181
24"
Intake
Pipe
$
194,948
$
68,448
30"
Intake
Pipe
$
198,295
$
71,795
36"
Intake
Pipe
$
203,375
$
76,875
Velocity
Cap:
Deep
(
200­
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
295,199
$
51,199
18"
Intake
Pipe
$
296,181
$
52,181
24"
Intake
Pipe
$
298,448
$
54,448
30"
Intake
Pipe
$
301,795
$
57,795
36"
Intake
Pipe
$
306,875
$
62,875
Velocity
Cap:
Very
Deep
(+
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
356,699
$
54,699
18"
Intake
Pipe
$
357,681
$
55,681
24"
Intake
Pipe
$
359,948
$
57,948
30"
Intake
Pipe
$
363,295
$
61,295
36"
Intake
Pipe
$
368,375
$
66,375
It
is
worth
noting
that
for
existing
facilities,
the
cost
of
capital
equipment
is
significantly
less
than
the
cost
for
installation.
The
typical
equipment
costs
for
existing
facilities
are
presented
in
Table
7.

Table
7.
Equipment
Cost
for
Intake
Modification
for
Existing
Facilities
Using
Fine
Mesh
Screens
and
Velocity
Caps
Item
Cost
for
a
Fine
Mesh
Screen
316
Stainless
Steel
90/
10
CuNi
12"
Intake
Pipe
$
3,200
$
5,290
18"
Intake
Pipe
$
4,700
$
7,800
24"
Intake
Pipe
$
5,900
$
11,400
30"
Intake
Pipe
$
7,900
$
16,600
36"
Intake
Pipe
$
10,920
$
23,760
Item
Cost
for
a
Velocity
Cap
316
Stainless
Steel
90/
10
CuNi
12"
Intake
Pipe
$
25,000
$
25,000
18"
Intake
Pipe
$
25,000
$
25,000
24"
Intake
Pipe
$
26,000
$
26,000
30"
Intake
Pipe
$
27,500
$
27,500
36"
Intake
Pipe
$
30,000
$
30,000
March
12,
2004
­
Page
16
of
23
Item
Cost
for
Air
Sparging
For
First
Intake
For
Additional
Intakes
12"
Intake
Pipe
$
16,700
$
400
18"
Intake
Pipe
$
17,500
$
500
24"
Intake
Pipe
$
22,750
$
700
30"
Intake
Pipe
$
24,800
$
1,000
36"
Intake
Pipe
$
28,500
$
1,300
C.
Operation
and
Maintenance
Costs
Assumptions
1.
Onboard
personnel
will
carry
out
operation,
inspection
and
maintenance
work
of
equipment
located
on
the
deck.
The
cost
estimate
has
been
based
on
$
60/
hr
on
board
labor
rates.
2.
Operation
costs
of
the
system
include
the
supply
of
power
to
the
air
sparging
system
for
normal
operation.
The
frequency
of
air
sparge
operation
depends
on
the
quantity
of
debris
in
the
water.
This
frequency
ranges
from
once
per
week
to
once
an
hour.
Since
the
vessel
is
mobile
and
all
types
of
water
may
be
encountered,
it
is
assumed
that
the
air
sparge
system
is
automatically
operated
every
hour
(
24
times
a
day).
Furthermore,
it
is
assumed
that
the
accumulator
takes
0.5
hours
to
recharge
after
an
air
burst
event.
3.
Based
on
vendor
information,
routine
inspection
and
maintenance
requirements
for
the
air
sparging
system
have
been
estimated
based
on
3
hours
per
week
for
all
system
sizes.
4.
Inspection
intervals
for
fine
mesh
screens
and
velocity
caps
are
assumed
to
be
one
per
year.
This
has
been
based
on
typical
inspection
frequencies
for
onshore
and
coastal
facilities.
5.
The
costs
of
inspection
and
maintenance
of
the
intake
structure
includes
options
for
Commercial
Divers,
Hard
Suit
Divers
and
Remotely
Operated
Vehicles
(
ROVs).
An
allowance
of
1
day
per
intake
has
been
made
for
inspection
and
cleaning
of
the
new
intake
structures.
6.
It
is
assumed
that
the
existing
intake
structures
are
inspected
on
an
annual
basis.
As
such,
mobilization
and
demobilization
of
the
inspection
and
cleaning
equipment
has
not
been
included
in
this
estimate.
7.
6%
of
the
capital
cost
has
been
allowed
for
annual
parts
replacement
cost.

The
estimated
O
&
M
costs
for
fine
mesh
screen
and
velocity
cap
options
using
commercial
divers
and
hard
suit
divers
are
shown
in
Tables
8
and
9,
respectively
March
12,
2004
­
Page
17
of
23
Table
8.
Fine
Mesh
Screen
and
Velocity
Cap
O&
M
Costs
Using
Commercial
Diver
Inspection
Shallow
Intake
Depth
O&
M
Cost
Per
Fine
Mesh
Screen
316
Stainless
Steel
90/
10
CuNi
12"
Intake
Pipe
$
16,692
$
16,817
18"
Intake
Pipe
$
16,782
$
16,968
24"
Intake
Pipe
$
16,854
$
17,184
30"
Intake
Pipe
$
16,974
$
17,496
36"
Intake
Pipe
$
17,155
$
17,926
Shallow
Intake
Depth
O&
M
Cost
for
a
Velocity
Cap
316
Stainless
Steel
90/
10
CuNi
12"
Intake
Pipe
$
18,000
$
18,000
18"
Intake
Pipe
$
18,000
$
18,000
24"
Intake
Pipe
$
18,060
$
18,060
30"
Intake
Pipe
$
18,150
$
18,150
36"
Intake
Pipe
$
18,300
$
18,300
Medium
Intake
Depth
O&
M
Cost
Per
Fine
Mesh
Screen
316
Stainless
Steel
90/
10
CuNi
12"
Intake
Pipe
$
19,692
$
19,817
18"
Intake
Pipe
$
19,782
$
19,968
24"
Intake
Pipe
$
19,854
$
20,184
30"
Intake
Pipe
$
19,974
$
20,496
36"
Intake
Pipe
$
20,155
$
20,926
Medium
Intake
Depth
O&
M
Cost
for
a
Velocity
Cap
316
Stainless
Steel
90/
10
CuNi
12"
Intake
Pipe
$
21,000
$
21,000
18"
Intake
Pipe
$
21,000
$
21,000
24"
Intake
Pipe
$
21,060
$
21,060
30"
Intake
Pipe
$
21,150
$
21,150
36"
Intake
Pipe
$
21,300
$
21,300
Deep
Intake
Depth
O&
M
Cost
Per
Fine
Mesh
Screen
316
Stainless
Steel
90/
10
CuNi
12"
Intake
Pipe
$
25,192
$
25,317
18"
Intake
Pipe
$
25,282
$
25,468
24"
Intake
Pipe
$
25,354
$
25,684
30"
Intake
Pipe
$
25,474
$
25,996
36"
Intake
Pipe
$
25,655
$
26,426
Deep
Intake
Depth
O&
M
Cost
for
a
Velocity
Cap
316
Stainless
Steel
90/
10
CuNi
12"
Intake
Pipe
$
26,500
$
26,500
18"
Intake
Pipe
$
26,500
$
26,500
24"
Intake
Pipe
$
26,560
$
26,560
30"
Intake
Pipe
$
26,650
$
26,650
36"
Intake
Pipe
$
26,800
$
26,800
March
12,
2004
­
Page
18
of
23
Very
Deep
Intake
Depth
O&
M
Cost
Per
Fine
Mesh
Screen
316
Stainless
Steel
90/
10
CuNi
12"
Intake
Pipe
$
28,692
$
28,817
18"
Intake
Pipe
$
28,782
$
28,968
24"
Intake
Pipe
$
28,854
$
29,184
30"
Intake
Pipe
$
28,974
$
29,496
36"
Intake
Pipe
$
29,155
$
29,926
Very
Deep
Intake
Depth
O&
M
Cost
for
a
Velocity
Cap
316
Stainless
Steel
90/
10
CuNi
12"
Intake
Pipe
$
30,000
$
30,000
18"
Intake
Pipe
$
30,000
$
30,000
24"
Intake
Pipe
$
30,060
$
30,060
30"
Intake
Pipe
$
30,150
$
30,150
36"
Intake
Pipe
$
30,300
$
30,300
Table
9.
Fine
Mesh
Screen
and
Velocity
Cap
O&
M
Costs
Using
Hard
Suit
Diver
Inspection
All
Intake
Depths
O&
M
Cost
Per
Fine
Mesh
Screen
316
Stainless
Steel
90/
10
CuNi
12"
Intake
Pipe
$
45,692
$
45,817
18"
Intake
Pipe
$
45,782
$
45,968
24"
Intake
Pipe
$
45,854
$
46,184
30"
Intake
Pipe
$
45,974
$
46,496
36"
Intake
Pipe
$
46,155
$
46,926
O&
M
Cost
for
a
Velocity
Cap
316
Stainless
Steel
90/
10
CuNi
12"
Intake
Pipe
$
47,000
$
47,000
18"
Intake
Pipe
$
47,000
$
47,000
24"
Intake
Pipe
$
47,060
$
47,060
30"
Intake
Pipe
$
47,150
$
47,150
36"
Intake
Pipe
$
47,300
$
47,300
Fine
Mesh
Screen
and
Velocity
Cap
O&
M
Costs
Using
ROV
Inspection
All
Intake
Depths
O&
M
Cost
Per
Fine
Mesh
Screen
316
Stainless
Steel
90/
10
CuNi
12"
Intake
Pipe
$
20,192
$
20,317
18"
Intake
Pipe
$
20,282
$
20,468
24"
Intake
Pipe
$
20,354
$
20,684
30"
Intake
Pipe
$
20,474
$
20,996
36"
Intake
Pipe
$
20,655
$
21,426
O&
M
Cost
for
a
Velocity
Cap
316
Stainless
Steel
90/
10
CuNi
12"
Intake
Pipe
$
21,500
$
21,500
18"
Intake
Pipe
$
21,500
$
21,500
24"
Intake
Pipe
$
21,560
$
21,560
30"
Intake
Pipe
$
21,650
$
21,650
36"
Intake
Pipe
$
21,800
$
21,800
March
12,
2004
­
Page
19
of
23
Additional
O
&
M
cost
estimates
for
air
sparging
are
depicted
in
Table
10.

Table
10.
Air
Sparging
Operation
and
Maintenance
Costs
O&
M
Cost
Per
Air
Sparging
Unit
Single
Intake
Structures
Additional
Intake
Structures
12"
Intake
Pipe
$
10,623
$
9,645
18"
Intake
Pipe
$
10,671
$
9,651
24"
Intake
Pipe
$
10,986
$
9,663
30"
Intake
Pipe
$
11,501
$
10,073
36"
Intake
Pipe
$
11,723
$
10,091
March
12,
2004
­
Page
20
of
23
Addendum
1
Cost
Estimate
for
the
Installation
of
Velocity
Caps
and
Fine
Mesh
Screens
using
a
Hard
Suit
(
Newtsuit)

This
cost
estimate
above
for
existing
facilities
has
been
repeated
here
using
the
Newtsuit
technology.
The
details
of
the
modification
to
the
existing
caisson
have
not
been
changed
for
this
estimate.
It
must
be
noted
that
this
estimate
was
based
solely
on
the
information
obtained
from
the
Newtsuit
web
site
(
http://
www.
nwrain.
net/~
newtsuit/
home/
newtsuit/
ns_
ovr.
htm).

Addendum
Table
A­
1
present
the
cost
estimates
for
modifying
intake
structure
using
fine
mesh
screens
for
existing
facilities
when
Newtsuit
technology
is
used.

Addendum
Table
A­
1.
Cost
Estimates
for
Intake
Modification
Using
Fine
Mesh
Screens
and
Newtsuit
Technology
Stainless
Steel
Fine
Mesh
Screens:
No
Other
Anti­
Fouling
Fine
Mesh
Screen:
Shallow
(<
60ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
89,059
$
49,899
18"
Intake
Pipe
$
91,541
$
52,381
24"
Intake
Pipe
$
94,008
$
54,848
30"
Intake
Pipe
$
97,855
$
58,695
36"
Intake
Pipe
$
103,455
$
59,275
Fine
Mesh
Screen:
Medium
(
60­
200ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
111,809
$
72,649
18"
Intake
Pipe
$
114,291
$
75,131
24"
Intake
Pipe
$
116,758
$
77,598
30"
Intake
Pipe
$
120,605
$
81,445
36"
Intake
Pipe
$
126,205
$
82,025
March
12,
2004
­
Page
21
of
23
Fine
Mesh
Screen:
Deep
(
200­
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
134,559
$
95,399
18"
Intake
Pipe
$
137,041
$
97,881
24"
Intake
Pipe
$
139,508
$
100,348
30"
Intake
Pipe
$
143,355
$
104,195
36"
Intake
Pipe
$
148,955
$
104,775
Fine
Mesh
Screen:
Very
Deep
(+
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
157,309
$
118,149
18"
Intake
Pipe
$
159,791
$
120,631
24"
Intake
Pipe
$
162,258
$
123,098
30"
Intake
Pipe
$
166,105
$
126,945
36"
Intake
Pipe
$
171,705
$
127,525
Stainless
Steel
Fine
Mesh
Screens:
Air
Sparge
Anti­
Fouling
Fine
Mesh
Screen:
Shallow
(<
60ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
105,759
$
50,299
18"
Intake
Pipe
$
109,041
$
52,881
24"
Intake
Pipe
$
116,758
$
55,548
30"
Intake
Pipe
$
122,655
$
59,695
36"
Intake
Pipe
$
131,955
$
65,595
Fine
Mesh
Screen:
Medium
(
60­
200ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
128,509
$
73,049
18"
Intake
Pipe
$
131,791
$
75,631
24"
Intake
Pipe
$
139,508
$
78,298
30"
Intake
Pipe
$
145,405
$
82,445
36"
Intake
Pipe
$
154,705
$
88,345
Fine
Mesh
Screen:
Deep
(
200­
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
151,259
$
95,799
18"
Intake
Pipe
$
154,541
$
98,381
24"
Intake
Pipe
$
162,258
$
101,048
30"
Intake
Pipe
$
168,155
$
105,195
36"
Intake
Pipe
$
177,455
$
111,095
Fine
Mesh
Screen:
Very
Deep
(+
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
174,009
$
118,549
18"
Intake
Pipe
$
177,291
$
121,131
24"
Intake
Pipe
$
185,008
$
123,798
30"
Intake
Pipe
$
190,905
$
127,945
36"
Intake
Pipe
$
200,205
$
133,845
CuNi
Fine
Mesh
Screens:
No
Additional
Anti­
Fouling
Fine
Mesh
Screen:
Shallow
(<
60ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
91,149
$
51,989
18"
Intake
Pipe
$
94,641
$
55,481
24"
Intake
Pipe
$
99,508
$
60,348
30"
Intake
Pipe
$
106,555
$
67,395
36"
Intake
Pipe
$
116,295
$
77,135
Fine
Mesh
Screen:
Medium
(
60­
200ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
113,899
$
74,739
18"
Intake
Pipe
$
117,391
$
78,231
24"
Intake
Pipe
$
122,258
$
83,098
30"
Intake
Pipe
$
129,305
$
90,145
March
12,
2004
­
Page
22
of
23
36"
Intake
Pipe
$
139,045
$
99,885
Fine
Mesh
Screen:
Deep
(
200­
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
136,649
$
97,489
18"
Intake
Pipe
$
140,141
$
100,981
24"
Intake
Pipe
$
145,008
$
105,848
30"
Intake
Pipe
$
152,055
$
112,895
36"
Intake
Pipe
$
161,795
$
122,635
Fine
Mesh
Screen:
Very
Deep
(+
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
159,399
$
120,239
18"
Intake
Pipe
$
162,891
$
123,731
24"
Intake
Pipe
$
167,758
$
128,598
30"
Intake
Pipe
$
174,805
$
135,645
36"
Intake
Pipe
$
184,545
$
145,385
CuNi
Fine
Mesh
Screens:
Air
Sparge
Anti­
Fouling
Fine
Mesh
Screen:
Shallow
(<
60ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
107,849
$
52,389
18"
Intake
Pipe
$
112,141
$
55,981
24"
Intake
Pipe
$
122,258
$
61,048
30"
Intake
Pipe
$
131,355
$
68,395
36"
Intake
Pipe
$
144,795
$
78,435
Fine
Mesh
Screen:
Medium
(
60­
200ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
130,599
$
75,139
18"
Intake
Pipe
$
134,891
$
78,731
24"
Intake
Pipe
$
145,008
$
83,798
30"
Intake
Pipe
$
154,105
$
91,145
36"
Intake
Pipe
$
167,545
$
101,185
Fine
Mesh
Screen:
Deep
(
200­
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
153,349
$
97,889
18"
Intake
Pipe
$
157,641
$
101,481
24"
Intake
Pipe
$
167,758
$
106,548
30"
Intake
Pipe
$
176,855
$
113,895
36"
Intake
Pipe
$
190,295
$
123,935
Fine
Mesh
Screen:
Very
Deep
(+
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
176,099
$
120,639
18"
Intake
Pipe
$
180,391
$
124,231
24"
Intake
Pipe
$
190,508
$
129,298
30"
Intake
Pipe
$
199,605
$
136,645
36"
Intake
Pipe
$
213,045
$
146,685
Addendum
Table
A­
2
present
the
cost
estimates
for
modifying
intake
structure
using
velocity
caps
for
existing
facilities
when
Newtsuit
technology
is
used.

Addendum
Table
A­
1.
Cost
Estimates
for
Intake
Modification
Using
Velocity
Caps
and
Newtsuit
Technology
Velocity
Caps:
Stainless
Steel
Velocity
Cap:
Shallow
(<
60ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
110,859
$
71,699
18"
Intake
Pipe
$
111,841
$
72,681
24"
Intake
Pipe
$
114,108
$
74,948
March
12,
2004
­
Page
23
of
23
30"
Intake
Pipe
$
117,455
$
78,295
36"
Intake
Pipe
$
122,535
$
83,375
Velocity
Cap:
Medium
(
60­
200ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
133,609
$
94,449
18"
Intake
Pipe
$
134,591
$
95,431
24"
Intake
Pipe
$
136,858
$
97,698
30"
Intake
Pipe
$
140,205
$
101,045
36"
Intake
Pipe
$
145,285
$
106,125
Velocity
Cap:
Deep
(
200­
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
156,359
$
117,199
18"
Intake
Pipe
$
157,341
$
118,181
24"
Intake
Pipe
$
159,608
$
120,448
30"
Intake
Pipe
$
162,955
$
123,795
36"
Intake
Pipe
$
168,035
$
128,875
Velocity
Cap:
Very
Deep
(+
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
179,109
$
139,949
18"
Intake
Pipe
$
180,091
$
140,931
24"
Intake
Pipe
$
182,358
$
143,198
30"
Intake
Pipe
$
185,705
$
146,545
36"
Intake
Pipe
$
190,785
$
151,625
Velocity
Caps:
CuNi
Anti­
Fouling
Velocity
Cap:
Shallow
(<
60ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
110,859
$
71,699
18"
Intake
Pipe
$
111,841
$
72,681
24"
Intake
Pipe
$
114,108
$
74,948
30"
Intake
Pipe
$
117,455
$
78,295
36"
Intake
Pipe
$
122,535
$
83,375
Velocity
Cap:
Medium
(
60­
200ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
133,609
$
94,449
18"
Intake
Pipe
$
134,591
$
95,431
24"
Intake
Pipe
$
136,858
$
97,698
30"
Intake
Pipe
$
140,205
$
101,045
36"
Intake
Pipe
$
145,285
$
106,125
Velocity
Cap:
Deep
(
200­
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
156,359
$
117,199
18"
Intake
Pipe
$
157,341
$
118,181
24"
Intake
Pipe
$
159,608
$
120,448
30"
Intake
Pipe
$
162,955
$
123,795
36"
Intake
Pipe
$
168,035
$
128,875
Velocity
Cap:
Very
Deep
(+
350ft)
Single
Intake
Additional
Intakes
12"
Intake
Pipe
$
179,109
$
139,949
18"
Intake
Pipe
$
180,091
$
140,931
24"
Intake
Pipe
$
182,358
$
143,198
30"
Intake
Pipe
$
185,705
$
146,545
36"
Intake
Pipe
$
190,785
$
151,625