ATTACHMENT
1 Summary of
Questions and Answers August 31,
2006 Public Presentation on Seawater Conversion Vessels by PBS&J |
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Question |
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Response |
1. |
Describe the visual impacts
of the ship. |
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Ship would operate 5 to 10
miles from shore. At night, shuttle
ships would deliver desalinated water to the docking station for off-loading. |
2. |
Is there an off-shore, ship
based desalination facility such as you are proposing in operation
currently? |
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No. There are a few similar facilities that
produce 1 million gallons per day (MGD) but no vessels that are capable of
producing the larger quantity of water that would be needed on the |
3. |
Do you currently have a
contract for construction and operation of a project the size that would be
needed for the |
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No. This type of project is not in existence
anywhere. Some projects are planned,
but none have been built. If a
project were to be constructed on the |
3. |
How are the ships
re-fueled? |
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Refueling vessels are sent
out to the ship based facility to re-supply it with fuel and provisions for
the crew. |
4. |
What type of fuel is used
by the ships? |
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Bio-diesel and marine gas
oil will be used. The primary fuel to
be used is bio-diesel that is derived from soybeans or rapeseed. |
5. |
How much desalinated water
can be produced by one ship? |
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Approximately 200 MGD or
more, which is about 2,000 acre-feet per year. Envision 25,000 acre-feet per year for |
6. |
Can the process be shut
down and started-up again as needed?
For example, more water would be needed in the summer months than in
the winter. |
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The more water you produce
with the same facility, the cheaper it is to operate. Envision that you would contract with other
agencies for purchase of the water.
Sell water to other agencies in |
7. |
Has |
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A shorter version of the
presentation was given to |
8. |
How many trips would the
shuttle ships make each day in order to off-load the desalinated water. |
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Each shuttle ship has a
capacity of 10 to 30 million gallons.
It takes about 10 hours to offload a shuttle ship. The shuttles could offload about every 2 or
3 days and only in the evening. A 500
foot long shuttle ship has a capacity of approximately 15 to 18 million
gallons. |
9. |
Would the commercial docks
in |
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Yes. The offloading arms could be installed and
constructed there. |
10. |
Has this proposal been
presented to the National Marine Sanctuary (NMS)? |
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No. Preliminary review of their rules indicates
the project would be allowed by the NMS.
However, need clarification of the rules from the NMS. Refer to slide 71 and 72. |
11. |
Can the brine discharge be
offloaded to another ship and disposed of at another location? |
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Yes, that might be
advisable in the National Marine Sanctuary boundaries. The intent is to operate outside of the
Sanctuary boundaries. So there would
be no need to dispose of the brine at another location. |
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12. |
If public ownership of the
project is desired, are your ships for sale? |
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We don’t need to make a
profit from sale of the water. If you
want to purchase the ships, we will sell them to you and then service the
units. You could get low-cost public
financing to purchase the units.
Initially we could bring in crews to set up the equipment, operate the
ships and eventually render all operations to you. We do have global intellectual rights to
the technology. We do not charge a
royalty. |
13. |
What is the timeline for
development of the project? |
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After financing is approved
and all permits are issued for the project, it would take 18 months for the
project to be built and operational. |
14. |
Have you analyzed the |
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In |
15. |
Are the on-shore facilities
included in the cost estimate? |
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A side-by-side capital cost
comparison of a ship-based system and a land-based system that was not
co-located show that the ship-based system capital cost is generally 25% to
30% lower than a land-based plant. For
a 50 MGD project the cost for a ship-based system is 15% to 20% lower than
land-based. That is twice the size
that would be needed on the |
16. |
How much fuel is required
for one round-trip by a shuttle vessel? |
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The bio-fuel could cost
$597 per metric ton minus a 30% federal tax credit. So the cost could be $700 to $1,000 per
trip. Could use 1 to 4 metric tons a
day depending on distance traveled. The
ships are powered by electricity, measured in kilowatts. So the number you requested will need to be
calculated. |
17. |
Explain how seawater
conversion technology results in lower levels of entrapment and entrainment
than with other methods. |
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The process will be located
at least 10 miles from shore. The
water quality is better there which will minimize entrapment and
entrainment. Intake pipes will be 10
feet in diameter and the velocity will be one-half a second. Slots on the well screens will be sized at
one millimeter. Intake will be set
below sunlight penetration level which is 40 to 4,400 feet depths. |
18. |
Do you have examples of
cost and viability for projects that have been developed by other agencies? |
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We are working with
Metropolitan Water District of Southern California. They concluded the process was technically
feasible with no fatal flaws. They
have not decided if Metropolitan or a member agency should build the conversion
vessel. In your case, there could be a
two-phased project. We could build the
facility and then in 1 to 3 years transfer it to you. There would be a performance bond. |
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