By Nick Ackers
Two years ago this December,
Tasmanian-based Loss Adjuster Nick Ackers left Hobart on the Antarctic supply vessel “Aurora Australis”
for Casey Station, Antarctica, along with 24 crew and 53 expeditioners.
Nick travelled as a guest of the Australian
Antarctic Division (AAD) which Commonwealth Government Agency is responsible
for managing activities in the Australian Antarctic Territory, as part of the
100 year anniversary to celebrate Sir Douglas Mawson’s first Australian led
expedition to Antarctica.
Casey Station is situated some 3,500kms
south-west of Hobart on the eastern coast of Antarctica just outside the
Antarctic Circle. Whilst limited air travel is available to Casey via the
Wilkins Ice Runway, the AAD’s invitation to travel by sea enabled Nick to gain
a much better perspective of the environmental and logistical challenges faced
when operating in Antarctica.
Nick’s role includes adjustment of losses
arising from fuel oil spills in the Sub-Antarctic (Macquarie Island) and the
42% of Antarctica controlled by the Commonwealth of Australia. It must be borne
in mind that Antarctica is the coldest, driest and windiest continent on which
human activity takes place. Living in that environment brings with it many
challenges many of which can be life threatening.
The AAD is now a world-leading authority on
managing fuel oil spills in Antarctica. This has developed from the
requirements of the Antarctic Treaty that each country operating within the
Antarctic Continent be responsible for cleaning up their own contamination.
Some seven days after leaving Hobart the
Aurora Australis sailed into the bay overlooked by Casey Station situated on
the ridge line above. However, due to deteriorating weather conditions and the
poor anchor holding ability in the bay, the Aurora Australis headed out to sea
again for two days to ride out the storm. This was Nick’s first example of
weather-induced delays when operating in Antarctica. The Aurora Australis
returned to Casey Station and commenced unloading materials, supplies,
equipment and personnel by barge from the ship to the nearby wharf; although
this process was further dramatically delayed due to an ice flow which had
blown into the bay during the recent storm, impeding efforts to discharge the
cargo.
Upon landing ashore pedestrians were
required to walk about 1km up to the Station which is a series of coloured
buildings, the largest of which comprises living quarters, dining, social and
accommodation facilities known as the “Red Shed” given its bright red colour.
Once at Casey Station, Nick was met by a
team of three scientists principally involved in managing the fuel spill remediation
site, who were stationed at Casey Station for approximately three months.
The Casey Station fuel spill involved some
10,000 litres of “Bergen” fuel having leaked from a ruptured delivery pipe
between the main generator building and a holding tank external to the
building. Bergen fuel is a heavier fuel
which has since been replaced by SAB (Special Antarctic Blend) diesel.
Fortunately the spill had not migrated far and was initially contained by
installing an impermeable barrier within the permafrost to about 1 metre deep
around the down hill sides of the spill area.
Eventually the contaminated ground was
excavated and placed into mounds formed on prepared ground. Preparation of this
ground involved constructing a geo-synthetic clay liner on which a high density
(impermeable) poly liner was placed to prevent any escape of fluid.
Once the pads were constructed the
contaminated material was placed/formed into mounds. Within the mounds were a
series of pipes to provide aeration, and covering the mound is geotextile
fabric.
Bioremediation involves the artificial
stimulation of microbial activity to eat away hydrocarbons (fuel) within the
contaminated material. Whilst the microbes are naturally occurring they are effectively
dormant for most of the year due to the very low temperature. Therefore, and
given the limited time available for this to occur (generally November –
February), the AAD has developed a system of pumping hot air and adding
fertiliser nutrients (both liquid and granulated) which are incorporated into
the mounds. Furthermore, as the summer period temperatures reach above 0°C the
mounds are mechanically turned to improve aeration. This can occur 2-3 times
per season.
Due to the limited time frame each season
the bioremediation process can take anywhere between 7-10 years to sufficiently
decontaminate the mounds during which time Scientists, at least during the
summer season, are actively monitoring, sampling, turning and testing the
extent of the contamination and ensuring no escape of hydro carbons occurs into
the surrounding pristine area.
Nick was away in Antarctica or travelling
to and from Hobart for a total of five weeks, spending 2 days and 3 nights on
the Antarctic Continent. The restricted availability of accommodation at Casey
Station during the summer period when staff numbers can be in excess of 100 is
one of the main limiting factors in the performance of non-essential activities
on the Antarctic Continent. However, the logistics of moving equipment from
Australia to Antarctica, generally via the Hobart-based AAD and staff is a very
costly exercise and one which requires detailed planning and budgeting to
minimise costs and maximise returns.
The above is presented as an example of
Technical Assessing’s expertise particularly with respect to handling major
losses involving technically challenging cases in remote locations combined
with long tail demands.