This is the latest in a recent series of belated reports emerging showing how environmental breaches went unreported in Gladstone Harbour after the onset of the major dredging program for access to the LNG plants under construction on Curtis Island.
The Gladstone Ports Corporation recently claimed there was a "small leak" in the reclamation bund wall containing acid sulphate mud and a cocktail of heavy metals and other industrial deposits laid down over about 50 years and never previously dredged.
Fish, turtles, dolphin and dugong were sick and dying, people were hospitalised with severe infections but the authorities claimed it was all due to the flood in 2011, one of the most moderate floods on the Queensland coast at that time.
This article in The Brisbane Times shows one example of how things went wrong, but we weren't told when it was happening:
Two senior
engineers have told exactly how the controversial bund wall in Gladstone
Harbour leaked in 2011 and 2012, letting dirty dredge spoil flow out to the
Great Barrier Reef.
A
protective geotextile cloth that was originally supposed to be built inside the
porous bund wall, was instead laid on the inside wall of the bund wall.
It was
half the thickness of the originally-designed geotextile cloth and simply tore,
crumpled and "ballooned away" from the bund wall as the tide rose and
fell in 2011 and 2012.
Vision demonstrating failings in the
bund wall at Gladstone Harbour. Photo: Supplied
This left
large holes in the bund wall for the dredge spoil to leak through on the rising
tide in Gladstone's Harbour.
After
seeing the presentation on Friday, the Great Barrier Reef Marine Park Authority
is asking questions about the expected scrutiny of future dredging operations
in Queensland.
On Friday,
GRMPA decided not to give a permit to allow dredging spoil to be dumped in reef
waters until further tests are finished in late January.
Vision demonstrating failings in the
bund wall at Gladstone Harbour. Photo: Supplied
Gladstone
Harbour's bund wall was built in 2011 because 25 million tonnes of sediment had
to be dredged to make way for the harbour expansion for the liquid natural gas
industry.
The wall
was needed to protect marine fauna (largely fish and turtles) and flora
(largely sea grass).
The
Gladstone Harbour result - as shown by experienced engineers Bill Service, a
dredging supervisor with QGC; and Warren Hornsey, an engineer who works with
geosynthetic materials - was explained to Griffith University students in
August for $5.
Their
presentation: "Gladstone Harbour Dredged Spoil Bund Wall - What Went
Wrong" was presented at Griffith's Gold Coast campus on August 21.
The bund
wall failure in 2011 has never been explained in detail to journalists, who
have questioned the conditions in the harbour for two years.
The pair
found:
the
rising tide caused the "geotextile cloth" to split horizontally;
in
some cases the geotextile was not secured at the bottom and simply lifted up;
"there
were crumpled areas, tears, rips and holes due to the water movements."
Bill
Service and Warren Hornsey, say the leaking was caused by problems with the
lining - which was thinner than originally proposed - and not being placed
within the bund wall.
"This
resulted in a porous wall, which relied on a geotextile fabric lining material
to prevent fine dredged spoil from leaking through the wall," the authors
said.
"Unfortunately,
problems arose with the lining, resulting in significant leakage of dredged
spoil."
A
spokeswoman for Abigroup said they met its contract requirements for the
project.
“Abigroup
delivered on their contractual obligations in relation to the Gladstone Port
Corporation Seawall project,” said an Abigroup spokesperson.
The
Queensland Government said Abigroup was not fined by the previous state
government,or the existing state government for the leaks.
"No, Abigroup
was not fined," a spokswoman said.
"Abigroup
was a contractor engaged by the Gladstone Port Corporation (GPC)," she
said.
"Any
breach of tender would be a commercial matter for GPC to consider."
A
Gladstone Port Corporation spokeswoman said she was unable to comment on why
the original bund wall design was changed, or whether Abigroup was ever fined
for the dredge spoil leaks.
GBRMPA
this week refused to grant the permit to allow three million cubic metres of
dredge spoil to be dumped in Reef waters and extended a decision until 31
January 2014.
Federal
Environment Minister Greg Hunt has approved dredging to expand Abbot Point coal
port but GBRMPA must issue a permit before dredge spoil can be dumped.