No invasives found on Endeavour jack up rig

By Naomi Klouda
Homer Tribune

An environmental review of the jack up rig Endeavour found that it contains no live organisms or invasive species that could pose a threat to Kachemak Bay.
URS Alaska senior biologist Dave Erikson, the consultant based in Homer and hired by Buccaneer Alaska on Sept. 8, concluded his report by saying: “The extended period of time the rig was in dry dock, approximately six months, appears to have been long enough to kill whatever invertebrates and algae had become attached during or before the time it was cold-stacked.”
The 15-page environmental review was released to the Homer Tribune today, Friday.
The Endeavour, formerly called the Adriatic XI, was left moored in 40-50 feet of water in Malaysia in 2009, and remained there until it was purchased in a joint agreement between Buccaneer and the Alaska Industrial Development and Export Authority in 2011 for $68 million. It was dry-docked six months while undergoing repairs and upgrades in Singapore.
“In addition, after spending months in dry dock, the rig underwent its 30 day journey to Alaska on the deck of the heavy lift vessel (out of waters) allowing very little opportunity for new biota to become attached. With the rig and its legs out of the water for this extended period of time, survival of any attached marine biota on structures would be highly unlikely, especially soft-bodied organisms.”
All this time out of water was a dominant factor in killing marine species, Erikson found.
“From the size of the shells, the attached oyster shells appeared to be from mature specimens at last a couple of years old. The number of species of oysters or barnacles present on the rig and their age was not determined… Some of the shells may have been from an earlier period in the rig’s 30-year history of operation,” the report states.
The survey included numerous photos of what was found in Erikson’s examination of the jack up rig. He found several species of dead oysters on the bow leg of the jacking guide slot, under gray paint. Dead barnacle shells were on the starboard leg, most of which had been painted over. Shell debris was on the catwalk out to a manhole on top of the spud can. This was likely collected from cleaning the legs of encrusting marine biota prior to painting the legs, Erikson found. He also found encrusted marine organisms, a grayish film, on a bow leg. And he found encrusted juvenile muscles and calcareous worm tubes on a structural support member.
Erikson’s first day of survey method focused on the three legs of the rig, particularly the lower portions just about at the waterline. Photographs and sample shells were taken from these. The second day focused on the spud cans located on the bottoms of the legs. These areas had not been recently scraped and painted like the rest of the legs and marine growth was evident. Collecting samples required the help of a trained climber, who scaled the main deck by ladder wearing a climbing harness. Close up photos of a film of encrusted marine life were taken and a sample from two areas was collected for microscopic examination.
The subject of non-indigenous species making way into Kachemak Bay is one that concerns officials and members of the environmental community. Invasives are currently uncommon in the bay, Erikson wrote, but changes in environmental conditions such as water temperature may make this area more susceptible to marine species from elsewhere. “Most of the research effort has focused on ballast water as a mechanism for transport, but hulls of ships and barges are also an important mode of transport that can introduce species to an area,” the report states.
Erikson recommends that Buccaneer:
•Remove all loose shell debris from all areas near the legs
•The spud cans, supporting structures and catwalks should be scraped and painted at the same time as other parts of the legs to minimize the risk of introducing non-indigenous species
•The four-inch gap near the jacking guides should be cleaned of shells and then monitored for any build up after the drilling season
•The leg structures should be cleaned of attached marine biota after drilling season this year to minimize potential for transport of non-indigenous species.

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Posted by on Sep 21st, 2012 and filed under Headline News. You can follow any responses to this entry through the RSS 2.0. Both comments and pings are currently closed.

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