Environmental Cleanup – Seaplane Lagoon; RAB Tour; Lead; Groundwater

Sun sets on dredging project for this year - to resume in 2012. Fence is down on east side of lagoon, which will allow sunset viewing and bird watching throughout the remainder of the year.

Seaplane Lagoon dredging contractor fails to meet deadline

Seaplane Lagoon dredging barge is gone, not having completed the job on time.

The Navy was expecting the contractor to complete the dredging of both the northeast corner and the northwest corner of the Seaplane Lagoon by mid-April prior to the arrival of the endangered California Least Terns.  The terns nest on the Wildlife Refuge and feed in the Seaplane Lagoon and nearby waters.  It is illegal to disturb them while feeding and nesting.  The contractor completed the northeast corner, but work was halted before starting on the northwest corner due to the arrival of the Least Terns. 

The dredging will resume in early 2012 and be completed by mid-year.  It is unclear at this point whether the Navy will incur an additional expense for the dredging operation, since it was not completed by the deadline, and the dredging equipment had to be demobilized.   

In response to a question about whether the Seaplane Lagoon dredging contractor is expected to complete the project within the budget allocated for this project, the Navy’s Environmental Coordinator for Alameda Point, Derek Robinson, said, “The Navy is optimistic the project will be completed within the allocated budget.  The Navy and its current contractor are presently negotiating a change to scope to allow the future dredging of the northwest corner of the Seaplane Lagoon to be performed under a new contract.”  In response to a question about whether the demobilization of the dredging operation until 2012 is going to lead to a cost overrun, or will the contractor absorb the cost, Derek Robinson reiterated the above statement and went on to say, “Until the negotiations with the current contractor are complete and the new project is awarded, the total project cost will not be known.”

The existing piles of dredge soil on the tarmac near the Air Museum and Bladium will be hauled away this summer.  They will be tested for radium-226 and other contaminants in order to determine where they will be disposed of.  The fencing along the eastern side of the lagoon has been removed, and the dredging barge is gone.

Installing steel sheet pilings in lagoon prior to removing drain pipe, soil, and concrete

 A separate project on the western side of the lagoon is continuing.  It involves removing the last leg of the old sewer drain line that was removed due to radium-226 contamination.  A steel barrier has been constructed in the lagoon to prevent contaminants from entering the water during the project.

Lead in soil

Work has begun next to the Collaborative housing to remove lead contaminated soil.  Sidewalk sections have been removed and the area fenced off. 

Sidewalk removal next to Collaborative housing to remove lead-contaminated soil. May 2011.

Lead-contaminated soil removal project begins next to Collaborative housing

RAB Tour of Cleanup Sites

The annual Navy-sponsored tour of cleanup sites will be held this year on Saturday, July 16 from 9 am to 11 am.  Space is limited, so please RSVP by July 1.  More information is on the announcement.

Groundwater cleanup project starts next to Building 5 – see pictures below

Boring holes for groundwater remediation next to Building 5 in June

Hole saws for cutting through concrete to install wells for remediating groundwater.

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