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Navy representatives say an existing agreement with the agencies to fix the tanks is working.
Sediments in the Elizabeth River contain heavy metals and visible creosote. The groundwater and soil at the site are also contaminated with creosote and heavy metals.
The Navy has estimated that the least expensive method of double-walling its fuel tanks that in 2014 spilled 27,000 gallons (102,000 liters) of fuel could cost between $500 million and $2 billion.