But in the early 1990s Roger began remediation.
Mr Horta-Osorio said: "When we began the remediation programme, it was thought this would cost the entire industry around £4.5bn.
Now that Google realized what has happened (or, less charitably, now that it has been caught), Mohan said it has "begun the remediation of that process".
Nick Wright, the district council's cabinet member for planning, said: "No work will begin until the remediation reports have been fully assessed and the experts can say in no uncertain terms that the land meets the stringent standards and is fit for homes to be built on".
Remediation can begin early.
"We need to inspect the center in order to begin necessary cleanup and remediation work so that we can transition the facility back to a community center space," the officials wrote, adding that on Monday they planned to meet with people from the center "to discuss the cleaning process and next steps in restoring services".
A new report, published by the Washington-based Bipartisan Policy Center, argues that the White House's Office of Science and Technology Policy (OSTP) should begin to coordinate "climate remediation" studies across a range of agencies.
Because the proceedings have been held up by appeals, there's no set date yet for the remediation to begin.
The E.P.A. mandated a Superfund cleanup of the mine area by Ford in the nineteen-eighties, and ordered further remediation beginning five years ago, leading to the removal of an additional thirty-five thofsludgeons of sludge and soil.
The final phase of remediation began in August 2009, and ABB anticipates spending a total of $140 million by the time the cleanup is complete, according to Bob Fesmire, a corporate spokesman.
