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A series of changes California officials made to their off-road diesel emissions rule, after the Associated General Contractors of America discovered significant errors in the measure, will save construction employers as much as $9 billion. Association officials outlined the changes and their potential impacts during a federal hearing today on whether California can start enforcing the revised measure in 2014. “Once we pointed out their initial errors, California officials made a good faith effort to modify their proposal to protect both the environment and the construction industry,” said Mike Kennedy, the association’s general counsel. “While we are not prepared to support California’s request [for federal approval], we do believe the state’s request can be fairly submitted.” Read the full release . The news was covered by the and .