RICHMOND — Virginia lawmakers on Wednesday voted against an amendment from Gov. Bob McDonnell that local officials said could delay improvements of leaky oil storage tanks at a Fairfax City site.

In response to problems at the Pickett Road tank farm in Fairfax City, Sen. Chap Petersen, D-Fairfax, and Del. David Bulova, D-Fairfax, pushed through the General Assembly legislation that would give tank-farm owners until 2021 to restore tanks built prior to 1992 so they conform to current design requirements, like having double bottoms to prevent leaks.