Plans to increase commercial vehicle inspection capacity at the land port of entry along the Mexico border in Douglas, Ariz., are moving along as the U.S. General Services Administration awarded a $274.7-million design-build contract to Hensel Phelps Construction Co. for a commercial port near an existing U.S. Customs and Border Protection facility.

The dust has settled from a methane explosion last month that brought down the roof of a sludge concentration building at the Calumet water reclamation plant on Chicago’s far south side, but there is still uncertainty as to what triggered the blast.