The state governor authorized the public notice for the works on the northern stretch of the Rodoanel Mário Covas beltway.
A local lawmaker leaves open the possibility of carrying out as a PPP, after the project fizzled out last year amid doubts about passenger demand and a lack of political commitment.
An appeals court stated that the Antofagasta health service must pay around US$6mn to consortium Comsa-Pilasi for "unilaterally" terminating its contract to build the US$200mn project.
Rio Grande do Sul state government will keep a controlling stake in the bank, but will sell an undisclosed number of shares.
The project is demanding an investment of around US$45mn.
EcoRodovia has entered exclusive acquisition talks with MGO Rodovias, according to a local paper.
The Brazilian construction giant's name and reputation has been shattered by the Lava Jato corruption scandal.
The state water utility will provide potable water to the city for the next 30 years.
The investigation is looking into possible corruption committed during the tender and construction of the so-called VIP government tower in Monterrey, capital of Nuevo León state.