Metrolinx says that as early as Saturday, crews at Mt Peasant Station will perform a major concrete pour within the work zones on the north side of Eglinton Ave east of Mount Pleasant Road. The concrete will form one of the permanent station structures underground. To ensure the integrity and continuity of the pour, work will begin as early as 6 a.m. and take approximately 12 hours to complete. Concrete trucks will stage on Eglinton, Mt. Pleasant and within the work zones. Two concrete pumps will be set up at the secondary entrance site. Traffic control personnel and/or a paid duty officer will be present while this work takes place.