Progress Update, Week of May 22nd, 2023 During the week of May 22, the Gowanus Remediation Team (GRT) continued the RTA 1 Capping Operation. Material placement continued north of Union Street. The cap and ventilation system at the Carroll Street Bridge was completed. Photos of construction activities are provided below. Capping material placement in progress north of Union Street. Continued capping material placement in progress north of Union Street.