Progress Update, Week of December 11th, 2023 During the week of December 11, the Gowanus Remediation Team (GRT) continued the RTA 1 Capping Operation. Armor layer placement continued this week. Mattresses were delivered and placed along the bed of the canal north of Union Street. Photos of construction activities are provided below. Excavator picking up mattress from transfer barge. Aerial view of mattress placement barges.