This Construction Completion Report describes the installation of sub-slab depressurization (“SSD”) systems at two buildings at an industrial facility located at the Brunswick facility. The two buildings are commonly referred to as the Stillhouse Control Room and the Chemical Plant Control Room and Laboratory. Hercules is undertaking various environmental activities at the Brunswick facility pursuant to the corrective action program under the Resources Conservation and Recovery Act (“RCRA”) as administered by EPD, including assessing the potential for historical releases of volatile organic compounds (“VOCs”) to enter buildings that are determined to be potentially susceptible to vapor intrusion. Based on the results of extensive investigation activities that have been conducted in a phased manner, Hercules elected to undertake preemptive mitigation steps as a precaution to address potential vapor intrusion at the Stillhouse Control Room and the Chemical Plant Control Room and Laboratory. Both SSD systems are now fully operational. This CCR describes the work that was performed to construct and install the SSD systems, and to place those systems into operation.