BAYFRONT REDEVELOPMENT

ENTACT completed a comprehensive multi-phase remediation of a 100-acre industrial site located near a river, preparing it for mixed-use redevelopment. This project focused on the removal of hazardous materials, groundwater management, and site restoration to ensure compliance with environmental standards.

Phase 1: Central Area Remediation

The first phase spanned three and a half years and concentrated on the central portion of the site. This phase involved the excavation and removal of significant amounts of chromium ore process residue (COPR) and chromium-impacted materials, which posed environmental risks. The team implemented effective groundwater management strategies to reduce water content in the excavated materials, ensuring a more efficient remediation process. In Phase 1, our team:

• Excavated of 932,000 cubic yards of chromium ore process residue and chromium-impacted material
• Disposed 53,000 truckloads of contaminated waste off-site
• Designed, installed, and operated a groundwater extraction system
• Imported, placed, and compacted 880,000 cubic yards of clean backfill to achieve final surface grades

Phase 2: Northern and Southern Areas

The second phase was completed over a three-year period and focused on the northern and southern areas of the site. This phase included the management of groundwater through advanced extraction systems, which allowed for effective control of water levels during the excavation of contaminated materials. Additionally, significant capping systems were constructed to ensure long-term site stability and safety. During Phase 2, ENTACT:

• Implemented a vacuum well point and deep well groundwater extraction system
• Placed more than 400,000 cubic yards of surcharge materials for subgrade consolidation
• Installed more than 180,000 square feet of epoxy-coated sheet pile with grouted or sealed interlocks
• Removed 250,000 cubic yards of overburden and chromium-impacted soil
• Imported, placed, and compacted 285,000 cubic yards of backfill to restore excavated areas to subgrade elevations
• Constructed two, 10-acre capping systems with geosynthetic and cover soil components, including a gas venting and groundwater extraction system within the capped areas

Through these phases, ENTACT successfully addressed environmental concerns and set the foundation for the future development of the site as a valuable community asset.