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Four Seasons Hotel & Legg Mason Office – Environmental Focus



Baltimore City, MD


“Award of Excellence,” by NAIOP, MD Chapter, High-Rise Office Building
“WaveMaker Award,” by the Urban Land Institute, Baltimore District
“Excellence in Concrete Award,” by ACI, MD Chapter

GTA-ESI provided engineering, operating, treating, and disposing of hexavalent chromium-impacted groundwater during construction of the $580 million, high-rise hotel/condominium and office building complex with a 30-story hotel and condominium tower (with capacity of construction to 45 stories), and a 26-story, 600,000-SF office tower with a 5-level, below-grade parking garage, located directly adjacent to the harbor waterfront.

During the construction of slurry wall, chromium-contaminated groundwater was encountered. GTA-ESI provided coordination with regulatory agencies and oversight for permitting, collection, treatment, and disposal of about 1.5 million gallons of contaminated water and sediments. GTA-ESI provided design, specification, and installation details for an instrumentation program to assess movement of the slurry wall and surrounding structures and pore pressures changes outside the slurry wall. The monitoring also included sampling of groundwater and sediments to assess contamination.

GTA-ESIs services allowed the client to identify and implement cost-effective solutions for geotechnical, environmental, and groundwater control issues. GTA’s prompt response/recommendations to troubleshoot and resolve issues during construction allowed the project to proceed without delays.

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