Project Tags: Manufactured Gas Plants

Challenge GZA performed turnkey remediation of a former manufactured gas plant (MGP) site where soil impacted by coal tar had contaminated groundwater. Regulatory compliance, environmental impact during construction, and cost effectiveness were key client considerations. Solution After GZA’s site investigation, contaminant delineation, and remedial alternative evaluation, the selected remedy was in-situ stabilization/solidification (ISS) of contaminated … Read more

GZA is managing the investigation and/or remediation of four former manufactured gas plant (MGP) sites in the Mid-Atlantic region. Challenge The hydrogeologic conditions are complex and vary dramatically at each site. Active use of several sites and third-party ownership requires additional planning and collaboration. The on-site presence of NAPL, potentially impacting an adjacent water body, … Read more

Challenge A confidential client selected GZA to perform turnkey remediation of a former manufactured gas plant (MGP) where soil impacted by coal tar had contaminated groundwater at the site. The site’s location in a densely populated area necessitated additional monitoring. Compliance with the Massachusetts Contingency Plan (MCP), cost-effectiveness of the remedy implementation, and environmental impact … Read more

GZA delineated MGP constituents at this former MGP site, identifying contaminants in soil between layers of silt that extended very deep into the groundwater in the Site’s residential neighborhood. Challenge To isolate this residual product and prevent it from acting as a continued source to impact groundwater, GZA designed and installed a groundwater cutoff wall … Read more

Following closure of this former manufactured gas plant (MGP) which had operated between 1881-1953, residual coal tar byproducts were identified within the Site’s soils and shallow groundwater. As a sub consultant to the firm that had delineated the contamination, GZA developed a remedial approach that was funded by an EPA Revolving Loan Fund and the … Read more

Challenge Three independent remediation contractors had already been retained by the Owner on this complex former MGP site when GZA was contracted as Construction Manager as Agent. The contractors’ scopes of work included demolishing buildings; relocating an active rail line; re-routing subsurface utilities; relocating a non-interruptible high-voltage power distribution lines to a local hospital; reclaiming … Read more

This former MGP Site is located in a historic, seasonal resort community adjacent to a tidally-influenced wetlands. The utility company was under a consent order to complete the remediation. Challenge To protect the vibrant tourism economy of this residential/commercial ocean-side community, remedial construction was allowed only in the off-season. Obtaining access agreements with multiple residents, … Read more

Challenge GZA’s remedial design at this former manufactured gas plant (MGP) needed to address coal-tar-impacted soils to depths of up to 35 feet below ground surface (bgs).   Solution GZA first evaluated a remedial action involving excavation and disposal of tar-impacted soil to depths of up to 35 feet bgs and below groundwater in soils … Read more