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Pier S Remediation Design and Soil Remediation, Port of Long Beach, CA
 

Accord Engineering led a $38M soil remediation contract at a 95-acre, former oil field before it was developed into a marine terminal. Dr.Dand Cheng of Accord led a design team, obtained two site-specific air discharge permits from the South Coast Air Quality Management District (SCAQMD), interacted with regulatory agencies, conducted a treatability study of chemical stabilization, completed design documents, prepared plans and specifications, and assisted the POLB with bid evaluation and contractor selection for the field implementation of soil remediation. The remediation was conducted under a Voluntary Cleanup Agreement with the Regional Water Quality Control Board and Department of Toxic Substances Control (DTSC). The major design elements included on-site remediation and landfill, geotechnical subsidence, excavation and dewatering, permitting compliance, traffic control, waste characterization and disposal, stormwater detention and discharge, and import-soil management. At the completion of this soil remediation contract, approximately 6 million tons of soil were imported for backfill at a peak rate of over 1,300 truckloads a day. Site security and trucking identification/management were the key issues of construction management.

In 2000 Accord became the consultant to the construction management team for technical and project management support and for preparing a site closure report. At the time of field remediation, certain project constraints were no longer an issue. Accord was able to save the POLB approximately $1.5M in construction costs by modifying the construction phasing plan specified in the bid documents.

During the field remediation, a truckload of imported soil contaminated with hexavalent chromium [Cr (VI)] was illegally dumped into the Pier S site. The construction management team responded immediately and reported to the regulatory agencies. Dr. Cheng cooperated and interacted with several investigation agencies, including the Department of Public Health, DTSC, and the Federal Bureau of Investigation. The illegally dumped soil was successfully removed and disposed of off-site as RCRA hazardous waste.

Overall, the project was completed successfully and safely, as well as within schedule and budget. This project was nominated to the Western Council of Construction Consumers by the POLB and won a Distinguished Project Award in 2001.

After the completion of initial soil remediation at Pier S, Accord was retained by the design firm and then the general contractor to perform additional environmental assessment and soil remediation work during the course of Pier S terminal development. In 2004, Accord conducted a site-wide soil gas survey for future terminal facilities. Soil gas probes were installed using direct-push technology. Soil gas samples were collected and analyzed for methane, hydrogen sulfide, and volatile organic compounds. The sampling results were used to assess whether an impermeable gas barrier and or active control would be required if the building footprint is impacted by soil vapor intrusion from below the building foundations.

The POLB awarded a contract to Ortiz Enterprise, Inc. in 2005 to construct the underground utilities and pave the site, as part of the property development into a marine terminal. As a subcontractor,Accord was responsible for the excavation, removal, and disposal of bug-farm material and treated soils that were buried within the areas for new storm drain, electrical, and utility systems. The primary chemicals of concern in the bug-farm material and treated soil included semi-volatile organic compounds, polycyclic aromatic hydrocarbons (PAHs), and Title 22 metals.

A total of 19,800 tons, or approximately 12,000 cubic yards, of material was excavated, removed, and transported off-site for disposal. The bug-farm material and contaminated soils were previously stabilized with Portland cement before being buried and were relatively hardened. These materials were excavated and transferred to a temporary stockpile within 50 feet of the excavation. Confirmation samples were collected from the side walls and bottom of excavations and from each stockpile of excavated material. The excavated material was transported either to Kettleman Hills Facility in Kettleman City, California for disposal if the material was RCRA Hazardous or to the Bradley Landfill in Sun Valley, California if non-hazardous waste. Air monitoring was conducted in accordance with the site-specific permit per SCAQMD Rule 1166 during the excavation and backfill activities.

After contract completion, Accord provided litigation support of a legal dispute between the prime contractor and the POLB. Accord provided all contract files, including field daily logs, in order to support the trial. Accord was able to provide the complete files within 2 days due to our well-organized, archival system.

 
More pictures from this very important project