- Remediation & Closure - Newark
Burns & McDonnell conducted site characterization and corrective action at a trucking terminal to define the extent of total petroleum hydrocarbon (TPH)-impacted soil and groundwater, and to address vadose zone soils containing free-phase hydrocarbon product.
Over the years, Burns & McDonnell installed monitoring wells, performed groundwater monitoring activities, and prepared and managed a remedial design and corrective action plan for the site. Burns & McDonnell also developed and implemented a chemical remedial design to address elevated benzene levels.
- Environmental oversight and sampling
- Agency reporting
- Comprehensive soil characterization
- Monitoring well installation
- Remedial design
- Chemical injection pilot test
- Investigative derived waste management
Prior to 1984, the southern portion of the site was occupied by a tank farm containing six aboveground waste oil tanks (ASTs) with a combined capacity of 750,000 gallons. An oil transfer spill occurred as a result of a mechanical hose failure. Although visually affected soil and petroleum products were removed after the release, additional site remediation was not conducted.
Between 1984 and 1994, the facility operated as a trucking terminal. During July 1984, one of the ASTs was observed to be leaking. The extent of the leak and volume of product released were unknown. As a result, numerous site investigations, including the installation of groundwater monitoring wells, were performed. The results of the investigations showed the presence of TPH-impacted soil and groundwater beneath the southern portion of the site.
In 1999, Burns & McDonnell installed additional monitoring wells and commenced quarterly groundwater monitoring activities. Burns & McDonnell also conducted several phases of site characterization activities within the southern portion of the facility, as well as along an adjacent railroad spur. Analytical results showed impacted soil and groundwater within the vicinity of the former ASTs. Free-phase petroleum hydrocarbon product was also observed in vadose zone soil. Analytical results from quarterly monitoring also showed the presence of volatile organic chemicals (VOCs) in groundwater.
In 2001, Burns & McDonnell prepared a remedial design and corrective action plan (CAP) to address the excavation, transportion and disposal of impacted soils. Cleanup goals were negotiated with and approved by the Alameda County Water District (ACWD). Bid specifications were prepared for contractor procurement purposes. Burns & McDonnell managed remedial construction activities. During corrective action, 4,800 tons of impacted soils were removed and more than 100,000 gallons of impacted water were transported to licensed disposal facilities. Upon completion, the site was restored to match existing grade.
Elevated benzene levels had prevented a no-further-action award, so in 2008, Burns & McDonnell submitted a chemical remedial design to the ACWD. In August 2008, Burns & McDonnell conducted a chemical injection pilot test to evaluate the effectiveness of the chosen chemical amendment StimulOXTM. A six-month monthly performance monitoring program was implemented immediately after the pilot test was performed in February 2009. In December 2010, Burns & McDonnell completed a second-round injection of StimulOXTM to address residual benzene concentrations in groundwater. Another six-month monthly performance monitoring program was implemented immediately after the injection.
Since the monitoring program's completion in June 2011, Burns & McDonnell completed semi-annual groundwater monitoring events, documenting the decline of benzene concentrations in groundwater and natural attenuation of residual petroleum impacts in groundwater.
In 2014, when the local regulatory agency was unyielding about concurring with site closure, Burns & McDonnell successfully appealed to the state of California.