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Remediation and subsequent fire …

The property shown below was used as a reconditioning facility from the early 1960s to the late 1970s. As part of the reconditioning process, any residual chemicals in drums were placed into open pits on the property, along with any drums that could not be reconditioned.

Our client purchased the facility in the early 1980s. In an effort to remove the soil source material, all of the disposal area was excavated. Approximately 5,000 drums were removed and properly disposed of off-site.

Fisher Arnold’s Houston branch was engaged to design, install and conduct all remediation activities based on the original assessments. As part of the remediation, all of the impacted soil from the excavation was placed onto an HDPE liner and aerated until concentrations met state requirements. After the soil was remediated, it was placed back into the original excavation.

In an effort to remediate the impacted groundwater, a soil vapor extraction / air-sparging system was installed. Additionally, the air-sparging wells were used periodically as injection points for hydrogen peroxide (chemical oxidation). This system operated continuously for about 4 years and resulted in the groundwater concentration of cis-1,2 dichloroethene dropping from an initial concentration of approximately 32,000 parts per billion (ppb) to below the Federal drinking water standards of 70 ppb. The cost for this radiation was approximately $3 million.

Based on the success of the remediation system, this site was being considered for closure but a fire occurred at the facility. The fire caused the release of numerous chemicals stored in above ground tanks. In addition, the fire suppression water (which had been contaminated by solvents released from the above ground storage tanks) flowed across portions of the site.

Fisher Arnold was then tasked to install and operate soil and groundwater corrective action for the volatile organic compounds (VOCs) not associated with the tank farm fire.

The system included: fifteen soil vapor extraction (SVE) wells and twenty-six air-sparging (AS) points. Lateral PVC piping from the newly installed wells and points to a blower and air compressor, respectively.

As a result of the remediation system, offsite groundwater has been remediated to the concentrations below the cleanup standards. Fisher Arnold is continuing work on the site by conducting semi-annual groundwater monitoring and submit semi-annual reports of the results.