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Contaminated Site Investigation and Cleanup

Environmental assessment and compliance - two people in hard hats working outside

We are the premier service provider for contaminated site investigation and cleanup on the west coast. Since our founding in 1998 we have been engaged on over 1,500 separate sites to characterize and remediate hazardous substances in soil gas, soil, groundwater, surface water, and sediments.

Farallon’s experience on contaminated sites includes characterization, feasibility testing, and remediation of complex commercial and industrial sites, historical landfills, and petroleum releases. 

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Over the past 20 years we have developed a top-tier team of technical professionals including experts in contaminant fate and transport characterization, modeling, and remediation engineering who have successfully developed and implemented cost-effective approaches for remediation and cleanup. Today, we employ a premier team of leading consulting experts in the industry for characterization and cleanup of releases associated with chlorinated solvents, per- and polyfluoroalkyl substances, petroleum hydrocarbons, and landfill gas mitigation.



Remedial Investigation

Our team has successfully completed Remedial Investigations at numerous commercial, industrial, Brownfield, and agricultural properties to characterize the extent and magnitude of contamination to various media. These include impacts to...

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Vapor Intrusion Assessment and Mitigation

Vapor intrusion is rapidly becoming a key issue of concern for owners and prospective buyers of commercial and industrial properties – especially those with historical dry cleaning operations. The effect of changing regulatory...

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Feasibility Studies and Remedial System Design

Regulatory agencies often require studies, which are a useful first step in the design process. We conduct Feasibility Studies to evaluate the comparative effectiveness, practicality, timeliness, and costs for potential remedial...

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Environmental Forensic Assessments

We produce scientifically defensible outputs to assist attorneys, insurance companies, and industrial and commercial clients in better understanding their potential liability with upland and water facilities.

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Regulatory Strategy and Cleanup Goal Development

To help our clients meet their project goals, we put our regulatory expertise to work to develop and implement practical, strategic solutions to a wide variety of local, state, and federal environmental regulatory issues. We are proud of...

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Emerging Contaminants

We are among the leading firms in Washington State working with several parties to evaluate and ultimately remediate PFAS releases at multiple locations.

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Sediment Services

We have specialized expertise in designing sediment investigations where sediments have been impacted by a wide range of contaminants including metals, refined petroleum compounds, polynuclear aromatic hydrocarbons, pesticides, and...

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Aerial Inspection and Mapping

Our Federal Aviation Administration-licensed pilots capture high-resolution aerial imagery, which we use to monitor environmental construction activities and streambed restoration work. By incorporating a drone into data collection, we...

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Project Experience

Silver Cloud Hotel - Stadium

Silver Cloud Hotel – Stadium

To delineate the extent of the contaminated soil and groundwater, Farallon initially completed a...

PFAS Characterization and Remediation

PFAS Characterization and Remediation

Farallon has been leading an investigation to evaluate releases of per- and polyfluoroalkyl substances...

pesticide contaminated site

Able Pest Control

Farallon successfully completed the cleanup of a pesticide-contaminated site in a residential area of...

Historic Skykomish School

Historic Skykomish School

A client’s former maintenance and fueling operations resulted in petroleum hydrocarbon contamination...

California Property Cleanup

California Property Cleanup

The Phase I ESA identified extensive petroleum staining on the unpaved surface and in the vicinity of...

Farallon VOC Monitoring Probe

Farallon Volatile Organic Compound Monitoring Probe

Farallon was retained by a property owner to install the patented Farallon VOC Monitoring Probe and...

Buzz over Mission Clay

In-Situ and Ex-Situ Remediation Services at Former Mine

Farallon worked with multiple oversight agencies to characterize an off-site hydrocarbon plume that...

Mare Island

Sediment Removal and Bioremediation Reactive Wall at Mare Island

Following a feasibility study that identified the best solution to remediate the concerns, Farallon...

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