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Historic Skykomish School

Historic Skykomish School

To meet the needs of a nationwide transportation client, Farallon evaluated and implemented a unique thermal remediation program that used hot water flushing to facilitate nonaqueous-phase liquid recovery, soil vapor extraction to recover volatile organic compounds, and a sheet pile barrier for hydraulic containment.

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A client’s former maintenance and fueling operations resulted in petroleum hydrocarbon contamination beneath a historic school building. Farallon evaluated various remediation approaches and, after comparing the relative performance of each approach against school-specific criteria, Farallon and the stakeholders chose a combination of remediation technologies designed to meet the client’s needs, fulfill the school’s requirements, and satisfy the Consent Decree with the Washington State Department of Ecology.

Farallon prepared construction plans and specifications and provided construction observation and compliance monitoring during installation and operation of the hot water flushing remediation system. The remediation system was installed during an aggressive 10-week construction schedule to accommodate school operations. The system operated during two summer seasons without disrupting school operations. Farallon used several lines of evidence to demonstrate that the remediation program had achieved the cleanup goals, and Ecology agreed that remediation could be terminated. Farallon conducted compliance monitoring during the remediation system decommissioning and prepared a construction completion report documenting system decommissioning and site restoration activities.

"This was a complicated project with many stakeholders," said Farallon Senior Geologist. "The achievement of cleanup goals within two treatment seasons required a coordinated team effort, with every team member firing on all cylinders. It is gratifying when stakeholders' goals are aligned and all the pieces fall into place for a successful outcome."


Services Utilized

Contaminated Site Investigation and Cleanup

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...

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Engineering Services

We take a collaborative approach, working with our clients to provide practical engineering solutions to achieve their project goals. Our engineering expertise is extensive and includes a broad spectrum of services.

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Feasibility Studies and Cost Estimates

Our engineers have expertise in a wide array of remediation technologies and have performed numerous Feasibility Studies for sites in the western United States. These Feasibility Studies evaluate the comparative effectiveness,...

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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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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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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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Remediation System Design and Operation

We also operate and maintain remediation systems at client sites. Our engineers rely on our extensive experience to monitor and optimize system performance and minimize the time to achieve cleanup goals. Among the remediation systems we...

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Treatability and Pilot Studies

These studies utilize bench-scale and field testing to optimize existing treatment systems and to inform the development of new treatment strategies. Our engineers work with specialty contractors and laboratories to ensure that...

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