Working for the Regulated

Aspect drives environmental projects to an end-point – acquisition, compliance, cleanup, closure, and cost recovery. From the start, we know that clients want to understand their options, costs, timelines, and risks. These needs frame our communication and timely advice assists our clients in making informed decisions. We use state-of-the-practice tools, equipment that minimizes costs and disruption at operating facilities, automated database tools for fast and accurate reporting, and work products that clearly depict the data with the solution.

SITE ASSESSMENT + EVALUATION

• Environmental Site Assessment

• Fate and Transport Analysis including Natural Attenuation Evaluation Monitoring

• Property Transaction Support

• Remedial Investigation Feasibility Study (RI/FS)

• Vapor Intrusion Assessment and Mitigation

INDUSTRIAL STORMWATER

PROPERTY CLEANUP + REDEVELOPMENT

• Cost Recovery, Allocation, and Mediation Support

• Insurance Claim & Litigation Support

• Regulatory Strategy

• Remedial Design/Engineering

• Turn-Key Remediation

• Construction Bid Support

• Construction Oversight & Monitoring

• NPDES Permitting and Compliance

• Industrial Stormwater Management

• Stormwater Treatment

• Infiltration

• Mixing Zone Studies

• SWPPPs and SPCCs

• Underground Injection Control (UIC) wells

• State Waste Discharge Permits

LANDFILL AND SOLID WASTE

• EIM Data Deliverables for 351 Landfills

• Gas Extraction System Design, Monitoring and Optimization

• Geotechnical Stability and Liner Design

• Groundwater Monitoring and Statistical Analysis

• Hydrogeologic / Site Characterization

• Leachate and Stormwater Control

• New Cell Development

• Permitting/Operation and Maintenance Support

• Redevelopment of Closed Landfills

• Regulatory Compliance (173-304 & -351)

• Toxic Air Pollutants and Greenhouse Gas Emissions Evaluations

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Sea-Tac Airport International Arrivals Facility PCB Remediation

With traffic growing by 41 percent over the last five years, Sea-Tac Airport is now the ninth busiest airport in the US. To meet its goal of increasing the number of international flights and destinations over the next 25 years, the Port of Seattle is building a new, 450,000 square-foot expanded International Arrivals Facility (IAF). This new facility will nearly double the international capable gates—increasing passenger capacity, increasing size and number of bag claim carousels, and ultimately reducing passenger connection time. During construction of the IAF, polychlorinated biphenyl (PCB)-contaminated soils were encountered at a former airline hangar maintenance building. This discovery initiated a remediation project within an active and congested construction site.

THE PROBLEM:

HOW WE HELPED:

Aspect and our teaming partner, DH Environmental, conducted environmental investigations and remediation in accordance with Toxic Substances Control Act PCB regulations. The Port used Aspect’s expertise in source identification and extent delineation, developing a conceptual site model, managing cleanup of PCB-contaminated soils, and navigating regulatory oversight by EPA and Ecology. Aspect also responded quickly to vapor intrusion concerns by evaluating vapor intrusion risk and designing a vapor barrier solution for potentially affected portions of the IAF. Groundwater downgradient from the source area was also evaluated to ensure the contaminants were not migrating via a groundwater pathway.

MILESTONES FOR THE PORT

No interruptions to the construction schedule or public usage occurred during the investigation and remediation activities. The IAF is on target to open in the last quarter of 2020 and welcome international travelers to the Seattle region.