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Associated Earth Sciences, Inc. (AESI) engineers, hydrogeologists, and geologists have the expertise necessary to offer cost-effective solutions for our clients’ environmental needs. AESI’s staff are well versed in site characterization, current state and federal regulations, cleanup strategies, and remediation technologies.
We offer cost-effective environmental solutions to meet both project timelines and budgets with services ranging from due diligence to remediation and site closure.
AESI’s expertise provides our clients with practical environmental solutions that are focused on achieving regulatory closure.

AESI provides environmental services for a diverse client base, including real estate developers, attorneys, industrial and commercial facilities, educational facilities, and petroleum storage facilities.

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Site Assessment

  • Phase I Environmental Site Assessment

  • Phase II Environmental Site Assessment

  • Remedial Investigations/Feasibility Study (RI/FS)

  • Ground Water Monitoring Well Installation

  • Soil and Ground Water Sampling

  • Underground Storage Tanks (UST) Assessment

  • Asbestos and Lead Paint


Analysis, Assistance, and Compliance

  • Model Toxics Control Act (MTCA)

  • Department of Ecology Voluntary Cleanup Program (VCP) 

  • NPDES Permitting

  • Negotiations with Regulatory Agencies

  • Spill Prevention, Control and Countermeasure Plans (SPCC

Remediation Services

  • Development and Evaluation of Remedial Alternatives

  • Remedial Design and Cost Estimates

  • Preparation of Construction Bid Documents

  • Waste Characterization and Disposal

  • Construction Monitoring

  • Underground Storage Tanks (UST) Decommissioning

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Soil Characterization, Model Remedy Evaluation, and Soil Management Planning for School, Commercial and Industrial Properties in the Tacoma Smelter Plume

For almost 100 years, the American Smelting and Refining Company (ASARCO) operated a copper smelter in Tacoma. Air pollution from the smelter settled on the surface soil of more than 1,000 square miles of the Puget Sound basin. In addition, fill comprised of pulverized reverberator slag is also prevalent throughout the Tacoma area. Arsenic, lead, and other heavy metals are still in the soil as a result of this pollution.

AESI has extensive experience serving commercial and industrial properties and other non-residential (e.g., school districts) properties subject to the Washington State Department of Ecology’s (Ecology) Tacoma Smelter Plume Model Remedy Guidance because of high arsenic and lead levels in soil.

Properties within the Tacoma Smelter Plume require precise, geospatial soil sampling to establish the need for remediation using one of the four model remedies established by Ecology, in depth knowledge of the applicability of the four model remedies to a variety of geologic settings, an ability to add statistical analysis to the linear interpolation method required in the Tacoma Smelter Plume Model Remedy Guidance.

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The concentration of arsenic and lead from the former ASARCO plant varies in the Tacoma area

AESI services include:

  • Characterization Sampling

    • Creation of a geospatial sampling grid of the property using the linear interpolative method

    • Soil sampling

    • Analysis of laboratory results

    • Report for client with recommendation for remediation or no action

    • Consultation with Ecology

  • Soil Management Plan / Cleanup Action Plan

    • Evaluation of the model remedies in the context of the specific property and client plans

    • Remediation Recommendations

    • Assistance in soil management, compliance and stockpile sampling during construction

    • Consultation with Ecology

    • Preparation of reports for the client for submission to Ecology

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