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Andrew J. Halmstad, P.E.

Andrew J. Halmstad, P.E.
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Andrew J. Halmstad, P.E.
Senior Consultant

Andrew J. Halmstad, P.E.

Senior Consultant (503) 505-0114 Portland, OR ahalmstad@integral-corp.com

Mr. Andrew Halmstad is an engineer with 7 years of consulting experience focusing on environmental remediation and cost allocation of contaminated sediments, groundwater, and soils.  His specific skills include reviewing and summarizing results of ongoing environmental investigations, supporting source control and remedial design activities, and data analysis for site characterization and remedial activities.  Mr. Halmstad has supported and led numerous field operations, including site investigations, in situ remedial treatment application, aquifer testing, remediation system operations maintenance and monitoring, and sampling of soil, groundwater, and stormwater.  He also has experience planning, managing, and conducting environmental investigations; analyzing remedial alternatives; conducting feasibility studies; and providing oversight of remedial measures.

Emerging Contaminants in Stormwater: Webinar

Video

February 07 2024

Integral Presents on Bioremediation, PFAS, Vapor Intrusion, and 3D Modeling at AEHS Conference

Press Release

March 18 2021

Riverbank Source Control Measure, Portland Harbor

Case Study

December 15 2023

Sediment Remedial Design at a Multiparty Superfund Site

Case Study

December 15 2023

Settling Natural Resource Damage Responsibilities for Steel Mill Operations

Case Study

December 15 2023

Untangling Superfund Liability for Current and Historical Steel Mill Facilities at the Portland Harbor NPL Site

Case Study

December 15 2023

Stormwater Source Control: Willamette River, Oregon

Case Study

May 23 2019

Remedial Design

Soil and Groundwater Remediation Support at a Chemical Distribution Facility, Santa Ana, California Project manager for multimedia chlorinated solvent remediation project with several active remediation components.  Responsible for leading multiple ongoing project components including oversight of operations and maintenance of a multiphase groundwater treatment program at a chemical distribution facility; data analysis and review in support of ongoing remediation reporting at the facility; and preparation of semiannual groundwater monitoring and remediation reports summarizing periodic sampling and analysis of resulting data.  Recent work included preparation of an agency-approved remedial action plan for accelerated treatment of soil and groundwater to achieve site closure and implementation of initial phases of the plan.
Operations and Maintenance, Engineering, and Technical Support, Steel Mill, Portland, Oregon Supporting the Principal-in-Charge for a multiyear source control and remedial investigation and feasibility study at an active steel mill.  Work includes site characterization, risk management, and implementation of remedial actions to prevent soil, sediment, and stormwater impacted with PCBs and metals from adversely affecting the Portland Harbor Superfund site.  Supported pilot testing–level implementation of a proposed stormwater treatment system including field support, data analysis, and evaluation to support full-scale design and implementation.
Superfund Remediation Process Optimization, La Marque, Texas Supported the lead project engineer with evaluation of an existing groundwater treatment system to develop recommendations for streamlined unit processes.  Supported migration of an aging programmable logic controller system to a modern system.  Developed a robust network setup that allows for controlled local and remote access by multiple users.  Currently supporting the evaluation of enhanced separation of dense nonaqueous-phase liquid for reduced operations and maintenance time/cost.
Former Vapor Cleaners, Monterey, California Project manager for ongoing remediation and monitoring of volatile organic compound (VOC) contamination at a former dry cleaner site.  Provided field oversight of an in situ enhanced bioremediation injection program targeting VOCs in a shallow, sandy, coastal aquifer.
Yosemite Slough Remedial Design, San Francisco, California Provide direct support to the engineer of record for an EPA non-time-critical removal action of lead- and PCB-contaminated sediments at the Yosemite Slough Superfund site.  Project elements include sediment dredging, capping, and natural attenuation.  The design includes multiple proof-of-concept studies, as well as development of plans and specifications for construction.
Former Gasoline Fueling and Service Stations, Oregon Project manager for an ongoing, multisite project involving ongoing remedial activities at former fueling and service stations throughout the state of Oregon.  Project work has involved groundwater monitoring, well decommissioning, and contractor oversight at both current and former fueling stations.

Stormwater Management

Former Chemical Manufacturing Facility, Portland, Oregon Provided technical support in implementation of project plans and specifications for construction of stormwater source control measures, including capping of areas of known contamination, decommissioning of the current site stormwater collection system, and construction of drainage channels, detention basin, and sand filter prior to discharge to the river.  Provided construction oversight, including coordination with contractor, client, and onsite facility personnel.  Currently assisting with monitoring of the implemented stormwater measures to assess performance, optimize treatment efficiencies, and conduct ongoing operations and maintenance activities.  Duties include routine site visits for operations maintenance and management of the existing system, periodic sampling, and data collection.

Sediment Investigation

Source Control and Sediment Cleanup Multiparty Allocation Support, Portland, Oregon Project manager overseeing multiple active tasks and providing technical support related to source control activities and allocation of CERCLA cleanup and natural resource damage costs.  Researched historical records, conveyance system maps, industrial operations, soil and sediment chemistry, and fate and transport.  Researched other nearby properties.  Managed development of memoranda and research tasks, including operational and drainage history, sediment transport modeling, and forensic evaluations.  Compiled and synthesized relevant information to respond to disclosure questionnaires and supplemental information requests.  Evaluated natural resource damage settlement offers relative to sediment chemistry, sources, and operational history, and prepared associated documentation.  Communicated findings to facility staff and attorneys, and participated in a collaborative team with attorneys.
Multiparty Allocation Related Expert Report and Rebuttal Support, San Francisco, California Support the potentially responsible party group in developing a detailed historical understanding of a combined sewer network and its connection to a contaminated slough in San Francisco, ultimately resulting in preparation of an expert report.  Project work involves the review of historical construction schematics and previous environmental site assessments (sediment investigation and contaminant transport, including PCBs), development of a timeline of combined sewer conveyance routes, and mass loading calculations to support a mass balance–based allocation approach.
Mission Bay Ferry Landing Project, San Francisco, California Project manager for design of an engineered cap to address contaminated sediments at a ferry terminal.  Responsible for modeling breakthrough in the cap, engineering, drawings, specifications, costing, and close coordination with the dredging and ferry terminal designers.
Soil Sampling Support at a Former Zinc Smelter Site, Blackwell, Oklahoma Provided field support for drilling and soil sampling activities to characterize subsurface conditions at the site.

Hydrologic Modeling

Permitting and Hydrologic Assessment of an Exploratory Large Open-Pit Gold Mine, Nevada Supported a comprehensive hydrologic assessment of a property in an advanced stage of mineral exploration.  Provided background data research and compilation, logistical planning, and fieldwork assistance for a multistage hydrologic test program.  The results from the hydrologic assessment were used to evaluate project risk and support additional data collection efforts to reduce risk uncertainty.

Regulatory Compliance

Intermodal Container Storage and Repair Facility, Portland, Oregon Ongoing compliance support consisting of monthly stormwater inspections, NPDES reporting assistance, and review of best management practices.

Litigation Support

Litigation and Technical Support for a Chemical Distribution Facility, Santa Ana, California Reviewed reports and provided litigation support including preparation of material to assist with deposition of both plaintiff and defendant experts.  Provided oversight of ongoing operations and maintenance work at the facility.  Provided data analysis and review in support of ongoing remediation reporting at the facility.  Prepared semiannual groundwater monitoring and remediation reports summarizing periodic sampling and analysis of resulting data.

Halmstad, A., M.R. Najafi, and H. Moradkhani.  2013.  Analysis of precipitation extremes with the assessment of regional climate models over the Willamette River Basin, USA.  Hydrol. Process.  27(18):2579–2590.

Halmstad, A., and A. Frankel.  2021.  Post ERD injection site dynamics: Long-term trends at a VOC contaminated site in Monterey, CA. 30th International Conference on Soil, Water, Energy and Air, March 19–22, Virtual Conference.

Halmstad, A.  2018.  Approaching total suspended solids (TSS) treatment.  Platform Presentation.  Northwest Environmental Business Council 2018 Managing Stormwater in Oregon Conference, Salem, OR.  June 21.

Halmstad, A., A. Frankel, D. Moser, T. Wotan, and C. Sandefur.  2018.  Lessons learned from ERD implementation at a CVOC contaminated site in Monterey, CA.  Platform Presentation.  27th International Conference on Soil, Water, Energy and Air, San Diego, CA.  March 19–22.

Halmstad, A., M.R. Najafi, and H. Moradkhani.  2011.  Extreme precipitation variability over the Willamette River Basin as simulated by dynamically downscaled climate scenarios.  2nd Annual Pacific Northwest Climate Science Conference, Seattle, WA.

Halmstad, A., M.R. Najafi, and H. Moradkhani.  2011.  Assessment of climate change impacts over the Willamette River basin using NARCCAP dynamically

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