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Melissa Armstrong, P.E.

Melissa Armstrong, P.E.
Senior Consultant

Melissa Armstrong, P.E.

Senior Consultant

Ms. Melissa Armstrong specializes in groundwater remediation, fate and transport of contaminants, and management of environmental remediation sites. She has worked on a wide range of challenging environmental remediation sites and litigation cases.

Ms. Armstrong has more than 15 years of environmental experience, including conceptual site model development, remedial design and planning, and management of a variety of large site investigations for various contaminants of concern including per- and polyfluoroalkyl substances (PFAS). Her project management experience includes organizing and writing reports, project planning, cost estimating, preparing proposals, and managing large pro...

Ms. Melissa Armstrong specializes in groundwater remediation, fate and transport of contaminants, and management of environmental remediation sites. She has worked on a wide range of challenging environmental remediation sites and litigation cases.

Ms. Armstrong has more than 15 years of environmental experience, including conceptual site model development, remedial design and planning, and management of a variety of large site investigations for various contaminants of concern including per- and polyfluoroalkyl substances (PFAS). Her project management experience includes organizing and writing reports, project planning, cost estimating, preparing proposals, and managing large project teams. In addition, Ms. Armstrong has extensive experience as a supporting technical expert in a variety of litigation cases, including construction defect cases and environmental contaminant fate and transport cases.

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Colorado’s Current & Future PFAS Regulation in a National Context: Logan Uselman to Present at CEMS Conference

Press Release

September 09 2021

PFAS: Melissa Armstrong’s Poster on Sampling Methods at RemTEC Summit

Press Release

March 08 2021

PFAS

PFAS Investigation at Industrial Facility, Confidential Site, Northeastern U.S. Project manager and expert support for a confidential industrial facility over the course of multiple years and multiple lawsuits.  Work included evaluating additional sources for PFAS and 1,4-dioxane through public data mining as well as planning field investigations to collect new data. Also responsible for reviewing and managing case documents, and conducting fate and transport and forensic analysis.
PFAS Evaluations, Confidential Locations, Nationwide Project manager and expert support for the evaluation of claims regarding the occurrence and mitigation of PFAS in soil and groundwater including potable groundwater supplies. Support included treatment design and cost estimating, fate and transport evaluation, and drafting expert reports.
PFAS Investigation and Monitoring, Confidential Site, Denver, Colorado Lead the development of an investigation and long-term monitoring program for PFAS in a large aquifer that served as water supply to nearly 50,000 people. Developed no-purge PFAS sampling methods to minimize cross contamination and save the client time.

Litigation Support

PFAS Investigation at Industrial Facility, Confidential Site, Northeastern U.S. Project manager and expert support for a confidential industrial facility over the course of multiple years and multiple lawsuits.  Work included evaluating additional sources for PFAS and 1,4-dioxane through public data mining as well as planning field investigations to collect new data. Also responsible for reviewing and managing case documents, and conducting fate and transport and forensic analysis.
Litigation and Expert Witness Support, Multiple Complaints, Nationwide Expert support for the evaluation of claims regarding the occurrence and mitigation of PFAS in soil and groundwater, including potable groundwater supplies. Support included treatment design and cost estimating, fate and transport evaluation, and drafting expert reports.
Grand Ditch, Rocky Mountain National Park, Colorado Project manager for litigation matter involving a breach in a ditch in Rocky Mountain National Park. Completed Hydrologic Engineering Center-River Analysis System (HEC-RAS) sediment and surface water modeling as well as background research and document review to support the client at mediation. Results were summarized visually in a slide presentation.
1,4-Dioxane Litigation Support, New York Project manager and lead technical support for a litigation project where 1,4-dioxane has impacted a regional aquifer. In the initial stages of the project, responsibilities included managing staff to find and organize publicly available information as well as reviewing documents provided by counsel to extract relevant information. Responsible for all document control and organization, including communicating with counsel regarding document requests and numerous follow-ups to obtain important documents from the plaintiffs.  Responsibilities in the final stages of the project included leading a team of four technical staff to develop multiple lines of evidence in preparation for settlement, including numerical solutions and GIS analysis to identify and allocate responsibility for source mass.
Construction Defect Claim, Erie, Colorado Served as lead technical support for this large construction defect case where an entire development had structural damage due to swelling soils. Oversaw drilling of several monitoring wells, managed all well sampling and aquifer testing and completed the data analysis for the project. In addition, was responsible for reviewing and cataloging all case documents and oversaw the production of the expert report, including managing staff to create tables and figures, drafting text, and working with the testifying expert to finalize the report.

Project Management

Former Chemical Distribution Facility, Ashland, Minnesota Project manager for this site impacted with light nonaqueous-phase liquid (LNAPL) including chlorinated volatile organic compounds and petroleum products. Integral designed and implemented SVE for vadose zone soils, bioremediation injections for shallow groundwater, groundwater extraction for deeper groundwater, and LNAPL recovery.  Managed teams, both internal and external to draft several documents simultaneously as well as various field efforts. Field efforts included shallow soil delineation and excavation, vapor mitigation, and groundwater investigations. Site includes complex stakeholder relations.
Chemical Storage Facility, Denver, Colorado Assisted the project manager in estimating and managing the budget, including drafting proposals for the client. In addition, managed technical tasks, including planning and implementing a cone penetrometer/membrane interface probe (CPT/MIP) investigation, groundwater monitoring, and reporting.
Bulk Fuel Terminal Tracer Study, Doraville, Georgia Designed and implemented a tracer study using fluorescein dye to characterize liquid-phase petroleum migration in the subsurface. The study included injecting 6,000 gallons of fluorescein dye into four previously completed wells. Dye and nonaqueous-phase liquid (NAPL) distribution were then characterized using laser induced fluorescence in-line with CPT. Responsible for all aspects of the project, including estimating the cost, creating the work plan, and managing subcontractors and staff.  Worked with a team to develop a health and safety plan to ensure the work was executed to both the client’s and the company’s health and safety standards and requirements.

Site Investigation

Municipal Service Center, Westminster, Colorado Project manager for a Westminster Municipal Service Center project for 3 years. Held key roles in the initial conceptual site model development, planning and implementation of a natural source zone depletion investigation, and planning of the long-term strategy for the site. Also responsible for preparing all technical reports, planning and implementing fieldwork, and interacting with client.
Former Freeze-Drying Facility, San Leandro, California Assisted the project manager in all aspects of this guaranteed outcome project, where enhanced reductive dechlorination (ERD) had been implemented for more than 10 years. Responsibilities included interfacing between the project management team and the technical experts within the company. As the “owner” of the conceptual site model, served as the point person for all site data and led biweekly calls to keep the project team informed of new data collected and project progress. Led several CPT and MIP investigations as well as three phases of more than 100 well installations. Also planned and implemented two separate tracer tests to estimate groundwater velocity and aid in the design of the injection system. Responsible for drafting work plans, creating cost estimates, and managing staff to ensure work was performed safely and in accordance with the work plan. Investigation data were used to continually update the conceptual site model and create a 3-dimensional model of hydrostratigraphy using environmental visualization software. The conceptual site model and interpretation of hydrostratigraphy were used to optimize the ERD remedy.
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