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PFAS Assessment and RemediationTetra Tech leverages our best-in-class environmental management resources and Leading with Science® approach to provide cutting-edge consulting and engineering services for emerging contaminants. Over the course of more than 50 years, Tetra Tech has built a strong reputation for our site investigation and remediation practice using a science-based approach to technical excellence and project execution. Our engineers and scientists place an emphasis on optimizing treatment processes, minimizing operations and maintenance requirements, and implementing adaptive design methods to reduce overall life cycle costs.The PFAS landscape is continuously changing. Fortunately, Tetra Tech is at the forefront of this issue, bringing nearly two decades of relevant experience and qualications. Tetra Tech is conducting PFAS investigations at over 50 facilities, including work for the US DoD, Australian DoD, and several municipal and commercial clients across the globe. As PFAS regulations evolve, we understand the sensitive nature of PFAS investigation, particularly in areas where PFAS have impacted the surrounding community. Our PFAS assessment services include traditional remedial investigations with human health and ecological risk assessment as well as multi-source identication, large programmatic residential well sampling, and community outreach programs. PFAS interactions with various environmental media are just beginning to be studied. PFAS represent a unique challenge and behave dierently in the environment than other regulated compounds. Tetra Tech has responded to this challenge by mobilizing our experts in groundwater modeling, articial intelligence, and machine learning. As we gather data at more and more diverse sites, we test and rene our models of PFAS fate and transport.Tetra Tech is a leader in the development andoptimization of PFAS remediation technologies. We continue to leverage our Emerging Contaminants Technology Development Program to forge valued partnerships with universities and research facilities, allowing Tetra Tech to be on the cutting edge of PFAS removal and destruction research and application. Our experience ranges from demonstration testing to full scale remediation using a variety of conventional and new technologies developed to address these “persistent contaminants”, including:• Granular Activated Carbon• Powdered/Colloidal Activated Carbon• Single Use and Regenerable Ion Exchange Resin• Plasma• Electron Beam• Sonolysis• Super Critical Water Oxidation • In Situ Flushing• Foam FractionationFate and TransportDemonstration, Remediation and Full-Scale TreatmentInvestigation and Risk Assessment

Case StudiesTetra Tech has over 50 years’ experience conducting site investigations and remediation for a broad range of contaminants. PFAS, an emerging contaminant with many unique properties, requires an experienced contractor with a strong environmental foundation and the ability to innovate. The highlighted case studies illustrate non-routine site characterization and innovative treatment solutions for PFAS.Treatment of PFAS from Storm Water BasinTetra Tech designed and constructed a 50 gallons per minute (gpm) PFAS treatment system to address PFAS-contaminated water that accumulates in the tank berms from precipitation. Tetra Tech conducted treatability studies to determine the eicacy of removal of PFAS associated with colloidal particles. The innovative, state of the art mobile treatment system is operating in a renery combustion safety zone setting and successfully treating a complex mix of petroleum and PFAS constituents.PFAS Treatment in Seeps & StreamsTetra Tech has completed several tasks to mitigate migration of PFAS o-site via surface water. At one outfall, Tetra Tech designed, constructed, installed, and operated a one gallon per minute SeepSorberTM system to remove high concentrations of PFAS in seep water. The seep water ows through a treatment system containing PFAS adsorbents. The system is currently operating and has reduced PFAS concentrations in the eluent seep water by more than 99.99%. Destruction of PFAS in Soil/Sediments using Electron Beam TechnologyTetra Tech has been collaborating with Texas A&M University on the research, development, and commercialization of Electron Beam (eBeam) technology for the destruction of PFAS in soil, sediments, biosolids, leachate, and high concentration liquids. The development of a eld deployable system is underway with support from SERDP-ESTCP and other entities.PFAS Treatability/ Pilot Tests Tetra Tech has designed, constructed, and operated a multi-column treatability/pilot testing system for the treatment of PFAS from two waste streams. The treatability tests were conducted in response to PFAS concentrations detected in the eluent from the WWTP and the FFTA groundwater. The treatability/pilot testing system consisted of four parallel treatment trains to compare four dierent treatment media for PFAS removal. The results indicated successful removal of multiple PFAS with dierent breakthrough bed volumes for each PFAS compound.0102040503Biota Sampling for PFAS Risk AssessmentsTetra Tech collected shellsh (clams, mussels) and n sh (brook trout, black crappie) for PFAS analysis in tissue to support human health and ecological risk assessments at a DoD site. The sample design included co-located sediment and shellsh samples to assess PFAS uptake. Samplers followed Tetra Tech-developed SOPs to avoid cross contamination of these ubiquitous chemicals. EPA’s Method 1633 was used for tissue analysis of up to 40 PFAS.

PFAS Experience WorldwideContact UsPurshotam Juriasingani, PE, CEMVice President, Technology Development & Remediation-Emerging Contaminants512.338.2853Purshotam.juriasingani@tetratech.comRick Arnseth, PhD, PG, PMP Project Manager/Geochemist865.220.4721Rick.arnseth@tetratech.comPFAS Related Investigation Services under CERCLA at 54 Navy Installations Nationwide; IDW Treatment Systems; EE/CA; Design & Implementation; Community EngagementPFAS Sampling Technical Support, Emergency Response, Remedial Activities, Sonolysis Treatment R&D PFAS Related Site and Drinking Water Investigations, Alternative Water Supplies, Product Removal and Regulatory Advice; EE/CA; Design & ImplementationPFAS Investigations at 16 Facilities; Potable Water, Wastewater & IDW Treatment Systems; In Situ Seep/Stream Treatment; Treatability StudiesAFFF Products Removal & Replacement, PFAS Related Investigation and Monitoring Programs, Pilot and Full-Scale Design, Remediation Testing, and Treatment System InstallationPFAS Related Investigations, Remedial Design and Implementation, Technical Advisor$110MNAVY$27MNASA$27MUSEPA / DoD (RD&T)$20MCommercial/ Municipal$30MARMY/ AIR FORCE$19MAus DoD