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Triad

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Experienced Practitioner of EPA’s Triad Approach Providing Systematic Planning, Dynamic Work Strategies, and Real-time Data Measurement Development of Accurate Conceptual Site Models and End Point Strategies Data Quality Control and Decision Uncertainty Management TN&A is a practitioner of the EPA’s Triad Approach to achieve cost-effective hazardous waste site characterization and remediation. The Triad is an integrated set of principals and practices based on advances in science, technology, and practitioner experience (USEPA, 2005). The Triad refers to three primary components, systematic planning, dynamic work strategies, and real-time measurement systems. More information about the EPA’s Triad approach is available at (www.triadcentral.org). Triad Project Experience

TN&A has planned and implemented both large and small Triad Approach project. At the Nascolite Superfund site in New Jersey, TN&A overcame an unexpected 400% scope increase when additional contaminated soils and 9 unidentified USTs were found during the course of a remedial action implementation. By using the Triad Approach, TN&A met all project milestones under a strict USEPA-mandated schedule and provided an estimated $1 million in cost savings over a traditional stop-and-start approach.

TN&A worked closely with U.S. Corps of Engineers (USACE) and EPA Region 2 to identify decision parameters for each contaminant, revise the remedial strategy, and create/update a dynamic work plan, which facilitated real-time decision-making in the field. The dynamic work plan included decision-logic for using field analytical results (XRF and PID) to determine soil excavation boundaries. Cleanup of site soils was completed and a no-further-action letter issued by the EPA for that media.

The Pemaco site, a former chemical manufacturer, is located in Maywood, Los Angeles County, California. This highly successful Triad Approach project is led by EPA Region 9 and USACE-Omaha District. TN&A has worked as a team with the EPA and USACE to drive this Superfund project forward on an accelerated schedule of remedial investigation, feasibility study, remedy selection, issuance of the Record of Decision (ROD), and remedial action design. TN&A has used innovative approaches, including the USACE Site Characterization and Analysis Penetrometer System (SCAPS) rig with direct sampling ion trap mass spectrometer (DSITMS), to delineate a solvent plume in complex layered geology. The continuously evolving Pemaco Conceptual Site Model (CSM) serves as the basis for all site decisions including, now, implementation of the remedy. The ROD is inherently flexible so that a broad range of remedial technologies (Electrical Resistance Heating, vapor extraction, pump and treat, and others) can be engaged as needed during the course of cleanup. A multidisciplinary project team, including TN&A scientists and engineers, will actively monitor remedial system performance using web-based reporting. The Pemaco site has been selected by the USEPA as a national Triad Approach demonstration project, as well as a SITE technology demonstration project.