Domonkos Feher - MULTI INCREMENT® Sampling Approach to PCB Release Response Assessment

Version 2

      Publication Details (including relevant citation   information):

      Domonkos Feher, Robert Chong, Joseph Shacat, Tenth   International Conference on Remediation of Chlorinated and   Recalcitrant Compounds, May 22-26 2016, Palm Springs,   CA

      Abstract:

      Background/Objectives. The Grace   Pacific Lower Makakilo Facility is located on the Waianae Range   of Oahu, Hawai'i, at a surface elevation of approximately 120   feet amsl. The property occupies approximately 54 acres and was   formerly used as an aggregate processing facility from the   mid-1970s to 2012, at which point industrial operations were shut   down. Site characterization in the framework of the Hawai'i   Department of Health [DOH] Hazard Evaluation and Emergency   Response [HEER] Office’s Voluntary Response Program [VRP] is   ongoing. During demolition activities associated with the   shutdown in 2012, there was an accidental spill of PCB   contaminated capacitor oil. Subsequent release response   assessment and remediation were conducted by ESI. The objectives   of the release response and remedial actions were to (1) assess   and delineate the extent of PCB contaminated soil, and to (2)   remediate and properly manage and dispose of PCB waste. The   investigation was designed to comply with both, the sampling   strategies promulgated in the Toxic Substances Control Act   [TSCA], and the Technical Guidance Manual [TGM] issued by the DOH   HEER Office. The DOH has been a long-time proponent of more   representative and statistically sound, "incremental" sampling   methods as a means for obtaining reproducible and technically   defensible data and encourages responsible parties to include   these methods into their sampling design whenever possible. Thus,   traditional discrete soil sampling methodology and the   Multi-Increment® Sampling [MIS] approach were used simultaneously   to probe whether the two methods would lead to similar decisions   at comparable costs.
     
      Approach/Activities.   Discrete soil sampling in connection with rapid real-time field   analysis (ELISA) of PCBs and MIS® methodology were explored as   two efficient tools to investigate the extent of PCB   contamination at the spill site (80’x90’). Laboratory data for   MIS® were used for compliance with the DOH HEER Office TGM   guidance. Simultaneously, EPA regulatory requirements were   satisfied by confirmation sampling according to TSCA PCB clean-up   procedures (40 CFR 761). Contaminated soil was removed in a   targeted manner in small portions. To decrease the overall cost   of soil removal and to minimize the need for off-island disposal,   multiple iterations of removal and confirmation sampling   according to both methods (TSCA discrete sampling and MIS®) were   utilized.
     
      Results/Lessons Learned. MIS® methodology provided data required   to delineate the extent of a PCB contaminated capacitor oil spill   and demonstrated that the removal action was sufficiently   protective of human health and the environment. Although sampling   guidance referenced under TSCA (based on discrete sampling) can   provide valuable data to aid with the delineation of the extent   of a PCB spill and the confirmation of complete removal, in the   present case, the MIS® approach resulted in comparable decisions   in a more efficient manner with substantial cost savings and   better, more reliable data than the traditional approach using   discrete sampling.

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