December 19, 2001August 2, 2026

Guidance for the use of tables: Practical quantitation limits (PQLs), method detection limit (MDLs), and PQL comparisons to Method B cleanup levels

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This document is Part II of a four-part guidance series related to the Model Toxics Control Act (MTCA), explaining how to use tables of Practical Quantitation Limits (PQLs) and Method Detection Limits (MDLs) for cleanup site managers in Washington State. It describes the purpose of PQLs and MDLs, how they compare to MTCA Method B cleanup levels, and provides detailed explanations of the columns and terminology used in the accompanying PQL/MDL tables. The guidance also outlines options available to Ecology when PQLs exceed cleanup levels.

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As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

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