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EXH AR023559: Letter Water Resources Consulting (Peter Willing PhD) re SEPA DNS Sea-Tac Aircraft Hydrant Fueling System

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In a October 2000 letter to the Port of Seattle, Water Resources Consulting LLC — writing on behalf of the Airport Communities Coalition — raised concerns about the SeaTac Aircraft Hydrant Fueling System project, arguing that construction should be delayed until an ongoing groundwater contamination study under the Model Toxics Control Act was completed. The letter criticized the project's environmental review (Declaration of Nonsignificance) for lacking specific details about leak detection, operating pressures, and contaminated soil management. The consultant warned that deep utility trenching could create preferential flow paths for existing fuel contaminant plumes, potentially threatening the groundwater supplies relied upon by nearby communities.

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Letter dated October 20, 2000 from Peter Willing, Ph.D. of Water Resources Consulting LLC, on behalf of the Airport Communities Coalition (ACC), to David McCraney of Port Of Seattle regarding the SEPA Declaration of Nonsignificance (DNS) for the SeaTac Aircraft Hydrant Fueling System. Raises concerns about: (1) coordination between the new fuel hydrant construction project and the ongoing MTCA (Model Toxics Control Act) Agreed Order hydrology study; (2) inadequacy of the DNS regarding leak detection system specifications, operating pressures, and pressure transients; (3) risk that utility trenches and gravel backfill will create preferential flow paths for existing TPH contaminant plumes in perched aquifers; (4) contaminated soil from UAL, Continental, Delta, NW, and Pan Am fuel systems encountered during construction. Requests the Port delay construction until the MTCA Agreed Order hydrology study is complete and issue a supplemental environmental analysis. AR 023559–023561.

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