EPA warns study cannot by itself identify specific PCB sources; further sampling would be needed
Presenter said randomized, coarse site selection and emphasis on surface sediment mean the study will characterize distribution and composition but is not designed to attribute contamination to specific sources; Hill said follow‑up targeted sampling and additional funding would be necessary for source attribution.
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Hill emphasized the study’s limitations: the randomized and relatively coarse site selection and the focus on surface sediment and recent inputs mean the work will underrepresent sources that are no longer actively cycling or provide definitive point‑source fingerprinting without additional targeted sampling.
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