| Summary: | These data are part of the Gulf Watch Alaska (GWA), Lingering Oil component of the Exxon Valdez Oil Spill Trustee Council, project numbers 12120114-S, 13120114-S, 14120114-S, 15120114-S and, 16120114-S. Gulf Watch Alaska is the long-term integrated monitoring program of the Exxon Valdez Oil Spill Trustee Council (EVOSTC) for the marine ecosystem affected by the 1989 oil spill. The Lingering Oil Surveys dataset was designed to provide the EVOSTC with an assessment of persistent Exxon Valdez oil in Prince William Sound. This dataset is comprised of two related data types: survey and sample data in distinct data tables, which are provided in CSV format; and survey photographs from each sample site. The data tables describe survey locations, sampling sites, chain of custody for samples, gravimetric analysis of oiling at sampling sites, and the method detection limited analyte composition of samples. Surveys were conducted in June of 2015 at nine locations within Prince William Sound. Detailed standard operating procedures of the lingering oil monitoring surveys and petroleum hydrocarbon analysis are included as a pdf files. Survey photos are organized into shore-segment-based collections provided as PDFs files containing all photos from each shore segment. Each collection contains embedded images documenting the survey performed at the shore segment named in the file name (e.g. '2015_SM006B_photos.pdf'). Each page displays one image and provides the file name for the image.
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