Direct/delayed response project: Field operations and quality-assurance report for additional watershed mapping in the northeastern region of the United States

The report documents the second (additional) mapping program of the Direct/Delayed Response Project (DDRP) in the Northeastern United States. The survey of additional watersheds was conducted because of apparent sulfate retention by some watersheds based on data from the original DDRP Northeastern survey. The objectives of the report are to document the methods, field operations, and quality assurance/quality control (QA/QC) of the mapping. The protocols, QA plan, and soil legend for the watershed mapping are presented as appendices.