Discharge-augmented reach-bracketing reproducibility package: three-campaign PFAS load-space analysis, Trinity River headwaters

Data and code archive for a three-campaign synoptic PFAS study of the West Fork Trinity River headwater network near NAS JRB Fort Worth, Texas. It reproduces, from raw inputs, the complete analysis reported in the accompanying article. The study pairs EPA Method 1633 PFAS measurements from a 15-site reach-bracketing network with exact sample-time USGS discharge, converting a concentration-space analysis into instantaneous load space. Doing so reverses the temporal inference at the gaged downstream node (TW08): ΣPFAS₄₀ concentration fell 10.0% between the two winter campaigns while instantaneous load rose 7.4%, then climbed a further 42.7% into late spring. Network topology and analyte composition independently identify a priority tributary reach (Farmers Branch) and an AFFF-consistent, sulfonate-rich fingerprint reproduced from winter to late spring. Contents. data/raw/ — Eurofins Level 2 laboratory reports, archived USGS 15-minute discharge, site and reach metadata. scripts/ — numbered pipeline: PDF extraction, censoring-aware multiple-imputation analysis over 40 target PFAS, exact sample-time discharge interpolation, load and composition calculations, and figure generation. outputs/ — analysis tables and all figures (vector PDF plus PNG and JPG at 650 dpi). checksums/ — SHA-256 for every file. Reproducing. Extract and run python run_all_reproducible.py. The pipeline regenerates every analysis table and all 12 figure artifacts from the raw inputs; figure rasters are byte-identical across independent runs. Licensing. Data: CC BY 4.0. Code: MIT. USGS discharge records and the USGS Hydrography basemap are U.S. Geological Survey works in the public domain.