{
  "display_rule": "registered derived rationals: three decimals, nearest, half away from zero; do not infer source accuracy from display",
  "exact_numeric_encoding": "reduced rational strings where applicable; source indices/counts are not rounded before comparison",
  "limitations": [
    "Archive-returned site IDs, not proof of every historically designated site",
    "Annual labels are not instantaneous water quality or swimming safety",
    "No classification in 2020; adjacent-year comparisons do not bridge it",
    "Multi-year sampling windows overlap; historical pairs are not independent trials",
    "2021-2023 used four sample years drawn from five calendar years",
    "No prediction or current-safety recommendation",
    "Closed/non-ranked and missing records excluded explicitly"
  ],
  "method_version": "bathing-experimental-1",
  "source_row_references": "line numbers include header; H6 workbook cell/date lineage in complete result",
  "source_units": "published annual classification labels"
}