US lawWashingtonRegulationsTitle 173 — ECOLOGY, DEPARTMENT OFChapter 173-410 — SULFITE PULPING MILLS173-410-100WAC 173-410-100WAC 173-410-100. Special studiesLast amended: 1991Year: 2026Length: 19 wordsOfficial source Ecology may require such additional special studies relevant to process emissions and establish completion dates as it finds necessary.PreviousWAC 173-410-087