The Organization Act of the Toxic and Chemical Substances Bureau, Environmental Protection Administration, Executive Yuan Article 3

The Bureau shall have one director-general of the rank equivalent to senior grade 13,or the rank of senior grade 12 to 13, and one deputy director-general of the rank of senior grade 12.
中文原文 行政院環境保護署毒物及化學物質局組織法第3條
本局置局長一人,職務比照簡任第十三職等或列簡任第十二職等至第十三職等;副局長一人,職務列簡任第十二職等。

English translation for reference only; the Chinese text prevails. Not legal advice.