Regulations Governing Certification by Professional Environmental Engineers Article 11

Environmental engineers shall bear responsibility for maintaining the confidentiality and adequate custody of worksheets, and shall preserve worksheets for five years after the date of report submission.For the foregoing worksheets, the entrusting party may request to read, transcribe, or produce photocopies, and the entrusted environmental engineer shall not refuse.
中文原文 環境工程技師簽證規則第11條
環工技師對於工作底稿應盡保密及妥善保管之責任,並應自提出簽證報告之日起,保存五年。
前項工作底稿,委託人得要求閱覽、抄錄或影印,環工技師不得拒絕。

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