挖掘作业可能损坏地下管道或公用设施。

Also when digging operations have potential to strike underground pipelines or utilities.

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第十三条洁净室(区)内各种管道、灯具、风口以及其他公用设施，在设计和安装时应考虑使用中避免出现不易清洁的部位。

Article 13: the various pipes, light fixtures, ventilation points and other public facilities in the clean room (area) shall be designed and installed so as to avoid areas being difficult to clean.

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