2 sentences for 开挖 (kāi​wā — start digging)

1. 该运河工程预计将于下周正式开挖。

   gāi yùn​hé gōng​chéng yù​jì jiāng yú xià zhōu zhèng​shì kāi​wā.

   Excavation for the canal project is expected to begin next week.

   Source: Dong Chinese Dictionary

2. 在开挖地面之前，必须先核实地下管线的位置。

   zài kāi​wā dì​miàn zhī​qián, bì​xū xiān hé​shí dì​xià guǎn​xiàn de wèi​zhi.

   Before excavating the ground, the location of underground pipelines must be verified.

   Source: Dong Chinese Dictionary