Question 1

What is hydro excavation and why is it used?

Accepted Answer

Hydro excavation uses high-pressure water jets to break up soil, which is then extracted by vacuum into onboard tanks. It's used because it avoids direct contact with buried services, reducing utility-strike risk by up to 90 percent compared to mechanical digging. This method is particularly valuable in Caves Beach where multiple utilities converge in narrow verges.

Question 2

How does Excom Civil locate underground services?

Accepted Answer

Excom Civil uses electromagnetic locating to identify underground cables and metallic pipes, and ground-penetrating radar to detect non-metallic conduits. Current underground asset plans are obtained through Before You Dig Australia as a baseline. Potholing with hydro excavation then confirms actual locations and depths before mechanical trenching begins.

Question 3

What is site dewatering and when is it needed?

Accepted Answer

Site dewatering removes water from excavations using sumps, wellpoint systems and clean water pumps, managed within NSW Water Management Act requirements. It's particularly important on low-lying coastal sites where groundwater sits only metres below the surface and heavy rain can rapidly flood trenches.

Question 4

Does Excom Civil handle drain and sewer cleaning?

Accepted Answer

Yes, Excom Civil uses high-pressure water jetting and vacuum units to clear stormwater and sewer lines. Services include pit cleaning, silt removal, culvert maintenance, sewer main cleaning and gross pollutant trap servicing. This proactive maintenance helps limit blockages and overflows that could reach creeks or beaches.

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FAQ Title

What is hydro excavation and why is it used?

How does Excom Civil locate underground services?

What is site dewatering and when is it needed?

Does Excom Civil handle drain and sewer cleaning?

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