How do you check rock excavation competency in Borama?

Rock excavation competency risks are best checked before award, with records, a supervised test cut and a named machine. Claims about past jobs tell you little. Ask for the method statement, the plant list and the daily logs that back them. A contractor that has broken rock on a nearby plot can show what was used and who supervised it.

What does an unverified rock excavation claim hide?

A claim hides the gap between what the contractor says it has done and what its own paperwork shows. A bid may name a hydraulic breaker but list no compressor, no breaker and no operator with that machine in the plant schedule. The crew on site then has to open the trench by other means, and the work slows or stops. The cost of that shortfall lands on the client through variations or idle time.

Ask for the method statement for each rock class, the plant list with model numbers, the operator records and the daily logs from the last similar job. Ask whether the contractor owns or hires the breaker and what the hire agreement allows. Confirm the specification with the project engineer before you compare bids, because the rock class and the line between excavation and rock removal change the scope.

How do plant records and a test cut show real capability?

Records show capability, and a supervised test cut confirms it on your ground. Ask the contractor to open a short length of trench at the hardest point on the plot, with the machine and operator it has named in the bid. Watch how the breaker is sized to the rock, how the spoil is handled and whether the crew can trim the trench to line and level.

Keep the same supervision on that cut as on the main works. A test cut also gives you a rate to compare against the bill of quantities. In hard ground the machine cost per hour can sit well above the labour rate, so an unverified bid that prices only labour often returns as a variation. Ask two suppliers for written hire rates for the plant the contractor names, and compare those rates with the plant section of the bid.

Where does the risk hit the programme and the budget?

It hits when the machine is not on site when the excavation starts. A breaker that has to be hired in from another town, or an operator who has never run that model, adds idle days. The programme slips, the client pays for standing plant or a second mobilisation, and later trades queue behind the excavation.

Follow the same rule for every bid you compare. Ask for a written programme that names the plant and the dates it will be on site. Check what your contract allows when the plant arrives late or the rock class changes, and take advice before you change the scope or the rate. Ask the municipal engineer's office whether it holds site records for the plot or area. A recent site nearby, walked with the supervisor and the contractor, shows more than a reference letter.

What to do next

Ask every bidder for the method statement, plant list, operator records and daily logs from one similar rock excavation. Then arrange one supervised test cut at the hardest point on the plot, with the named machine and operator, and log the hours. Award the work only when the records, the test cut and the written programme match.