Which of the following statements is true about the liquid limit testing procedure?

The statement about the liquid limit testing procedure indicating that the test is run until three determinations are made is indeed accurate. In liquid limit testing, it is standard practice to perform multiple test runs to ensure reproducibility and reliability of the results. The test involves measuring the moisture content at which a soil changes from a plastic state to a liquid state, typically using a standardized device.

By obtaining three consistent determinations of the liquid limit, technicians can verify the accuracy and repeatability of the test results. This practice helps account for any variability in the soil samples being tested, thus ensuring that the reported liquid limit is a reliable characterization of the soil's behavior.

The moisture content of the soil or material may vary freely and isn't confined strictly to intervals that's covered by other choices, which is why statements indicating no specific moisture content or a range between 0 and 100% do not accurately reflect the testing procedure. Furthermore, although multiple tests can be simplified into one in informal assessments, adhering to multiple determinations is essential in a formal testing environment to meet the rigorous quality control standards in aggregate base testing.