Testing the water temperature should be at the water supply as close to introduction to the grout plant as feasible (directly with a thermometer, or with a probe at the end of wire (thermocouple) if it is within a tank that cannot be reached by hand). For example, if the water is coming from a tank on a truck into an intermediate container (such as a 200-gal plastic tank or trough) near the grout plant before dosing, the intermediate container would be the best place. If using ice, it may also be beneficial to get several temperature readings including the water source before cooling, to help in planning of future operations.