The inquiry also revealed that overloading of tankers was common practice at Enpetrol refineries. The Tarragona facility lacked either a meter to measure the amount of gas dispensed or an automatic shut-off device to prevent overfilling, and consequently most tanks were consistently overloaded. The driver was neither informed of the overloading, nor about the type and class of the cargo, and there was no means for him to check the pressure level of the tank before he departed or to monitor it in transit. He had not attended the hazmat training program for drivers of dangerous goods, because the company considered his experience of twenty years as a truck driver to be sufficient. The inquiry also determined that, between 3 January and 7 July that year, 32 tanks left the Tarragona refinery overloaded, with drivers other than Imbernón.