Final answer:
A technician must keep records of evacuating refrigerant from appliances with a full charge of more than 5 lbs. and less than 50 lbs. for three years, including details about the event to comply with environmental regulations.
Step-by-step explanation:
A technician who is evacuating refrigerant from appliances with a full charge of more than 5 lbs. and less than 50 lbs. that are being disposed of is required to keep records of the event for three years. These records must include the date of recovery, the quantity of refrigerant recovered, the type of refrigerant, and the make, model, and serial number of the equipment from which the refrigerant was recovered. Failure to properly maintain these records can result in significant fines and legal penalties as it is necessary to comply with environmental regulations concerning refrigerant gases, which can be ozone-depleting or potent greenhouse gases.