Minn. R. 4720.4600
RECORDS
The hauler shall retain a written log for each tank and shall record therein: A. the date when the tank is sanitized; B. the date on which the tank is filled and the name of the approved source from which the water is obtained; C. the chlorine residual and date on which it is measured; D. date on which water samples are sent for analysis; and E. customer's name, address, date, and quantity delivered.