The Department may, at any time without announcement, measure the back pressure during the loading of tank trucks at the loading rack or the emissions (as percent LEL) from a tank truck using a combustible gas detector to determine the compliance of the tank trucks with the requirements set forth above. The leak tightness of a tank truck shall be measured by use of a gasoline leak detection technique which uses a combustible gas detector or by use of such other means as approved by the Department.
06- 096 C.M.R. ch. 120, § 7