§ 4. MEASURING AIR CONTENT.
   The air content shall be measured in accordance with ASTM method of test for air content of freshly mixed concrete by the pressure method (Designation C-231) or ASTM method of test for air content of freshly mixed concrete by the volumetric method (Designation C-173).
(1984 Code, Ch. 157, App. A, § 4) (Ord. O-86-78, passed 8-17-1978)