2. Mill Reports: Certified copies of mill re- ports shall accompany all deliveries of reinforcing steel on work utilizing 15 tons or more. i. Mesh Reinforcement: Mesh reinforcement for slabs shall conform to the requirements of American Society for Testing Materials Standard Specification A-185-37, and shall be of sizes shown on the drawings. j. Water: Water shall be clean, fresh and free from oil, acids, alkali, vegetable sewage, organic, or other deleterious matter, Sea water for mixing concrete shall be used only as approved by the Engineer. 5-06, ADMIXTURES: a. Use: training agents, The use of admixtures, including air-en- shall conform to the requirements of the Uniform Building Code. Admixtures shall be used only with the written approval of the Engineer. b. Tests: Tests of admixtures will be made in accorc ance with applicable Federal or American Society for Testing Materials Specifications or as otherwise prescribed by the Engineer. 5-07. SAMPLES AND TESTING: &@. General: All tests will be made by or under the supervision of the Engineer at the expense of the Contractor. All test samples required shall be supplied by the Contracto1z and unless otherwise specified shall be taken under the super vision of the Engineer. No materials shall be used until notice has been given by the Engineer that the test results are satisfactory. b. Cement: Cement shall be tested as prescribed in the applicable referenced specification under which it is ful nished. regates: Aggregates shall be tested as prescribed by the Engineer, employing standard testing procedure as applicable to coral aggregate. Ce d. A Reinforcement: Reinforcement shall be tested as prescribed under the applicable referenced A.S.T.M. Designations under which it is furnished, e. Concrete: One set of three to six cylinders for test purposes shall be taken from each 100 cubic yards or fraction thereof, or each day's pour, whichever is less. Test specimens shall be made in accordance with American Society for Testing Materials Standard Method C 31-44 and 5-5