Chapter 6: Local Road Construction Management 153 quality control program. ii. Check inventory of the site laboratory against the equipment required by the Contractor in order to carry out all the tests required to meet Specification compliance, and also its calibration; iii. Instruct and supervise the Contractor’s materials engineer and laboratory staff.; iv. Visit the sources of materials supply and manufacturing plants proposed by the contractor to check if they can provide materials of the required quality, quantity and rates of delivery throughout the estimated period of construction; v. Oversee initial and subsequent periodic tests on all construction materials; i.e., aggregates, cement, reinforced steel, bitumen, base materials etc. to confirm that they comply with the Specifications; vi. Immediately notify the Contractor, the Resident Engineer and the Engineer’s Representative of any materials, which have failed or are considered likely to fail to comply with the Specifications. A decision will then be made by the Engineer as to whether the suspect material is to be replaced; vii. Select and oversee test on concrete mixes, which the Contractor proposes to use including Job Mix Formulae. Subject to these being satisfactory, submit details to the Engineer’s Representative with recommendations for approval; viii. Carry out initials and periodic checks of all concrete batching, mixing and transporting equipment including calibration; ix. Select and mark, in accordance with the Specification, concrete test specimens and subsequently witness all site tests carried out on them; x. Compile and maintain comprehensive records of all concrete placed; xi. Advice the Engineer’s Representative on approval of admixtures, curing agents etc; xii. In conjunction with the Contractor and Project Inspector, establish, where required by the Specifications, the in-situ properties of ground beneath existing pavement layers; xiii. In conjunction with the Contractor and the Engineer’s Representative and site supervision staff, i.e. labor foreman/ inspectors, establish in laboratory trials the properties of soil being used in road base construction, backfilling, etc;