The work of a concrete construction inspector takes place in three stages: before, during, and after concreting. Stage 1: Inspection before concreting. Soon after the contract is awarded and well before any concrete work in started, inspection personnel should review the contractor's plans for all phases of concrete operations. The requirements and responsibilities for preconstruction qualification of materials, certificates of compliance, mix designs, quality control testing by the contractor and quality assurance testing by the inspection personnel should be reviewed and agreed upon. Meetings should be held to inform inspectors of al the above matters, including decisions and agreements made between the contractor and engineer; correspondence regarding these matters should be made available to the inspectors for review. Only after all items have been signed off is approval given to place concrete. Stage 2: Inspection during construction. Inspection of this phase of the concrete work is usually divided into two parts: concrete production and concrete placing. It is quite helpful to have good communications between the inspectors assigned to these two parts, especially if they are far apart. The inspector at each end can keep the other advised or progress and many problem affecting operations so that prompt action can be taken. Stage 3: Inspection after concreting. The inspector and the contractor's representatives should observe the concrete soon after the forms are removed to determine what repairs might be required. Sometimes this observation indicates deficiencies in the concrete handling and placing procedures which can be corrected in future placements, obviating the need for future repairs. Good repairs are difficult to make and expensive. Cheap repairs are unsightly and usually not satisfactory. The repairs should be inconspicuous. Sometimes white cement is added to grey cement to match color.