3. Aggregates
1 General
a. Aggregate used by each Manufacturer/Supplier shall be obtained from a single source throughout the course of the job."
"4. Water
a. The water used for mixing water, ice, curing, or any other function relating to the placement of concrete shall be clean and fresh, and free from harmful matter in accordance with the relevant Mix Water Specification."
"5. Compressive Strength of Concrete
The characteristic compressive strength of concrete at 28 days shall not be less than the following:
Structural Concrete: 24MPa unless noted otherwise"