Specifications include, but are not limited to: Provide fine aggregate consisting of clean, sound, durable particles, uniform in quality and free from wood, bark, roots and other deleterious material. The Engineer may consider the following as the basis for acceptance of fine aggregate for portland cement concrete: (1) Results of laboratory tests, (2) Behavior under natural exposure conditions, (3) Behavior of portland cement concrete with aggregate from the same or similar geological formations or deposits, and (4) Any other tests or criteria as deemed appropriate by the Engineer in conjunction with the Concrete Engineer. Provide fine aggregate from natural sand. If producing fine and coarse aggregates simultaneously from natural gravel deposits during the same operation, the Contractor may provide fine aggregate containing particles of crushed rock.