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Mixed Base Rock is produced from 100 percent crushed concrete, asphalt concrete, and brick products. It is designed to form a base for roads, parking lots, driveways and sidewalks. This material may also be used as sub-base for building foundations. Class II Base Rock meets the specifications of the State of California Standard Specifications, Section 26. The main difference between this Mixed Base Rock and our Recycled Class II Base Rock is that the Mixed Base Rock has a slight pink tint due to the crushed brick products in the material.