United Rock Products

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First mined in 1929, United Rock Products is a 300-acre plant located in Irwindale, Calif. There, virgin aggregate material is processed into sand and gravel through cutting-edge crushing and screening operations. Whether by making custom blends or creating new products, the company has the knowledge and commitment to meet even the most specialized customer needs. Its automated truck loadout system consists of 12 bins situated above truck scales. This state-of-the-art system can load, weigh and ticket in as little as one minute. What's more, close freeway access allows its customers to be on the road and delivering material to their job site in minutes. United Rock Products is part of Sully-Miller, a Southern California construction materials supplier for the region's infrastructure. Its services and products include aggregates, asphalt concrete, underground, street and highway construction, essential for sustained economic and cultural development throughout the region.