Robertson’s has ten aggregate processing plants located in Southern California: San Diego, Cabazon, Banning, San Bernardino, Redlands, Rialto, Palmdale, Barstow and two in Lucerne as well as a rail system, delivering aggregate to the L.A. market from our Cabazon quarry, to provide for the aggregate needs of the industry. These plants perform aggregate reduction and washing operations, employing state-of-the-art machinery. Typical products include ready mixed concrete aggregate, bedding materials for underground utilities and crushed base materials. The quality of products from our processing plants are carefully monitored to ensure compliance with all applicable specifications. Our goal is to produce products that will consistently meet or exceed customer specification.