Founded in 1928, Ozinga produces and delivers ready-mix concrete to customers throughout Chicagoland area and northern Indiana. Its affiliates include Chicago Cement, Ozinga Aviation, Midwest Marine Terminal and Entr e Kitchen. Ozinga provides full-service bulk material sales and delivery through Ozinga Transportation, which maintains a fleet of trucks and has access to more than 100 different quarries. Ozinga Transportation s equipment includes over 50 semi-dump trailers and flatbed trucks, as well as various unloading equipment, including pumps, excavators, loaders, conveyors and lift cranes. It serves the chemical, environmental and construction industries. Ozinga operates an online store that sells apparel, headwear, golf towels, bags, collectible items and a range of decorative concrete products. In addition, its Web site has a feature of concrete calculator. The company has a location in Plainfield, Ill.