 Many other oil companies had operations in the area, including larger companies such as Shell, Texaco, Exxon, Mobil, Gulf, and ARCO, as well as smaller operations (but with a large local presence) such as Santa Fe Energy, Berry Petroleum, Tannehill, M.H.Whittier, and lately Plains Exploration & Production.In the mid-1990s, according to California's Division of Oil, Gas, and Geothermal Resources (DOGGR), there were 68 operating companies working the Midway-Sunset field alone.