CITGO, a wholly owned subsidiary of PdVSA, controls 734,000 bbl/d of crude Oil refining capacity in the U.S. The company operates three product refiners (Lake Charles, LA; Corpus Christi, TX; Lemont, IL), two asphalt refineries (Paulsboro, NJ; Savannah, GA), and owns a 41 percent stake in Lyondells Houston, TX refinery. CITGO also operates a network of 14,000 retail Gasoline stations and numerous wholesale asphalt terminals. CITGO sources most of its Crude Oil under long-term contracts with PdVSA, though the Lemont facility receives most of its supply from Canada. PdVSA also owns shares in some U.S. crude oil refining capacity directly, including a 50 percent stake in the Chalmette facility in Louisiana and certain units at ConocoPhillips Sweeny, Texas refinery. In March 2004, CITGO announced that it plans to increase the crude processing capacity at the Lake Charles refinery to 450,000 bbl/d from the current 308,000 bbl/d, as part of the companys Tier II program. The expansion will include upgrades that will allow the refinery to process heavier crude streams from Venezuela.