GS Engineering & Construction Corp., South Korea\'s fourth-largest builder, said Monday it will build a US$3.7 billion petrochemical plant in Kazakhstan with British and German partners. GS E&C said the proposed plant in the Tengiz and Karabatan regions, about 1,500 kilometers southwest of the capital Astana, will have an annual production capacity of 400,000 tons of polyethylene, a raw material used in making plastics. The South Korean builder said its share of the project came to $1.4 billion, with British energy services provider Petrofac and Linde AG, the German industrial gas producer, holding the rest.