LABORATORY

•DELEK REFINING LTD•SASOL NORTH AMERICA / FLUOR ENTERPRISES•EXXON MOBIL CHEMICAL•CITGO PETROLEUM•VALERO REFINING DENVER•VALERO REFINING MCKEE•VALERO REFINING WILMINGTON•GEORGIA GULF CHEMICAL CO. PLAQUEMINE•ERGON REFINING, INC. VICKSBURG•CELANESE CHEMICAL PASADENA
•SOUTHWEST RESEARCH INSTITUTE SAN ANTONIO•OXEA CHEMICALS BAY CITY•ENTERPRISE PRODUCTS MONT BELVIEU•DELEK REFINING EL DORADO•FLINT HILL RESOURCES CORPUS CHRISTI•FORMOSA PLASTICS USA POINT COMFORT•SAN ANTONIO WATER SYSTEMS