Thomas Petroleum, based in Texas, developed a six-acre diesel fuel distribution facility in Williston, North Dakota. The construction consisted of a one-story, slab-on-grade, metal building with a footprint of approximately 10,000 square feet and a tank farm consisting of four, 14-foot diameter, 50,000-gallon tanks used to store various types of diesel fuel. GTA provided subsurface exploration, laboratory testing, and engineering analysis and construction observation and testing services. The geotechnical evaluation included recommendations for foundation support, slab support, tank foundation/containment pad support, site grading, groundwater control, and utility construction. Prior to Thomas Petroleum purchasing the site, the property had been graded, but the fill was undocumented. GTA provided supplemental evaluation, observation and testing services for ground improvement resulting in saving substantial project development expenditures.