The AT&SF railroad trestle bridge extends over one-half mile across the Trinity River floodplain. Portions of that bridge were slated for demolition to make room for floodplain/ levee improvements and new infrastructure. Kendall-Freese & Nichols, Inc., was engaged to provide engineering services needed in advance of work by U.S. Army Corps of Engineers, and engaged Targus under subcontract to conduct surveys for lead and asbestos. The surveys focused on metal (steel), coatings, concrete, and wood. Materials sampled included gray and black sealants, black felt, white/ gray Portland cement concrete, asphaltic concrete, and black tar taken from each homogeneous material.
Following single-sample detections of asbestos in limited areas of asphalt, Targus released additional samples placed on hold and collected additional samples to confirm that the asbestos detected in asphalt was actually a result of a separate layer of grey sealant. The survey reports identified each homogeneous material, its approximate quantity, and the reported asbestos-containing material expressed as a percentage of the whole. There were no identified painted and/or coated surfaces during the visual inspection.