Problem When a sinkhole approximately 30 feet in diameter appeared on I-15 near Scipio, Utah, the Utah Department of Trans- portation (UDOT) had an emergency on their hands. The sinkhole caused roadway settlement of 10 inches in just one week. This rapid settlement posed an immediate danger to traffic on the busy interstate and needed to be leveled as soon as possible. As a temporary measure, UDOT applied asphalt patching to level the roadway, but UDOT needed a more permanent solution without shutting down the interstate. UDOT contacted URETEK because of their work on previous successful sinkhole stabilization projects. Analysis URETEK offered to provide a preliminary plan for stabilization contingent on future soil testing. The preliminary injection plan assumed that the first 12 f

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