Page 10 Case Study D - Project Tunnel Summary Location: Wisconsin, United States Application: Micro-Tunneling Water-Based Drilling Fluid – Thee Projects System Configuration: Turn-Key CSI-D4 Fully-Integrated Package Challenges / Problems: i. Due to the nature of micro-tunneling, there can be hundreds-of-tons of waste solids (i.e. “cuttings”) generated. Complicating matters further is the fact that micro-tunneling is done at the surface, eliminating the option to use oil-based drilling fluids. Instead, high volumes of engineered drilling fluids are used. The more drilling fluid lost with the cuttings, the higher the cost of boring. ii. The application in question was to drill through large sections of limestone. Given the soft and hydrophilic nature of the lime

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