The Jollyville Transmission Main is a 6.5 mile long treated water tunnel that runs from a new water treatment plant to the Jollyville Reservoir in Austin, Texas. The tunnel is being constructed in an environmentally sensitive area, and as such employs various mitigation measures to address the areas of concern. Of particular concern was the Four Points working shaft, which was constructed through a formation that hosts groundwater which feeds springs that are vital to the habitat of the Jollyville salamander. This paper discusses the chemical grouting program that was employed at the Four Points shaft to reduce groundwater seepage into the shaft to satisfactory levels.
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