Lindsay Limestone is an argillaceous limestone encountered in Southern Ontario, Canada. The Lindsay formation is regarded as a suitable geologic medium for the construction of a Deep Geologic Repository for storing low to intermediate level nuclear waste. The Lindsay Limestone is a nodular argillaceous rock with very low permeability, requiring the use of hydraulic pulse tests for the measurement of its permeability characteristics. The paper describes the triaxial testing facility, the theoretical basis for the test and the procedures used to analyze the experimental results for estimating the permeability of the Lindsay Limestone. The results are compared with the data available in the literature.