Discharge of Sumikawa well S-4 in the fall of 1986 was accompanied by in situ boiling. In May of 1989, cold water was injected intermittently into well S-4. During both of these tests, a pressure response was observed in KY-1. In this paper, a new interpretation of the latter pressure interference data is presented. While interpretation of the 1989 test is straightforward, in situ boiling during the 1986 test creates substantial difficulties in assigning an ěeffective discharge rateî. Because of uncertainties in the ěeffective discharge rateî history for the 1986 test, the distances to the various reservoir boundaries are not well constrained.

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