The experimental well, HGP-A, drilled under the auspices of the Hawaii Geothermal Project, is located on the island of Hawaii near the eastern rift of Kilauea volcano. Drilling was completed to a depth of 6450 feet in April 1976. The well is cased to 2230 feet below the surface, which is 600 feet above sea level, with a slotted liner running from the end of the casing to bottomhole. Cuttings and core samples obtained during drilling indicate that the region is composed of volcanic basalt with a profile that contains a zone of open fractures (3390-4500 feet P and a zone of partially sealed fractures (4500-6450 feet) as shown in Figure 1. The well has undergone five flash discharge tests since an initial flashing on July 2, 1976. The maximum bottomhole temperature during quiescent periods has been measured at 358?C. water samples were taken at various times under varying flow conditions and analyzed. The median values for the downhole samples are shown in Table 1.

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