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I I I I I I I I I I I I I I I I I I I OJ ~about 400 mg/l . C\Jvalues is due to ( .'J c;predominantly sodium The difference between the laboratory value and the field the fact that the dissolved ions in the water are not (Na) and chloride (Cl). The change in water quality and flow contribution with depth is interpreted to be the boundary between HSU-2 and HSU-3, Though no unusual lithologic change was reported on the driller's completion log of the well, a seismic reflection line run by the Colorado School of Mines along Highway 160 shows a strong reflector at a depth of about 2000 feet. That reflector is interpreted to be the Fish Canyon and Carpenter Ridge tuffs at the top of HSU-3, 2.3.3 Alamosa Geothermal Well Logging Geophysical logging of the Alamosa Geothermal Well was performed between August 26 and August 29, 1986. The logs run in that well were as follows: 1. Natural gamma (to 3960 feet) 2. Neutron (to 3960 feet) 3. Casing-collar locator (to 6075 feet) 4. Temperature (to 5735 feet) 5. Borehole-fluid resistivity (to 5740 feet) 6. Borehole flowmeter ("spinner") (to 6040 feet). The natural-gamma and the neutron logs were run in the Alamosa Geothermal Well because no reliable information regarding lithologies (rock types) is known to exist for that well. Those logs have been used to fill gaps in our knowledge of the lithologies of the deep confined aquifer at that location. The other logs were run to determine changes of water quality with depth, to estimate the geothermal gradient of the deep confined aquifer in the Alamosa area, and to estimate the rate and direction of vertical ground water leakage within the deep confined aquifer. The casing-collar locator log was run to try to verify the reported completion intervals in the well. Due to high temperatures deep in the well, electronics modules in several of the logging probes did not operate properly. The deepest log able to be recorded was the 2-7