Thermal waters produced from large oil fields are currently the most important geothermal resources in Los Angeles County. Assuming that various technological and economic considerations are favorable, many of these fields are promising sources of heat for diverse applications outside the field operations. Otherwise, the County does not appear to have any large, near-surface geothermal resources.

The purpose of this project was to determine and evaluate possible geothermal resources for potential development at U.S. naval reservations in the greater San Diego, California area. The work was done through the auspices of a cooperative agreement between the U.S. Department of Energy, San Francisco Operations Office and the U.S. Department of Navy, China Lake Naval Weapons Center for joint research on geothermal energy at U.S. military installations.

The purpose of this project was to determine and evaluate sources of geothermal energy at two military bases in southern California, the Long Beach Naval Shipyard and Naval Station and the Seal Beach Naval Weapons Station. One part of the project focused on the natural geothermal characteristics beneath the naval bases. Another part focused on the geothermal energy produced by oilfield operations on and adjacent to each base. Results of the study are presented here for the U.S. Department of the Navy to use in its program to reduce its reliance on petroleum by the development of different sources of energy. The study was accomplished under a cooperative agreement between the U.S. Department of Energy's San Francisco Operations Office and the Department of the Navy's Naval Weapons Center, China Lake, California, for joint research and development of geothermal energy at military installations.

This report presents the results of geothermal resources investigations conducted in the Sonoma Valley area of California by the California Department of Conservation's Division of Mines and Geology. Included are the results from separate studies performed in two preceding years, of the southern and central Sonoma Valley area (1981-82) and the northern Sonoma Valley area (1982-83); also included are the results of a shallow temperature drilling program and general "wrap up" assessment of the resource conducted in 1983-84. The study was undertaken to learn more about the known low-temperature (20° - 90°C) geothermal resource in this area and to assess the potential of the resource for development and use by the local community.

This report presents the results of an investigation, by the California Division of Mines and Geology, of the geothermal resources of the northern Sonoma Valley area, California. A report on the geothermal resources of the southern Sonoma Valley area, (Youngs and others, 1983) indicated several patterns, trends, and anomalies that appeared to extend north and northwest in the valley. Study of the northern valley area was conducted to attempt to follow these trends and to determine whether significant geothermal resources exist in the area.

This report presents the results of the California Division of Mines and Geology's (CDMG) geothermal resource investigation of the Sonoma Valley area, California. The study was undertaken to learn more about the known low-temperature (20°_90°C) geothermal resource in this area and. to assess the potential of the resource for development and use by the local community. The project was conducted in compliance with the terms of the fourth-year contract (1981-82) with the U.S. Department of Energy (DOE) under the state-coupled program and performed under CDMG's Phase II site-specific geothermal resources studies program.

This report presents the" results of the California Division of Mines and Geology's (COM G) geothermal resource investigation of the Paso Robles area, California. The study was undertaken to learn more about the known geothermal resource In this area and to assess the potential of the resource for development and use by the local community. The project was conducted in compliance with the terms of the fourth-year contract (1981-82) with the U.S. Department of Energy (DOE) under the state-coupled program and performed under CDMG's Phase II site-specific geothermal resources studies program.

This addendum report presents the results of the California Division of Mines and Geology (CDMG) drilling program at Calistoga, California, which was the final geothermal-resource assessment investigation performed under terms of the second year contract (1979-80) between the u.s. Department of Energy (DOE) and the CDMG under the State Coupled Program. This report is intended to supplement information presented in CDMG's technical report for the project year, "Resource Assessment of Low-and Moderate-Temperature Geothermal Waters in Calistoga, Napa County, California."

Twenty-Seven thermal springs in Arizona, New Mexico, and Utah were sampled for detailed chemical and isotopic analysis. Sampling in New Mexico and Utah was confined to known geothermal resource areas as designated by the U.S. Geological Survey.