From abstract: "This report summarizes the geology of a shaft excavated for the proposed nuclear reactor and discusses geologic features on Bodega Head and on Point Reyes peninsula that relate to geologic aspects of earthquake-resistant design."

This report examines water quality, levels, and use for groundwater in the Eureka Area, Humboldt County, California. It includes maps, graphs, and other figures.

Purpose and scope: The purpose of this study was to develop a method for estimating the amount of subsurface return flow to the Colorado River in the Yuma area. This report presents a method that permits an approximate accounting of ground-water return flow from each side of the Colorado River in Yuma reach. The method presented in this report was developed specifically for application in the Yuma area. The validity of the assumptions inherent in the method was evaluated on the basis of the local hydrologic system. The applicability of the method to other hydrologic systems is not addressed in this report.

Purpose and scope: The purpose of this study was to develop a method for estimating the amount of subsurface return flow to the Colorado River in the Yuma area. This report presents a method that will permit an accounting of ground-water return flows from each side of the Colorado River in the Yuma reach. The estimates of return flow can be used by water-management agencies in determining return-flow credits for the States of Arizona and California.