By Michael Land, Rhett R. Everett,
Steven M, Crawford,
U.S. GEOLOGICAL SURVEY
Open-File Report 01-277
Sacramento, California 2001
Prepared in cooperation with the Water Replenishment
District of Southern California
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In 1995, the U.S. Geological Survey (USGS), in cooperation with the Water Replenishment District of Southern California (WRDSC), began a study to examine ground-water resources in the Central and West Coast Basins in Los Angeles County, California. The study characterizes the geohydrology and geochemistry of the regional ground-water flow system and provides extensive data for evaluating ground-water management issues. This report is a compilation of geologic, hydrologic, and water-quality data collected from 24 recently constructed multiple-well monitoring sites for the period 1995–2000.
Descriptions of the collected drill cuttings were compiled into lithologic logs, which are summarized along with geophysical logs—including gamma-ray, spontaneous potential, resistivity, electromagnetic induction, and temperature tool logs—for each monitoring site. At selected sites, cores were analyzed for magnetic orientation, physical and thermal properties, and mineralogy. Field and laboratory estimates of hydraulic conductivity are presented for most multiple-well monitoring sites. Periodic water-level measurements are also reported. Water-quality information for major ions, nutrients, trace elements, deuterium and oxygen-18, and tritium is presented for the multiple-well monitoring locations, and for selected existing production and observation wells. In addition, boron-11, carbon-13, carbon-14, sulfur-34, and strontium-87/86 data are presented for selected wells.
Abstract
Introduction
Purpose and Scope
Description of Study Area
Acknowledgments
Ground-Water Monitoring Network
Geologic Data Collection
Lithologic Descriptions
Geophysical Logs
Core Measurements
Hydrologic Data Collection
Water-Level Measurement
Hydraulic Properties
Water-Quality Data Collection
Sample Collection
Field Measurements
Sample Handling, Preservation, and Analysis
Accessing Data
Summary
References Cited
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