Geologic, Hydrologic, and Water-Quality Data From Multiple-Well Monitoring Sites in the Central and West Coast Basins, Los Angeles County, California, 1995–2000

By Michael Land, Rhett R. Everett, Steven M, Crawford,



Open-File Report 01-277

Sacramento, California 2001

Prepared in cooperation with the Water Replenishment District of Southern California

Cover (3.2 MB)
Main Text of Report (400 KB PDF)
Figures 3–10 (1.3 MB PDF)
Figures 11–18 (1.3 MB PDF)
Figures 19–26 (1.5 MB PDF)
Tables 2–21 (996 KB PDF)
Tables 22–31 (960 KB PDF)
Tables 32–36 (1.5 MB PDF)

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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.

Table of Contents



Purpose and Scope

Description of Study Area


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


References Cited

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Water Resources of California

U.S. Department of the Interior, U.S. Geological Survey
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