Ground Water in the Redding Basin, Shasta and Tehama Counties, California

U.S. Geological Survey (USGS) | December 31st, 1983

The Redding Basin covers about 510 square miles in the northern part of the Central Valley of California and is surrounded by the Cascade Range, Klamath Mountains,and Coa

The Redding Basin covers about 510 square miles in the northern part of the Central Valley of California and is surrounded by the Cascade Range, Klamath Mountains,and CoastRanges. It is separated from the main part of the valley by the Red Bluff Arch, a subsurface geologic structure. Ground water in the Redding Basin is obtained principally from wells tapping continental deposits of Tertiary and (or) Quaternary age. These deposits are arranged in a synclinal structure that trends and plunges south- ward. They are deposited on the Chico Formation, a marine sedimentary unit, and a basement complex composed of older igneous, metamorphic, and sedimentary rocks. Recharge to the Redding ground-water basin is from subsurface inflow; infiltration of precipitation and applied irrigation water; and percolation from stream san dcreeks.

Ground Water in White River Valley, White Pine, Nye, and Lincoln Counties, Nevada

State of Nevada | July 1st, 1949

Ground-water conditions at Beale Air Force Base and vicinity, California

U.S. Geological Survey (USGS) | April 15th, 1980

The U.S. Geological Survey was asked by the Air Force to make a study of ground-water conditions at the base. This report and an earlier data report have resulted

The U.S. Geological Survey was asked by the Air Force to make a study of ground-water conditions at the base. This report and an earlier data report have resulted from the study. The purpose of the study was to appraise the ground-water resource in the vicinity of Beale Air Force Base with regard to source, occurrence, movement, and chemical quality. This information will be used in the long-term management of the water supply for the base. The scope of the study included identifying zones of poor-quality water that could affect the base water supply and providing suggestions for changes in pumping, well construction, and well-site selection that would improve the reliability of the water supply. Source material included drillers' logs, chemical analyses of ground water, water-level records, pumpage records, and previously published reports for the area.

Ground-Water Conditions in Las Vegas Valley, Clark County, Nevada, Part 1, Hydrogeologic Framework

U.S. Geological Survey (USGS) | July 1st, 1989

Click here for Part 2

Click here for Part 2

Ground-Water Conditions in Las Vegas Valley, Clark County, Nevada, Part 2, Hydrogeology and Simulation of Ground-Water Flow

U.S. Geological Survey (USGS) | July 1st, 1996

Click here for part 1

Click here for part 1

Ground-Water Conditions in the Eureka Area, Humboldt County, California, 1975

U.S. Geological Survey (USGS) | December 31st, 1978

Ground-water discharge determined from estimates of evapotranspiration, Death Valley regional flow system, Nevada and California

U.S. Geological Survey (USGS) | July 1st, 2001

Ground-Water Hydrology of the Hollister and San Juan Valleys San Benito County, California, 1913-68

U.S. Geological Survey (USGS) | August 31st, 1972

The Hollister and San Juan Valleys are within the Gilroy-Hollister ground-water basin. That part of the ground-water basin underlying the valleys consists of three subbas

The Hollister and San Juan Valleys are within the Gilroy-Hollister ground-water basin. That part of the ground-water basin underlying the valleys consists of three subbasins each of which contains two or more ground-water subunits. The subbasin and subunit boundaries are formed by known or postulated faults, folded sedimentary rocks, and igneous rocks.

Ground-water Quality in the Lompoc Plain, Santa Barbara County, California, 1983

U.S. Geological Survey (USGS) | June 13th, 1988

This report summarizes the results of a comprehensive study of ground-water quality in the Lompoc plain in western Santa Barbara County. Water-quality characteristics

This report summarizes the results of a comprehensive study of ground-water quality in the Lompoc plain in western Santa Barbara County. Water-quality characteristics in 1983 are described, and changes in water quality since the last comprehensive study in the early 1970's are documented. Ground water is the main source of water in the Lompoc plain. The younger alluvium is the major aquifer and consists predominantly of unconsolidated deposits of sand and gravel. The younger alluvium is as much as 180 feet thick and is divided into an upper member and a lower member throughout most of the plain. The lower member is the main water-bearing zone in the Lompoc plain. Long-term ground-water levels in most of the plain have not changed significantly since the 1940's. A seasonal water-level decline of about 15 feet in 1982 in the central part of the plain may be attributed to nearby military and agricultural pumping. Ground-water quality in the plain in 1983 tended to deteriorate from east to west. Dissolved-solids concentrations throughout the plain exceeded the U.S. Environmental Protection Agency secondary maximum contaminant level of 500 milligrams per liter for drinking water; in most of the plain, concentrations exceeded 1,000 milligrams per liter. In samples from some wells, concentrations of one or more of the following constituents sodium, chloride, nitrate, and iron exceeded primary or secondary maximum contaminant levels for drinking water. Concentrations of constituents in some samples also exceeded recommended levels for irrigation water. The predominant ions generally were calcium, magnesium, sulfate, and bicarbonate - except in the western part, where sodium and chloride were the predominant dissolved ions. From 1972 to 1983, dissolved-solids concentrations in the main water-bearing zone generally decreased in the central part of the plain but increased throughout most of the study area. The largest increases, greater than 1,000 milligrams per liter, were in the extreme western part of the plain.

Ground-Water Resources Inventory of the Lake Tahoe Basin, 2007

U.S. Geological Survey (USGS) | November 30th, 2007