Compilation of selected ground-water-quality data from the San Joaquin Valley, California

Ground-water-quality monitoring network design for the San Joaquin Valley ground-water basin, California

“…The results of the study indicated that, except for some local decreases in sulfate concentrations in the unconfined aquifer and local increases in boron in both the unconfined and confined aquifers, general inorganic water quality remained the same in both aquifers. Fogelman (1982) attempted to separate by aquifer the wells for the San Joaquin Valley in the water-quality file of the Geological Survey, but he found that data were insufficient for mapping ground-water types. Determining which aquifer furnishes water to particular wells in the San Joaquin Valley can be a difficult and time-consuming task, as shown in Davis and Hall (1959, p. 31-34), and as became apparent during preparation of the 1980 inventory of active ground-water-quality monitoring networks presented in Glass and others (1981).…”