California Water Science Center (CAWSC) - San Diego Hydrogeology Project (SDH)

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San Diego Hydrogeology

Welcome to the United States Geological Survey (USGS) San Diego Hydrogeology project website, which provides geologic and hydrologic information for the transboundary San Diego–Tijuana area, USA and Mexico. This website provides background information about the project; a variety of news items; a large amount of data, in particular for USGS multiple-depth, monitoring-well sites; geologic and hydrologic models; and additional resources including photos, illustrations, and references. Last updated: April 2016

Some additional data may be available from the USGS database National Water Information System (NWIS).

Project Chief: Wes Danskin
Phone: 619-225-6132

Boundary Waters - SDBW (19S/2W-2C7-11)

Lithologic Summary

Land-surface elevation is 45.26 feet above NAVD88. Depth is in feet below land surface. Drilled by U.S. Geological Survey using hydraulic rotary, August 5, 1995. Total depth drilled 1,430 feet. Screened intervals: 1340-1360, 1170-1190, 945-965, 580-600, and 260-280 feet.

Depth (ft) Description
From To
0 20 Sand, fine to medium
20 60 Sand, fine to very coarse, poorly sorted shell fragments
60 150 Sandy gravel, medum to very
150 190 Sand, fine
190 310 Silty sand, very fine sand to medium
310 650 Clayey sand with very fine to fine sand
650 670 Sandy clay
670 710 Sandy silt, very fine sand to medum
710 770 Clayey silt, some fine sands
770 830 Sandy clay
830 950 Clayey silt, some very fine to fine sands
950 970 Sandy silt
970 990 Silty sand
990 1030 Sand very fine to very coarse
1030 1050 Silty sand
1050 1430 Sand, very fine to medum sand