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
Email: wdanskin@usgs.gov

Otay Trolley - SDOT (18S/2W-22E3-7)

Lithologic Summary

Land-surface elevation is 23.63 feet above NAVD88. Depth is in feet below land surface.  Drilled by U.S. Geological Survey using hydraulic rotary, March 15, 2008. Total depth drilled 1610 feet. Screened intervals: 1455-1495, 910-930, 540-560, 215-235, and 45-65 feet.

Depth (ft) Description
From To
0 65 Gravelly sand (M-VC, pebbles <30mm dia)
65 100 Slightly sandy silty clay (F-C)
100 125 Silty sand (F-C)
125 140 Gravel, sand, silt, clay
140 180 Silty sand (M-VC)
180 270 Gravelly sand (C-VC, pebbles <10 mm dia.)
270 310 Clayey silt
310 320 Sandy gravel
320 400 Sand (M-VC)
400 430 Sandy gravel
430 450 Clayey silt
450 480 Clayey silt (shell frags)
480 520 Clayey silt
520 560 Silty sand
560 700 Clayey silt
700 900 Clay
900 930 Silty sand (VF-F)
930 1,000 Clay
1000 1,100 Clayey silt
1100 1,160 Clay
1160 1,480 Silt/Clay
1480 1,500 Sandy silt/clay (C)
1500 1,540 Silt/Clay
1540 1,600 Sandy silt/clay