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

El Toyon Park - SDEP (17S/2W-16Q9-13)

Lithologic Summary

Land-surface elevation is 109.21 feet above NAVD88. Depth is in feet below land surface. Drilled by U.S. Geological Survey using hydraulic rotary, June 23, 2003. Total depth drilled 1308 feet. Screened intervals: 1260-1300, 920-960, 740-760, 410-430, and 150-170 feet.

Depth (ft) Description
From To
0 60 Slightly gravelly sandy silty clay; dark yellowish brown
60 150 Gravelly silty sand; dark yellowish brown
150 220 Slightly gravelly sandy clayey silt; dark yellowish brown
220 300 Gravelly silty sand; dark yellowish brown
300 430 Gravelly silty sand; light olive brown
430 470 Slightly gravelly sandy silty clay; olive brown
470 598 Gravelly silty sand; light olive brown
598 648 Slightly gravelly sandy silty clay; olive brown
648 760 Sandy clayey silt; dark olive gray
760 780 Silty sand; dark olive gray
780 830 Sandy clayey silt w/ shell fragments; dark olive gray
830 890 Sandy silt; dark greenish gray
890 940 Clayey silt w/ shell fragements; very dark greenish gray
940 1090 Clayey silt; very dark greenish gray
1090 1130 Sandy silt; olive gray
1130 1160 Sandy clayey silt; olive gray
1160 1200 Gravelly sand; olive gray
1200 1220 Gravelly silty clayey sand; olive gray
1220 1240 Sandy silty clay; olive gray
1240 1260 Gravelly silty clayey sand; olive gray
1260 1290 Slightly gravelly sandy silty clay; olive gray
1290 1320 Gravelly sand; olive gray