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

Naval Base - SDNB (17S/2W-20F1-5)

Lithologic Summary

Land-surface elevation is 12.25 feet above NAVD88. Depth is in feet below land surface.  Drilled by U.S. Geological Survey using hydraulic rotary, July 24, 2006. Total depth drilled 1501 feet. Screened intervals: 1460-1500, 660-680, 180-200, 80-85, and 20-25 feet.

Depth (ft) Description
From To
0 60 Silty sand; med-vc sand with silt; lt olive brown (2.5Y 5/3)
60 80 Silt; silt; dk yellowish brown (10YR 4/4)
80 90 Sandy gravel; granules with vc sand; grayish brown (10YR 5/2)
90 150 Sandy clay; clay with med-vc sand; dk grayish brown (10YR 4/2)
150 210 Gravelly sand; coarse-vc sand with granules; brown (10YR 4/3)
210 230 Sandy silt; silt with med-coarse sand and shell fragments; olive gray (5Y 4/2)
230 380 Gravelly sand; med-vc sand with granules; lt olive brown (2.5Y 5/3)
380 460 Clay; clay; dk grayish brown (10YR 4/2)
460 690 Silty sand; med-vc sand with silt; olive brown (2.5Y 4/3)
690 740 Sandy clay; clay with med-coarse sand; lt olive brown (2.5Y 5/3)
740 840 Silty sand; med-vc sand with silt; olive brown (2.5Y 4/3)
840 860 Clay; clay; lt olive gray (5Y 6/2)
860 880 Sandy silt; silt with med-vc sand; lt olive brown (2.5Y 5/3)
880 890 Clay; clay; lt olive gray (5Y 6/2)
890 1,030 Silty sand; med-vc sand with silt; grayish brown (2.5Y 5/2)
1,030 1,140 Sand; med-vc sand; olive gray (5Y 4/2)
1,140 1,310 Silty sand; vf-vc sand with silt; olive gray (5Y 4/2)
1,310 1,370 Silty sand; med-vc sand with silt; dk greenish gray (10Y 4/1)
1,370 1,440 Sandy silt; silt with coarse sand; dk greenish gray (10Y 4/1)
1,440 1,501 Sand; vf-vc sand; olive gray (5Y 5/2)