San Diego Hydrogeology
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) |
Project Chief: Wes Danskin
Phone: 619-225-6132
Email: wdanskin@usgs.gov
Welcome to the United States Geological Survey (USGS) San Diego Hydrogeology (SDH) 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: July 2023.
Some additional data may be available from the USGS database National Water Information System (NWIS).
Questions about San Diego Hydrogeology? Please contact Wes Danskin (email: wdanskin@usgs.gov or send a letter). 619.225.6132