San Diego Hydrogeology
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 |
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