San Diego Hydrogeology
Otay River - SDOR (18S/2W-23G2-6)
Lithologic Summary
Land-surface elevation is 70.85 feet above NAVD88. Depth is in feet below land surface. Drilled by U.S. Geological Survey using hydraulic rotary, December 13, 2008. Total depth drilled 1472 feet. Screened intervals: 1420-1460, 950-970, 550-570, 220-240, and 70-90 feet.
| Depth (ft) | Description | |
|---|---|---|
| From | To | |
| 0 | 10 | Gravelly sand; m-vc sand w/ granules-sm pebbles; olive gray (5Y 5/2) |
| 10 | 20 | Gravelly sand; m-vc sand w/ granules; grayish brown (2.5Y 5/2) |
| 20 | 30 | Gravelly sand; m-vc sand w/ granules; lt olive brown (2.5Y 5/4) |
| 30 | 40 | Gravelly sand; m-vc sand w/ granules; dk yellowish brown (10YR 4/6) |
| 40 | 60 | Gravel; granules-med pebbles; various colors |
| 60 | 70 | Clayey silt; silt w/ clay; olive (5Y 4/3) |
| 70 | 80 | Silty sandy gravel; granules-med pebbles w/ vf-vc sand and silt; olive gray (5Y 4/2) |
| 80 | 200 | Clayey silt; silt w/ clay and shell fragments; v dk gray (5Y 3/1) |
| 200 | 240 | Clayey silt; silt w/ clay and minor shell fragments; v dk gray (5Y 3/1) |
| 240 | 320 | Silt; silt; dk gray (5Y 4/1) |
| 320 | 550 | Clayey silt; silt w/ clay; v dk gray (5Y 3/1) |
| 550 | 560 | Sand; vf-coarse sand w/ shell fragments; dk gray (5Y 4/1) |
| 560 | 570 | Clayey silt; silt w/ clay; v dk gray (5Y 3/1) |
| 570 | 580 | Sandy clay; clay w/ med-coarse sand; greenish gray (10Y 5/1) |
| 580 | 610 | Clay; clay; grayish brown (2.5Y 5/2) |
| 610 | 630 | Clay; clay; grayish brown (10YR 5/2) |
| 630 | 650 | Clay; clay; lt brownish gray (2.5Y 6/2) |
| 650 | 750 | Clay; clay; grayish brown (2.5Y 5/2) |
| 750 | 880 | Sandy clayey silt; silt w/ clay & vf-med sand; grayish brown (2.5Y 5/2) |
| 880 | 910 | Clayey silty sand; vf-coarse sand w/ silt & clay; grayish brown (2.5Y 5/2) |
| 910 | 920 | Clay; clay; brown (10YR 5/3) |
| 920 | 940 | Gravelly sand; med-vc sand w/ granules-sm pebbles; grayish brown (2.5Y 5/2) |
| 940 | 1,030 | Clayey silty gravelly sand; vf-vc sand w/ granules, silt & clay; lt olive brown (2.5Y 5/3) |
| 1030 | 1,120 | Silty gravelly sand; vf-vc sand w/ granules & silt; grayish brown (2.5Y 5/2) |
| 1120 | 1,140 | Sandy clay; clay w/ med-vc sand; lt brownish gray (2.5Y 6/2) |
| 1140 | 1,472 | Clayey silty sand; vf-vc sand w/ silt & clay; grayish brown (2.5Y 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