San Diego Hydrogeology
Balboa Park - SDBP (17S/3W-1K1-5)
Lithologic Summary
Land-surface elevation is 99.16 feet above NAVD88. Depth is in feet below land surface. Soil and rock color notation from Munsell Color (1994). Drilled by U.S. Geological Survey using hydraulic rotary to 1,600 feet, March 2008. Total depth drilled 1,501ft. Well casing to 1,490 ft. Screened intervals: 1,470-1,490, 1,020-1.040, 560-580, 220-240, and 100-120ft.
| Depth (ft) | Description | |
|---|---|---|
| From | To | |
| 0 | 10 | Sandy gravel; granules-med pebbles w/ med-vc sand; yellowish brown (10YR 5/4) |
| 10 | 100 | Sandy gravel; granules-med pebbles w/ fine-vc sand; olive (5Y 5/3) |
| 100 | 160 | Sandy gravel; granules-sm pebbles w/ fine-vc sand and shell frags; olive (5Y 5/3) |
| 160 | 270 | Sandy silt; silt w/ vf-fine sand and shell frags; v dk gray (5Y 3/1) |
| 270 | 460 | Clayey silt; silt w/ clay and some shell frags; v dk gray (5Y 3/1) |
| 460 | 500 | Silty sand; vf-c sand w/ silt and some shell frags; v dk gray (5Y 3/1) |
| 500 | 560 | Silty clay; clay w/ silt; v dk gray (5Y 3/1) |
| 560 | 620 | Silty sand; vf-c sand w/ silt and some shell frags; v dk gray (5Y 3/1) |
| 620 | 720 | Clay; clay; grayish brown (2.5Y 5/2) |
| 720 | 830 | Clayey sandy silt; silt w/ vf sand and clay; lt olive brown (2.5Y 5/3) |
| 830 | 940 | Sandy silt; silt w/ vf sand; grayish brown (2.5Y 5/2) |
| 940 | 1,260 | Gravel; granules-med pebbles; v dk grayish brown (2.5Y 3/2) |
| 1260 | 1,501 | Clayey silt; silt w/ clay and some vf-medsand; dk gray (2.5Y 4/1) |
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