San Diego Hydrogeology
Santa Ysabel - SDSY (12S/1W-34L2-5)
Lithologic Summary
Land-surface elevation is 402.23 feet above NAVD88. Depth is in feet below land surface. Drilled by U.S. Geological Survey using hydraulic rotary, October 23, 2010. Total depth drilled 355 feet. Screened intervals: 280-340, 190-210, and 70-90 feet.
Depth (ft) | Description | |
---|---|---|
From | To | |
0 | 19 | Sand (f-vc) w/ minor gravel (peb); Lt olive brown (2.5Y 5/6) |
19 | 30 | Silty Clay; V. dark grayish brown (2.5Y 3/2) |
30 | 66 | Sand (f-vc) w/ minor gravel (peb); Grayish green (GLEY2 5/10G) |
66 | 75 | Silty Sand (f-c) w/ minor clay; V dark grey (2.5Y 3/1) |
75 | 83 | Silty Clay; Brown (10YR 4/3) |
83 | 87 | Sand (m-vc) w/ gravel (peb); Grayish green (GLEY2 5/10G) |
87 | 100 | Clayey Silt; Brown (10YR 5/4) |
100 | 120 | Clayey Silty Sand (f-vc); Yellowish Brown (10YR 5/4) |
120 | 230 | Weathered bedrock; Biotite Hornblend Granodiorite; Salt & Pepper |
230 | 355 | Bedrock; Biotite Hornblend Granodiorite; Salt & Pepper |
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