San Diego Hydrogeology
Aquaculture - SDAQ (16S/2W-18J3-7)
Lithologic Summary
Land-surface elevation is 59.87 feet above NAVD88. Depth is in feet below land surface. Drilled by U.S. Geological Survey using hydraulic rotary, November 22, 2004. Total depth drilled 949.5 feet. Screened intervals: 920-940, 880-900, 840-860, 710-730, 465-485, 145-165, and 30-50 feet.
| Depth (ft) | Description | |
|---|---|---|
| From | To | |
| 0 | 20 | Sandy silt, Silt to F sand, brown 10YR 4/3 |
| 20 | 50 | Silty gravelly sand, Silt to small pebbles, 10YR4/3 to 5GY 4/1 |
| 50 | 70 | Sand, M to VC sand |
| 70 | 100 | Gravelly sandy silt, Silt w/ VF to M sand and S pebbles, 10Y 6/1 |
| 100 | 120 | Clayey silt, Silt w/ clay, dark greenish gray10Y 3/1 to 10Y 4/1 |
| 120 | 140 | Silty gravelly sand, F to C sand w/ small pebbles and silt, 10Y 3/1 |
| 140 | 160 | Clayey silt, Silt w/ clay, drk grn gray 10Y 3/1 |
| 160 | 170 | Sand, C to VC sand |
| 170 | 200 | Clayey silt, Silt w/ clay, drk grn gray 10Y 3/1 |
| 200 | 230 | Sandy silt, Silt w/ C to VC sand, drk gray N 4/1 |
| 230 | 240 | Sand, C to VC sand |
| 240 | 370 | Sandy clayey silt, Silt w/ clay and VF to F sand, 10Y 3/1 |
| 370 | 380 | Sandy silt, Silt w/ C to VC sand, 10Y 3/1 |
| 380 | 420 | Sandy clayey silt, Silt w/ clay and VF to F sand, 10Y 3/1 |
| 420 | 620 | Silty sand, F to VF sand and silt, 10Y 3/1 |
| 620 | 640 | Silty sand, F to VF sand w/ silt and C to VC sand |
| 640 | 690 | Silty sand, F to VF sand and silt, 10Y 3/1 |
| 690 | 740 | Silty sand, F to VF sand w/ silt and C to VC sand |
| 740 | 830 | Sandy silty clay, Clay w/ silt and VF -VC sand, Lt olv brn 2.5Y 5/4 |
| 830 | 860 | Sandy silty clay, Clay w/ silt and VF to VC sand, drk gray N 4/1 |
| 860 | 890 | Sandy silt, Silt w/ VC sand, 10Y 5/1 (volcanic frags in sand) |
| 890 | 920 | Sandy silt, Silt w/ VC sand, N 4/1, (volcanic frags in sand) |
| 920 | 940 | Sandy silt, Silt w/ VC sand, 10Y 5/1 (volcanic frags in sand) |
| 946 | 949.5 | core: fractured hard rock - San Diego Peak Volcanics? |
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