California Water Science Center (CAWSC) - San Diego Hydrogeology Project (SDH)

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San Diego Hydrogeology

Welcome to the United States Geological Survey (USGS) San Diego Hydrogeology 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: April 2016

Some additional data may be available from the USGS database National Water Information System (NWIS).

Project Chief: Wes Danskin
Phone: 619-225-6132
Email: wdanskin@usgs.gov

Aqua Culture - 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?