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

Mile of Cars - SDMC (17S/2W-33D1-5)

Lithologic Summary

Land-surface elevation is 23.04 feet above NAVD88. Depth is in feet below land surface.  Drilled by U.S. Geological Survey using hydraulic rotary, June 26, 2005. Total depth drilled 1502 feet. Screened intervals: 1440-1480, 1100-1120, 700-720, 260-280, and 35-75 feet.

Depth (ft) Description
From To
0 80 Sand (S), M to VC sand, high mica %, burnt wood
80 150 Slightly sandy silty clay (M), Clay & silt with some M to C sand
150 180 Gravelly sand (GS), F to VC sand w/ grnls & pbls < 6mm dia.
180 200 Sandy Silty Clay (M), Clay & silt w/ VF to M sand
200 220 Sand (S), C to VC sand
220 230 Sandy Silty Clay (M), Clay & silt w/ VF to M sand
230 240 Sand (S), M to VC sand, high mica %
240 250 Sandy silty clay (sM), Clay & silt w/ VF to M sand
250 280 Slightly gravelly sand ((g)S), M to VC sand w/ grnls & pbls < 8mm dia.
280 300 Sandy clayey silt (sM), Silt & Clay w/ VF to M sand
300 330 Sand (S), C to VC sand
330 350 Clayey silty sand (mS), M to C sand w/ silt and clay
350 470 Sand (S), C to VC sand
470 490 Sandy clayey silt (sM), Silt & clay w/ VF to VC sand
490 560 Sand (S), C to VC sand
560 600 Sandy silty clay (sM), Clay & silt w/ VF to VC sand
600 760 Slightly gravelly sand ((g)S), M-VC sand w/ grnls & shells
760 770 Silty sand (zS), M to VC sand and silt
770 800 Sand (S), C to VC sand
800 810 Silty sand (zS), M to VC sand and some silt
810 870 Sand (S), F to C sand
870 960 Silty sand (zS), F to C sand w/ silt & clay , shells
960 980 Clay ( C), clay
980 1050 Silty clayey sand (mS), F to C sand w/ silt & clay, shells
1050 1070 Clay ( C), clay
1070 1220 Sand (S), F to C sand
1220 1280 Sandy clay (sC), Clay w/ F to M sand
1280 1320 Clayey sand (cS), F to C sand w/ clay
1320 1500 Sandy clayey silt (sM), Clay & Silt w/ shale, shell frag, F to C sand