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

Home & Federal - SDHF (17S/2W-5Q1-6)

Lithologic Summary

Land-surface elevation is 82.84 feet above NAVD88. Depth is in feet below land surface. Drilled by U.S. Geological Survey using hydraulic rotary, November 26, 2011. Total depth drilled 1640 feet. Screened intervals: 1580-1620, 1020-1040, 770-790, 430-450, 230-250, and 90-110 feet.

Depth (ft) Description
From To
0 10 Gravelly sandy silt; silt w/ vf-vc sand & granules-sm pebbles; dk yellowish brown (10YR 3/4)
10 50 Sandy gravel; gran-vl peb w/ m-vc sand; dk yellowish brown (10YR 3/4)
50 60 Sand; c-vc sand; lt yellowish brown (2.5Y 6/3)
60 70 Silt; silt; lt yellowish brown (2.5Y 6/3)
70 90 Sandy gravel, gran-med peb and m-vc sand; lt yellowish brown (2.5Y 6/4)
90 100 Silt; silt; lt yellowish brown (2.5Y 6/3)
100 110 Gravelly sand; c-vc sand w/ gran; lt yellowish brown (2.5 6/3)
110 120 Gravel; gran-lg peb; various colors
120 125 Gravelly sand; m-vc sand w/ granules; yellowish brown (10YR 5/6)
125 130 Sandy silt; silt w/ m-vc sand; grayish brown (2.5Y 5/2)
130 140 Silt; silt; olive brown (2.5Y 4/4)
140 160 Silt; silt; v dk gray (5Y 3/1)
160 220 Silt; silt w/ shell fragments; dk olive gray (5Y 3/2)
220 360 Silt; silt; dk olive gray (5Y 3/2)
360 380 Sandy silt; silt w/ m-vc sand; dk olive gray (5Y 3/2)
380 600 Silt; silt; dk olive gray (5Y 3/2)
600 620 Silty sand; vf-vc sand w/ silt; dk olive gray (5Y 3/2)
620 740 Clayey silt; silt w/ clay; dk grayish brown (10Y 4/2)
740 850 Silty clay; clay w/ silt; grayish brown (2.5Y 5/2)
850 860 Silty clay; clay w/ silt; grayish brown (10YR 5/2)
860 940 Clayey silt; silt w/ clay; grayish brown (2.5Y 5/2)
940 1,030 Silty sand; vf-m sand w/ silt; grayish brown (2.5Y 5/2)
1030 1,070 Silty sand; m-vc sand w/ silt; grayish brown (2.5Y 5/2)
1070 1,100 Silty clay; clay w/ silt; lt olive brown (2.5Y 5/3)
1100 1,130 Gravelly silty sand; vf-vc sand w/ silt & gran-sm peb; lt olive brown (2.5Y 5/3)
1130 1,200 Silty clay; clay w/ silt; brown (10YR 5/3)
1200 1,250 Sandy silt; silt w/ vf-m sand; lt olive brown (2.5Y 5/3)
1250 1,300 Clayey silt; silt w/ clay; grayish brown (2.5Y 5/2)
1300 1,580 Slightly gravelly silty sand; vf-vc sand w/ silt & minor gran-sm peb; brown (10YR 5/3)
1580 1,720 Silty clay; clay w/ silt; dk olive gray (5Y 3/2)