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

Chollas Park - SDCP (16S/2W-34G1-6)

Lithologic Summary

Land-surface elevation is 344.50 feet above NAVD88. Depth is in feet below land surface. Drilled by U.S. Geological Survey using hydraulic rotary, June 8, 2011. Total depth drilled 1100 feet. Screened intervals: 1040-1060, 980-1000, 920-940, 760-780, 520-540, 330-350, 140-160, and 30-50 feet.

Depth (ft) Description
From To
0 3 Sandy (vf-vc) gravel (sm-m peb); light yellowish brown (2.5Y 6/4)
3 7 Clay; light yellowish brown (2.5Y 6/4)
7 20 Gravelly (gran.-cob.) sand (vf-vc); light yellowish brown (2.5Y 6/4)
20 84 Sandy (vf-vc) gravel (gran.-cob.); dark yellowish brown (10YR 4/4)
84 114 Clayey sandy (vf-vc) gravel (gran.-boulder); light yellowish brown (2.5Y 6/4)
114 129 Sandy (vf-vc) clayey gravel (gran.-cob.); light yellowish brown (2.5Y 6/4)
129 160 Sandy (vf-vc) gravel (gran.-boulder); greenish gray (10GY 6/1)
160 195 Clayey sandy (vf-vc) gravel (gran.-boulder); olive gray (5Y 5/2)
195 234 Sandy (vf-vc) clayey gravel (gran.-cob.); olive gray (5Y 5/2)
234 250 Sand (vf-vc); light yellowish brown (2.5Y 6/3)
250 285 Clayey sand (vf-vc); light brownish gray (2.5Y 6/2)
285 315 Silty sandy (vf-m) clay; greenish gray (5GY 6/1)
315 398 Clayey sand (vf-vc); light olive brown (2.5Y 5/3)
398 417 Sandy (vf-vc) clay; very dark grey (5Y 3/1)
417 421 Sand (m-vc); very dark grey (5Y 3/1)
421 442 Sandy (vf-vc) gravel (cob.-boulder?); olive gray (5Y 5/2)
442 467 Sandy (vf-vc) gravel (peb.- boulder?); olive (5Y 5/3)
467 513 Clayey sandy (vf-vc) gravel (gran.-boulder?); olive gray (5Y 4/2)
513 535 Sandy (vf-vc) gravel (gran.-boulder); olive gray (5Y 5/2)
535 578 Clayey sandy (vf-vc) gravel (gran.-boulder?); olive gray (5Y 5/2)
578 590 Sandy (vf-vc) gravel (peb.- boulder?); olive gray (5Y 4/2)
590 615 Clayey sandy (vf-vc) gravel (gran.-boulder); olive gray (5Y 4/2)
615 665 Sandy (vf-vc) clayey gravel (gran.-cob.); olive gray (5Y 5/2)
665 704 Clayey silty sand (vf-vc); greenish gray (10GY 5/1)
704 736 Gravelly (gran) sand (vf-vc); greenish gray (10GY 6/1)
736 760 Clayey sandy (vf-m) silt; greenish gray (10GY 6/1)
760 800 Clayey silty sand (vf-m); greenish gray (10GY 5/1)
800 810 Slightly gravelly (gran.) clayey sand (f-vc); greenish gray (10Y 6/1)
810 877 Slightly gravelly (gran.) sandy (f-vc) clay (Weathered Bedrock); greenish gray (10Y 6/1)
877 1,100 Strongly welded brecciated lapilli tuff (Bedrock); very dark greenish gray (10Gy 3/1)