San Diego Hydrogeology
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) |
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