San Diego Hydrogeology
Lagoon Drive - SDLD (18S/2W-5J1-6)
Lithologic Summary
Land-surface elevation is 18.12 feet above NAVD88. Depth is in feet below land surface. Drilled by U.S. Geological Survey using hydraulic rotary, February 2 through March 25, 2017. Total depth drilled 2657.4 feet. Screened intervals: 2580-2620, 2180-2200, 1110-1130, 620-640, 180-200, and 42-47 feet.
| Depth (ft) | Description | |
|---|---|---|
| From | To | |
| 0 | 12 | Silty clayey sand (vf-vc); olive brown (2.5Y 4/3) |
| 12 | 23 | Slightly gravelly (gran.) sand (m-vc); light olive brown (2.5Y 5/3) |
| 23 | 54 | Sandy (vf-m) clayey silt; light olive brown (2.5Y 5/4) |
| 54 | 120 | Gravelly (gran.-lg. peb.) sand (m-vc); light yellowish brown (2.5Y 6/4) |
| 120 | 181 | Slightly gravelly (gran.-sm. peb.) clayey sand (vf-vc) w/ shell frag. (2-20 mm); light yellowish brown (2.5Y 6/3) |
| 181 | 262 | Slightly gravelly (gran.-lg. peb.) sand (vf-vc) w/ minor clay; yellowish brown (10YR 5/4) |
| 262 | 289 | Clayey sand (vf-vc) w/ trace gravel (gran.-med. peb.); brown (10YR 5/3) |
| 289 | 342 | Slightly gravelly (gran.-sm. peb.) sand (vf-vc) w/ minor clay; light yellowish brown (2.5Y 6/3) |
| 342 | 360 | Clayey silty sandy (vf-vc) gravel (gran.-med. peb.); olive gray (5Y 5/2) |
| 360 | 480 | Slightly gravelly (gran.-v. lg. peb.) clayey silty sand (vf-vc); light olive brown (2.5Y 5/3) |
| 480 | 513 | Sand (vf-vc) w/ trace gravel (gran.-sm. peb); yellowish brown (10YR 5/4) |
| 513 | 548 | Sandy (vf-m) silty clay; light olive brown (2.5Y 5/3) |
| 548 | 629 | Slightly gravelly (gran.-sm. peb.) clayey silty sand (vf-vc); light olive brown (2.5Y 5/3) |
| 629 | 661 | Gravelly (gran.-lg. peb.) sand (m-vc) w/ minor clay; light yellowish brown (2.5Y 6/3) |
| 661 | 675 | Clayey silt; gray (2.5Y 4/1) |
| 675 | 983 | Slightly gravelly (gran.-med. peb.) sand (vf-vc) w/ trace shell frag. (1-8 mm); light olive brown (2.5Y 5/3) |
| 983 | 1006 | Sandy (vf-m) clayey silt; dark gray (5Y 4/1) |
| 1006 | 1079 | Sand (vf-vc) w/ shell fragments (1-4 mm) and minor clay; grayish brown (2.5Y 5/2) |
| 1079 | 1342 | Sandy (vf-vc) silty clay w/ shell fragments (1-4 mm); very dark gray (5Y 3/1) |
| 1342 | 1350 | Sand (vf-vc) w/ minor clayey silt; gray (5Y 5/1) |
| 1350 | 1783 | Clayey silt w/ minor sand (vf-f); very dark gray (5Y 3/1) |
| 1783 | 1798 | Sand (vf-m); dark gray (5Y 4/1) |
| 1798 | 2108 | Clayey silt w/ minor sand (vf-m); very dark gray (5Y 3/1) |
| 2108 | 2118 | Silty gravelly (gran.) sand (vf-vc); very dark gray (5Y 3/1) |
| 2118 | 2136 | Clayey silt w/ minor sand (vf-vc); very dark gray (5Y 3/1) |
| 2136 | 2304 | Gravelly (gran.) sand (vf-vc) w/ minor clay; dark gray (5Y 4/1) |
| 2304 | 2540 | Silty sandy (vf-f) clay; light brownish gray (10YR 6/2) |
| 2540 | 2619 | Clayey silty sand (vf-m) ; light brownish gray (10YR 6/2) |
| 2619 | 2638 | Sand (vf-m) w/ minor clay; light brownish gray (10YR 6/2) |
| 2638 | 2657 | Silty clay; light brownish gray (10YR 6/2) |
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