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

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 March25, 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)