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

San Elijo - SDSE (13S/4W-26Q1-3)

Lithologic Summary

Land-surface elevation is 32 feet above NAVD88. Depth is in feet below land surface. Drilled by U.S. Geological Survey using hydraulic rotary, November 17, 2012. Total depth drilled 1190 feet. Screened intervals: 780-1120, 600-760, 380-580, 300-360, 100-110, and 40-50 feet.

Depth (ft) Description
From To
0 26 Gravelly (gran.-lg. peb.) clayey sand (vf-vc); fill; Pale Yellow (5Y 7/3)
26 76 Silty sand (vf-m) w/ min. clay & abunt. shells; D. Gray (5Y 4/4)
76 103 Slightly gravelly (gran.- v. lg. peb.) sand (f-vc); oxidized; Brown (10YR 4/3)
103 121 Slightly gravelly (gran.-sm. peb.) sand (f-vc); Pale Yellow (5Y 7/3)
121 184 Sandy (vf-m) clay; Olive Gray (5Y 5/2)
184 187 Gravelly (gran.-med. peb.) sand (f-vc); Olive Gray (5Y 5/2)
187 196 Clayey sand (vf-c); Olive Gray (5Y 5/2)
196 250 Clay w/ min. sand (vf-c); Light Olive Gray (5Y 6/2)
250 295 Clayey sand (vf-vc) w/trave gravel (gran.-lg. peb.); D. Gray (5Y 4/1)
295 362 Clayey silt; well indurated (ind.), fissile; D. Gray (5Y 4/1)
362 366 Slightly grav. (grab.-v. lg. peb.) sandy (vf-vc) clayey silt; well ind.; D. Gray (5Y 4/1)
366 612 Clayey silt; well ind., fissile; D. Gray (5Y 4/1)
612 635 Sand (f-vc) w/ trace shells; well ind.; D. Gray (5Y 4/1)
635 678 Clayey silty sand (vf-m) w/ shells and calcite; well ind.; D. Gray (5Y 4/1)
678 729 Silty sand (vf-vc) w/ trace shells; well ind., siliceously cemented; D. Gray (5Y 4/1)
729 805 Slightly grav. (gran.-md. peb.) sandy (vf-c) silty clay w/ trace shells; well ind.; D. Gray (5Y 4/1)
805 843 Slightly grav. (gran.-md.peb) sand (vf-vc) w/ shale frag. & min. shells, well ind.; D. Gray (5Y 4/1)
843 846 Silt w/ min. sand (vf-vc); well ind., fissile; V. D. Gray (5Y 3/1)
846 850 Slightly grav. (gran.-md.peb) sand (vf-vc) w/ shale frag. & min. shells; well ind.; D. Gray (5Y 4/1)
850 852 Silt w/ min. sand (vf-vc); well ind., fissile; V. D. Gray (5Y 3/1)
852 900 Slightly grav. (gran.-md.peb) clayey sand (vf-vc) w/ shale frag. & trace shells; well ind.; D. Gray (5Y 4/1)
900 927 Sand (vf-vc) w/ shale frag & trace shells; well ind.; D. Gray (5Y 4/1)
927 960 Slightly grav. (gran.-sm.peb) sand (vf-vc) w/ shale frag. & trace shells; well ind.; D. Gray (5Y 4/1)
960 963 Clayey sand (vf-vc) w/ min. shell frag, well ind.; D. Gray (5Y 4/1)
963 979 Sand (vf-vc) w/ shale frag. & min. shells; well ind.; D. Gray (5Y 4/1)
979 1045 Gravelly (gran.-v. lg. peb) sand (vf-vc) w/ min. shells; well ind.; D. Gray (5Y 4/1)
1045 1080 Slightly grav. (gran.-md. peb.) sand (f-vc) w/ min. shells & oxidized shale frag.; well ind.; D. Gray (5Y 4/1)
1080 1104 Sand (f-vc) w/ trace gravel (gran.-sm. peb.), shale frag. & shells; well ind.; D. Gray (5Y 4/1)
1104 1109 Silt; v. hard. well ind., fissile; V. D. Gray (5Y 3/1)
1109 1190 Sand (f-vc) w/ trace gravel (gran.-sm. peb.), shale frag.  & shells; v. hard, well ind.; D. Gray (5Y 4/1)