San Diego Hydrogeology
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) |
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