San Diego Hydrogeology
Sweetwater - SDSW (17S/2W-28R4-9)
Lithologic Summary
Land-surface elevation is 17.40 feet above NAVD88. Depth is in feet below land surface. Drilled by U.S. Geological Survey using hydraulic rotary, August 12, 2009. Total depth drilled 2006 feet. Screened intervals: 1810-1850, 1300-1320, 960-980, 540-560, 170-190, and 45-65 feet.
Depth (ft) | Description | |
---|---|---|
From | To | |
0 | 28 | Gravelly sand, M-VC w/ granules; Lt yellowish brown (2.5Y (6/4) |
28 | 38 | Silty sand, VF; Olive brown (2.5Y 4/3) |
38 | 63 | Gravelly sand, M-VC sands w/ granules to medium pebbles; Yellowish brown (10YR 5/6) |
63 | 115 | Sandy clay, FV-M; Brownish yellow (10YR 6/6) |
115 | 154 | Sandy gravel, gran-med peb and M-VC; Lt yellowish brown (2.5Y 6/3) |
154 | 182 | Silty clay; Brown (10YR 4/3) |
182 | 278 | Sandy gravel, gran-med peb and M-VC; Lt. yellowish brown (2.5 6/3) |
278 | 296 | Clayey sand, M-VC; Dark yellowish brown (10YR 4/4) |
296 | 338 | Gravelly sand, F-VC and gran-sm peb; Lt yellowish brown (2.5Y 6/4) |
338 | 465 | Gravelly sand, M-VC and gran-med peb; Lt olive brown (2.5Y 5/3) |
465 | 580 | Slightly silty gravelly sand, VF-VC and gran; Lt yellowish brown (2.5Y 6/3) |
580 | 596 | Gravelly silty sand, VF-VC and gran; Olive (5Y 5/3) |
596 | 740 | Gravelly sand, VF-VC and gran-med peb; Grayish brown (2.5Y 5/2) |
740 | 880 | Clayey silt with shell fragments; Very dark gray (2.5Y 3/1) |
880 | 1,030 | Clayey silt; Very dark gray (2.5Y 3/1) |
1030 | 1,040 | Sand, VF-M with shell fragments; Very dark gray (2.5Y 3/1) |
1040 | 1,115 | Clayey silt; Very dark gray (2.5Y 3/1) |
1115 | 1,180 | Clayey silt with shell fragments; Very dark gray (2.5Y 3/1) |
1180 | 1,278 | Clayey silt; Very dark gray (2.5Y 3/1) |
1278 | 1,360 | Silty gravelly sand with some shell fragments; Very dark gray (2.5Y 3/1) |
1360 | 1,460 | Slightly gravelly silt/clay; Olive gray (5Y 5/2) |
1460 | 1,575 | Slightly sandy silty clay, F-C sand; Olive gray (5Y 5/2) |
1575 | 1,605 | Clayey/silty sand, F-C sand; Olive gray (5Y 5/2) |
1605 | 1,635 | Silty clay; Olive gray (5Y 5/2) |
1635 | 1,710 | Sand, M-VC; Olive gray (5Y 5/2) |
1710 | 1,785 | Gravelly sand; Olive gray (5Y 5/2) |
1785 | 1,850 | Sandy gravel, partially cemented, well compacted, cobbles; Dark grayish brown (10YR 4/2) |
1850 | 1,918 | Slightly silty sand, VF-C sand; Dark grayish brown (10YR 4/2) |
1918 | 1,962 | Sandy silt, VF-VC sand; Dark gray (2.5Y 4/1) |
1962 | 2,006 | Silty sand, M-VC sand (1962' to 1980'); VF sand (1980' to 2006'); Dark gray (2.5Y 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