Site Description for Boundary Waters (19S/2W-2C7-11)

LOCATION: Latitude 32º 33' 13", longitude -117º 03' 39" (NAD27) in San Diego County, California. Wells are located 200 feet east of 2223 Dairy Mart Road, 1/2 mile south of Interstate Highway 5 in San Ysidro, California.

SITE INFORMATION: Land-surface altitude is 35 feet (NGVD29) above mean sea level from 24000 scale topographic map.

INSTRUMENTATION: None.

WATER-LEVEL RECORD: The period of record for intermittent and daily water-level measurements is listed below.

State well number	USGS station number	Intermittent water-level	Daily water-level
19S/2W-2C7	323313117033901	07/17/1995 to present	no data
19S/2W-2C8	323313117033902	07/17/1995 to present	no data
19S/2W-2C9	323313117033903	07/17/1995 to present	no data
19S/2W-2C10	323313117033904	07/17/1995 to present	no data
19S/2W-2C11	323313117033905	07/17/1995 to present	no data

WATER-LEVEL MEASUREMENTS: Water levels are measured manually by means of a calibrated electric tape. Electric tape is used to avoid entangling the sensor and cable. Correction factors (comparison to a steel tape) are applied when necessary. Water-level corrections, for example to compensate for gage height, are calculated after each measurement and applied to the recorded values. Daily values are reported as the measurement at 1200 hours in feet below land surface.

MEASURING POINT: Top of steel box.

TOPOGRAPHIC MAP: USGS Imperial Beach, California, 7.5 minute series.

COOPERATION: The station is operated under cooperative agreement with the Tijuana County Water District.

State well number	USGS station number	Hole depth (ft)	Perforation depth (ft)	Casing size and type	Date drilled
19S/2W-2C7	323313117033901	1430	1340-1360	2" PVC	6/13/95
19S/2W-2C8	323313117033902	1430	1170-1190	2" PVC	6/13/95
19S/2W-2C9	323313117033903	1430	945-965	2" PVC	6/13/95
19S/2W-2C10	323313117033904	1430	580-600	2" PVC	6/13/95
19S/2W-2C11	323313117033905	1430	260-280	2" PVC	6/13/95

ROAD LOG: Key intersection is the intersection of Interstate Highway 5 and Dairy Mart Road, approximately 1 mile northwest of the town of San Ysidro. Directions given are from Interstate 5 North.

Mileage	Description
0.0	Exit at Dairy Mart Road. Turn left (south) onto Dairy Mart Road and drive 0.5 miles to 2223 Dairy Mart Road.
0.5	Turn left (east) into 2223 Dairy Mart Road.
0.6	Well site is 200 yards from the street.

San Diego Hydrogeology

Site Description for Boundary Waters (19S/2W-2C7-11)