Station No.: 323915117055301-5 017S002W33D001-5S   Agency: USGS

LOCATION.--Lat 32°39'15.97", long 117°05'53.62" referenced to North American Datum of 1983, San Diego County, CA, Hydrologic Unit is unknown, southwest corner of fenced, empty lot at 3303 National City Blvd, National City.

ROAD LOG.--From the Poway Field Office:

1: Start out going NORTH on TECH CENTER DR toward SCRIPPS POWAY PKWY. 0.1 miles

2: Turn LEFT onto SCRIPPS POWAY PKWY. 4.4 miles 3: SCRIPPS POWAY PKWY becomes MERCY RD. <0.1 miles

4: Merge onto I-15 S via the ramp on the LEFT. 11.2 miles

5: I-15 S becomes CA-15 S. 2.6 miles

6: Merge onto I-805 S. 6.0 miles

7: Merge onto CA-54 W. 1.6 miles

8: Take the NATIONAL CITY BLVD exit toward BROADWAY. 0.1 miles

9: Turn RIGHT onto NATIONAL CITY BLVD. <0.1 miles

10: End at 3303 National City Blvd National City, CA 91950. 

Well cluster is located in Southwest corner of fenced, empty lot at 3303 National City Blvd, National City, CA 91950. Drive-in access is possible through gate at Northwest corner of empty lot (2640 lock on gate). Walk-in access is possible by parking on paved drive to "Swap Meet" entrance, stepping over metal guard rail and walking down slope to vault.

ESTABLISHMENT AND HISTORY.--This cluster well site was established as a continuous monitoring site by the U.S. Geological Survey in November 29, 2005.

GAGE.--Instrumentation consists of a Design Analysis H500XL data logger transmitting through a Design Analysis SE-300 GOES HDR transmitter (DCP), five Insitu model Level Troll 500 non-vented pressure transducers, and one Insitu model Baro Troll 500 barometer. A rechargeable 12-volt battery and solar panel provides power. Instruments are housed in a subterranean concrete and steel vault (with a USGS 2640 lock).

Altitude of gage is 16ft, from topographic map. 

WELL CHARACTERISTICS.--Due to tidal influcences, some wells in this cluster may have brackish water. In order to obtain an accurate reading, the sensitivity knob on the electic tape must be set more towards "low".

ACCURACY.--Records are rated good to excellent, provided the sensor/cable assemblies do not slip.

COOPERATION.--This station is operated under cooperative agreement with the Sweetwater Authority. 

EQUIPMENT.--Instrumentation consists of a Design Analysis H500XL data logger transmitting through a Design Analysis SE-300 GOES HDR transmitter (DCP), five Insitu model Level Troll 500 non-vented pressure transducers, and one Insitu model Baro Troll 500 barometer. A rechargeable 12-volt battery and solar panel provides power. Instruments are housed in a subterranean concrete and steel vault (with a USGS 2640 lock).

Altitude of gage is 16ft, from topographic map. 

WATER LEVEL RECORD.--This cluster well site was established as a continuous monitoring site by the U.S. Geological Survey in November 29, 2005. The 2009 Water Year record is complete and usable for all wells in this cluster except for the following periods: 

Well #1: Feb. 1-26 and March 3-26. Data missing due to probe and recorder failures. Well #2: Feb. 1-26 and March 4-26. Data missing due to probe and recorder failures. Well #3: Feb. 1-26, March 4 and March 6-26. Data missing due to probe and recorder failures. Well #4: Feb. 1-26, March 3 and March 6-26. Data missing due to probe and recorder failures. Well #5: Feb. 1-26 and March 6-26. Data missing due to probe and recorder failures.

WATER LEVEL CORRECTIONS.--Corrections to recorded water levels were applied throughout the year. Ten manual water level measurements were made during WY 2009. These benchmark measurements, generally made monthly, provided a reference water level for correcting recorded data. Generally, corrections were prorated from measurement to measurement, except where noted. 

The variations in corrections from measurement to measurement may be due to (1) frequent and rapid fluctuations in water level during manual measurements of water level (observed by the technician), and (2) movement of the cable/sensor assembly during measurements and inspections. Final daily values are reported as depth below land surface datum (ft), daily instantaneous observation at 1200 hrs (statistical code 31200). 

DATUM.--Land-surface datum is 23.66 ft above North American Vertical Datum of 1988. Measuring point: MEASURINGPOINT. 

PERIOD OF RECORD.--Water year 2006 to current year.
PERIOD OF DAILY RECORD.--November 2005 to current year.