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USGS Water-Year Summary 2024
324116117050801 017S002W16Q009S, El Toyon Park Cluster Well near National City, CA
California Coastal Basin aquifers
LOCATION - Lat 32°41'16.06", long 117°05'08.15" referenced to North American Datum of 1983, in sec.00, T.17 S., R.2 W., San Diego County, CA, Hydrologic Unit 18070304, along North edge of park near curb, directly across the street from 2305 East 1st Street, National City.
REVISIONS HISTORY -
(1) Discrete water-level readings for NAVD88 and NGVD29 values were updated due to an incorrect offset that was originally applied. The changes were made to the values from the start of the record through May 18, 2021. (2) The Land Surface Datum (LSD) of 109.36 ft was set as of 12/29/2022. However, for the purpose of consistency with Local Assumed Datum (LAD) for other wells in the vault, this change in datum is now effective as 06/17/2024.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 1,300 ft. Upper casing diameter 1.94 in; top of first opening 1,260 ft, bottom of last opening 1,300 ft.
DATUM - Land-surface datum is 109.36 ft above North American Vertical Datum of 1988. Measuring point: TOP OF PVC, 0.84 ft below land-surface datum, Jul. 15, 2003 to Oct. 16, 2005; Top of 2 inch PVC casing, black mark on west side (below LSD), 0.79 ft below land-surface datum, Oct. 15, 2005 to present; Top of concrete vault (above LSD), 0.6 ft above land-surface datum, Oct. 15, 2005 to May. 6, 2020. Prior to 06/17/2024, the Local Assumed Datum (LAD) was 109.21 ft above the North American Vertical Datum of 1988.
PERIOD OF RECORD - Water year 2003 to current year.
GAGE - Electronic data logger and pressure sensor.
REMARKS - Sudden water-level changes may be attributed to nearby anthropogenic effects such as pumping and sampling. El Toyon Park Cluster Wells consist of five continuous record groundwater wells, located in a common ground-level vault.
PERIOD OF DAILY RECORD - December 2005 to current year.
EXTREMES FOR PERIOD OF RECORD - Highest daily maximum water level recorded, 4.41 ft NAVD 88, Feb. 28, 2008; lowest daily minimum water level recorded, -7.67 ft NAVD 88, Aug. 15, 2023.
