STATION.--395342075102101 PHILADELPHIA COUNTY, local well number PH12
LOCATION.--Lat 39`53'42", long 75`10'21", Hydrologic Unit 02040202, at Barracks and East Fourth Streets, Philadelphia.
OWNER.--U.S. Naval Base.
AQUIFER.--Middle Sand Unit of Potomac-Raritan-Magothy aquifer system of Late Cretaceous age.
WELL CHARACTERISTICS.--Drilled observation artesian well, diameter 8 in., depth 101 ft, cased to 93 ft, screened from 93-101 ft.
INSTRUMENTATION.--Data collection platform with 60-minute recording interval. Satellite telemetry at station.
DATUM.--Elevation of land surface is 8.6 ft above sea level. Measuring point: Top of casing, 1.8 ft above land-surface datum; 3.3 ft above land-surface datum since May 27, 1998.
REMARKS.--Daily maximum, minimum, and mean water levels since October 1994 are available from the District Office. Mean daily fluctuation caused by tidal loading, 0.20 ft.
PERIOD OF RECORD.--January 1952 to current year.
COOPERATION.--Funding for the operation of this station is provided by the Pennsylvania Department of Environmental Protection and the U.S. Geological Survey.