|
 |
 |
 |
 |
 |
 |
 |
|
 |
|
|
|
Well-Numbering System
|
|
|
|
 |
|
|
|
Wells are identified and numbered according to their location in the rectangular system for the subdivision of public lands. The identification consists of the township number, north or south; the range number,
east or west; and the section number. Each section is further divided into sixteen 40-acre tracts lettered consecutively (except I and O), beginning with 'A' in the northeast corner of the section and progressing in
a sinusoidal manner to 'R' in the southeast corner. Within the 40-acre tracts, wells are sequentially numbered in the order they are inventoried. The final letter refers to the base line and meridian. In California,
there are three base lines and meridians; Humboldt (H), Mount Diablo (M), and San Bernardino (S). All wells in the study area are referenced to the San Bernardino base line and meridian (S). Well numbers consist of
15 characters and follow the format 001N005E36G001S. In this report, well numbers are abbreviated and written 1N/5E-36G1. Wells in the same township and range are referred to only by their section designation, 36G1.
Sites with more than one well are shown as hyphenated numbers. In this case
wells 36G1, 36G2, 36G3, and 36G4 are shown as 36G1-4 on location maps. The diagram below shows how the number for well 1N/5E-36G1-4 is derived. In addition to the Well ID, the USGS assigns a station identification number (Station ID) to each well. The 15-digit station identification number is used as an internal control number within the USGS data base. Although the Station ID is assigned using the latitude and longitude believed to be the location of the site when inventoried, prior to development of quick and accurate methods for determining latitude and longitude (such as global positioning satellites, GPS), these numbers may have been in error; sometimes significantly (especially in open desert areas, for example). However the number is unique within the USGS, and is the primary reference used to store information about a well. As better information about a well and its location become available, the latitude, longitude, or Well ID may change, but the Station ID for that well will not change. Therefore, this number should not be used to locate a well. When requesting further information about wells listed in the data base, please include the Station ID for each well.
|
|
|
 |
|
|
|
 |
|
|
|
Station-Identification Number
|
|
|
|
 |
|
|
|
The USGS assigns a station-identification number (Station ID) to each well. The 15-digit station identification number is used as an internal control number within the USGS database. Although the Station ID is
formed initially from the latitude and longitude believed to be the location of the site, the number is a unique number used by the USGS to store information about a well. This number should not be used to locate a
well. As better information about a well and its location become available the latitude, longitude, or Well ID may change, but the Station ID for that well will not change. When requesting further information about
wells listed in the database please include the Station ID for each well.
|
|
|
 |
|
|