PROGRAMS AND PLANS - Observation Well Location Maps


               UNITED STATES DEPARTMENT OF THE INTERIOR
                          GEOLOGICAL SURVEY
                      WATER RESOURCES DIVISION
                         WASHINGTON 25, D. C.

                                                  April 7, 1964
                                                 Code 4056 0001

GROUND WATER BRANCH MEMORANDUM NO. 64.28

To:       District Chiefs and Staff Officials

From:     Chief, Ground Water Branch

Subject:  PROGRAMS AND PLANS - Observation Well Location Maps

We anticipate that we will be called on, in the near future, to
supply a map of the United States showing the location of wells in
which periodic water-level measurements are made.  We are
requesting, therefore, that each District furnish a map, scale
1:5,000,000, if possible, showing the District observation wells.
All wells which are measured at least once a year should be
included.  Wells measured as part of a specific project and in
which measurements will not be continued following the termination
of the project, should not be included.  We are also interested in
the location of wells from which water samples are obtained
periodically.  The following symbols and colors should be used:

     0 (red)            observation well, tape measurement
     0 (green)          observation well, recorder
     X (black)          quality observation well, periodic
                        sampling

The X should be superimposed over the other symbols if the well is
dual purpose.  If an area contains too many wells to show by
individual symbols, the appropriate symbol should be used with the
number beside it, as:

       (red)
     2X  0  45

     (green)
         0  6

However, we will need individual locations whenever possible.

In addition, please indicate the number of wells measured by the
State organization(s).  These would include wells not shown in the
above, but which are measured periodically by State cooperative
agencies.



                                   (s) J. T. Callahan
                                   for O. M. Hackett

WRD Distribution:  A, B3, S3, FO-L3