JANUARY 31 2003
APPENDIX A PART 3
INSTRUCTIONS FOR COMPLETING AIR FORCE FORM 1686
1. Entries on AF Form 1686 will be made biannually, or more
often if required by the parent command.
2. No readings of the structure to soil potentials are to taken
where the ground is frozen.
Readings are to be made with the authorized meters only.
Item 1. Installations. Enter the official name and location of
the installation as: MARCH AFB, CA. Do not abbreviate or use
Item 2. Year.
Enter the calendar year.
Item 3. Protected Structure. Enter the name of the protected
structure and its number as shown on USAF Real Property Report
(RCS: HAF - PRE(SA)7115) such as "Underground Gas Pipeline
Capehart Hsg Nr 220."
Item 4. Test Station Number. Enter the number of the test
station where the reading of the potential is to be taken. Test
stations should be numbered consecutively starting with number 1
for the entire base.
Item 5. System Data:
A. Number of Anodes. From record, find the number of
existing anodes on this system and enter it on the form. Also,
note under remarks on back of form if any new anodes were
installed during the last year and how many.
B. Number of Test Stations. Enter here the total number
of test stations for this piping system. List the test stations
Item 6. Anode Data:
A. Type. Enter the name of the anode, trade name, its
manufacturer, and the name of the material, as
1" or "zinc."
B. Size. Enter the dimensions or the standard size
designations as "2" by 5' long" or "17 lb," or "32 lb."
C. Type of Backfill. Enter the type of backfill used
around the anodes as "prepackaged," "bentonite," "coke breeze,"
D. Location Description. Enter a brief description of