Spring 1999 NOC contact drill

Wed Apr 14 23:11:23 UTC 1999

> 
> 
> 
> Sounds like there is a need for increased use of highly accurate positioning
> systems.

Tain't that easy. The SOP is to use the copper wire buried with
the [fiber, sewer, etc] and excite it with 38 Khz; then sniff for
it.

But the LF signal can and does couple to OTHER conductors in the
area, confusing everything. Often the only sure way is to hand dig
down to what you think is there.... c a r e f u l l y....

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