Bob Moore writes:

I can assure you that the runway is MUCH more substantial than
that. In the mid-80s. I was employed by the previous owner of
the development, Arthur Jones, inventor and manufacturer of the
Nautalis line of exercise equipment. He owned three B-707s which
we flew from that runway before it was lengthened to its present
length.

AirNav says this:

Surface: asphalt, in poor condition

FIRST 1800 FT OF RY 18 DETERIORATING WITH POT HOLES AND SEVERE
CRACKING.
1 ASPHALT SURFACE IS ONLY 2 INCHES THICK. PAVEMENT STRUCTURE CAN ONLY
SUPPORT LIGHT LOAD SINGLE WHEEL ACFT. HEAVIER ACFT MAY CAUSE IMMEDIATE
STRUCTUAL DAMAGE TO THE DETERIORATED SURFACE AND MAY GENERATE FOD.
RY 18/36 NOT CROWNED OR GRVD CAUSING STANDING WATER DURING AND AFTER
RAIN.

From this I inferred that the entire runway was just a thin layer of
asphalt.

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