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I reckon the settling pond is the square thing at

36 59 15.23 W
121 32 07.07 N

(There are smaller aeration ponds just south of it.)

Hollister (K3O7) is at:
36 53 28.08 N
121 24 29.24 W

The pond is about 5 miles from the departure end of Runway 31, just to
the left of the runway heading.

Don