Just make SURE the ground is NOT wet; pools literally float up out of saturated ground.

That's probably not an issue in San Diego, but still . . .

(Embarrassment: it could be worse. I've still never published the story of how I turned a 300,000 pool DARK purple while it was full of swimmers -- testing a new idea that turned out to be a really, really bad one! It's been years, but still is uncomfortable to recall!)