[juanbenae]

Originally Posted by daepp

On a property I’m in escrow on in So Cal - curious if anyone recognizes any details.

looks like a asphalt tack oil tank. prior to AC being placed the existing surface being it aggregate base rock or an existing AC will be oiled to help adhesion. it is heated and sprayed from a pressurized hose with a wand on it. that'd be my take anyway.