Similar to your gas station concept, car dealerships typically have underground storage tanks and often the same type of oil changing stations; some even have underground garages for storing their vehicles. Underground construction at one of these sites could conceivably cover the installation of a bolthole.
For caches, there's also Jiffy Lube, with multiple locations in all 50 States and IIRC they typically utilize the same construction team, at least regionally.
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