According to the Advance Termite Inspection Cartridge label, if termite activity appears to be high, stations may be inspected more often than 90 days and the bait replaced as needed.
The Advance Termite Bait Station should be placed 2-4 feet away from the foundation, but not directly under the drip line from the roof of the structure. If there is tile or concrete in this area we recommend using a core drill as it should only take a few minutes per hole and also leaves a perfectly smooth, round hole and will also go through rebar as well.
Advance Termite Bait Stations should be placed 2-4 feet away from the foundation. They should be spaced 10-15 feet away from each other.
After baiting for the Advance Termite Bait System Kit you want to monitor every 90 days to see if termite activity has stopped. Once the activity has stopped then you can replace the wood base and insepction cartridge every 12 months.
We would not recommend using the termite bait stations due to the fact that you have a crawlspace and are on piers. To make sure you prevent termites you want to use a liquid Termiticide like Termidor. Please review our article Barrier and Soil Treatment.
Foundational walls and piers can be treated with a termiticide (Termidor SC) at the soil level: