Got any insurance? A job like that will require public liability insurance and BASC,SGC,CLA insurance etc will most likely not cover you for this job. I'm guessing you've never trapped a mole before, nevermind on a golf course with the pressure to get them gone and the traps that will go missing and need replaced etc etc etc. Save the headache and call in someone who knows what they are doing. Stay away from gas, one wrong move and it's goodnight, theres no antidote for a lungful of gas.