I'd use smaller drums like 35 Gallons. Quicker consumption rate. Another thought - is this your own property? If so, as you were... If you rent, better talk with the owner. I'd imagine your insurance company would have some "issues" or concerns as well. We store fuels, both diesel and gasoline, and there are required placards and notices for emergency services, as well as permits and insurance. I don't mean to preach - but be careful.