Steve Arthur practically lives out of his truck these days.He runs one of Fresno's busiest well-drilling companies, and hustles up and down the highway to check on drilling rigs that run 24 hours a day."It's officially getting crazy," Arthur says. "We go and we go but it just seems like we can't go fast enough."Drilling in California isn't just for oil and gas — it's for water. And during this severe drought, farmers and ranchers are relying heavily on pumping groundwater. Counties in the farm-rich Central Valley are issuing record numbers of permits for new wells. But the drilling frenzy could threaten the state's shrinking underground aquifers.Arthur says he's lucky if he gets three hours of sleep a night.