I have a pocket gopher making mounds of dirt in my front yard next to my mail box! It's killing my grass and pissing me off. I shovel and rake off the dirt to prevent more of my lawn dieing and not an hour later he's right back at it. So I start over and stand guard hoping to catch a glimpse of him with my pitch fork in-hand and he doesn't show up until I leave! I tried to flood out his holes with the hose, light fire works down his tunnels, and spear the ground with a pitch fork. NO DICE! How do I get rid of this sneaky pest?