Blasting company? As in TNT, trinitrotoluene, dynamite, C-4, etc.? As in building demolition? Mining? Your problem is easy, then. Some night, just sit out where they can see you, and have a couple road flares next to you like you're working on them... Or better yet, go get some modeling clay and make it up to look like a charge. If they ask what you are doing, point at your car and tell them you're telecommuting.
DISCLAIMER: Of course don't actually do this. It would be funny to see the looks on their faces, but I don't want you to get in any trouble, or lose your job over this.
