With the Fourth of July holiday just a week away, fire officials are reminding people once again to be safe if they choose to use fireworks.  Mid-Columbia Fire and Rescue Chief Bob Palmer says people need to make sure the fireworks are legal and used in a proper location, away from dry grass or any vegetation that could readily burn.  Oregon law prohibits any firework that explodes, flies into the air, or travels more than six feet on the ground or 12 inches into the air.  People who start a fire with illegal fireworks, or use legal fireworks in a negligent manner, are liable for the cost of extinguishing the fire.  Palmer also reminds parents to supervise their children when they use fireworks.