There's a Six-Thousand Dollar loss estimate as a result of a rather unusual theft incident, in northwestern Jefferson County.     State Police say that an estimated ten tri-axle truck loads of dirt were stolen from a location along Route 949, near Olean Road, in Heath Township.     And, this crime took place sometime between Ocotber 20th and January 29h.     The victim is Debra McMurdy of the Slippery Rock area.     Anyone, with any information on this matter, is asked to contact the State Police..