06/19/92: THE ADMINISTRATIVE ORDER ON CONSENT FOR REMOVAL ACTION WAS ISSUED ON 11/05/91. A SUBSEQUENT ADMINISTRATIVE ORDER ON CONSENT WAS ISSUED 12/02/91 AGAINST LARRY'S POST & TREATING COMPANY/SITE M5. LPC IS LOCATED APPROXIMATELY TWO AND ONE-HALF MILES FROM COLUMBIA FALLS, MONTANA, IN COLUMBIA HEIGHTS, MONTANA, ON HIGHWAY 206, ONE HALF MILE FROM THE INTERSECTION OF HIGHWAY 40. LPC IS AN OPERATING WOOD TREATING FACILITY WHICH HAS BEEN TREATING WOOD WITH PENTACHLOROPHENOL (PCP) FOR APPROXIMATELY NINE MONTHS OF EACH YEAR SINCE 1973. THE WOOD TREATMENT OPERATION CONSISTS OF DIPPING POSTS AND POLES IN VATS (DIP TANKS) OF 3-5% PCP IN A SOLUTION WITH CARRIER OIL. ONCE THE WOOD IS SATURATED, THE POLES ARE REMOVED AND ALLOWED TO DRIP. THE LACK OF WASTE CONTAINMENT MEASURES AT THE SITE HAS RESULTED IN SIGNIFICANT PCP CONTAMINATION IN THE SOIL AROUND THE DIP TANKS AND POLE DRYING AREAS, AND LOW-LEVEL DIOXIN CONTAMINA- TION IN THE AREA OF THE DIP TANKS. THE TREATING AREAS ARE STAINED, AND AFTER HEAVY RAINS, SHEENS CAN BE OBSERVED IN STANDING WATER AT THE SITE.