ON OR ABOUT JUNE 20, 1997, A CONOCO PIPELINE COMPANY MON- ITORING STATION DETECTED A PRESSURE DROP IN CONOCO'S SEMI- NOLE PIPELINE IN SOUTHERN MONTANA. A RELEASE, REPORTEDLY OF UP TO 1800 BARRELS OF UNLEADED GASOLINE, WAS DISCOVERED ON JUNE 21, 1997 ON RANCH LAND ON THE CROW RESERVATION NEAR LODGEGRASS, MT. GASOLINE FLOWED APPROXIMATELY FOUR MILES FROM THE SPILL SITE, IMPACTING BEAR CREEK, WHICH IS A TRIB- UTARY TO THE LITTLE BIG HORN RIVER.