THIS IS A UST FIELD CITATION CASE. A CITATION WAS ISSUED FOR NOT CONDUCTING INVENTORY CONTROL LEAK DETECTION AT THE GUAM SANKO TRANSPORTATION COMPANY FACILITY BY A METHOD ADEQUATE TO DETECT A RELEASE. ONLY DURING MONTH OF THE INSPECTION (11/99) WERE THE CORRECT METHODS USED FOR THE FIRST TIME. MOBIL IS TANK OWNER AND FUEL SUPPLIER TO GUAM SANKO. THE MOBIL REPRESENTATIVE WHO WAS PRESENT AT THE INSPECTION ACCEPTED LIABILITY AND REQUESTED THAT THE FINE BE SENT TO MOBIL. GUAM SANKO CONTRACTS WITH MOBILE TO OPERATE THE TANKS TO FUEL THEIR TOURIST BUSES.