FACILITY FAILED TO HAVE OVERFILL ON THEIR 2 DIESEL TANKS. BALLFLOATS WERE INSTALLED ON THE TANKS, BUT THESE WERE REMOVEED IN 10/09, AND NEW OVERFILL WASN'T INSTALLED UNTIL 5/10. ALSO, FACILITY FAILED TO CONDUCT TANK RELEASE DETECTION ON TANK #9 (ONE OF THEIR 12,000G DIESEL TANKS) FOR 4 MONTHS. A REVIEW OF RECORDS SHOWED THAT DURING THOSE MONTHS THE PROBE WAS OUT OF THE TANK, AND THE FACILITY WAS NOT UTILIZING A BACKUP METHOD OF RELEASE DETECTION.