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inspections of the waste oil AST secondary containment are performed through the 1" inspection port or 4" emergency vent using visual assessment or dip -stick testing to determine if the secondary containment has been breached. Daily visual inspections are also performed on the ancillary equipment of the AST including the aboveground piping, pumps and valves. Daily visual inspection procedures of the waste oil AST secondary containment and ancillary equipment provide a leak detection system that is designed to detect either failure of the primary or secondary containment structure or any release of hazardous waste or accumulation of liquid in the secondary containment generally within 24 hours, but periodically within 48 hours during holidays when the store may be closed. A copy of the Hazardous Waste Tank System Daily Inspection Log is provided as Attachment 4. 2.5 Description and Evaluation of Any Corrosion Protection Equipment, Devices or Material The tank has a coat of machinery enamel in fair condition. Scraped and worn surface coating appears typical for a tank of this age and is not a concern at this time. It should be noted that the tank walls were not visible at all sides, including the underside. 2.6 Description and Evaluation of any Spill Prevention or Overfill Equipment There is a float level gauge reading in inches of headspace and an Air Pump Co. Model #3500ALM Level Control Valve which acts to cut off the air supply to the pump if the product rises within 5" (reported value, not confirmed in the field) of the top of the tank. 2.7 Description and Evaluation of Secondary Containment for the Tank System Secondary containment must meet minimum standards as specified in subsections (j)(1) through 0)(3) of this section, including: (1) Tank system must have secondary containment capable of containing 100 percent of the contents of the tank and ancillary piping volume; and, (2) If the Tank system is exposed to precipitation, the secondary containment system must have sufficient capacity, in addition to that required in subsection 6)(1) of this section, to contain run-off and infiltration from a 25 -year, 24-hour rainfall event, (3) The Tank system secondary containment shall be provided with a leak detection system that is designed and operated so that it will detect either the failure of the primary and Above Ground Storage Tank Professional Engineer Certification Page 4