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Overfill Buckets/Fill Locations: At the East end of the 10,000 gal. Diesel Fuel Tank where filling of the tank is conducted, there is a spill/fill container of approximately 10 gals. capacity. Filling operations connections are completely contained ' within this overfill containment box. At the filling point ip connection, which sits entirely within the containment box, it was noticed that there was approximately 4 gallons of product in the containment box. Normally, the containment box liquid would be pumped back into the system via the hand pump, but in this case, the product had apparently been in the box for some time, with fugitive dust being stirred up next to the tank in site operations, which would have severely contaminated the product in the containment box. It is required that this product currently in the containment box be _ removed and disposed of properly and that the containment box be cleaned. Oct. 15, 2019: The product sitting in this containment box has been properly removed from the containment box and the containment box has been cleaned. There appear to be no further required actions or corrections at this particular location of the tank. It is noted that the containment box should be part of regular visual inspections on this storage tank to prevent sitting product in this device container. This container is not generally locked, however the facility is secured when not operating. Beneath the fill/spill containment box, there is also a return opening for the hand pump- plunger in the interior of the overfill bucket thru which spilled or line residual fuel can be returned to the tank. Maintenance on the plunger needs to occur as part of the ongoing preventative maintenance program, and if necessary, be replaced. Also, at the time of the inspection, the overfill/fill location was unlocked and easily opened. This fill location should be padlocked when not in use,to avoid unauthorized opening, although the entire yard is secured. Vents: The Aboveground Storage Tank has a 2-inch CARB approved atmospheric vent which is in operating condition and is unobstructed. During the inspection, the vent cap was closely inspected to determine that there were no obstructions for vapor venting. The atmospheric vent is on the top of a 2 inch galvanized steel pipe and terminates approximately 8ft. above the top of the tank, which precludes atmospheric flammable congregating at the tops of the tank and creating an explosive or combustible condition. There is (1) inch emergency vents on the top of the tank, one for the primary vessel, and also an 8 inch emergency vent for the secondary containment area of the tank located at the middle of the top of the tank.. The emergency vent is a Morrison Bros. emergency vent. The one e-vent for the primary tank is attached to the bolted 28 inch man way. The e-vent for the secondary containment is welded to the outer shell of the tank and located near the center top of the tank. The emergency vent actuates at 2 1/2 psi. The emergency vent was inspected and tested and found to be in good working condition. The Morrison Bros emergency vent is sized to the volume of the AST for the AST. The atmospheric vent on the 2 inch pipe riser did not appear to have any obstructions to the outflow of vapors and are suitable for continued use.