COMPLIANCE INFO_PRE 2019 - Laserfiche WebLink

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001, the Professional Engineer that stamped/certified this Plan has determined that ce atn tanks and containers at the Facility are eligible for use of alternate, environmentally equivalent, methods of assessing tank condition and suitability for continued service. Due to the number of bulk storage containers at the Facility, the Professional Engineer grouped them into categories with similar inspection and integrity testing requirements: • Category A - Portable containers with all sides visible. For these containers, monthly external visual inspections provide equivalent environmental protection. • Category B - Single -walled aboveground storage tanks (ASTs) with all sides visible or double -walled tanks with accessible monitoring ports. For these ASTs, monthly external visual inspections provide equivalent environmental protection. • Category C - Single -walled aboveground storage tanks (ASTs) without all sides visible. These ASTs require monthly external visual inspections PLUS a formal external inspection and a leak test every 10 years. • Category D - Hazardous waste AST requires monthly inspections PLUS formal external/internal inspection and leak test every 5 years per California Hazardous Waste Regulations. The following bulk oil containers are in Category A: 55 -gallon drums and totes and the 90 - gallon Vicogen oil container which are portable. The following bulk oil containers are in Category B: two 180 -gallon diesel fuel fire water ASTs, one 24 --gallon diesel fuel fire water AST, and the two Biosol mixing tanks. The following bulk oil containers are in Category C: 1,000 -gallon diesel fuel AST and three emergency generator diesel fuel ASTs (140, 195 and 195 gallons each). The following bulk oil containers are in Category D: the two (2) 1,000 -gallon salvage/used oil ASTs. These tanks are double walled tanks which satisfy the secondary containment requirements for 40 CFR 112.8(c)(2). For each Category A and B container, the container's physical configuration, combined with periodic inspections, ensures that a small leak that could develop in the tank shell will be detected before it can become significant, escape secondary containment, and discharge offsite. This approach provides environmental protection equivalent to the non-destructive shell evaluation component of integrity testing required under 40 CFR 112.8(c)(6) since it provides an appropriate and effective means of assessing the condition of the tank and its suitability for continued use. For Category C and D tanks, periodic inspections will be supplemented with a formal external inspection by a certified inspector and a leak test every 10 years (every 5 years for the hazardous waste salvage/used oil tanks). Leak testing may include pressure testing, vacuum testing, ultrasonic thickness testing, hydrostatic testing, or some other method or combination of methods, as determined by the certified inspector. 32 gust 20 i 6 C ,