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5 . 4 Spill History To the best knowledge of the Facility personnel, the Facility has not experienced a reportable discharge as defined by Federal or State laws since the hot plant and rock plant were erected in 2009 . Federal rules define reportable spills as any discharge more than 1, 000 gallons in a single discharge, or more than 42 gallons of oil in each of two discharges within a 12 - month period . Additional reporting requirements may be applicable from state and local agencies . ( Example : Reportable spills, as defined in California , include any single spill of 42 gallons or more . ) In the future, if the Facility has a reportable spill event, a written description of the spill , corrective action taken and plans for preventing recurrences will be documented using the Spill Report Form found in Appendix F . Appropriate individuals and agencies will be notified . 5 . 5 Spill Prediction Ref: 40 CFR 112 .7( b) Experience indicates a reasonable potential for equipment failure, such as loading or unloading equipment, tank overflow, rupture , or leakage . Potential spill scenarios with a prediction of the direction , rate of flow, and total quantity of oil that could be discharged as a result of major equipment failure are outlined in Appendix D . Additionally, potential spill scenarios are outlined for the four (4 ) main oil storage locations below . Materials generated during spill response activities will be properly disposed of as described in section 5 . 7 . Area A — Hot Plant Area A maintains a concrete secondary containment structure 24 inches in height surrounding three ( 3 ) 30,000-gallon hot asphalt oil tanks, one ( 1 ) 1,000-gallon asphalt oil calibration tank, a 200-gallon heating oil tank, and miscellaneous 55-gallon drums . The tanks and drums in this area could leak due to tank/drum rupture, tank/drum failure (from a catastrophic event ) , a hose or fitting rupture during filling operations, corrosion or holes in a tank/drum, or overfill of a tank/drum . The concrete secondary containment structure is fitted with one ( 1 ) sump in the northeast corner and is designed to hold the capacity of the largest tank . The interstitial space between the primary and secondary walls of the three ( 3 ) 30, 000-gallon asphalt oil tanks is piped to a dirt bermed area on the east side of the secondary containment structure . The berms will be maintained in order to hold the asphalt until it solidifies . The liquid asphalt oil ( PG grade ) , which is a thermoplastic material and must be heated to approximately 3000 F in order to flow, will solidify at ambient temperature and pressure, and will not flow . Area D — Rock Plant Area D consists of several 55 -gallon drums of miscellaneous oils located within three ( 3 ) concrete secondary containment structures . Drums in this area could leak due to rupture , failure ( from a catastrophic event ), a hose or fitting rupture during filling operations, corrosion or holes in a drum, or overfill of a drum . The secondary containment structures are designed to hold the capacity of several drums, and spill kits are maintained near the secondary containment structures . Spills that may occur outside the secondary containment structures would likely remain within the vicinity of the containment structures . Area E — Equipment Maintenance Area Area E consists of a 500-gallon double -walled diesel tank situated on a trailer, a mobile fuel/ lube transfer truck, a 10, 000-gallon double -walled diesel tank situated in a vault, a 500-gallon used oil single-walled tank, an empty 4, 000-gallon diesel tank and an empty 10, 000-gallon diesel tank . The tanks could leak due to tank rupture, tank failure (from a catastrophic event) , a hose or fitting rupture during filling operations, or overfill of the tank . Spills from the 500-gallon double-walled diesel tank, 10, 000-gallon double -walled diesel tank that may occur would likely remain within the vicinity of the tank . 18