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5.0 DISCHARGE OR DRAINAGE CONTROLS — §112.7(a)(3)(M) All of the oil storage areas and loading and unloading areas have secondary containment. Therefore, the site wide drainage at the facility does not need to be contained beyond what is provided or will be provided by secondary containment. Storm water discharges are not treated at the facility. The surface water runoff at the Terminal is primarily across the parking area surface away from the Terminal buildings to a storm sewer system and in some areas is directly into storm water drainage ditches. The storm sewers then flow to the northwest side of the site to the facility's drainage ditches which eventually empty into the city storm water drainage system. Figure 1 shows the drainage patterns at the Terminal. The flooding potential at this facility is low. Spill Control Points#1,#2,#3,#4,#5,and#6 Adjacent to the unloading area or tank area, there are two catch basins to intercept large releases of petroleum product,indicated as Spill Control Point#1 (SCP-1) and Spill Control Point#2(SCP-2). If fuel were released outside the delivery area,it would flow to one of these storm drains. From this point product would then flow toward Spill Control Point #3 (SCP-3) prior to flowing west to Spill Control Point #4 (SCP-4)and Spill Control Point#5 (SCP-5). It is at all of these locations(SCP-1,2,3,and 4)that the flow of diesel fuel could be intercepted and contained prior to ever moving to the storm water drainage ditch. The last location any surface release through the storm drainage system can be contained is Spill Control Point #6 (SCP-6). It is at this point that all releases to the storm sewer and/or drainage ditch will be contained prior to moving off-site to the city drainage system. Figure 1 details the routes and discharge points discussed above. STORAGE AND USAGE AREAS Bulk Tank Fuel Farm Secondary Containment Type and Capacity: There is a concrete retaining wall around the two 80,000 gallon ASTs at this location. It is approximately 150 feet by 50 feet and 5 feet high and can contain 120,000 gallons of the released contents even with the addition of two more tanks in the containment area. The bottom of the containment area is constructed of a four-inch thick concrete pad,a six-inch compacted stone base, and the existing clay sub-bed which was also compacted for construction purposes. Fuel is transferred from the tank fuel farm via two underground double wall pipes to the maintenance building. Tanker trucks filling the tanks would have a maximum capacity of 7,600 gallons. There are catch basins connected to an oil/water separator located at the unloading area. Spilled oil flows to a 4,000 gallon oil recovery tank from the oil/water separator while the underflow discharge flows into the 120,000 gallon tank containment area. Figure 2 details the route. All used oil recovery tanks and the oil/water separators are inspected for proper operation and are pumped out by a licensed industrial waste processor as necessary. Secondary Containment Drainage: The containment area at the fuel farm would accumulate storm water during precipitation events. Accumulated storm water must be inspected by authorized personnel for signs of oil contamination, such as a sheen or discoloration,before being drained from the diked area by way of the sump equipped with a normally closed manually operated drain valve in the southwest corner. If the water does not appear contaminated(petroleum odor and no floating petroleum or sheen),a valve is opened or a pump is activated and the water is allowed to drain. The containment area discharges to the storm sewer system within the property. After draining the water,the inspector verifies that the containment valve 18