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15 February 2016 AdvancedGeo AGE Project No. 12-2181 Environmental Page 10 of 23 3.5. CONTAINMENT AND DIVERSIONARY STRUCTURES (40 CFR 112.7©) Methods of secondary containment at the Facility include a combination of structures (e.g., berm and built-in secondary containment) and land-based spill response (e.g., booms and absorbents) to prevent oil from reaching navigable waters or adjoining shorelines. 3.5.1. Spill Pallets Each spill pallet, if employed, has a minimum 100% containment capacity, which can effectively contain the volume of any single 55-gallon drum. Additionally, all drums are located within the maintenance shop. Concrete walls and flooring within the shop act as a tertiary secondary containment to the spill pallets. 3.5.2. Unloading Area The unloading area is slightly sloped to provide minimal containment from hose and connection leaks during unloading or fueling of Facility vehicles. 3.5.3. Transfer Areas Drip pans are placed under fill ports for all ASTs and used to catch leaks from the piping/hose connections. Buckets are used to catch spill or leaks from hose connections/transfers. Sorbent material is placed in spill cleanup kits, along with adsorbent booms and other portable barriers. The spill kits are located inside the storage building near 55-gallon drums storage and next to the ASTs (Figure 2). The spill kits are positioned for rapid deployment should a spill occur, such as spills associated with overfills or hose rupture from the fuel dispenser. The response equipment inventory for the facility is listed in Appendix E of this Plan. The inventory is checked monthly to ensure that used material is replenished. 3.5.4. Drainage System The facility surface drainage is sloped to direct oil that may be discharged into the on- site oil-water separator. Prior to discharging to the immediate land area (through an oil/water separator), fluids are visually inspected and sampled in accordance with appropriate regulations, as necessary.