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Page 9 Table 4: Potential Spill/Release Scenarios Location/Container Spill Direction Spill Volume Probable Secondary Containment Max. Spill Volume Area A—Central Utility Plant 10,000-gallon diesel East and south Tank is double wall, fuel tank (AST) towards on-site catch 10,000 gallons 75 gallons placed within masonry basins with bio-filter wall enclosure screens 150-gallon day use Spill contained inside 150 gallons Tanks are double wall, tank (AST) building with drain to 15 gallons placed within open top storm drain dikes Area B— Main Hospital Building 6,000-gallon diesel fuel tank (Exempt) (Exempt) (Exempt) (Exempt) (UST)(Exempt) 275-gallon day use Spill contained inside tank (AST) building with drain to 275 gallons (N/A) (Tank not in use) storm drain 100-gallon day use Spill contained inside tank (AST) building with drain to 100 gallons (N/A) (Tank not in use) storm drain 50-gallon day use tank Spill contained inside (AST) building with drain to 50 gallons (N/A) (Tank not in use) storm drain 250-gallon grease trap West along Magnolia 250 gallons (N/A) Tank is double wall St. to catch basin Area C—530 Building 250-gallon diesel fuel Southeast towards on- Tank is double wall, tank (AST) site catch basin with 250 gallons 75 gallons placed within open top bio-filter screen diked generator base Area A: The 10,000-gallon AST is double walled UL approved and thus fully complies with secondary containment. The AST sits within a 10-foot tall masonry enclosure with limited access. It also has spill containment bucket, interstitial monitoring of tank bottom, and flow shut-off. Because this AST is a double-wall tank, the greatest risk for a potential spill exists during the refilling process. The 10,000-gallon AST is filled approximately once every six months. In the event of a spill during refilling, the pipelines would be shut off immediately. Absorbent waddles will be placed to contain the spill area and sorbent material will be used to collect the spill material. The liquid waste will be disposed of using clean 55-gallon containers and the pavement steam cleaned. The bio-filters installed in the storm drain catch basins closest to the AST will aid in preventing petroleum from entering the storm drain system. These catch basins are labeled in the Spill Prevention Control and Countermeasure Plan in Appendix A. Dameron Hospital Spill Prevention Control and Countermeasure Plan June 12,2020