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- Mf-714 TIF1-F3f_70LrjjET7 Ake�n xouuqG ryn CFR 112), or active secondary containment for the oil-filled equipment and OWS pump out operation. The 24-hour rainfall depth for the 25-year storm event at this location is 2.89 inches. (https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_map_cont.html?bkmrk=ca). This value is deemed by the PE as a conservative capacity for a rain event. The areas that would function as either secondary (or tertiary) containment, or as active secondary containment measures (for possible releases from the transformers) is as follows: Oil Storage area Containment Area Net depth Net Containment (ft2) (inches or volume) Volume(gallons) Tank Farm Concrete berm 67'x21' = 6"-2.89" = 2,188 and pad 1407 ft2 3.11" Tank Farm Covered Storm 100'x100' = 9,444 ft3—2,408 ft3 = 52,700 Drain Collection 10,000 ft2 7,036 ft3 area, east (pyramidal) Tank Farm Covered Storm 80'x55' = 2,078 ft3-1,060 ft3= 7,625 Drain Collection 4,400 ft2 1,018 ft3 area, west (pyramidal) O/W Separator Covered Storm Est. 3,000 ft2 Dry weather 2062 pump out Drain, curb and curb height containment is 750 ft3 gutter area 6", 20 ft (5,600 gals) (south) wide, 150 Net with design storm lineal feet event': 206 gals available O/W Separator Covered Storm 80'x55' = 2,078 ft3-1,060 ft3 = 7,6252 pump out Drain Collection 4,400 ft2 1,018 ft3 area, west of fuel island (pyramidal) Transformer XF-1 Covered Storm Est. 3,000 ft2 Dry weather 206 Drain, curb and curb height containment is 750 ft3 gutter area (west) 6", 20 ft (5,600 gals) wide, 150 Net with design storm lineal feet event': 206 gals available Transformer XF-2 Covered Storm Est. 3,000 ft2 Dry weather 206 Drain, curb and curb height containment is 750 ft3 gutter area (east) 6", 20 ft (5,600 gals) wide, 150 Net with design storm lineal feet event': 206 gals available Secondary Containment Calculations Page 4 of 5 Appendix L