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Calculation of Secondary Containment Capacity <br /> T & T TRUCKING, INC. <br /> 11396 North Highway 99, Lodi, California <br /> CONCRETE SECONDARY CONTAINMENT BERM CAPACITY(ASTs 1-5): <br /> General top view shape is a rectangle with a small area along the southern wall blocked off for the dispenser <br /> island. <br /> Total Berm Volume = ((L x W x H)—dispenser island area)x 7.48 gallons per cubic foot(gal/ft3) <br /> = ((55.7 x 12.7 x 5.67)—68)x 7.48 <br /> _ (4,010—68)ft3 x 7.48 gal/ft3 <br /> = 3,942 ft3 x 7.48 gal/ft3 <br /> = 29,486 gallons <br /> AST Displacement Within Berm: <br /> AST Storage AST Type Height Radius of Volume (ft3) Volume (gal) <br /> No. Capacity Beneath Berm Tank <br /> 1 20,000 Vertical Cylinder 5.67 5 445.3 3,330.8 <br /> 2 10,000 Vertical Cylinder 5.67 5 285.0 2,131.8 <br /> 3 12,000 Vertical Cylinder 5.67 5.25 491.0 3,672.7 <br /> 4 1,000 Vertical Cylinder 5.67 2.5 111.3 832.5 <br /> L x W Volume ft3 Volume al <br /> 5 500 Square 4.25 16 68 508.6 <br /> TOTAL= 1,400.6 10,476 <br /> 25-year/ 24-hour precipitation rate for Lodi is 3.1 inches. Given the area of the secondary containment <br /> berm, precipitation would take up a volume of 179.64 ft3 or 1,344.7 gallons. <br /> Containment Capacity = (Total Berm Volume — AST Displacement — Precipitation Rate) + Volume of <br /> Largest Tank beneath secondary containment berm that would reach equilibrium <br /> _ (29,486— 10,476— 1,344) + 3,330.8 <br /> = 20,996 gallons > 20,000 (largest tank volume) <br /> The concrete secondary containment berm is sufficient to contain a spill of 100% of the largest <br /> aboveground tank plus the 25-year/24-hour precipitation rate(3.1 inches) for Lodi, California. <br /> CONTAINMENT BERM CAPACITY(ASTs 7-10): <br /> General top view shape is a rectangle. <br /> Secondary Containment Volume = (L x W x H)x 7.48 gallons per cubic foot(gal/ft3) <br /> _ (26.25 ft x 14.42 ft x 0.25 ft)x 7.48 gal/ft3 <br /> = 94.63 ft3 x 7.48 gal/ft3 <br /> = 708 gallons <br /> The containment berm is sufficient to contain a spill of 110% of the largest above ground tank(550- <br /> gallons)plus precipitation. <br />