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Simplot Grower Solutions—4863 Carpenter,Stockton CA Date: September 2019 <br /> — SPILL PREVENTION CONTROL AND COUNTERMEASURE PLAN Page: 25 <br /> ATTACHMENT C-SECONDARY CONTAINMENT CALCULATIONS <br /> PRECIPITATION ALLOWANCE <br /> Precipitation(P)associated with a 25-year,24-hour storm in Stockton,California=3 inches <br /> Ref: Miller,7.F., et al., 1973. Precipitation-Frequency Atlas of the Western United States. US <br /> Department of Commerce,National Weather Service,NOAA Atlas 2, Silver Springs, MD. <br /> CHEMICAL TANK FARM <br /> Volume of largest tank inside dike= 10,000 gallons <br /> Containment Dimensions: <br /> Dike footprint=30 ft X 50 ft= 1,500 ft'- <br /> Dike height=3 ft <br /> Dike volume= 30 ft X 50 ft X 3 ft=4500 ft3 X 7.48 gal/ft3=33,600 gallons <br /> Capacity of Tanks inside Dike Area Displacing Containment Volume.- <br /> Note: <br /> olume:Note:Tank 12 is elevated approximately 2 ft off the ground on stilts. All other tanks rest on the <br /> ground, <br /> ., Tank 4 (8' diameter x 3' height)=Pi X(8'/2)'-X 3= 151 ft3 <br /> Tank 5 (12' diameter x 3' height) =Pi X (12'/2)'X 3 = 339 ft3 <br /> Tank 7 (12' diameter x 3' height) =Pi X (12'/2)'-X 3 = 339 ft3 <br /> Tank 8 (8' diameter x 3' height) =Pi X(8'/2)'-X3 = 151 ft3 <br /> Tank 12 (12,' diameter x F height) =Pi X(8'12'/2)2 X 1 = 113 ft3 <br /> Total Displacement= 1,093 ft3 X 7.48 gal/ft3= 8,175 gal <br /> Precipitation.- <br /> 25-year, <br /> recipitation:25-year, 24 hour event=3 inches (0.25 ft) <br /> Dike Area: 1,500 ft' <br /> Precipitation volume=0.25 ft X 1,500 ft'-=375 ft3 X 7.48 gal/ft3=2,805 gal <br /> Available Containment Volume: <br /> 33,600 gal—(8,175 gal+2,805 gal)=22,620 gallons available. <br /> Conclusion: Volume is sufficient to contain a release from the largest oil tank(10,000 gallons) <br /> and has sufficient freeboard for precipitation. <br /> F� <br />