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Hazardous Waste Tank System January <br /> Written Assessment per CCR Title 22 <br /> Jiffy Lube Store#2322 500 E. Kettleman Lane, Lodi, CA 2020 <br /> Tank Integrity: The tank has been in service for 20 years and shows no <br /> evidence of leaking. <br /> Ultrasonic Thickness Gauge Measurements <br /> UTG Thickness - Used Oil Tank <br /> Data Point Thickness Units <br /> 01 0.159 IN <br /> 02 0.162 IN <br /> 03 0.159 IN <br /> 04 0.157 IN <br /> 05 0.160 IN <br /> 06 0.158 IN <br /> 07 0.160 IN <br /> 08 0.158 IN <br /> 09 0.160 IN <br /> 10 0.160 IN <br /> average 0.159 IN <br /> std. dev. 0.001 IN <br /> Hydrostatic Calculation <br /> Hydrostatic Calculation - Used Oil Tank <br /> Rectangular <br /> Material of Construction Steel <br /> Yield Strength, psi 30000.00 <br /> Design Yield Strength, psi 25000.00 <br /> Weld Efficiency 0.70 <br /> Effective Yield Strength, psi 17500.00 <br /> Depth of Liquid, in 56.70 <br /> Area of wetted wall, ft2 11.03 <br /> S.G Contents 0.95 <br /> Average Pressure, Ib/ft2 140.05 <br /> Resultant Force, lbs 1544.04 <br /> Location of Resultant Force, from bottom, in 18.90 <br /> Moment, ftlbf of R 2431.86 <br /> Resisting Moment at top of tank, B 2431.86 <br /> Resisting Moment arm at B, ft 5.25 <br /> Resisting Force at B 463.21 <br /> Resisting Force at bottom of tank at A 1080.83 <br /> Area of tank bottom under tension, in2 4.48 <br /> Tensile stress at tank wall bottom corner, psi 241.26 <br /> Effective Yield Strength > Applied Tensile Stress <br /> Factor of Safety 72.54 <br /> Strandberg Associates 1(866) 388-0404 john@strandbergassociates.com 10 <br />