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Hazardous Waste Tank System January <br /> Written Assessment per CCR Title 22 <br /> Lube Zone 24511 Hwy 99 Acampo, CA 95220 2020 <br /> Tank Integrity: The tank is new. No evidence of leaking. UL142 tank <br /> Ultrasonic Thickness Gauge Measurements <br /> UTG Measurement - Used Oil Tank <br /> Data Point Thickness Units <br /> 01 0.262 IN <br /> 02 0.260 IN <br /> 03 0.258 IN <br /> 04 0.252 IN <br /> 05 0.246 IN <br /> 06 0.253 IN <br /> 07 0.259 IN <br /> 08 0.252 IN <br /> 09 0.251 IN <br /> 10 0.248 IN <br /> average 0.254 IN <br /> std. dev. 0.005 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 95.40 <br /> Area of wetted wall, ft2 , one-inch method 0.66 <br /> S.G Contents 0.95 <br /> Average Pressure, Ib/ft2 235.64 <br /> Resultant Force, lbs 156.11 <br /> Location of Resultant Force, from bottom, in 31.80 <br /> Moment, ftlbf of R 413.69 <br /> Resisting Moment at top of tank, B 413.69 <br /> Resisting Moment arm at B, ft 8.83 <br /> Resisting Force at B 46.83 <br /> Resisting Force at bottom of tank at A 109.28 <br /> Area of tank bottom under tension, in2 0.25 <br /> Tensile stress at tank wall bottom corner, psi 437.11 <br /> Effective Yield Strength > Applied Tensile Stress <br /> Factor of Safety 40.04 <br /> Strandberg Associates 1(866) 388-0404 john@strandbergassociates.com 14 <br />