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Hazardous Waste Tank System June <br /> Written Assessment per CCR Title 22 <br /> Zoom Car Wash 4661 Quail Lakes Dr. Stockton CA 95207 2019 <br /> Ultrasonic Thickness Gauge Measurements <br /> UTG Measurement - Used Oil Tank <br /> Data Point Thickness Units <br /> 01 0.141 IN <br /> 02 0.141 IN <br /> 03 0.141 IN <br /> 04 0.142 IN <br /> 05 0.141 IN <br /> 06 0.140 IN <br /> 07 0.139 IN <br /> 08 0.138 IN <br /> 09 0.140 IN <br /> 10 0.140 IN <br /> average 0.140 IN <br /> std. dev. 0.001 IN <br /> Hydrostatic Calculation <br /> Hydrostatic Calculation - Used Oil Tank <br /> Rectangular <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 28.80 <br /> Area of wetted wall, ft2 45.60 <br /> S.G Contents 0.95 <br /> Average Pressure, Ib/ft2 71.14 <br /> Resultant Force, Ibs 3243.80 <br /> Location of Resultant Force, from bottom, in 9.60 <br /> Moment, ftlbf of R 2595.04 <br /> Resisting Moment at top of tank, B 2595.04 <br /> Resisting Moment arm at B, ft 2.67 <br /> Resisting Force at B 973.14 <br /> Resisting Force at bottom of tank at A 2270.66 <br /> Area of tank bottom under tension, M2 31.92 <br /> Tensile stress at tank wall bottom corner, psi 71.14 <br /> Effective Yield Strength > Applied Tensile Stress <br /> Factor of Safety 246.01 <br /> Strandberg Associates 1(866) 388-0404 john@strandbergassociates.com 11 <br />