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Hazardous Waste Tank System RECD JUL 2 0 2015 P, March <br /> Written Assessment per CCR Title 22 t <br /> Applied Aerospace Structures, lnc.. Stockton, CA 95206 2015 <br /> Tank Integrity: The tank has been in service for 20 years and shows no <br /> evidence of leakage. The tank is an engineered tank system. <br /> Ultrasonic Thickness Gauge Measurements <br /> The Survey Name: AASNS <br /> AWN1, Applied Aerospace <br /> Data Point ID Thickness Units <br /> 01 0.330 IN <br /> 03 0.360 IN <br /> 04 0.370 IN <br /> 05 0.360 IN <br /> 06 0.340 IN <br /> 07 0.360 IN <br /> 08 0.360 IN <br /> 09 0.360 IN <br /> 10 0.370 IN <br /> average 0.357 IN <br /> std. dev. 0.013 IN <br /> Hydrostatic Calculation <br /> Acid Waste Neutralization Tank 1 <br /> Rectangular <br /> Material of Construction Poly Propylene <br /> Yield Strength, psi 2900.00 <br /> Design Yield Strength, psi 2416.67 <br /> Weld Efficiency 0.70 <br /> Effective Yield Strength, psi 1691.67 <br /> Depth of Liquid, in 43.20 <br /> Area of wetted wall, ft2 36.00 <br /> S.G Contents 1.00 <br /> Average Pressure, lb./ft2 112.32 <br /> Resultant Force, lbs. 4043.52 <br /> Location of Resultant Force, from bottom, in 14.40 <br /> Moment, ftlbf of R 4852.22 <br /> Resisting Moment at top of tank, B 4852.22 <br /> Resisting Moment arm at B, ft. 4.00 <br /> Resisting Force at B 1213.06 <br /> Resisting Force at bottom of tank at A 2830.46 <br /> Area of tank bottom under tension, in2 43.20 <br /> Tensile stress at tank wall bottom corner, psi 65.52 <br /> Effective Yield Strength >Applied Tensile Stress <br /> Factor of Safety 25.82 <br /> Strandberg Associates 1(866) 388-0404 nwatergu cnm 17 <br />