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Hazardous Waste Tank System July <br /> Written Assessment per CCR Title 22 <br /> Applied Aerospace Structures, Inc., Stockton, CA 95206 2017 <br /> Leak Test: <br /> The tank has been in service for 24 years and shows no evidence of <br /> leakage. <br /> Ultrasonic Thickness Measurements <br /> The Survey Name: AAST1 Tank 1 UTG <br /> Data Point ID Thickness Units <br /> 01 0.380 IN <br /> 02 0.370 IN <br /> 03 0.370 IN <br /> 04 0.360 IN <br /> 05 0.360 IN <br /> 06 0.380 IN <br /> 07 0.370 IN <br /> 08 0.370 IN <br /> 09 0.370 IN <br /> 10 0.320 IN <br /> Average 0.365 IN <br /> Std. Dev. 0.017 IN <br /> Hydrostatic Calculation: <br /> Hydrostatic Calculation: Applied Aerospace Structures <br /> Tank 1, Chrome Treatment <br /> Tank wall thickness, in 0.36 <br /> Tank Dia. In. 12.00 <br /> Depth of fluid in tank, ft. 66.00 <br /> S.G. of Fluid 1.00 <br /> Pressure of fluid at bottom of tank, psi 28.60 <br /> hoop stress at bottom of shell, psi 476.67 <br /> Yield Stress LDPE, psi 2000.00 <br /> joint efficiency 1.00 <br /> effective allowable stress, psi 2000.00 <br /> Safety Factor 4.20 rd <br /> Tank is Okay for Hydrostatic t aLj <br /> AUG 0 2 2017 <br /> ENVIRQNI`v1EI`J-I-AL HEALTH <br /> DEPARTMENT <br /> Strandberg Associates 1(866) 388-0404 rwaterquy@rwaterquy.com 16 <br />