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Hazardous Waste Tank System December <br /> Preliminary Written Assessment per CCR Title 22 <br /> Chase Chevrolet quick Lube Stockton,CA 95212 2013 <br /> Tank Integrity: The tank has been in service for 10 years and shows no <br /> evidence of leakage. <br /> Ultrasonic Thickness Gauge Measurements <br /> S CA <br /> The Survey Name C <br /> Waste Antifreeze UT <br /> Data Point ID Thickness Units <br /> 01 0.240 IN <br /> ' 02 0.250 IN <br /> 03 0.240 IN <br /> ' 04 0.240 IN <br /> 05 0.250 IN <br /> 06 0.250 IN <br /> ' 07 0.250 IN <br /> 08 0.240 IN <br /> 09 0.240 IN <br /> 10 0.240 IN <br /> Average 0.244 IN <br /> std. dev. 0.005 IN <br /> Hydrostatic Calculation <br /> Hydrostatic Calculation: Waste Antifreeze Tank <br /> Tank wall thickness, in 0.24 <br /> Tank Dia. In. 38.00 <br /> Depth of fluid in tank, ft. 3.68 <br /> S.G. of Fluid 1.05 <br /> Pressure of fluid at bottom of tank, psi 1.67 <br /> hoop stress at bottom of shell, psi 132.38 <br /> HDPE, Strength, Tensile, PSI 4550.00 <br /> effective allowable stress, psi 2593.50 <br /> Safety Factor 19.59 laECEIVED <br /> APS 2 5 2014 <br /> DEPARTMENTENVIRONMENTALHEALTH <br /> Strandberg Associates 1(866) 388-0404 rwaterguyarwaterguy.corn 22 <br />