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0 <br />Hazardous Waste Tank System <br />Preliminary Written Assessment per CCR Title 22 <br />Chase Chevrolet quick Lube Stockton, CA 95212 <br />December <br />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 />Data Point ID <br />Thickness <br />Units <br />Tank DW. In. 38.00 <br />01 <br />0.240 <br />IN <br />S.G. of Fluid 1.05 <br />02 <br />0.250 <br />IN <br />hoop stress at bottom of shell, psi 132.38 <br />03 <br />0.240 <br />IN <br />effective allowable stress, psi 2593.50 <br />04 0.240 <br />IN <br />05 0.250 <br />IN <br />06 <br />0.250 <br />IN <br />07 <br />0.250 <br />IN <br />08 <br />0.240 <br />1 N' <br />09 <br />0.240 <br />IN <br />10 <br />0.240 <br />Average <br />0.244 <br />IN <br />std. dev. <br />0.066 1 <br />IN <br />Hydrostatic Calculati <br />Strandberg Associates 1(866) 338-0404 watergu rwateMuy.com 23 <br />Tank wall thickness, in 0.24 <br />Tank DW. In. 38.00 <br />Depth of fluid intank, 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 />HIDLPE, Strength, Tensile, PSI 4550.00 <br />effective allowable stress, psi 2593.50 <br />Safety Factor 19.59 <br />Strandberg Associates 1(866) 338-0404 watergu rwateMuy.com 23 <br />