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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 /> Tank Integrity: The tank has been in service for 11 years and shows no <br /> evidence of leaks. <br /> Ultrasonic Thickness Gauge Measurements <br /> Ultrasonic Thickness <br /> Used Antifreeze Tank <br /> Data Point Thickness Units <br /> 01 0.224 IN <br /> 02 0.206 IN <br /> 03 0.206 IN <br /> 04 0.208 IN <br /> 05 0.207 IN <br /> 06 0.178 IN <br /> 07 0.216 IN <br /> 08 0.216 IN <br /> 09 0.227 IN <br /> 10 0.219 IN <br /> average 0.211 IN <br /> std. dev. 0.014 IN <br /> Hydrostatic Calculation <br /> Hydrostatic Calculation Used Antifreeze Tank <br /> Tank wall thickness, in 0.21 <br /> Tank Dia. In. 36.00 <br /> Depth of fluid in tank, ft 3.45 <br /> S.G. of Fluid 1.05 <br /> Pressure of fluid at bottom of tank, psi 1.57 <br /> hoop stress at bottom of shell, psi 134.55 <br /> Yield Strength HDPE 3000.00 <br /> effective allowable stress, psi 1197.00 <br /> Safety Factor 8.90 <br /> Strandberg Associates 1(866) 388-0404 john@strandbergassociates.com 19 <br />