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Table II -Tank Design Characteristics <br /> Design Standard to Material Thickness Method used to <br /> Tank or Ancillary which Equipment Material of (Tank thickness, Determine Tank System Age <br /> Equipment Description was Construction pipe (years) <br /> Thickness <br /> Constructed diameter, etc.) <br /> 0.141" (average of 3 <br /> Waste Oil Tank UL 142 <br /> Steel readings) ultrasonic 14 <br /> Waste Water Tank UL 142 0.155" (average of 3 <br /> ultrasonic 14 <br /> Steel readings) <br /> Waste Coolant Tank UL 142 0.169" (average of 3 <br /> ultrasonic 14 <br /> Steel readings) <br />