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TABLE II -TANK DESIGN STANDARDS <br /> Design Standard to Material Thickness <br /> Method used to <br /> Tank or Ancillary which Equipment (Tank thickness, Determine Tank System Age <br /> Equipment Description was pipe Thickness (years) <br /> Constructed diameter, etc.) <br /> Waste Oil Tank UL 142 0.149" (average of measured - ultrasonic 23 <br /> 3 readings) <br />