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programmed to read as"thru-coat", or to read through the paint and indicate only the metal thickness of the steel sidewall. At the site, the unit was again tested against in-field calibration standards: 0.05 and 1.5". The unit measured 0.053 and 1.506", respectively. A nameplate attached to the tank indicated the tank was manufactured in Anderson, Ca by Arrow Tank Works; Length=96"; Diameter=56"; Approximate gallons= 1,000;tank gauge= 10. A 10-gauge steel plate is nominally 0.1345"in thickness with a tolerance range of 0.1405 to 0.1285"(REF: Advantage Fabricated Metals). The tank was installed level as indicated by a carpenters level. Tank critical areas for corrosion are typically the tank bottom at the lowest tank elevation where water can accumulate. For a level tank, water can accumulate across the entire bottom. Additionally, metal thicknesses were also measured on the top of the tank, above the oil level, to determine if condensate impacted the tank steel thickness. To complete the survey,random wall thickness measurements were taken along the tank wall sides to provide a complete picture of the tank side wall thickness integrity. Steel thickness Measurements Tank Bottom: 8 locations approximately 1 foot apart, from east to west: 0.132", 0.135, 0.135, 0.136,0.134, 0.135,0.152, 0.132 Average wall thickness=0.136" Tank Top: 6 locations from east to west: 0.135", 0.136, 0.136,0.133, 0.132, 0.132 Average wall thickness=0.134" Tank East End: 2 locations Average wall thickness=0.134" Tank West End: 3 locations Average wall thickness=0.130" Tank Side Walls At Spring-line Average wall thickness=0.134" Tank Wall Thickness at Time of Manufacture=0.1345"(Nominally 10-gauge steel Conclusion—tank integrity by wall thickness measurements meets 10-gauge standard Tank Wall Thickness Testing Page 2