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Steamboat North Concrete Plant <br />GL 851 <br />SPCC Plan <br />ATTACHMENT E <br />INTEGRITY TESTING WORKSHEET ATTACHMENTS <br />Lafarge will perform integrity testing on oil containing Aboveground Storage Tanks <br />(ASTs). The tests will be performed on a regular schedule and whenever material repairs <br />are made. This testing will use one of the following testing methods such as hydrostatic, <br />radiographic, ultrasonic, acoustic emissions, or another system ofnon-destructive shell <br />testing. <br />Lafarge will perform ultrasonic shell testing as the method used for testing the ASTs <br />integrity. Lafarge will likely use an A&D Company's Ultrasonic Thickness Gage (AD- <br />3253) or an equivalent ultrasonic device. The instruction manual for any ultrasonic <br />thickness gage should be reviewed before performing an integrity test. The testing will <br />be performed on a regular schedule that will be based upon the condition and age of the <br />each AST. An integrity test worksheet is attached in this attachment to be copied and <br />used by competent personnel. This worksheet record should be kept with this plan for 3 <br />years. <br />During the integrity testing, each AST will be separated into three zones labeled A, B, <br />and C. The zones will run horizontally across the tank, with zones A being at the top and <br />zones C being at the bottom. Each of the horizontal zones will have a minimum of 14 <br />points of measurement, or shots, taken around the tank. A minimum of six shots will be <br />taken along the length of the tank on one side, while a minimum of six shots will be taken <br />on the opposite side. A minimum of one shot will be taken from each end of the tank. <br />Additional shots maybe taken where necessary. Please refer to the attached worksheet <br />form for an example of the shots' locations. <br />24 <br />