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<br />7901 Xerxes Avenue South • Minneapolis • Minnesota • United States • 55431-1288 <br />Ph: 952-887-1890 • Fax: 952-887-1870 • Web: www.xerxes.com <br /> <br /> <br />September 16, 2021 <br /> <br />Matt Young Cc: Cary Etter <br />E-mail: myoung@shieldsharper.com Becky Egan <br /> <br />Re: One 10-foot-diameter 24k x 6k-gallon Double-Wall MCT (wet interstice) <br />One 10-foot-diameter 6k x 20k x 6k-gallon Double-Wall MCT (wet interstice) <br />Buoyancy Calc– Stockton Airport <br /> <br />Dear Matt: <br /> <br />We have summarized the buoyancy data you requested. All of the calculations are <br />based on the site data you have provided to us and on nominal engineering values <br />for the physical parameters. <br /> <br />All of the calculations are based on standard engineering practice. We use <br />approaches in a manner similar to the protocols presented in the PEI/RP 100-17 <br />manual to calculate the underground tank Buoyancy Safety Factors. <br /> <br />It is the tank owner's responsibility to determine the suitability and applicability of <br />installation. Our sole responsibility in any installation is as stated in our Limited <br />Warranty. <br /> <br />Our calculations show that, given the installation parameters that you have provided <br />to us (calculated with the tank empty, burial depth of 5 feet, the water table at the <br />same elevation as the finished grade, and anchored with factory-supplied deadmen) <br />the Buoyancy Safety Factors are as follows: <br /> <br />Tank Buoyancy Safety Factor <br />24k x 6k-gallon Double-Wall MCT 1.44:1 <br />6k x 20k x 6k-gallon Double-Wall MCT 1.39:1 <br /> <br />We recommend a minimum Buoyancy Safety Factor of 1.20:1. I have included <br />copies of the worksheets for your files. <br /> <br />If we can be of additional assistance, please feel free to contact us. <br /> <br />Sincerely, <br /> <br /> <br /> <br />Tejinder Singh <br />Applications Engineer <br /> <br />Attachment - 2 <br />