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XAFERXES <br /> CORPORATION <br /> making a lasting difference' <br /> April 10, 2018 <br /> Terry Hesseltine Cc: Rick Whately, Xerxes <br /> E-mail: thesseltinegdimensiongrp.com <br /> Re: One 10-foot-diameter 20,000-gallon Double-Wall Tank (wet interstice) <br /> One 10-foot-diameter 12k x 8k-gallon Double-Wall MCT (wet interstice) <br /> Buoyancy Calc— 7-Eleven #38153 - Stockton, CA (W Market & Center St) <br /> Dear Terry: <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 /> 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 /> 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 /> Our calculations show that, given the installation parameters that you have provided <br /> to us (calculated with the tank empty, burial depth of 4 feet 9 inches, the water <br /> table at the finished grade, and anchored with factory-supplied deadmen) the <br /> Buoyancy Safety Factors are as follows: <br /> Tank Buoyancy Safety Factor <br /> 10-foot-diameter 20,000-gallon Double-Wall Tank 1.52:1 <br /> 10-foot-diameter 12k x 8k-gallon Double-Wall MCT 1.46:1 <br /> We recommend a minimum Buoyancy Safety Factor of 1.20:1. I have included <br /> copies of the worksheets for your files. <br /> If we can be of additional assistance, please feel free to contact us. <br /> Sincerely, <br /> 4 <br /> Te finder Singh <br /> RECE11V`ED <br /> J 9 <br /> Design Engineer-Sales Support OCT 2 5 2018 <br /> Attachment - 2 <br /> ENVIRONMENTAL HEALTH <br /> DEPARTMENT <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 />