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XERXES <br /> CORPORATION <br /> August 7, 2020 <br /> Nathan Groover CC: Rick Whately <br /> E-mail: ngroover0din-ensionoroui).com <br /> Re: One 10-foot-diameter 20,000-gallon Double-Wall <br /> One 10-foot-diameter 12,000 x 8,000-gallon Double-Wall MCT <br /> Buoyancy Calc - 7-Eleven #41342, 1233 E Charter Way, Stockton, CA <br /> Dear Nathan: <br /> We have summarized the buoyancy data you requested. All of the calculations are based <br /> on the site data you have provided to us and on nominal engineering values for the <br /> physical parameters. <br /> All of the calculations are based on standard engineering practice. We use approaches <br /> in a manner similar to the protocols presented in the PEI/RP 100-17 manual to calculate <br /> 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 to <br /> us (calculated with the tank empty, burial depth of 5 feet and 3 inches, the water table <br /> at the same elevation as finished grade, and anchored using factory-supplied deadmen) <br /> the Buoyancy Safety Factors are as follows: <br /> Tank Buoyancy Safety Factor <br /> 20,000-gallon Tank 1.60:1 <br /> 12,000 x 8,000-gallon MCT 1.53:1 <br /> We recommend a minimum Buoyancy Safety Factor of 1.20:1. I have included copies of <br /> the worksheets for your files. <br /> If we can be of additional assistance, please feel free to contact us. <br /> Sincerely, <br /> Te inder Singh <br /> Design Engineer-Sales Support <br /> Attachments- 2 <br /> 7901 Xerxes Avenue South• Minneapolis• Minnesota•United States •55431-1288 <br /> Ph:952-887-1890• Fax:952-887-1870•Web:www.zcl.com <br />