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XERXES <br /> BY SHAWCOR <br /> July 14, 2021 <br /> Andrew Rotter Cc: Becky Egan <br /> E-mail: arotter@shieldsharper.com <br /> Re: One 10-foot-diameter 30,000-gallon Double-Wall Tank (wet interstice) <br /> One 10-foot-diameter 15k x 15k-gallon Double-Wall MCT (wet interstice) <br /> Buoyancy Calc— Safeway #0055 Mountain House <br /> Dear Andrew: <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 6 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 /> Tank Buoyancy Safety Factor <br /> 30,000-gallon Double-Wall Tank 1.66:1 <br /> 15k x 15k-gallon Double-Wall MCT 1.61:1 <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 /> FESS/10AN <br /> Tejlnder Singh <br /> Applications Engineer ,tiT, Reviewed&Digitally signed: <br /> w NoCC: . 61054 z 07/19/2021 <br /> Yatai Consultants,inc. <br /> Attachment - 2 �Q 27758 Santa Margarita Pkwy#238, <br /> -4T C/VI\- Mission Viejo,CA 92691 <br /> Tel:949-468-9702 <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 />