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XERXES <br /> BY SHAWCOR <br /> March 29 , 2021 <br /> Art Gomez CC : Patrick McDermott <br /> E - mail : art . gomez@nwpump . com <br /> Re : One 10 - foot- diameter 20 , 000 - gallon Double- Wall <br /> One 10 - foot- diameter 10 , 000 x 10 , 000 - gallon Double - Wall <br /> Buoyancy Calc - International Pkwy and Daylight Rd Tracy <br /> Dear Art : <br /> We have summarized the buoyancy data you requested . All of the calculations are based on <br /> the site data you have provided to us and on nominal engineering values for the physical <br /> parameters . <br /> All of the calculations are based on standard engineering practice . We use approaches in a <br /> manner similar to the protocols presented in the PEI/ RP 100 - 20 manual to calculate the <br /> 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 Warranty . <br /> Our calculations show that, given the installation parameters that you have provided to us <br /> ( calculated with the tank empty , burial depth of 5 feet, the water table at the same <br /> elevation as finished grade , and using factory - supplied deadmen ) the Buoyancy Safety <br /> Factors are as follows . <br /> Tank Buoyancy Safety Factor <br /> 20 , 000 1 . 54 : 1 <br /> 10 , 000 x 10 , 000 1 . 43 : 1 <br /> We recommend a minimum Buoyancy Safety Factor of 1 . 20 : 1 . I have included copies of the <br /> worksheets for your files . <br /> If we can be of additional assistance , please feel free to contact us . <br /> I Sincerely , <br /> Vf <br /> QgOF ESS/pH <br /> Jef rey Lexvold9efred do NS S . ql <br /> Senior Applications Engineer � <br /> Attachments - 2 Reviewed & Digitally signed : <br /> a No. 61 054 05/21 /2021 <br /> Yatai Consultants, inc . <br /> �Q 27758 Santa Margarita Pkwy #238, <br /> Mission Viejo, CA 92691 <br /> F Or CA��F Tel: 949-468-9702 <br /> 7901 Xerxes Avenue South • Minneapolis • Minnesota ^ United States • 55431A288 <br /> Ph : 952-887 - 1890 • Fax : 952-887- 1870 • Web : www , xerxes . com <br />