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• o <br />• <br />• <br />March 12, 2024 <br />Mike Lee <br />E-mail: mleeaia@jps.net <br />CC: Patrick McDermott <br />Re: One 10 -foot -diameter 24,000 x 6,000 -gallon Double -Wall Tank <br />One 10400t -diameter 15,000 x 15,000 -gallon Double -Wall Tank <br />Buoyancy Calc - Tracy Triangle - Tracy CA <br />Dear Mike: <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 100-20 manual to <br />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 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 5.5 feet, the water table at the <br />same elevation as finished grade, and using the factory -supplied anchoring system) the <br />Buoyancy Safety Factors are as follows. <br />Tank <br />Buoyancy <br />Safety Factor <br />24,000 x 6,000 -gallon <br />1.51:1 <br />15,000 x 15,000 -gallon <br />1.51:1 <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 />Jeffrey Lexvold <br />Senior Applications Engineer <br />Attachments - 2 <br />Xerxes Corporation 1-952-887-1890 <br />7901 Xerxes Avenue S, Suite 201 xerxes.com <br />Minneapolis, MN 55431-1288 mattr.com <br />