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CORPORATION February 16, 2005 Mike Lee, Architect 3600 Seymour Ave. W. Sacramento, CA 95691 Fax: 916-372-8512 Re: One (1) Xerxes' 10 Foot 10,000 -gallon DW -II One (1) Xerxes' 10 Foot 15,000 -gallon DW -II Fremont Shell, 2494 E. Fremont St., Stockton, CA 95205 Dear Mr. Lee: We have summarized the buoyancy data you requested. All of the calculations are based on the site data you have provided to us and on nominal engineering values for the physical parameters. All of the calculations are based on standard engineering practice. Xerxes uses approaches in a manner similar to the protocols presented in the PEI/RP 100-20 manual to calculate the underground tank Buoyancy Safety Factors. I It is the tank owners responsibility to determine the suitability and applicability of installation. Our sole responsibility in any installation is as stated in our Limited Warranty. Our calculations show that, given the installation parameters that you have provided to us (calculated with water table at grade, buried to a depth of four feet, and anchored with deadmen) the Buoyancy Safety Factors are as follows: Buoyancy Safety Factor 10 Foot 10,000-qallon DW -II 10 Foot 15,000 -gallon DW -II Xerxes recommends a minimum Buoyancy Safety Factor of 1.20:1. 1 have included copies of the worksheets for you, files. If we can be of additional Yours truly, John Burwell, M.S., P.E. Manager, Engineering Services Attachments C: Bill Robbins nce, please feel free to contact us. I hereby certify that this plan, specification, or report was prepared by me or under my direct supervision and that I annduly L?1ensed Professional Engineer and (; t s of the State of Minnesot Burwell Na. 24679 CORPORATE OFFICE/7901 XERXES AVENUE SOUTH, MINNEAPOLIS, MINNESOTA 55431 PHONE (952) 887-1890 FAX (952) 887-1870