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0 <br />XERXES@ <br />CORPORATION <br />March 1, 2004 <br />Mr. Dave Johnson <br />Northwest Pump <br />Fax: 916-373-1221 <br />Re: Xerxes 10'20,000 -gallon DWT -II (w/ brine) <br />Xerxes 10' 12,000 -gallon x 8,000 -gallon DWT -II (w/ brine) <br />Stockton 76 <br />Dear Mr. Johnson, <br />• <br />C: Bill Robbins <br />Robbins Associates <br />Fax: 925-283-4709 <br />We have summarized the buoyancy data you requested. All of the calculations are based on the <br />site data that you have provided to us and on standard engineering values for the physical <br />parameters, which you provided for the site. <br />All of the calculations have been made in accordance with the protocols presented in the PEI <br />manual RP -100/2000. These protocols present an analysis of underground tank buoyancy, <br />which is based on sound engineering practice. <br />It is the tank owner's responsibility to determine the suitability and applicability of installation. <br />Our sole responsibility in any installation is that presented in our standard warranty. <br />Our calculations show that, given the installation parameters you have provided to us (water <br />table at tank top, burial depth of 60 inches, unanchored), the Buoyancy Safety Factors are as <br />follows: <br />Tank Size Buoyancy Safety Factor <br />10'20K DWT-II..................................................................... 1.74:1 <br />10' 12K x 8K DWT-II................................................................. 1.70:1 <br />Xerxes recommends 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 />Sincerely, <br />John Burwell, PE ' <br />Manager, Engineering Services <br />Attachments <br />hereby certify that this pian, speCifion, or <br />my <br />report was prepared by me or under my direct <br />I am a duly Licensed <br />supervision and that he laws of the <br />Professional EnginouState of Minne aBurwell <br />_John R. <br />No. 24679 <br />Date <br />CORPORATE OFFICE/7901 XERXES AVENUE SOUTH, MINNEAPOLIS, MINNESOTA 55431 <br />PHONE (952) 887-1890 FAX (952) 887-1870 <br />