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06/10/03 15:59 FAX 952 887 1870 XERXES CORP. Q001/003 <br /> CORPORATION <br /> June 5, 2003 <br /> Mr. Phil Stellflug C: (�SQ c/� Fib <br /> Glacier"Environmeftl Service U <br /> Fax: (425) 290-9186 <br /> Re: Xerxes 8', 10,000-gallon DWT-II(w/ brine) <br /> Xerxes 8, 15,000-gallon DWT-II (w/ brine) <br /> 7-Seven #32262,Tracy, California <br /> Dear Mr. Steliflug, <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 fbr 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 nk buoyancy, <br /> which is based on sound engineering practice. <br /> It is the tank 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 that you have provided to us <br /> (water table at mid-tank,Xerxes deadmen),the Buoyancy SafetV Factors are as follows: <br /> Ipnk j= Btx7yancv 590Y F <br /> 8', 10,000-gallon DWT-II.................................................... 5.13:1 <br /> 8', 15,000-galion DWT-II....................................................4.91:1 <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 a stance, please feel free to contaLt us. <br /> Sincerely, t thin plan,speciftatim,or <br /> report was prepared by ms or under my direct <br /> supervision and that f air a duty Licensed <br /> Protesslonall ne laws of the <br /> 000e State Of&filar <br /> John R.Burwell <br /> John Burwell, PE p l- 6P O2- ,Reg.No.24s73 <br /> Agnager,EWIneWng Savices <br /> Attachments <br /> CORPORATE OFFICE17901 XERXES AVENUE SOUTH,MINNEAPOLIS,MINNESOTA 55431 <br /> PHONE(952)887-1890 FAX'(952)887-1870 <br />