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Jun 03 04 04:20p BILL ROBBINS 925-283-4709 P.1 <br />06/03/04 16: 7.3 FAX 932 8 S7 XERXES CORP. WM ROBBINS 4001/003 <br />qP is <br />701 -0-7-MM-31M �71# <br />I IV V5 W) <br />,;a- Xerxes IV 20,000 -gallon 1WT-11 (w brine) <br />Xerxes 10! 12,000 -gallon x 8,000-plion DWNI (wl brine) <br />1-5 Shell, 717 West e St., Stockton, CA 95206 <br />C: Bill Robbins <br />Robbins Associates <br />Fax: 925-283-4709 <br />Mike Enslow <br />t—LJ. Weaver <br />site data that you have provided tD 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 masixxsWity in any installation is that presented in our standard warranty. <br />Our calculations show dmt given the installation parameters you have provided to us (water <br />table at tankoDp, burial depth of 60 inches, unanchored), the &xyvancv Safety Factors are as <br />follows: <br />Tank Typ Ougam Saft E= <br />11Y 20K DVVT-II ................................................. 1,74.1 <br />10'12K x SK DWT -I1 .............................................. 1.70:1 <br />worksheets for your rNts. Ic <br />a= <br />I�LF!7 ��,7­ 9 T'W#MrTAW_11 <br />CORPORATE OFFiCEM1 XERXES AVENUE SOUTH, MINNEAPOL4. MINNES07A55431 <br />PHONE (952) 687-1590 FAX (952)897-1670 <br />