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May 28 08 01:19p BILL ROBBINS 925-283-4709 p.1 <br />6 i <br />CORPORAMN <br />March 8, 2006 <br />RE: Biodiesel Compatibility <br />To Whom It May Concern: <br />Please be advised that it is acceptable to store biodiesel, as defined by the U. S. <br />Department of Energy (DOE), in our standard single or double wall underground <br />fiberglass storage tanks, subject to Xerxes applicable Limited Warranty. The DOE <br />defines biodiesgl as: <br />Any liquid biofuel suitable as a diesel fuel substitute or diesel fuel <br />additive or extender. Biodiesel fuels are typically made from oils <br />such as soybeans, rapeseed, or sunflowers, or from animal tallow. <br />Biodiesel can also be made from hydrocarbons derived from <br />agricultural products such as rice hulls. <br />Xerxes' Limited Warranty applies to tanks installed in accordance with the <br />provisions of Xerxes' current Installation Manual & Operating Guidelines. Since <br />Xerxes does not control the parameters of any installation or tank operation, our <br />sole responsibility is as stated in our warranty, except for any specific variance set <br />forth in this letter. <br />Thank you for your interest in Xerxes products. <br />Very truly yours, <br />Terry Jensen <br />Manager, Sales & Marketing Services <br />Xerxes Corporation 7901 Xerxes Avenue South, Minneapolis, MN 55431-1288 <br />Telephone 952-887-1890 Facsimile 952- 887-1870 <br />