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American BiodieselSilo S-2 <br /> Stockton,CA g v_= Out of Service Inspection <br /> 8.4 Silo UT Grid Data <br /> The table below details the low to high thickness readings obtained during the UT grid survey of the silo shell <br /> and cone. Four V x V areas of the silo shell and cone were selected at random to be 100% UT scrubbed. The <br /> purpose of this inspection was to determine the extent, if any, of external corrosion and pitting. This UT survey <br /> did not reveal any significant corrosion or wall loss in any of the 4 randomly chosen areas. <br /> Low UT High UT Low UT High UT <br /> Reading Reading Reading Reading <br /> Grid# in. in. Grid# in. in. <br /> 1 0.218 0.252 3 0.211 0.241 <br /> 2 0.209 0.247 4 0.214 0.247 <br /> UT Summar <br /> Minimum 0.209 <br /> Maximum 0.252 <br /> Average 0.229 <br /> Report Date Petroleum&Refractory, Inc. Page 13 of 21 <br /> February 27,2007 TankReporter 13.91 <br />