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American Biodiesel PONSilo S-1 <br /> Stockton,CA 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 0.230 0.258 3 0.210 0.248 <br /> 2 0.240 0.258 4 0.224 0.255 <br /> UT Summary <br /> Minimum 0.210 <br /> Maximum 0.258 <br /> Average 0.240 <br /> Report Date Petroleum&Refractory, Inc. Page 13 of 21 <br /> March 6,2007 TankReporter 13.91 <br />