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Geophalytical Laboratories, c. <br />1405 Kansas Avenue Modesto, CA 95351 Phone (209) 572-0900 Fax (209) 572-0916 <br />CERTIFICATE OF ANALYSIS <br />Report# P122-12 BTEX Date: 5/09/03 <br />Thorpe Oil Project: Thorpe's Yard Date Rec'd: 5/02/03 <br />PO Box 357 Date Started: 5/06/03 <br />Lodi CA 95241 PO# Date Completed:5/06/03 <br />Date Sampled: 5/02/03 <br />Sampler: R. Azevedo (Geo) <br />Sample ID Lab ID RL Method Analyte Results Units <br />Line Sample #1 Q 4' P200646 5.0 8021B Benzene ND µg/Kg <br />5.0 Toluene ND µg/Kg <br />5.0 Ethyl Benzene ND µg/Kg <br />5.0 Total Xylenes ND µg/Kg <br />Surrogate <br />a,a,a-TFT <br />Line Sample #2 Q 4' P200647 5.0 8021B <br />5.0 <br />5.0 <br />5.0 <br />Surrogate <br />a,a,a-TFT <br />Line Sample #3 ® 4' P200648 5.0 8021B <br />5.0 <br />5.0 <br />5.0 <br />Surrogate <br />a,a,a-TFT <br />Mario D'Onofrio <br />Chemist <br />Amnt Spiked Amnt Rec. % Recovery QC Limit % <br />250 167 66.8 66-117 <br />Benzene <br />Toluene <br />Ethyl Benzene <br />Total Xylenes <br />ND µg/Kg <br />ND µg/Kg <br />ND Ag/Kg <br />ND µg/Kg <br />Amnt Spiked Amnt Rec. % Recovery QC Limit % <br />250 218 87.2 66-117 <br />Benzene <br />Toluene <br />Ethyl Benzene <br />Total Xylenes <br />ND µg/Kg <br />ND µg/Kg <br />ND µg/Kg <br />ND µg/Kg <br />Amnt Spiked Amnt Rec. % Recovery QC Limit % <br />250 201 80.4 66-117 <br />Certification # 1157 <br />Donna Keller <br />Laboratory Director/ <br />