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GeoAnalytical Laboratories, Inc. <br /> 1405 Kansas Avenue Phone (209) 572-0900 <br /> Modesto, CA 95351 FAX (209) 572-0916 <br /> QC REPORT <br /> Report# K036-09 Date: 2/11/99 <br /> Dates Analyzed: 2/9-2/10/99 <br /> Tuff Boy Trailers Method: 8020 <br /> 5151 E.Almond Wood Ave. <br /> Manteca,CA 95336 <br /> Samples Analyzed: K20468, K20469, K20470 <br /> Sample Spiked: K20428 <br /> Analyte Matrix Spike Matrix Spike Relative Blank <br /> %Recovery Duplicate % Percent <br /> Recovery Difference (%) <br /> Benzene 100.8 99.5 1.3 N D <br /> Toluene 98.4 98.2 0.2 ND <br /> Ethyl Benzene 101.6 99.8 1.7 ND <br /> Gasoline 102.9 99.6 3.2 ND <br /> Y i- S/L <br /> Chemist Certification # 1157 Laboratory Director <br />