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865 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)7769600 <br /> Analytical PAX(408)782-6308 <br /> www.seauoialabs.con <br /> URS Corporation[Il Project: ARCO#548,Stockton,Ca MMC0693 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#548,Stockton,CA Reported: <br /> I <br /> Sacramento CA,95833- Project Manager. Vern Elarth 04/07/03 14:18 <br /> Total Purgeable Hydrocarbons (C6-C10)by EPA 8015B modified,BTEXM by EPA 8021B-Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3C25009-EPA 5030B[PIT] <br /> Matrix Spike Dug(3C25009-MSDI) Source:MMC0677-05REPrepared&Analyzed:03/24/03 _ <br /> Toluene 9.57 0.10 mg/m'Air 8.20 ND 117 68-121 5.36 29 <br /> Ethylbeazene 2.24 0.10 1.96 ND 114 75-125 12.3 32 <br /> Xylenes(total) 11.3 0.10 9.58 ND 118 76-121 12.2 29 <br /> Surrogate:a,a,a-TriJluorotoluene 4.62 2.00 231 56-134 S-02 <br /> •Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> 7of8 <br />