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885 Jams Drive <br /> Sequoia MorganlGU CA 95037037 <br /> a— ) (408)776-9600 <br /> Analytical FAX(408)782 6308 <br /> www seguoialabs com <br /> URS Corporation[Arcot) Project BP#11194,Tracy,CA N4M0211 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number N/P Reported <br /> Sacramento CA,95833 PrglectManager ]ef1'Brooks 08/25/04 13 04 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Morgan Hili <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4H12022-EPA 5030B Modified <br /> Laboratory Control Sample Dup(4H12022-BSD2) Prepared 08/12/04 Analyzed 08/13/04 <br /> Benzene 551 0 50 ug/i 640 86 69-124 4 20 <br /> Ethylbenzene 807 050 696 116 84-132 2 20 <br /> Methyl tert-butyl ether 890 050 992 90 63-137 2 20 <br /> Toluene 317 050 29 7 107 78-129 4 20 <br /> Xylenes(total) 392 050 337 116 83-137 2 20 <br /> Gasoline Range Organics(C4-C12) 397 50 440 90 70-124 0 3 20 <br /> Surrogate 1 2-Dichloroethane-d4 228 2 50 91 78-129 <br /> i <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed to accordance with the chain of <br /> . custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 16 <br />