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a— ) (4885 Jams Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> Analytical FAX <br /> 09)700 <br /> (408)78282 63 b308 <br /> www segnoralabs torr <br /> URS Corporation f 11 Project ARCO#2093,Tracy,CA <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO#2093,Tracy,CA Reported <br /> Sacramento CA,95833 Pro3ect Manager Vern Elarth 09/30/02 08 20 <br /> Volatile Organic Compounds by EPA Method 8260B- Quahty Control <br /> Sequoia Analytical- Morgan Mll <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2125007-EPA 5030B PIT <br /> LCS(2125007-BS1) Prepared&Analyzed 09/25/02 <br /> Methyl tert-butyl ether 990 050 ug/l 100 990 63-137 <br /> Surrogate 1 2-Dichloroethane-d4 5 77 500 115 78-129 <br /> LCS Du (2125007-BSDi) Prepared&Anal zed 09/25/02 <br /> Methyl tert-butyl ether 970 050 ug/l 100 97 0 63-137 2 04 13 <br /> Surrogate 12-Dichloroethane-d4 624 5 00 125 78-129 <br /> • <br /> I <br /> I <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in as entirety <br /> 12 of 13 <br />