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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.cotr <br /> URS Corporation 111 Project: ARCO#1548,Stockton,Ca MMC0693 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO 4548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 04/07/03 14:18 <br /> Total Purgeable Hydrocarbons(C6-C10)by EPA 8015B modified,BTEX by EPA 8021B-Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Soume %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3C25009-EPA 5030B PIT <br /> Blank 3C25009-BLKl Prepared&Analyzed;03/24/03 <br /> Gasoline Range Organics(C6-C10) ND 2.4 ppmv <br /> Benzene ND 0.031 " <br /> Toluene ND 0.027 " <br /> Ethylbenzene ND 0.023 " <br /> Xylenes(total) ND 0.023 " <br /> Methyl tert-butyl ether ND 0.14 " <br /> Surrogate:a,a,a-Tris luorotoluene 0.328 0.335 97.9 56-134 <br /> Laboratory Control Sample(3C25009-BSI) Prepared&Analyzed:03/24/03 <br /> Benzene 0.687 0.031 ppmv 0.627 110 62-125 <br /> Toluene 0.582 0.027 0.532 109 68-121 <br /> iEthylbenzene 0.494 0.023 0.462 107 75-125 <br /> Xylenes(total) 1.54 0.023 1.38 112 76-121 <br /> Surrogate:a,a,a-Trifluorotoluene 0.311 0.335 92.8 56-134 <br /> Laboratory Control Sample 3C25009-BS2 Prepared&Anal ed:03/24/03 <br /> Gasoline Range Organics(C&CIO) 13.9 2.4 ppmv 14.2 97.9 65-142 <br /> Surrogate:a,a,a-Trifluorotoluene 0.591 0.335 176 56-134 S-01 <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. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> 5 of 8 <br />