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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (747) 5 <br /> 86 <br /> Analytical <br /> FAX(707)792-0342 <br /> • wwwsequoialabs.clabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P309139 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 10/16/03 19:28 <br /> BTEX by 8021B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-5(P309139-05)Water Sampled: 09/09/03 07:30 Received:09/09/03 10:20 <br /> Benzene ND 0.50 ug/l 1 3090325 09/16/03 09/16/03 EPA 8021B <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:a,a,a-Trifluorotoluene 104% 65-135 <br /> MW-6(P309139-06)Water Sampled: 09/09/03 06:50 Received:09/09/03 10:20 <br /> Benzene ND 0.50 ug/l 1 3090325 09/16/03 09/16/03 EPA 8021B <br /> Toluene ND 0.50 " " " " " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:a,a,a-Triuorotoluene 103% 65-135 " <br /> MW-7(P309139-07)Water Sampled:09/09/03 02:48 Received: 09/09/03 10:20 <br /> benzene ND 0.50 ugli l 3090325 09/16/03 09/16/03 EPA 8021 B <br /> oluene ND 0.50 <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:a,a,a-Trifluorotoluene 97% 65435 " <br /> MW-8(P309139-08)Water Sampled: 09/09/03 03:53 Received:09/09/03 10:20 <br /> Benzene 980 1.0 ug/I 2 3090325 09/16/03 09/16/03 EPA 8021B <br /> Toluene ND 1.0 " <br /> Ethylbenzene ND 1.0 " <br /> Xylenes(total) ND 1.0 " <br /> Surrogate:a,a,a-Trifluorotoluene 108% 65-135 " <br /> The results in this report apply to the samples analyzed in accordance with the chain of <br /> Sequoia Analytical-Petaluma P PPY P Y <br /> custody document. Unless otherwise stpted,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> i <br /> Page 8 of 38 <br />