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5� <br /> w <br /> Sequoia 1455 McDowell Blvd,Nom Ste D <br /> Petaluma,CA 94954 <br /> Analytical `7"792-1665 <br /> FAIL(707)792-0342 <br /> www sequomlabs co® <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P306252 <br /> 2870 Gateway Oaks Drive Stnte 300 Project Number- Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager- Vernon P Elarlh 06/27/03 17 13 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B <br /> Sequoia Analytical -Petaluma <br /> Repomng <br /> Hyl Result Linut Units Dilution Batch Prepared Analyzed Method Notes <br /> MS-313(P306252-16)Water Sampled-06/11/03 08.57 Received 06/12/0311 45 <br /> Gasoline Range Organics ND .50 ug/l 1 3060544 06/23/03 06/23/03 EPA <br /> BenzeneND 050 " ^ ^ ^ " 8015B/802]B <br /> Toluene ND 050 ^ <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 <br /> Surrogate aa a-Tri luorotoluene 102% 65-135 <br /> Surrogate 4-Bromofluorobenzene 99% 65-135 ^ " <br /> MW-1(P306252-17)Water Sampled-06/1.1/03 07:45 Received 06/12/03 11 45 <br /> Gasoline Range Organics ND 50 ug/1 1 3060544 06/23/03 06/23/03 EPA <br /> 8015B/8021B <br /> Benzene ND 050 <br /> Toluene ND 050 ^ ^ <br /> Ethylbenzene ND 050 <br /> Adkenes(total) ND 050 ^ " <br /> Tlrrogale a,a,a-Trtfluorotoluene 102% 65-135 <br /> Surrogate 4-Bromofluorobenzene 99% 65-135 <br /> MW-2(P306252-18)Water Sampled 06/11/03 11 10 Received-06/12/0311 45 <br /> Gasoline Range Organics ND 50 ug/1 1 3060383 06/17/03 06/17/03 EPA <br /> 8015B/8021B <br /> Benzene ND 050 ^ " <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 " ^ <br /> Surrogate aa a-Tri luorotoluene 103% 65-135 <br /> Surrogate 4-Bromofluorobenzene 98% 65-135 " <br /> I <br /> o <br /> uo1a Analytical-Petaluma The results to this report apply to the samples analyzed in 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 8 of 27 <br />