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a— ) (71455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical FAX <br /> 07)792-1965 <br /> (767)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P409434 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/08/04 09 40 <br /> Purgeable Hydrocarbons by EPA 8015B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result I-unit Units Dilution Batch Prepared Analyzed Method Note <br /> NIW-1 (P409434-01)Water Sampled 09/23/04 11 45 Received 09/23/0413 15 <br /> Gasoline Range Organics(C4-C12) 1400 50 ug/l 1 4090730 09/29/04 09/19104 EPA 8015B-VOA <br /> Surrogate 4-Bromofluorobenzene 92% 804-110 " <br /> MW-2(P409434-02)Water Sampled 09/23/04 03 52 Received 09/23/04 13 15 <br /> Gasoline Range Organics(C4-C12) ND 50 USA 1 4090730 09/29/04 09/29/04 EPA 8015B-VOA <br /> Surrogate 4-Bromofluorobenzene 96% 804-110 " <br /> MW-3(P409434-03)Water Sampled 09/23/04 03 56 Received 09/23/04 13 15 <br /> Gasoline Range Organics(C4-C12) ND 50 ugll 1 4090730 09129/04 09/29/04 EPA 801513-VOA <br /> Surrogate 4-Bromofluorobenzene 86% 604-110 " <br /> MW-4(P409434-04)Water Sampled 09123/0404 18 Received 09/23/04 13 15 <br /> Gasoline Range Organics(C4-C12) 840 50 ugll 1 4090730 09/29/04 09/29/04 EPA 8015E-VOA PV <br /> Surrogate 4-Bromofluorobenzene doe-5 <br /> 4 16% 804-110 " <br /> AakW-5(P409434-05)Water Sampled 09!23104 04 28 Rec1eived 09/23/04 13 15 <br /> qW <br /> Gasoline Range Organics(C4-C 12) ND 50 up/l 1 4090730 09/29/04 09/29/04 EPA 8015B-VOA <br /> Surrogate 4-Bromofluorobenzene 92% 804-110 " <br /> /MW-6(P409434-06)Water Sampled 09/23/04 04 26 Received 09/23/04 13 15 <br /> Gasoline Range Organics(C4-C 12) ND 50 ugIl 1 4090730 09/29/04 09/29/04 EPA 80158-VOA <br /> Surrogate 4-Brotnofluorobenzene 94% 804-110 " <br /> MW-7(P409434-07)Water Sampled 09/23/04 04 24 Received 09/23/04 13 15 <br /> Gasoline Range Organics(C4-Cl2) ND 50 ug/l 1 4090758 09/30/04 09/30/04 EPA 801513-VOA <br /> Surrogate 4-Bromofluorobenzene 88% 804-110 <br /> Sequoia Analytical-Petaluma The results in 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 5 of 21 <br />