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l Blvd,North Ste D <br /> Sequoia 1455Md7owPetal ma CA 949544 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P503073 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vemon P Elarth 03/16/05 14 19 <br /> Purgeable Hydrocarbons by EPA 8015B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Lima Units Dilution Batch Prepared Analyzed Method Now <br /> ATR-1 (P503073-01)Water Sampled 03/02/05 12 10 Received 03/03/05 10 35 <br /> Gasoline Range Organics(C4-C12) ND 50 ug/l 1 5030113 03/10/05 03/10/05 EPA 8015B-VOA <br /> Surrogate 4-Bromofluorobenzene 86% 80-110 " <br /> ATR-2(P503073-02)Water Sampled 03/02/05 13 45 Received 03/03/05 10 35 <br /> Gasoline Range Organics(C4-C12) ND 50 ug/l 1 5030113 03/10/05 03/10/05 EPA 80I5B-VOA <br /> Surrogate 4-Bromofluorobenzene 85% 80-110 " <br /> ATR-3(P503073-03)Water Sampled 03/02/05 14 50 Received 03/03/05 10 35 <br /> Gasoline Range Organics(C4-C12) ND 50 ug/l 1 5030113 03/10/05 03/10/05 EPA 8015B VOA <br /> Surrogate 4-Bromofluorobenzene 85% 80-110 " <br /> ATR-4(P503073-04)Water Sampled 03/02/05 12 30 Received 03/03/05 10 35 <br /> Gasoline Range Organics(C4-C12) ND 50 ug/1 I 5030113 03/10/05 03/10/05 EPA 8015B-VOA <br /> Surrogate 4-Bromgjluorobenzene 84% 80-110 <br /> IOATR-5(P503073-05)Water Sampled 03/02/05 15 00 Received 03/03/05 10 35 <br /> Gasoline Range Organics(C4-C12) ND 50 ugfl 1 5030113 03/10/05 03/10/05 EPA 8015B-VOA <br /> Surrogate 4-Bromofluorobenzene 84% 80-110 " <br /> ATR-6(P503073-06)Water Sampled 03/02/05 13 25 Received 03/03/05 10 35 <br /> Gasoline Range Organics(C4-C12) ND 50 ugfl 1 5030113 03/10/05 03/10/05 EPA 8015E-VOA <br /> Surrogate 4-Bromofluorobenzene 81 % 80-110 <br /> ATR-7(P503073-07)Water Sampled 03/02/05 11 50 Received 03/03/05 10 35 <br /> Gasoline Range Organics(C4-02) ND 50 ug/l l 5030113 03/10/05 03/10/05 EPA 8015B-VOA <br /> Surrogate 4-Bromofluorobenzene 81 % 80-110 11 ' " <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 we/weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 3 of 19 <br />