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1455 McDoweA <br /> Sequoia Petaluma,CA 99954 Blvd,North Ste 4 <br /> 6) (707)792-0665 <br /> Analytical <br /> FAX 707 792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5450,Stockton,CA P311175 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36604 Reported: <br /> Sacramento CA,95833 Project Manages Vernon P.Elarth 11/21/03 16:39 <br /> Purgeable Hydrocarbons by EPA 8015B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3110388-EPA 5030,waters <br /> Blank(3110388-BLK1) Prepared&Analyzed: 11/18/03 <br /> Gasoline Range Organics ND 50 ug/1 <br /> Surrogate:4-Bromofluorobenzene 280 300 93 65-135 <br /> Laboratory Control Sample 3110388-BS1) Prepared&Analyzed: 11/18/03 <br /> Gasoline Range Organics 1970 50 ug/l 2750 72 65-135 <br /> Surrogate:4-Bromofluorobenzene 295 300 98 65-135 <br /> Matrix Spike(3110388-MS1) Source:P311170-01 Prepared&Analyzed: 1I/18/03 <br /> Gasoline Range Organics 1840 50 ug/l 2750 21 66 65-135 <br /> Surrogate:4-Bromofluorobenzene 286 300 95 65-135 <br /> Matrix Spike Du 3110388-MSD1 Source:P311170-01 Prepared&Analyzed: 11/]8/03 <br /> ,Gasoline Range Organics 1900 50 ugll 2750 21 68 65-135 3 20 <br /> Surrogate:4-Bromofluoro benzene 281 300 94 65-135 <br /> Batch 3110425-EPA 5030,waters <br /> Blank(3110425-BLK1) Prepared&Analyzed: 11/19/03 <br /> Gasoline Range Organics ND 50 ugll <br /> Surrogate:4-Bromofluorobenzene 194 300 98 65-135 <br /> Laboratory Control Sample 3110425-BS1 Pre ared&Analyzed: 11/19/03 <br /> Gasoline Range Organics 2570 50 ug/l 2750 93 65-135 <br /> Surrogate:4-Bromofluorobenzene 304 300 101 65-135 <br /> Matrix Spike(3110425-MSI) Source:P311175-03 Pre ared&Analyzed: 11/19/03 <br /> Gasoline Range Organics 2260 50 ug/l 2750 21 81 65-135 <br /> Surrogate:4-Bromofluorobenzene 188 300 96 65-135 <br /> Sequoia Analytical-Petaluma 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 /> Page 6 of 10 <br />