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Sequoia 1455 McI?owP Blvd,North Ste <br /> Petaluma,CA 949544 <br /> iz_ Analytical FAX(707)792-1845 <br /> (707)7924342 <br /> www,scquoialabs.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 /> Total Petroleum Hydrocarbons as Gasoline 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 3090325-EPA 5030,waters <br /> Blank(3090325-BLKI) Prepared&Analyzed:09/16/03 <br /> Gasoline Range Organics ND 50 ugll <br /> Surrogate:4-Bromofluorobenzene 284 300 95 65-135 <br /> Laboratory Control Sample(3090325-BSI) Prepared&Analyzed:09/16/03 <br /> Gasoline Range Organics 2450 50 ug/l 2750 89 65-135 <br /> Surrogate:4-Bromofluorobenzene 296 300 99 65-135 <br /> Matrix Spike(3090325-MS1) Source:P309139-01 Prepared&Analyzed:09/16/03 <br /> Gasoline Range Organics 2530 50 ugll 2750 23 91 65-135 <br /> Surrogate:4-Bromofluorobenzene 299 300 100 65-135 <br /> Matrix Spike Dup(3090325-MSDI) Source:P309139-01 Prepared&Analyzed:09/16/03 <br /> _dMICasoline Range Organics 2560 50 ugll 2750 23 92 65-135 1 20 <br /> Rmowurrogate: 289 300 96 65-135 <br /> i <br /> I <br /> �equoia 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 23 of 38 <br />