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C 1455 McDowell Blvd,North Ste <br /> Sequoia Petaluma, 94954 <br /> S <br /> n q (707)792-1865 <br /> FAX 42 <br /> mIW Analytical wwsequ7ialabs om <br /> www sequoialabs coin <br /> • <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P308085 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 34 <br /> Total Petroleum Hydrocarbons as Gasoline by EPA 8015B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result t_imit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3080218-EPA 5030,waters <br /> Blank(3080218-BLKI) Prepared&Analyzed 08/12/03 <br /> Gasoline Range Organics ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 284 300 95 65-135 <br /> Laboratory Control Sample(3080218-BSI) Prepared&Analyzed 08/12/03 <br /> Gasoline Range Organics 2460 50 ug/1 2750 89 65-135 <br /> Surrogate 4-Bromofluorobenzene 306 300 102 65-135 <br /> Matrix Spike(3080218-MSI) Source P308085-02 Prepared&Analyzed 08/12/03 <br /> Gasoline Range Organics 2440 50 ug/l 2750 ND 89 65-135 <br /> Surrogate 4-Bromofluorobenzene 302 300 101 65-135 <br /> Matrix Spike Du (3080218-MSD1) Source P308085-02 Prepared&Analyzed 08/12/03 <br /> Gasoline Range Organics 2350 50 ug/l 2750 ND 85 65-135 4 20 <br /> urrogate 4-Bromofluorobenzene 304 300 101 65-135 <br /> Batch 3080242-EPA 5030,waters <br /> Blank(3080242-BLK1) Prepared&Analyzed 08/13/03 <br /> Gasoline Range Organics ND 50 ug/1 <br /> Surrogate 4-Bromofluorobenzene 282 300 94 65-135 <br /> Laboratory Control Sample(3080242-BSI) Prepared&Analyzed 08/13/03 <br /> Gasoline Range Organics 2340 50 ug/l 2750 85 65-135 <br /> Surrogate 4-Bromofluorobenzene 304 300 101 65-135 <br /> Matrix Spike(3080242-MS1) Source P308226-01 Prepared&Analyzed 08/13/03 <br /> Gasoline Range Organics 2560 50 ug/l 2750 280 83 65-135 <br /> Surrogate 4-Bromofluorobenzene 306 300 102 65-135 <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 11 of 19 <br />