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1455 McDowell Blvd,North Ste D <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (707)792 1865 <br /> Analytical FAX(707)7920342 <br /> WWW sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95 83 3 Project Manager Vernon P Elarth 04/12/04 10 17 <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 Luna Notes <br /> Batch 4030398-EPA 5030B,waters <br /> Matrix Spike Dup(4030398-MSDI) Source P403201-13 Prepared&Analyzed 03/15/04 <br /> Gasoline Range Organics(C6-C10) 2210 50 ug/l 2750 31 79 65-135 09 20 <br /> Surrogate 4-BromoJluorobenzene 289 300 96 65-135 <br /> Batch 4030431 -EPA 5030B,waters <br /> Blank(4030431-BLKI) Prepared&Analyzed 03/16/04 <br /> Gasoline Range Organics(C6-C 10) ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 187 300 96 65-135 <br /> Laboratory Control Sample(4030431-BSI) Prepared&Analyzed 03/16/04 <br /> Gasoline Range Organics(C6-C10) 2490 50 ug/l 2750 91 65-135 <br /> Surrogate 4-Bromofluorobenzene 302 300 101 65-135 <br /> Atrix Spike(4030431-MSI) Source P403187-19 Prepared&Analyzed 03/16/04 <br /> IgIrfime Range Organics(C6-C10) 2460 50 ug/l 2750 23 89 65-135 <br /> Surrogate 4-Bromofluorobenzene 308 300 103 65-135 <br /> Matrix Spike Du (4030431-MSD!) Source P403187-19 Prepared&Analyzed 03/16/04 <br /> Gasoline Range Organics(C6-C10) 2350 50 ug/l 2750 23 85 65-135 5 20 <br /> Surrogate 4-Bromofluorobenzene 306 300 101 65-135 <br /> I <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 26 of 34 <br />