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a— ) (71455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical FAX <br /> 07)792-1865 <br /> (747)792-0342 <br /> www sequolalabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/18/05 11 34 <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 /> ] <br /> Batch 4120569-EPA 5030B,waters/EPA 8015B-VOA <br /> Matrix Spike Dup(4120569-MSDI) Source P412423-06 prepared&Analyzed 12/30/04 <br /> Gasoline Range Organics(C4-C 12) 2990 50 ug/1 2750 68 103 67-101 2 20 HL <br /> Surrogate 4-Bromofluorobenzene 301 300 100 80-110 <br /> Batch 5010021 -EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(5010021-BLKI) Prepared 01/03/05 Analyzed 01/04/05 <br /> Gasoline Range Organics(C4-C 12) ND 100 ug/l <br /> Surrogate 4-Bromofluorobenzene 182 300 94 80-110 <br /> Laboratory Control Sample(5010021-BSI) Prepared 01/03/05 Analyzed 01/04/05 <br /> Gasoline Range Organics(C4-C 12) 2680 100 ugA 2750 97 67-101 <br /> Surrogate 4-Bromofluorobenzene 301 300 101 80-110 <br /> Matrix Spike(5010021-MSI) Source P412386-01 Prepared 01/03/05 Analyzed 01/04/05 <br /> Gasoline Range Organics(C4-C 12) 2750 100 ugA 2750 ND 100 67-101 <br /> ,Surrogate 4-Bromofluorobenzene 292 300 97 80-110 <br /> Matrix Spike Dup(5010021-MSDI) Source P412386-01 Prepared 01/03/05 Analyzed 01/04/05 <br /> Gasoline Range Organics(C4-C12) 2590 100 ugA 2750 ND 94 67-101 6 20 <br /> Surrogate 4-Bromofluorobenzene 292 300 97 80110 <br /> Batch 5010041 -EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(5010041-BLKI) Prepared&Analyzed 01/04/05 <br /> Gasoline Range Organics(C4-C12) ND 50 ugA <br /> Surrogate 4-Bromofluorobenzene 257 300 86 80-110 <br /> I <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 18 of 33 <br />