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i <br /> lvd,North Ste D <br /> 4D Sequoia 1455 McDow Petaluma,CA 94954 <br /> iW Analytical FAX(707)792-(707)792-01865 342342 <br /> . www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P404367 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0307 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/05/04 17 30 <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 4040725-EPA 5030,soils <br /> Blank(4040725-BLK1) Prepared&Analyzed 04/28/04 <br /> Gasoline Range Organics(C4-C12) ND 050 mg/kg <br /> Surrogate 4-Bromofluorobenzene 0 306 110 300 102 65-135 <br /> Laboratory Control Sample 54040725-BS1) Prepared&Analyzed 04/28/04 <br /> Gasoline Range Organics(C4-C12) 244 0 50 mg/kg 2 75 89 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 318 " 0 300 I 106 65-135 <br /> Matrix Spike(4040725-_M_S1) Source P404367-05 repaeed Analyzed 04/28/04 <br /> Gasoline Range Organics(C4-C12) 5 03 10 mg/kg 5 50 ND 91 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 287 rr 0 300 96 65-135 <br /> Matrix Spike Du (4040725-MSDl) Source P404367-05 Pre ared&Analyzed 04/28/04 <br /> Gasoline Range Organics(C4-C 12) 4 25 1 0 mg/kg 5 50 ND 77 65-135 17 20 <br /> rrogaie 4-Bromofluorobenzene 0 243 0 300 81 65-135 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> ofeustody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 7 of 12 <br />