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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> ►► Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Caro-Sacramento Project Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <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 Nptes <br /> Batch 31204$7-EPA 5030B,waters <br /> Blank 3120487-BLKl Prepared&Ana] d 12/17/03 <br /> Gasoline Range Organics ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 171 300 90 65-135 <br /> Laboratory Control Sample 3120487-BS1 Prepared&Analyzed 12/17/03 <br /> Gasoline Range Organics 2200 50 ug/l 2750 80 65-135 <br /> Surrogate 4-Bromofluorobenzene 295 300 98 65-135 <br /> Matrix Spike 31204$7-MS1 Source P312285-01 Pre ared&Analyzed 12/17/03 <br /> Gasoline Range Organics 2180 50 ug/l 2750 30 78 65-135 <br /> Surrogate 4-Bromofluorobenzene 292 300 97 65-135 <br /> Matrix Spike Du (3120487-MSDI) Source P312285-01 Prepared&Analyzed 12/17/03 <br /> Gasoline Range Organics 2290 50 ug/l 2750 30 82 65-135 5 20 <br /> arrogate 4-Bromofluorobenzene 290 300 97 65-135 <br /> atch 3120523-EPA 5030B,waters <br /> Blank 3120523-BLK1 Prepared&Anal zed 12/18/03 <br /> Gasoline Range Organics ND 50 ugll <br /> Surrogate 4-Bromofluorobenzene 308 300 103 65-135 <br /> Laboratoa Control Sample 3120523-BSI) Prepared&Analyzed 12/18/03 <br /> Gasoline Range Organics 2380 50 ug/l 2750 87 65-135 <br /> Surrogate 4-Bromofluorobenzene 335 300 112 65-135 <br /> Matrix Spike(3120523-MS1) Source P312329-01 Prepared&Analyzed 12/18/03 <br /> Gasoline Range Organics 2360 50 ug/l 2750 45 84 65-135 <br /> Surrogate 4-Bromofluorobenzene 341 300 114 65-135 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 25 of 35 <br />