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1455 McDowell Blvd,North Ste D <br /> J Sequoia Petahuna CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P309471 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 59 <br /> Total Petroleum Hydrocarbons as Gasoline by EPA 8015B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Luntz Units Level Result %REC Liths RPD Lunit Notes <br /> Batch 3100089-EPA 5030,waters <br /> Blank(3100089-BLKI) Prepared&Analyzed 10/04/03 <br /> Gasoline Range Organics ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 280 300 93 65-135 <br /> Laboratory Control Sample(3100089-BS1) Prepared&Analyzed 10/04/03 <br /> Gasoline Range Organics 2170 50 ug/1 2750 79 65-135 <br /> Surrogate 4-Bromofluorobenzene 300 300 100 65-135 <br /> Matrix Spike(3100089-MSI) Source P309471-09 Prepared&Analyzed 10/04/03 <br /> Gasoline Range Organics 2200 50 ug/l 2750 51 78 65-135 <br /> Surrogate 4 Bromofluorobenzene 289 300 96 65-135 <br /> Matrix Spike Dup(3100089-MSD1) Source P309471-09 Prepared&Analyzed 10/04/03 <br /> Gasoline Range Organics 2270 50 ugll 2750 51 81 65-135 3 20 <br /> Ourrogate 4-Bromofluorobenzene 199 300 100 65-135 <br /> Batch 3100097-EPA 5030,waters <br /> Blank(3100097-BLKI) Prepared&Analyzed 10/06/03 <br /> Gasoline Range Organics ND 50 ug/l <br /> Surrogate 4 Bromofluorobenzene 270 300 90 65-135 <br /> Laboratory Control Sample(3100097-BSI) Prepared&Analyzed 10/06/03 <br /> Gasoline Range Organics 2170 50 ug/l 2750 79 65-135 <br /> Surrogate 4-Bromofluorobenzene 187 300 96 65-135 <br /> Matrix Spike(3100097-MSI) Source P3.0_9471-17 Prepared&Analyzed 10/06/03 <br /> Gasoline Range Organics 2230 50 ug/l 2750 74 78 65-135 <br /> Surrogate 4 Bromofluorobenzene 291 300 97 65-135 <br /> Sequoia Analytical-Petaluma 7*e 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 /> 16 This analytical report must be reproduced in its entirety <br /> Page 21 of 30 <br />