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Sequoia <br /> 1455 McDowell Blvd,North Ste D <br /> ►7equola Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs coinom. <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P402409 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/02/04 10 16 <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 Luml Notes <br /> Batch 4020503-EPA 5030B,waters <br /> Blank(4020503-BLKI) Prepared&Analyzed 02/24/04 <br /> Gasoline Range Organics ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 298 300 99 65-135 <br /> Laboratory Control Sample(4020503-BS1) Prepared&Analyzed 02/24/04 <br /> Gasoline Range Organics 1950 50 ug/1 2750 71 65-135 <br /> Surrogate 4-Bromofluorobenzene 311 300 104 65-135 <br /> Matrix Spike(4020503-MSI) Source P402297-06 Prepared&Analyzed 02/24/04 <br /> Gasoline Range Organics 1830 50 ug/1 2750 20 66 65-135 <br /> Surrogate 4-Bromofluorobenzene 300 300 100 65-135 <br /> Matrix Spike Dup(4020503-MSD1) Source P402297-06 Prepared&Analyzed 02/24/04 <br /> Gasoline Range Organics 1880 50 ug/I 2750 20 68 65-135 3 20 <br /> arrogate 4-Bromofluorobenzene 306 300 102 65-135 <br /> Batch 4020504-EPA 503013,waters <br /> Blank(4020504-BLKI) Prepared&Analyzed 02/24/04 <br /> Gasoline Range Organics ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 293 300 98 65-135 <br /> Laboratog Control Sample(4020504-BSI) Prepared&Analyzed 02/24/04 <br /> Gasohne Range Organics 2060 50 ug/I 2750 75 65-135 <br /> Surrogate 4-Bromofluorobenzene 312 300 104 65-135 <br /> Matrix Spike(4020504-MS1) Source P402304-01 Prepared&Analyzed 02/24/04 <br /> Gasoline Range Organics 2090 50 ug/1 2750 14 75 65-135 <br /> Surrogate 4-Bromofluorobenzene 306 " 300 101 65-135 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to 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 14 of 18 <br />