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l Blvd,Nortb Ste <br /> a Sequoia 1455 McDowPetaluma,CA 94954 <br /> 9 <br /> (707)792-1865 <br /> 4D— <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P403320 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number ]ntrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/05/04 11 06 <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 Limas RPD Limit Notes <br /> Batch 4030536-EPA 5030B,waters <br /> Blank(4030536-BLKI) Prepared&Analyzed 03/19/04 <br /> Gasoline Range Organics(C6-C10) ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 280 300 93 65-135 <br /> Laboratory Control Sample(4030536-BSI) Prepared&Analyzed 03/19/04 <br /> Gasoline Range Organics(C6-C10) 2110 50 ug/I 2750 77 65-135 <br /> Surrogate 4-Bromofluorobenzene 283 300 94 65-135 <br /> Matrix Spike(4030536-MS1) Source P403320-01 Prepared&Analyzed 03/19/04 <br /> Gasoline Range Organics(C6-C 10) 2100 50 ug/l 2750 18 76 65-135 <br /> Surrogate 4-Bromofluorobenzene 280 300 93 65-135 <br /> Matrix Spike Dup(4030536-MSD1) Source P403320-01 Prepared&Analyzed 03/19/04 <br /> Gasoline Range Organics(C6-C 10) 2050 50 ug/l 2750 18 74 65-135 2 20 <br /> 0agate 4-Bromofluorobenzene 287 300 96 65-135 <br /> Batch 4030627-EPA 503013,waters <br /> Blank(4030627-BLK1) Prepared&Analyzed 03/22/04 <br /> Gasoline Range Organics(C6-C10) ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 284 Ir300 95 65-135 <br /> Laboratory Control Sample(4030627-BSI) Prepared&Analyzed 03/22/04 <br /> Gasoline Range Organics(C6-C10) 2310 50 ug/l 2750 84 65-135 <br /> Surrogate 4-Bromofluorobenzene 299 300 100 65-135 <br /> Matrix Spike(4030627-MS1) Source P403261-04 Prepared&Analyzed 03/22/04 <br /> Gasoline Range Organics(C6-C10) 2300 50 ug/l 2750 13 83 65-135 <br /> Surrogate 4-Bromofluorobenzene 301 11300 100 65-135 <br /> quoia 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 16 <br />