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Sequoia 1455 McDowell Blvd North Ste <br /> Petaluma CA 949544 <br /> (707)792 1865 <br /> Analytical FAX equoi 792 0342 <br /> coin www squoialabs coni <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P412386 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/11/05 08 02 <br /> Purgeable Hydrocarbons by EPA 8015B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %uREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4120569- EPA 50308,waters/EPA 8015B-VOA <br /> Matrix Spike Dup(4120569-MSD1) Source P412423-06 Prepared&Analyzed 12/30/04 <br /> Gasoline Range Organics(C4-C 12) 2890 50 ug/l 2750 68 103 67-101 2 20 HL <br /> Surrogate 4-Bromofluorobenzene 301 300 100 80-110 <br /> Batch 5010021 -EPA 50306,waters 1 EPA 801513-VOA <br /> Blank(5010021-BLK1) Prepared 01/03/05 Analyzed 01/04/05 <br /> Gasoline Range Organics(C4-C12) ND 100 ug/l <br /> I <br /> Surrogate 4-Bromofluorobenzene 282 300 94 80-110 <br /> i <br /> Laboratory Control Sample(5010021-BSI) Prepared 01/03/05 Analyzed 01/04/05 <br /> Gasoline Range Organics(C4-C 12) 2680 100 ug/1 2750 97 67-101 <br /> Surrogate 4-Bromofluorobenzene 302 300 101 80-110 <br /> Alk.trix Spike(5010021-MSI) Source P412386-01 Prepared 01/03/05 Analyzed 01/04/05 <br /> asolmc Range Organics(C4-C12) 2750 100 ug/l 2750 ND 100 67-101 <br /> Surrogate 4-Bromofluorobenzene 292 300 97 80-110 <br /> Matrix Spike Dup(5010021-MSD1) Source P412386-01 Prepared 01/03/05 Analyzed 01/04/05 <br /> Gasoline Range Organics(C4-C 12) 2590 100 ug/l 2750 ND 94 67-101 6 20 <br /> Surrogate 4-Bromofluorobenzene 292 " 300 97 80-110 <br /> Sequoia Analytical-Petaluma The 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 /> This analytical report must be reproduced in its entirety <br /> Page 11 of 15 <br />