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Sequoia 1455 McDowell Blvd North Ste <br /> 4D Petaluma CA 949544 <br /> (707)792 1965 <br /> Analytical FAX792 0342 <br /> ID IWwww sequoiequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P503196 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/25/05 17 38 <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 Notes <br /> Batch 5030199-EPA 503013,waters I EPA 8015B-VOA <br /> Blank(5030199-BLKI) Prepared&Analyzed 03/18/05 <br /> Gasoline Range Organics(C4-C12) ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 271 300 90 80-110 <br /> Laboratory Control Sample(5030199-BSI) Prepared&Analyzed 03/18/05 <br /> Gasoline Range Organics(C4-C 12) 2420 50 ug/l 2750 88 609-120 <br /> Surrogate 4-Bromofluorobenzene 289 300 96 80-110 <br /> Matrix Spike(5030199-MS1) Source P503146-01 Prepared&Analyzed 03/18/05 <br /> Gasoline Range Organics(C4-C 12) 2440 50 ug/I 2750 ND 89 609-120 <br /> Surrogate 4-Bromof7uorobenzene 290 300 97 80-110 <br /> Matrix Spike Dup(5030199-MSDI) Source P503146-01 Prepared&Analyzed 03/18/05 <br /> AlElkasoline Range Organics(C4-C 12) 2320 50 ug/l 2750 ND 84 609-120 5 20 <br /> urrogale 4-Bromofluorobenzene 281 " 300 94 80-110 <br /> Batch 5030215-EPA 503013,waters 1 EPA 801513-VOA <br /> Blank(5030215-BLK1) Prepared&Analyzed 03/21/05 <br /> Gasoline Range Organics(C4-C 12) ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 269 300 90 80-110 <br /> Laboratory Control Sample(5030215-BSI) Prepared&Analyzed 03/21/05 <br /> Gasoline Range Organics(C4-C 12) 2850 50 ug/l 2750 104 609-120 <br /> Surrogate 4-Bromofluorobenzene 290 300 97 80-110 <br /> Matrix Spike(5030215-MSI) Source P503196-01 Prepared&Analyzed 03/21/05 <br /> Gasoline Range Organics(C4-C 12) 2830 50 ugll 2750 ND 103 609-120 <br /> Surrogate 4-Bromofluorobenzene 278 " 300 93 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 10 of 18 <br />