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vd North Ste D <br /> Sequoia 1455McDowPeta�uma CA 949544 <br /> 1� (707)792 1865 <br /> ' Analytical FAX(707)792 0342 <br /> www scquoialabs corn tl <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P409117 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 09/21/04 09 47 <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 %AEC Limits RPD Limit Notes <br /> Batch 4090299- EPA 5030B waters <br /> Blank(4090299-BLKI) Prepared&Analyzed 09/14/04 <br /> Gasoline Range Organics(C4-C12) ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 301 300 100 77-101 <br /> Laboratory Control Sample(4090299-BS1) Prepared&Analyzed 09/14/04 <br /> Gasoline Range Organics(C4-C12) 2510 50 ug/1 2750 91 67-101 <br /> Surrogate 4-Bromofluorobenzene 310 300 103 77-101 LH <br /> Matrix Spike(4090299-MSI) Source P409117-03 Prepared&Analyzed 09/14/04 <br /> Gasoline Range Organics(C4-C12) 182000 2500 ug/l 138000 62000 87 67-101 <br /> Surrogate 4-Bromofluorobenzene 311 300 104 77-101 LH <br /> Matrix Spike Dup(4090299-MSD1) Source P409117-03 Prepared&Analyzed 09/14/04 <br /> Ida line Range Organics(C4-C12) 177000 2500 ug/l 138000 62000 83 67-101 3 20 <br /> ogate 4-Bromofluorobenzene 305 300 102 77-101 LH <br /> Batch 4090339- EPA 5030B waters <br /> Blank(4090339-BLKI) Prepared&Analyzed 09/15/04 <br /> Gasoline Range Organics(C4-C12) ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 289 300 96 77-101 <br /> Laboratory Control Sample(4090339-BSI) Prepared&Analyzed 09/15/04 <br /> Gasoline Range Organics(C4-C12) 2540 50 ug/l 2750 92 67-101 <br /> Surrogate 4-Bromofluorobenzene 295 300 98 77-101 <br /> Matrix Spike(4090339-MSI) Source P409112-01 Prepared&Analyzed 09/15/04 <br /> Gasoline Range Organics(C4-C12) 2480 50 ug/l 2750 ND 90 67-101 <br /> Surrogate 4-Bromofluorobemene 301 " 300 100 77-101 <br /> uoia Analytical-Petaluma 1 he 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 15 <br />