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• <br /> a— ) 1455 McDow <br /> Sequoia Petaluma,CA 94454 <br /> ell Blvd North Ste 4 <br /> Analytical (70792 1853 <br /> FAX(707))792-0342 <br /> www sequoialabs coni <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P409398 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50265 Reported <br /> Sacramento CA,95833 Project Managet-Vernon P Elarth 10/05/04 15 26 <br /> Purgeable Hydrocarbons by EPA 8015B - Quality Control <br /> Sequoia Analytical - PetaIuma <br /> Reporting Spike Source %uREC RPD <br /> Analyte Result limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4100005-EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(4100005-BLKl) Prepared&Analyzed 10/01/04 <br /> Gasoline Range Organics(C4-C 12) ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 258 300 86 804-110 <br /> Laboratory Control Sample(4100005-BS1) Prepared&Analyzed 10/01/04 <br /> Gasoline Range Organics(C4-C12) 2030 50 ug/l 2750 74 67-101 <br /> ,Surrogate 4-Bromofluorobenzene 274 300 91 804-110 <br /> Matrix Spike(4100005-MSI) Source P409411-04 Prepared&Analyzed 10101104_ <br /> Gasoline Range Organics(C4-C12) 1920 50 ug/l 2750 ND 70 67-101 <br /> Surrogate 4-Bromofluorobenzene 266 300 89 804-110 <br /> Matrix Spike Dup(4100005-MSD1) Source P409411-04 Prepared_&Analyzed 10/01/04 <br /> olme Range Organics(C4-C12) 2000 50 ug/I 2750 ND 73 67-101 4 20 <br /> IW-9-le 4-Bromofluorobenzene 269 11300 90 804-110 <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 /> 0 This analytical report must he reproduced in its entirety <br /> Page 5 of 8 <br />