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1455 McDowell Blvd,North Ste D <br /> Se11I <br /> 01a Petaluma,C94454 <br /> (707)799 2-1865 <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> 97RS Corp-Sacramento Project: Arco Site 5450,Stockton,CA P304543 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36604 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 05/09/03 15:37 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B - 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 3050138-EPA 5030,waters <br /> Blank(3050138-BLK1) Prepared&Analyzed:05/06/03 <br /> Gasoline Range Organics ND 50 ugll <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:a,a,a-Trifluorotoluene 305 300 102 65-135 <br /> Surrogate:4-Bromofluorobenzene 307 300 102 65-135 <br /> Laboratory Control Sample(3050138-BSI) Prepared&Analyzed:05/06/03 <br /> Gasoline Range Organics 2150 50 ug/l 2750 78 65-135 <br /> Benzene 36.7 0.50 40.0 92 65-135 <br /> S <br /> uene 203 0.50 " 186 109 65-135 <br /> ylbenzene 42.9 0.50 47.0 91 65-135 <br /> Xylenes(total) 222 0.50 210 106 65-135 <br /> Surrogate:a,a,a-Triuorotoluene 318 300 106 65-135 <br /> Surrogate:4-Bromofluorobenzene 305 300 102 65-135 <br /> Matrix Spike(31150138-MSI) Source:P304543-01 Prepared&Analyzed:05/06/03 <br /> Gasoline Range Organics 2180 50 ugA 2750 32 78 65-135 <br /> Benzene 37.0 0.50 40.0 ND 92 65-135 <br /> Toluene 214 0.50 186 0.25 115 65-135 <br /> Ethylbenzene 45.0 0.50 47.0 ND 96 65-135 <br /> Xylenes(total) 232 0.50 210 0.45 110 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 331 300 110 65-135 <br /> Surrogate:4-Bromofluorobenzene 303 300 101 65-135 <br /> Matrix Spike Dup(3050138-MSDI) Source:P304543-01 Prepared&Analyzed:05/06/03 <br /> Gasoline Range Organics 2150 50 ug/l 2750 32 77 65-135 1 20 <br /> Benzene 35.9 0.50 40.0 ND 90 65-135 3 20 <br /> Toluene 210 0.50 186 0.25 113 65-135 2 20 <br /> Ethylbenzene 43.9 0.50 47.0 ND 93 65-135 2 20 <br /> Xylenes(total) 227 0.50 210 0.45 108 65-135 2 20 <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 6 of 9 <br />