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• • 1455 McDowell Blvd,North Ste D <br /> / <br /> D (707)Sequoia Petaluma,CA 94954 <br /> 792-1865 <br /> iW Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 760,Lodi,CA P304288 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36622 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 04/25/03 17:11 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 801513/802113 - 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 3040377-EPA 5030,waters <br /> Blank(3040377-BLK1) Prepared&Analyzed:04/16/03 <br /> Gasoline Range Organics ND 50 ug/l <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-Tri,/luorotoluene 308 300 103 65-135 <br /> Surrogate:4-Bromofluorobenzene 274 300 91 65-135 <br /> Laboratory Control Sample(3040377-BSI) Prepared&Analyzed:04/16/03 <br /> Gasoline Range Organics 2680 50 ug/1 2750 97 65-135 <br /> Benzene 44.2 0.50 40.0 110 65-135 <br /> Toluene 211 0.50 186 113 65-135 <br /> Ethylbenzene 49.0 0.50 47.0 104 65-135 <br /> Xylenes(total) 228 0.50 210 109 65-135 <br /> Surrogate:a,a,a-Triuorotoluene 328 300 109 65-135 <br /> Surrogate:4-Bromofluorobenzene 279 300 93 65-135 <br /> Matrix Spike(3040377-MS1) Source:P304218-06 Prepared&Analyzed:04/16/03 <br /> Gasoline Range Organics 2560 50 ug/l 2750 29 92 65-135 <br /> Benzene 43.4 0.50 40.0 ND 108 65-135 <br /> Toluene 209 0.50 186 0.31 112 65-135 <br /> Ethylbenzene 48.1 0.50 47.0 0.20 102 65-135 <br /> Xylenes(total) 227 0.50 210 ND 108 65-135 <br /> Surrogate:a a,a-Trifluorotoluene 333 300 111 65-135 <br /> Surrogate:4-Bromofluorobenzene 275 300 92 65-135 <br /> Matrix Spike Dup(3040377-MSDI) Source:P304218-06 Prepared&Analyzed:04/16/03 <br /> Gasoline Range Organics 2580 50 ug/I 2750 29 93 65-135 0.8 20 <br /> Benzene 45.1 0.50 40.0 ND 113 65-135 4 20 <br /> Toluene 218 0.50 186 0.31 117 65-135 4 20 <br /> Ethylbenzene 50.7 0.50 47.0 0.20 107 65-135 5 20 <br /> Xylenes(total) 236 0.50 210 ND 112 65-135 4 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 5 of 8 <br />