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1455 McDowell Blvd,North Ste D <br /> J. <br /> Sequoia <br /> � �� • Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br />+' � www.sequoialahs.com <br /> URS Corp-Sacramento Project: Arco Site 6100,Tracy,CA P306337 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36619 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 07/02/03 16:43 <br /> t <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> i <br /> Reporting Spike Source %PEC RPD i <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3060635-EPA 5030,waters <br /> Blank(3060635-BLK1) Prepared&Analyzed:06/25/03 <br /> i .. Gas line Range Or <br /> anics ND 50 u ] <br /> _ <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 . 309 300 103 65-135 <br /> i <br /> Surrogate:4-Bromofluorobenzene 257 " 300 86 65-135 <br /> Laboratory Control Sample(3060635-BSI) Prepared&Analyzed:06/25/03 <br /> Gasoline Range Organics 2110 50 ug/I 2750 77 65-135 <br /> Benzene 38.2 0.50 33.5 114 65-135 <br /> Toluene 199 0,50 202 99 65-135 <br /> Q- ihylbenzene 45,8 0.50 47.5 96 65-135 <br /> - E <br /> ylenes(total) 222 0.50 240 92 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 323 -300 108. 65-135 <br /> Surrogate:4-Bromofluorobenzene 277 300 92 65-135` j <br /> j: Matrix Spike(3060635-MSI) Source:P306339-07 Prepared&Analyzed:06/25/_03 <br /> Gasoline Range Organics 2050 50 ug/1 2750 ND 75 65-135 ' <br /> Benzene 37.4 0.50 33.5 ND •1 l2 65-135 l <br /> Toluene 198 0.50. 202 0.18: 98 65-135 <br /> Ethylbenzene 45.7 0,50 47,5 ND 96 65135 <br />` Xylenes(total) 221 0.50 240 ND 92 65-135 <br /> f. r <br /> Surrogate:a,a,a-Trifluorotoluene 315 300 108 65-135 <br /> Surrogate:4-Bromofluorobenzene 274 300. 91 65-135 j <br /> Matrix Spike Dup(3060635-MSD/) Source:P306339-07 `Prepared&Analyzed:06/25/03 fi <br /> Gasoline Range Organics 2030 50 ugll 2750 ND 74 65-135 l ..20 <br /> Benzene 37.1 0.50 33:5 ND 111 65-135 0.8 20 <br /> Toluene 197 0.50 202 0.18 97. 65-135 0.5 20 <br /> Ethylbenzene 45.6 0.50 47.5 ND `96 65-135 0.2 20 <br /> Xylenes(total) 220 0.50 240 ND 92 , 65-135 0.5 20 <br /> Surrogate:a,a,a-Trinuormoluene 329 300 <'110 65-135 <br /> Surrogate:4-Bromofluorobenzene 273 300 91 65-135 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of 1 <br /> i 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 7 of 10 <br />