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,�D1455 McDowell Blvd,North Ste <br /> Sequoia Petaluma,CA 949544 <br /> 1�11.� �'t1C�� (707)792-1365 <br /> FAX 707 792-4342 <br /> wxtivsequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P305380 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/18/03 21:10 <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 3050703-EPA 5030,waters <br /> Blank(3050703-BLKI) Prepared&Analyzed:05/28/03 <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-Trifluorotoluene 334 300 111 65-135 <br /> Surrogate:4-Bromofluorobenzene 293 300 98 65-135 <br /> Laboratory Control Sample(3050703-BS1) Prepared&Analyzed:05/28/03 <br /> Gasoline Range Organics 2400 50 ug/1 2750 87 65-135 <br /> Benzene 34.7 0.50 40.0 87 65-135 <br /> Toluene 178 0.50 186 96 65-135 <br /> �hylbenzene 41.6 0.50 47.0 89 65-135 <br /> ylenes(total) 231 0.50 " 210 110 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 328 300 109 65-135 <br /> Surrogate:4-Bromofluorobenzene 312 300 104 65-135 <br /> Matrix Spike(3050703-MSI) Source:P305380-01 Prepared&Analyzed:05/28/03 <br /> Gasoline Range Organics 2350 50 ugll 2750 36 84 65-135 <br /> Benzene 34.4 0.50 40.0 ND 86 65-135 <br /> Toluene 177 0.50 186 0.43 95 65-135 <br /> Ethylbenzene 42.3 0.50 47.0 0.18 90 65-135 <br /> Xylenes(total) 233 0.50 210 0.49 111 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 323 300 108 65-135 <br /> Surrogate:4-Bromofluorobenzene 316 300 105 65-135 <br /> Matrix Spike Dup(3050703-MSDI) Source:P305380-01 Prepared&Analyzed:05/28/03 <br /> Gasoline Range Organics 2390 50 ug/I 2750 36 86 65-135 2 20 <br /> Benzene 35,4 0.50 40.0 ND 88 65-135 3 20 <br /> Toluene 183 0.50 186 0.43 98 65-135 3 20 <br /> Ethylbenzene 42.8 0.50 47.0 0.18 91 65-135 1 20 <br /> Xylenes(total) 237 0.50 210 0.49 113 65-135 2 20 <br /> Surrogate:a,a,a-Trifluorotoluene 326 300 109 65-135 <br /> Surrogate:4-Bromofluorobenzene 311 300 104 65-135 <br /> Sequoia <br /> quoia 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 25 of 36 <br />