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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.con <br /> URS Corporation[I I Project: ARCO#548,Stockton,Ca MMC0693 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 04/07/03 14:18 <br /> Total Purgeable Hydrocarbons (C6-010)by EPA 8015B modified,BTEXM by EPA 8021B-Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPA <br /> Analyte Result Limit Units Level Result °/aREC Limits RPD Limit Notes <br /> Batch 3C25009-EPA 5030E[P/T] <br /> Blank 3C25009-BLKI Prepared&Analyzed.03/24/03 <br /> Gasoline Range Organics(C6-C10) ND 10 mg/ml Air <br /> Benzene ND 0.10 " <br /> Toluene ND 0.10 " <br /> Ethylbenzene ND 0.10 " <br /> Xylenes(total) ND 0.10 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Surrogate:a,a,a-Trifluorotoluene 1.96 2.00 98.0 56-134 <br /> Laboratory Control Sample(3C25009-BSI) Prepared&Analyzed:03/24/03 <br /> Benzene 2.19 0.10 mglm'Air 2.00 Ito 62-125 <br /> Toluene 2.19 0.10 2.00 110 68-121 <br /> methylbenzene 2.14 0.10 2.00 107 75-125 <br /> Xylenes(total) 6.67 0.10 6.00 111 76-121 <br /> Surrogate:a,a,a-Trifluorotoluene 1.$6 " 1.00 <br /> 93.0 56-134 <br /> Laboratory Controi Sample(3C25009-BS2) Prepared&Analyzed:03/24/03 <br /> Gasoline Range Organics(C6-CIO) 49.9 10 mg/m'Air 50.0 97.8 65-142 <br /> Surrogate:a,a,a-Trifluorotoluene 3.53 2.00 176 56-134 S-02 <br /> Matrix Spike(3C25009-MSI) Source:MMC0677-05REPrepared&Analyzed:_03/24/03 <br /> Gasoline Range Organics(C6-CIO) 97.5 10 mg/ml Air 110 ND 88.6 65-142 <br /> Benzene 1.98 0.10 1.36 ND 146 62-125 QM-07 <br /> Toluene 9.07 0.10 8.20 ND 111 68-121 <br /> Ethylbenzene 1.98 0.10 1.96 ND 101 75-125 <br /> Xylenes(total) 10.0 0.10 9.58 ND 104 76-121 <br /> Surrogate:a,a,a-Triuorotoluene 4.62 2.00 231 56-134 S-02 <br /> Matrix Spike Dup 3025009-MSD! Source:MMC0677-05REPreared&Ana] zed:03/24/03 <br /> Gasoline Range Organics(C6-CIO) 100 10 mg/ml Air 110 ND 90.9 65-I42 2.53 50 <br /> Benzene 2.05 0.10 " 1.36 ND 151 62-125 3.47 31 QM-07 <br /> equoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise slated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> 6 of 8 <br />