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§equoia 885 Jarvis Dr <br /> Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.se quoialabs.carn <br /> #traol'us Environmental lne. Project: ARCO#5469,Stockton,CA MLK0837 <br /> 3Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> mron Park CA,95682 Project Manager: Jay Johnson 12/23/02 10:37 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified,BTEX by EPA 8021E - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2L04004 -LPA 5030E IP/TJ <br /> Blank(2L04004-BLK1) Prepared&Analyzed: 12/04/02 <br /> Gasoline Range Organics(C6-C10) 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 8.08 10.0 80.8 55-142 <br /> Laboratory Control Sample(2L04004-BSI) Prepared&AnaIyzed: 12/04/02 <br /> Benzene 9.83 0.50 ug/l 10.0 98.3 68-140 <br /> Toluene 9.83 0.50 10.0 98.3 76-127 <br /> Ethylbenzene 9.36 0.50 10.0 93.6 77-130 <br /> Xylenes(total) 30.0 0.50 30.0 100 78-128 <br /> Surrogate:a,a,a-Triflvorotoluene 7.84 - 10.0 78.4_ 55-142 <br /> Laboratory Control Sample(2L.04004-BS2) Prepared&Analyzed: 12/04/02 <br /> Gasoline Range Organics(C6-C10) 273 50 ug/l 250 109 62-134 <br /> Surrogate:a,a,a-Tr�fluorotoluene 13.3 10.0 133 55-142 <br /> Matrix Spike (2L04004-MSI) Source:MLK0865-03 Prepared: 12/04/02 Analyzed: 12/05/02 <br /> Gasoline Range Organics(C6-CIO) 546 50 ug/l 550 ND 99.3 62-134 <br /> Benzene 9.99 0.50 6.60 ND 151 68-140 QM-07 <br /> Toluene 47.3 0.50 39.7 ND 119 76-127 <br /> Ethylbenzene 9.81 0.50 9.20 NTD 107 77-130 <br /> Xylenes(total) 50,7 0.50 46.1 ND 110 78-128 <br /> Surrogate:a,a,a-Triuorotoluene 10,3 10.0 103 55-141 <br /> Matrix Spike Du (2LO4004-MSDI) Source: AILK0865-03 Prepared: 12/04/02 Analyzed! 12/05/02 <br /> Gasoline Range Organics(C6-C10) 476 50 ug/l 550 ND 86.5 62-134 13.7 41 <br /> Benzene 8.73 0.50 6.60 ND 132 68-140 13.5 30 <br /> Toluene 41.9 0.50 39.7 ND 106 76-127 12,1 30 <br /> I <br /> Sia Analytical-Morgan Hill 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 8 of 13 <br />