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885 Jarvis Dr <br /> Sequoia Mcgpn Hid,CA 95037 <br /> i p (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabsxorn <br /> tus Environmental Inc. Project: ARCO#5469, Stockton,CA MMA0406 <br /> 0 Cameron Park Dr.,Suite 550 Project Number: ARCO 45469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 02/11/03 14:07 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified,BTEX by EPA 8021B - 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 3BO4002-EPA 5030B IP/T] <br /> Blank(3B04002-BLK1) Prepared&Analyzed:02/04/03 <br /> Toluene ND 0.50 ug/l <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:a,a,a-Trifluorotoluene 9.01 10.0 90.1 55-142 <br /> Laboratory Control Sample(3B04002-BS1) Prepared&Analyzed: 02/04/03 <br /> Benzene 7.90 0.50 ug/1 10.0 79.0 68-140 <br /> Toluene 8.05 0.50 10,0 80.5 76-127 <br /> Ethylbenzene 9.02 0.50 10.0 90.2 77-130 <br /> Xylenes(total) 26.2 0.50 30.0 87.3 78-128 <br /> gate:a,a,a-Trifluorotoluene 9.40 10.0 94.0 55-142 <br /> Laboratory Control Sample(3B04002-BS2) Prepared&Analyzed: 02/04/03 <br /> Gasoline Range Organics(C6-C 10) 228 50 ug/l 250 91.2 62-134 <br /> Surrogate:a,a,a-Trifluorotoluene 9.31 10.0 93.1 55-142 <br /> I <br /> Laboratory Control Sample Dup(3B04002-BSD1) Prepared: 02/04/03 Analyzed:02/05/03 <br /> Benzene 8.50 0.50 ug/l 10.0 85.0 68-140 7.32 30 <br /> Toluene 8.67 0.50 10.0 86.7 76-127 7.42 30 <br /> Ethylbenzene 9.59 0.50 10.0 95.9 77-130 6.13 21 <br /> Xylenes(total) 28.0 0.50 30.0 93.3 78-128 6.64 21 <br /> Surrogate:a,a,a-Trifluorotoluene 10.5 10.0 105 55-142 <br /> Laboratory Control Sample Dup(3B04002-BSD2) Prepared:02/04/03 Analyzed: 02/05/03 _ <br /> Gasoline Range Organics(C6-C10) 225 50 ug/1 250 90.0 62-134 1.32 41 <br /> Surrogate:a,a,a-Trifluorotoluene 10.2 10.0 102 55-142 <br /> oia 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 /> 24 of 34 <br />